Hitachi CMP420V1A Pw1 Chassis Training

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CONTENTS... 2006 PW1 Chassis Plasma Television InformationMaterials Prepared by Alvie Rodgers C.E.T. (Chamblee, GA.)

February 2006 (ver a)

PW1 MODEL LIST

Model Chassis Remote P/N

42EDT41 PW1-A CLU-W900 HL02042EDT41A PW1-A CLU-W900 HL020CMP420V1 PW1-A CP-RD4 HL019

CMP420V1A PW1-A CP-RD4 HL019

CMP420V2 PW1-BA CP-RD4 HL019

CMP420V2A PW1-BA CP-RD4 HL019

Service Web Sitehttp://www.hitachiserviceusa.com

HITACHIPLASMA

TELEVISION


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PW1 BLANK PAGE USE FOR NOTES

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PW1 TABLE OF CONTENTS

Table of Contents Page 1

February 2006(ver a)Materials prepared by

Alvie Rodgers C.E.T.

TOPICS PAGE

SECTION (1) PRODUCT INFORMATION:

Product Pictures --------------------------------------------------------------------- 01-01

Remote Control ----------------------------------------------------------------------- 01-01

Rear A/V Inputs on the AV Unit -------------------------------------------------- 01-01 Product Description and Features ---------------------------------------------- 01-01

Product Dimensions ---------------------------------------------------------------- 01-03

SECTION (2) PWB LAYOUT AND PART NUMBERS:

Top Layer PWBs and their Part Numbers ------------------------------------ 02-01

Bottom Layer PWBs and their Part Numbers -------------------------------- 02-02

SECTION (3) TROUBLESHOOTING:GENERAL INFORMATION:

Plasma Panel and COF General Information -------------------------------- 03-01

Horizontal Address Control ------------------------------------------------------- 03-02 Flat Flexible Cables (FFC) -------------------------------------------------------- 03-02

Voltage Label Explanation -------------------------------------------------------- 03-03

Defect Terms Explanation -------------------------------------------------------- 03-03

X Drive PWB Information ---------------------------------------------------------- 03-05

Disconnecting COF Connector -------------------------------------------------- 03-05

Control PWB Description ---------------------------------------------------------- 03-05

Z-SUS PWB Description ---------------------------------------------------------- 03-06

Y-SUS PWB Description ---------------------------------------------------------- 03-07

IPM (Intelligent Power Supply) Description ----------------------------------- 03-09

NO PICTURE CHECKS: Checking connections between PWBs --------------------------------------- 03-10

Checking the Gas Port ------------------------------------------------------------- 03-10

Checking the Power Supply PWB ---------------------------------------------- 03-11

Checking the Control PWB ------------------------------------------------------ 03-12

Checking the Y-SUS and Y-Drive PWB --------------------------------------- 03-13

Checking the Intelligent Power Supply on the Y and X SUS PWB ----- 03-14

Checking the Z-SUS PWB and Flexible Cables ----------------------------- 03-15

VERTICAL BAR or LINE DEFECT CHECKS:

Checking the COF (Chip On Film) Connector ------------------------------ 03-16

Checking the Control PWB Signal Flow --------------------------------------- 03-17

Single Vertical Line Defect Check ---------------------------------------------- 03-18 Multiple Evenly Spaced Vertical Line Defect Check ------------------------ 03-19

HORIZONTAL BAR or LINE DEFECT CHECKS:

Checking the Flexible Cable Connectors ------------------------------------- 03-19

Y-Drive Upper or Lower PWB Scan IC Check ------------------------------- 03-20

Negative Picture (Mis-Discharge) Check -------------------------------------- 03-21


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PW1 TABLE OF CONTENTS


February 2006(ver a)Materials prepared by


TOPICSPAGE

SECTION (3) TROUBLESHOOTING (Continued):FLOW CHARTS:

Fast Check Flow Chart ------------------------------------------------------------ 03-22

Logical Judgment Flow Chart ---------------------------------------------------- 03-23 Wont Come On No Sound Flow Chart ------------------------------------ 03-24

No Picture LED Lighting Flow Chart ------------------------------------------- 03-25

Power PWB Dead No Picture/Sound Flow Chart -------------------------- 03-26

SECTION (4) ADJUSTMENTS:

Vs and Va Adjustments ------------------------------------------------------------ 04-01

Vsetup, -Vy and Vsc Adjustments ---------------------------------------------- 04-02

SECTION (5) THINGS YOU SHOULD KNOW:

See the index for this section after the Section 5 Divider. ---------------- 05-00


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PRODUCT

INFORMATION

SECTION 1


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PW1 CHASSIS PRODUCT INFORMATION

PAGE 01-01

42EDT41 Overview

Sculpted lines and striking styling highlight the Hitachi 42 enhanced definition plasma

television. Designed for a depth of about four inches for convenient installation on almost

any wall or with the convenient table top swivel stand.

The 42EDT41 features a bright detailed EDTV Monitor image and includes Hitachis mostadvanced video and graphics processor for great images from any source.

Convenience features include a wide variety of inputs including a DVI-HDTV (HDCP)

digital video input for compatibility with the latest digital video sources. Experience sharp,accurate images from Hitachis new plasma television.

Remote Control CLU-W900

p/n HL02042

Rear Inputs


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PAGE 01-02

Product Highlights

Sleek, slim design:

Less than 4 thin, more picture in less space.

Wide Viewing Angle:Plasma technology makes every seat in the house a clear, color accurate experience.

EDTV Monitor:Enjoy 480 progressive scan resolution an excellent match for DVD content

NTSC Tuner:A built-in TV tuner makes it easy to tune into analog terrestrial or cable broadcasts

(un-scrambled cable)

16:9 aspect ratio:For cinematic widescreen viewing.

New VirtualHD 1080p Digital Video Processor:

The 1080p digital video processor converts incoming non-480p signals to 1080p prior to the480 progressive display to deliver smooth, sharp and accurate images.

New Automatic 3:2 film Correction/26-point Motion Adaptive Interpolation:Ensures smooth, seamless display of both film and video-originated programming.

Multiple screen modes:

A wide range of options for viewing standard 4:3 programming on the 16:9 widescreen

display.

DVI-HDTV Digital Video Input:

This digital video input provides compatibility with the latest generation of HDTV Tunersand DVD players.

Anti-reflective shield:

Uses a special coating on the protective shield that minimizes ambient room light reflections.

ENERGY STAR Compliant


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PAGE 01-03

A B C D E F G H I J K L M

Inches 48-1/2 4/9/16 4 40-5/8 28 2/5/08 21-15/16 37-5/8 27-9/16 15-3/8 3/9/16 13/16 11/13/16

mm 1232 116 102 1032 711 67 557 956 700 391 90 21 300

Product Dimensions

42EDT41 42" Plasma EDTV


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PWB LAYOUT and

PART NUMBER

INFORMATION

SECTION 2


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PW1 CHASSIS PWB LAYOUT AND PART NUMBERS

PAGE 02-01

PWB LAYOUT TOP LAYER

1. Filter PWB p/n TS05423 4. Joint PWB p/n TS05428

2. Power PWB p/n HA01361 5. Formatter PWB p/n TS05429

3. Video Card p/n TS05267 (with Tuner) 6. Audio PWB p/n TS05263

3a. Tuner PWB p/n HC00494 (Not Shown Located Inside Video Card) can be replaced separately.


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PW1 CHASSIS PWB LAYOUT AND PART NUMBERS

PAGE 02-02

PWB LAYOUT BOTTOM LAYER

7. Y-Drive Upper p/n TS05672 11. Control (LVDS) PWB p/n TS05678

8. Y-Drive Lower p/n TS05673 12. X-Drive Right p/n TS05682

9. **Y-SUS PWB p/n TS05679 13. **Z-SUS PWB p/n TS05681

10. X-Drive Left p/n TS05683

** The Y-SUS and Z-SUS PWB must have Technical Services Authorization before ordering.


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TROUBLESHOOTING

SECTION 3


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PW1 CHASSISTROUBLESHOOTING SECTION

PAGE 03-01

PRELIMINARY INFORMATION:

The figure on the right shows a backview of the Panel.

VERTICAL ADDRESS:Vertical Addresses is controlled by the COF ca-

bles. COF stands for Chip On Film. This meansthat the Ribbon Cable has imbedded IC andresistors.

Note: There are 7 total COF cables controllingthe Vertical Addresses. They are broken down

into 2, 3, 2. The 2 on the left are controlled by the X-Drive Left PWB, the 3 in the middle are controlled by theControl (LVDS) PWB and the 2 on the right are controlled by the X-Drive Right PWB.The Figure below shows one of the COF cables. Note the chips, capacitors and resistors mounted on the flexible

ribbon cables.Also note there are 4 COF per cable. (4 X 7 = 24 COFs). 4 Per cable, 7 Cables.

COF

(Chip On Film Cable):

Supplies a waveform whichwas generated from the

Control PWB to the paneland selects a output pin that

is controlled by COF (ChipOn Film) when it will be on

or off.96 output pin per COF IC.

The higher the resolu-

tion, the less sparespace where an IC can

be placed on the PWBwithout using ICPACKAGE, so a

BARE IC is used em-bedded right on thecable.

Because IC is not soldered on PWB directly, soldering defect rate is decreased.

COF failure requires Panel replacement.

* Composition1. FPC + Heat /Sink FPC for COF must have a Low Specification decline with getting damp

2. CHIP resistor + CHIP Capacitor

3. BARE IC (STV7610A/WAF) + Gold and Aluminum Wire

4. EPOXY Molding


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PW1 CHASSIS TROUBLESHOOTING SECTION

PAGE 03-02

HORIZONTAL ADDRESS:Horizontal Address is controlled by 6 Printed Circuit Cables.

Supplies a driving waveform to PANEL by connecting a PAD electrode of PANEL with PCB(Y Drive and Z SUS).

There are two types of this for Y Drive PWB. One is single-sided, another isdouble-side. These have a pattern on it

For Z SUS PWB, there is no pattern , single-sided and Beta type

(all of copper surface).

PRELIMINARY INFORMATION (Continued):

CONNECTIONS BETWEEN PWBs:

FFC (Flat Flexible Cable):

For connecting a Logic signal between PWBs. The one shown here is P101 from the Control PWB to the Y SUSPWB.

There is 0.5mm pitch, 50 pin type and

1mm pitch , 30 pin type.


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PAGE 03-03

PANEL VOLTAGE LABLE:

Voltage Label Showing Vs and Va VoltagesSee Adjustment Section for adjustment procedure.

PRELIMINARY INFORMATION (Continued):

UNDERSTANDING DEFECT TERMS:The descriptions below all indicate the particular section which is involved in the abnormality being displayed.

Understand that if these lines were only a single pixel in width, then the Panel itself is defective. If the failure isbeing generated by a PWB and/or a connector, then the line will be at least 8 pixels wide.

PANEL VOLTAGE LABLE:Voltage Label Showing Vsetup, -Vy and Vsc VoltagesSee Adjustment Section for adjustment procedure.

Address open (line off)Vertical Influence from the Control, X-Drive Left and Right PWBs and

COF.(Note: Defect Line shown is on the front Right, so the X-Drive LeftPWB would be involved).

Note: The Screen can be broken down into 7 Vertical Columns. (See the Bot-tom PWB layout). Each of the connectors from the Control, X-Drive Left andRight PWBs controls each column. Try to determine which area of the screen

is affected to determine the PWB involved. Also, if the COF is defective, thepanel is defective and can not be repaired.

Address short (line on)Vertical Influence from the Control, X-Drive Left and Right PWBs and

COF.(Note: Defect Line shown is on the front Right, so the X-Drive Left PWB

would be involved).Note: The Screen can be broken down into 7 Vertical Columns. (See the Bot-

tom PWB layout). Each of the connectors from the Control, X-Drive Left andRight PWBs controls each column. Try to determine which area of the screenis affected to determine the PWB involved. Also, if the COF is defective, the

panel is defective and can not be repaired.


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PAGE 03-04

UNDERSTANDING DEFECT TERMS (Continued):

SUS short (line on)Horizontal Sustain Influence for Z and Y SUS PWBs, Y Drive Upper

and Y Drive Lower PWBs.(Note: Defect Line shown is on the bottom, so the back X-Drive Left PWBwould be involved or the Z-SUS output from the bottom connector).

Note: The Screen can be broken down into 8 Horizontal Rows.(See the Bottom PWB layout) from the Drive PWBs (4 from Upper Drive

PWB and 4 from Lower Drive PWB) and 2 Rows from the Z-SUS PWB(Top and Bottom). Each of the connectors from the Control, X-Drive Leftand Right PWBs controls each column. Try to determine which area of the

screen is affected to determine the PWB involved.

SUS open (line off)

Horizontal Sustain Influence for Z and Y SUS PWBs, Y Drive Upper

and Y Drive Lower PWBs.(Note: Defect Line shown is on the bottom, so the back X-Drive Left PWBwould be involved or the Z-SUS output from the bottom connector).

Note: The Screen can be broken down into 8 Horizontal Rows.

(See the Bottom PWB layout) from the Drive PWBs (4 from Upper DrivePWB and 4 from Lower Drive PWB) and 2 Rows from the Z-SUS PWB

(Top and Bottom). Each of the connectors from the Control, X-Drive Leftand Right PWBs controls each column. Try to determine which area of thescreen is affected to determine the PWB involved.


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PAGE 03-05

X DRIVE LEFT AND RIGHT PWB INFORMATION:

Each X Drive PWB Receives LOGIC signals from CONTROL PWB and makes ADDRESS PULSE (generatesAddress discharge) by ON/OFF operation, and supplies this waveform to COF (data) "Chip On Film".

COF Connector Separation:

CONTROL PWB:This picture shows the Control PWB and its 3 connections at the bottom to the COF connectors. Creates signal

processing (Contour noise, reduction ISM,..) by an order of many FETs turning on/off for each DRIVER.

Controls R, G, B (each 8 bit outputs, then parallel split).* Uses 3.3V / 5V (2 kinds of power regulators on board ).


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42EDT41 TROUBLESHOOTING SECTION

PAGE 03-06

CONTROL PWB:

This is a blow up of the Left side of the Control PWB showing the 3.3V and 2.5V Regulators.

Z-SUS PWB INFORMATION:The Z SUS PWB Generates SUSTAIN and ERASE PULSES that generates SUSTAIN discharge in the panel byreceiving LOGIC signal from CONTROL PWB. This waveform is supplied to panel through FPC (Z) (Flexible

Printed Circuit). These signals are composed with Intelligent Power Module, FET, DIODE, electrolytic capacitor

and Energy Recovery coil.


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PAGE 03-07

Z-SUS PWB INFORMATION Continued:

FPC (Flexible Printed Cable) Connector Removal:

Y-SUS PWB INFORMATION p/n TS05679:Generates SUSTAIN, RESET waveform, Vsc (SCAN) voltage and supplies it to the Y DRIVER PWB.Waveform compiled by IPM, DIODE, electrolytic capacitor, FET.


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PAGE 03-08

Y-SUS PWB INFORMATION Continued: Upper Left Hand Corner of PWBBelow is a picture of the Y-SUS PWB. The DC to DC converter area is shown close up. The DC to DCconverters are responsible for generating V-Setup, -Vy and Vsc.Using the Voltage Label, (see Figure 2 below) to determine the values for V-Setup, -Vy and Vsc.

Note that each Panel will have it's own values for these voltages.

For Ground use either Chassis ground or the Left Side of R31. TP for Vsc adjustment is R30 (Right Side and Gnd). Adjustment control VR5.

TP for -Vy adjustment is R31 (Right Side and Gnd). Adjustment control VR6.

TP for Vsetup adjustment is R27 (Left Side and Gnd). Adjustment control VR4.

NOTE: For Vsetup (R27) place the unit into "WHITE WIPE" first or the voltage on the label can not be obtained.

R30VSC Test Point

R31-Vy Test Point

R27VSetup Test Point

Ground

VR5Vsc Adj

VR4VSetup Adj

VR6-Vy Adj

Figure 2


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PAGE 03-09

Y and Z-SUS PWB INFORMATION Continued:

IPM (Intelligent Power Module):

Composition:HEATSINK, CAPACITOR DIODE, LINEAR IC, RESISTOR, TRANSISTOR,

FETs.Description:IPM is on the Z SUS PWB and Y SUS PWB and generates Sustain waveform.Sustainer : Supplies a square wave to panel to make video.

SET_UP deals with the Writing process to the Plasma cells.SET_DN deals with the Discharge process of the Plasma cells.

SET_UP

SET_DN


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PAGE 03-010

NO DISPLAY, CHECKING THE CONNECTORS:

Visually check each section with following method if there is problem, replace or repair that part. If not go to the

next Check.

Confirm every Connector (POWER SUPPLY, Y-SUS, CONTROL, Z-SUS, Y-DRIVE LEFT and RIGHT)

A Module may not function normal caused by abnormal or no connection. In such a case, the PWB can

not send Signal and/or Power.

Also a bad-connection for a long time may cause a specific PWB failure.

GAS PORT (Vacuum Port) CHECK:

Confirm exhausting Tip integrity and see if it may be Cracked with naked eye. This will check vacuum state. If

there is problem replace the module .

In case of vacuum breakdown, module makes a shaking noise because of inside gas ventilation. (there may

be a small crack which could not see with naked eyes. And this noise is different from Capacitor noise. )

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PW1 CHASSIS FAILURE AND MALFUNCTION CHECK

PAGE 03-11

POWER SUPPLY CHECK: Power PWB p/n HA013611. Check each part of POWER SUPPLY inside with naked eye. (Capacitor, FET a 3 legged IC, resistor)2. Check Output voltage which is converted from AC to DC.

Check voltage ( Va, Vs, 30V, 12V, 10V, 5V, 3.3V )

See Adjustment locations for Vs and Va in the Adjustment Section.

3. When POWER SUPPLY Protection occurs, check for Shorts between Y-SUS and Z-SUS PWBs and on anyDC output voltage.

CN63 Connector

Pin 1 (+5V)

Pin 3 (+3.3V)

CNPPS Connector

Pin 1 (+30V)

Pin 4 (+5V)

Pin 8 (+12V)

Pin 12 (+10V)


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PAGE 03-12

Figure 3Lower Bottom

Left Hand Side of PWB

CONTROL (LVDS) PWB CHECK: Control (LVDS) PWB p/n TS05678

1. Confirm LED D17 (flashing). See Figure 4 below.2. If not CHECK OSC X1 output. See Figure 4 below.

3. Check CTRL input voltage (CONNECTOR P300).

See Figure 1 to the right.

4. CHECK 3.3V, 5V,15V AND Va ON P701 AND P702.

See Figure 2 & 3 below

Figure 1Top Left Hand Side of PWB

Figure 4

Top Left Hand Side of PWB

Figure 2Lower Bottom

Right Hand Side of PWB

KNOWN FAILURE AND FIXES:One leg of the Crystal X1 has been found to

be broken solder connection. D17 would notblink. No Picture results. IC11 has been foundto be defective. The condition of the set is

"inoperative" won't come on.


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PAGE 03-13

Y-SUS PWB CHECK: Y-SUS PWB p/n TS056791. Check FUSE [FS1(5v) ,FS2(Vs)].2. Check voltages (Vsetup, -Vy, Vscw)

See Adjustment for Vsetup, -Vy and Vsc in the Adjustment Section.

3. Check whether output voltages agrees with voltage that is represented on the panel attached label.

4. Check using DIODE mode on meter, between GND and Y SUS output. [SUSUP(OC2) SUSDN(OC1)]on the back of the PWB. (See Next Page for Bottom View)

forward=0.4

reverse=OVERLOAD.

Vsc VR5 -Vy VR6 Vsetup VR4 FS2T2.0 AH 250V

Set_dn VR2

Set_up VR1

FS110A 125V

Y-SUS to Y-DRIVE CHECK: Y-Drive Upper p/n TS05672, Y-Drive Lower p/n TS05673Check whether output voltages agrees with voltage that represented in panel voltage label.

Check using the diode check mode on the DMM (Digital Multi Meter), the value between GND and Y-SUS out-put.


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PAGE 03-14

Y-SUS and Z-SUS PWB IPM (Intelligent Power Module) CHECK:Use the DIODE CHECK on the DMM (Digital Multi Meter) for

these test and checks.These are Static Checks, no power applied to PWB.See picture below for Test Points on the Back Side of IPM oneach SUS PWB.

FORWARD TEST:

1 GND (lead) to SUS-out (lead) 0.38V

2 SUS-out (lead) to VS (lead) 0.38V

3 ER-DN (lead) to ER-COM (lead) 0.48V

4 ER-COM (lead) to ER-UP (lead) 0.48V

When each 4 TEST Diode value is over 0.4V the test

is OK.REVERSE TEST:

1 GND (lead) , SUS-out (lead)

2 SUS-out (lead), VS (lead)

3 ER-DN (lead), ER-COM (lead)

4 ER-COM (lead), ER-UP (lead)

When each 4 nodes TEST Diode value is infinity he

test is OK.NOTE: Specially, the value of ER-UP, COM, DN on the Y and ZSUS boards, all of them should be checked. But be aware that the

terminal of VS, SUS-out, GND, after check one of IPM becauseit is parallel.

If no problems, check 15V using Diode Check mode on

DVM (Y-SUS and Z-SUS PWB) with GND,

Forward value 0.3V

Reverse value infinite if theres no problem with

PWB.


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PAGE 03-15

Z-SUS PWB FUSE CHECK: Z-SUS PWB p/n TS056811. Check the FUSES.2. Check input voltages. (Va, Vs, 5V,15V)3. Check FPC (Flexible Printed Cable) output diode value using diode check mode on the

DMM (Digital Multi Meter).

Z-SUS FPC (Flexible Printed Circuit) CABLE CHECK:1. Check FPC (Flexible Printed Cable) output diode value using diode check mode on the

DMM (Digital Multi Meter).

POWER PROTECTION CHECK: Power PWB p/n HA01361It is considered power protection when the power is shut off automatically within 2~3 min. from power on.Power protection function protects the boards when a short occurs in circuits related to the PDP module or if

there is a power problem. If using the checks indicated previously for shorts or loads can not be determined, re-place the Power Supply PWB.


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PAGE 03-16

VERTICAL DEFECT (ALSO CALLED VERTICAL BAR DEFECT) CHECKS:Check each section with following method if there is problem, replace or repair that part.If not go to the next section.

CONNECTOR:

Check COF (Chip On Film) connector. If not connected well, it will Make a bar defect .If completely disconnected, entire column blanks out.

CHECKING OF COF (Chip On Film) CONNECTOR:Confirm whether COF was torn. And then check input of COF resistor and IC.

COF (CHIP ON FILM) CONNECTOR RESISTOR CHECK:Failure of this resistor will cause Vertical Bar Defect.

Check across the resistor with a Digital Multi Meter (DMM) . If the resistor is normal, the resistor value will be10.2 ~ 10.8 . But if not, the value will be 0 or infinity.


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PAGE 03-17

CHECKING ADDRESS COF INPUT OF RESISTOR AND IC:IC input checking Inside of ICThere are 4 diodes each which are separated into 2 series, (input 2, output 2).*How to check:

1. Connect the DMM (-) lead to the right terminal of condenser (GND) and the DMM (+) lead to the rightterminal of the IC.

Normal value 0.66 (see fig.1)

2. Connect the DMM (-) lead to the Output terminal of resistor and the DMM (+) lead to the right terminal

of the IC.

Normal value 0.73 (see fig.2)

CONTROL PWB SIGNAL FLOW: Control (LVDS) PWB p/n TS05678The CONTROL PWB supplies video signal to COF. So if there is a bar defect on screen, it may be the ControlPWB problem.

Flow of Address Signal from the Control PWB MCM to COF (Chip On Film).In this figure, we can easily suppose what will be appeared on screen when a specific part failed.

This picture showsthe bottom center

portion of the Con-trol PWB. IC1 is theMain driver chip re-

sponsible for deliv-ering the Signal in-

formation to the Yand Z SUS PWB for

horizontal drive sig-nals and to the Ad-

dress Drive PWBsfor Vertical drive

signals.This pictures showthe signal path to the

bottom center COFconnector.


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PAGE 03-18

CHECKING ADDRESS COF INPUT OF RESISTOR AND IC (Continued):This picture depicts the Circuit Diagram related to Address Drive through COF. (Vertical Address). By analyst ofthe circuit, it can be seen that a Single Vertical Line fault can not be caused by the PWB, it has to be the fault ofthe COF or the Panel itself. A fault of the PWB will cause multiple vertical line failures due to the fact that the

PWB delivers the signal in a form of digital words. So a problem from this PWB would create a Bar Defect andnot a single line defect.Refer back to the previous picture to see the components as they correspond to the drawing below. Notice too thatto each Array, IC1 uses 1 and 1/2 buffer outputs or 12 bit words. The COF (Chip On Film) are part of the Verti-

cal address ribbon connectors. Remember there are 4 COF per/ribbon connector and each COF controls 96 verti-cal address lines.

SINGLE VERTICAL LINE DEFECT CHECK:In case of 1 line open or short , check for foreign substances in or on the COF connector. First blow off foreign

substances with air. And then if the same line appears, replace the panel.

1 LINE OPEN OR SHORT:This phenomenon is due to COF IC inside short or adherence to part of the Film by a foreign substance or splash

and/or rear panel electrode problem. In this case, replace the panel.


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PAGE 03-19

LINE OPEN OR SHORT BUT THERE ARE SEVERAL LINES SEPARATED BY THE

SAME DISTANCE.This is a problem with the MCM (IC1) of Control PWB. The MCM can not be replaced separately. So replace the

Control PWB. Control (LVDS) PWB p/n TS05678

HORIZONTAL BAR DEFECT CHECK:Most horizontal defects can be repaired. However, in case of adherence of foreign material to part of the FPC

(Flexible Printed Circuit) and/or rear panel electrode defect or panel electrode open or short , replace the panel.

CONNECTOR CHECK:If the connector is loose and/or disconnected on Y-SUS PWB, Y-Drive PWB Upper or Lower and/or Z SUS

PWB, it can make a horizontal bar defect.This is because sustain voltage can not be supplied to panel. So check connectors (Y-SUS PWB, Y-Drive PWBUpper or Lower and/or Z SUS PWB) first.This figure shows a disconnected or loose connector (P1) on the Upper Y-Drive PWB. This would be the bottom

Flexible Printed Circuit cable bottom connector.

This figure shows a disconnected connector (P12) between the Upper and Lower Y-Drive PWB. Notice that thiskills the bottom half of the picture.


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PAGE 03-20

SCAN IC CHECK ON Y DRIVE PWB (Either Top or Bottom PWB):Y-Drive Upper (Top) p/n TS05672, Y-Drive Lower (Bottom) p/n TS05673

Check diode value of the right side part of output pin.Normal diode value. * It can be different from each IC Maker.

(If Panasonic IC is used the check = 1.035) +/-10%

(If TI IC is used the check = 0.6 ~ 0.7) +/-10%

Fig 2 Defect diode value= 0.018Fig 1 Normal (Panasonic IC) check

FPC (Flexible Printed Circuit Ribbon Cable) CHECK (Horizontal Bar Defect):In case of 1 horizontal 1 line defect, it is due to FPC or panel inside . The Z and Y SUS, Y Drive PWB can notcause a single horizontal line defect.


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PAGE 03-21

"Negative Picture", "Looks like Bad or Gassy CRT" or "Purity Problem".

FAILURE TO DISCHARGE DEFECT CHECK:

The Pictures below shows the symptom of the panel's Failure to Discharge.Note: The picture may be barely visible and become darker when the unit is left in this condition for a time.

CHECKING ORDER WHEN MIS-DISCHARGE OCCURS:

1. Confirm Y-SUS and Z-SUS cables are connected correctly.

Y-SUS PWB to Control PWB

Z-SUS PWB to Control PWB

Check Z-SUS 190V Fuse (May be open) if yes, see item 2.

2. Check Y-SUS PWB voltages (-Vy and Vscw) See Panel Label for Values.

Y-SUS PWB p/n TS05679

3. Check Y-DRV Upper and Lower PWB IC Failure. (See Scan IC Check).

Y-Drive Upper p/n TS05672, Y-Drive Lower p/n TS05673

4. Check Y-SUS and Z-SUS IPM (Intelligent Power Module)failure.

Y-SUS PWB p/n TS05679

Z-SUS PWB p/n TS05681

5. Replace Control (LVDS) PWB.

Control (LVDS) PWB p/n TS05678


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PAGE 03-22

Fast Check Flow Chart:


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PAGE 03-23

Logical Judgment Flow Chart:


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PAGE 03-24

PW1 CHASSIS FLOW CHART WON'T COME ON or NO SOUND


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PAGE 03-25

PW1 CHASSIS FLOW CHART NO PICTURE LED LIGHTING


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PAGE 03-26

PW1 CHASSIS FLOW CHART POWER BOARD DEAD. NO PICTURE. NO SOUND.


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ADJUSTMENTS

SECTION 4


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PW1 CHASSIS ADJUSTMENT SECTION

PAGE 04-01

ADJUSTING Vs and Va AND THEIR LOCATIONBelow is a picture of the Power Supply PWB. The Power Supply is responsible for generatingVs and Va voltages.

Use the Voltage Label, (see Figure 2) to determine the values for Vs and Va.Note that each Panel will have it's own values for these voltages.

TP for Va shown below. Adjustment control VR351.

TP for Vs shown below. Adjustment control VR551.

Figure 1 (Power Supply PWB and Vs and Va Test Points and Adjustment locations)

Figure 2 (Voltage Label)


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PW1 CHASSIS ADJUSTMENT SECTION

PAGE 04-02

Y-SUS PWB INFORMATION Continued: Upper Left Hand Corner of PWBBelow is a picture of the Y-SUS PWB. The DC to DC converter area is shown close up. The DC to DCconverters are responsible for generating V-Setup, -Vy and Vsc.Using the Voltage Label, (see Figure 2 below) to determine the values for V-Setup, -Vy and Vsc.

Note that each Panel will have it's own values for these voltages.

For Ground use either Chassis ground or the Left Side of R31. TP for Vsc adjustment is R30 (Right Side and Gnd). Adjustment control VR5.

TP for -Vy adjustment is R31 (Right Side and Gnd). Adjustment control VR6.

TP for Vsetup adjustment is R27 (Left Side and Gnd). Adjustment control VR4.

NOTE: For Vsetup (R27) place the unit into "WHITE WIPE" first or the voltage on the label can not be obtained.

R30VSC Test Point

R31-Vy Test Point

R27VSetup Test Point

Ground

VR5Vsc Adj

VR4VSetup Adj

VR6-Vy Adj

Figure 2 Voltage Label


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THINGS YOU

SHOULD KNOW

SECTION 5


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February 2006(ver 1)Materials prepared by


TOPICS PAGE

THINGS YOU SHOULD KNOW TABLE OF CONTENTS

SECTION (5) THINGS YOU SHOULD KNOW:

Understanding the Front LED Indicating Lamps ---------------------------- 05-01

Defective Y-SUS PWB Symptom and Fix ------------------------------------- 05-02

Unit Shuts Down after 10 to 20 Seconds of operation --------------------- 05-03

DVI Doesnt Work Fix -------------------------------------------------------------- 05-04

Lines or Bars in the Picture Explanation -------------------------------------- 05-04

New Z-SUS PWB is different that the older version ------------------------ 05-05


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PW1 CHASSIS THINGS YOU SHOULD KNOW

PAGE 05-01

Indicating lamp Power status Operating

Off Off When the main power switch is set to OFF.

Lights red Off (standby) When the main power switch is ON, and the OFF button on the

remote control or the SUB POWER button on the underside of thefront of the frame is OFF.

Lights green On When the main power switch is ON, and the ON button on the re-mote control or the SUB POWER button on the underside of thefront of the frame is ON.

Lights orange Off (Power Save) When the main power switch is ON, and the ON button on theremote control or the SUB POWER button on the underside of thefront of the frame is ON.However, the state in POWER SAVE mode

When Mode Display is set to ON, the input sig-nal is switched or when the RECALL button ispressed.

A guide is displayed for the input terminal and the hori-zontal and vertical sync frequency.

When the sync signal is no longer detected.

A guide displays No Sync.

Signal, and Power Save (for approx. 5 sec.)

When the condition continues where the sync signalcannot be detected, indicator lamp of power sourcechanges in orange and the mode switches to powersave mode.

When the input signal does not match themonitor specifications or is in an unstablestatus.

A guide displays Invalid Scan Freq.

(1) FRONT INDICATING LAMP

When the indicating lamp lights in orange or the message No Sync Signal, Power Save or Invalid ScanFreq. appears on the screen, there is something unusual about the status of reception.See "Signal Check" or Power Save Mode or Symptoms That Seemingly Appear to be Failures. in the

owner's guide.SIGNAL CHECK:Changes in the signal status are displayed on the screen as they arise.

Horizontal Yes No Yes No

Vertical Yes Yes No No

PC SignalActive

(Normal Display)Blank No Display

Operation Mode On Off

Indicating Lamp Lights Green Lights Orange

Power Consumption 310W

3W or Less (RGB1)

1W or Less (RGB2); 100V < / = AC < / = 120V

3W or Less (RGB2); 120V < / = AC < / = 220V

RGB Sync Signal

POWER SAVE MODE:When the RGB1, RGB2 input is selected When this unit is connected to a VESA DPMS computer, the Power Save (Off) mode can be set to be activatedautomatically when the computer is not being used to reduce power consumption by this unit.


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PAGE 05-02

(2) The below symptom was caused by a defective Y-SUS PWB p/n TS05679

(3) Symptom: Unit Shutsdown after 10~20 seconds. First Power On, 5 sec. later, the Plasma will click, 5

sec. later shutdown.

Found Va voltage loaded 350 ohms or less to ground.

First removed Fuse on the Z-SUS PWB, measure right side of fuse holder as

shown in the picture, load disappeared.


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PAGE 05-03

(3) Symptom: Unit Shutsdown after 10~20 seconds. First Power On, 5 sec. later, the Plasma will click, 5

sec. later shutdown. Continued...

Traced load out the P1 connector to the Control PWB.

Removed both connector on each side to unload Va. Load disappeared with left

side connector P1 lifted. Load remained with right side connector P2 lifted. Foundcenter connector P110 to Panel had the load. Lifted and load removed.

Bottom line, the Panel was defective with a shorted imbedded register on the ribbon

connector.


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PAGE 05-04

(4) DVI Doesn't Work

Please clean the DVI input contacts with Isopropyl Alcohol using a stiff thin brush.

Sometimes contaminants can cause poor connections on the DVI and/or HDMI inputs.

Cleaning these contacts will eliminate the problem.

(5) LINES or BARS IN THE PICTURE:Also see Troubleshooting Section related to Vertical Bar DefectThe descriptions below all indicate the particular section which is involved in the abnormality being displayed.

Understand that if these lines were only a single pixel in width, then the Panel itself is defective. If the failure isbeing generated by a PWB and/or a connector, then the line will be at least 8 pixels wide.

Address open (line off)Vertical Influence from the Control, X-DriveLeft and Right PWBs and COF.(Note: Defect Line shown is on thefront Right, so the X-Drive Left PWB would be involved).

Note: The Screen can be broken down into 7 Vertical Columns. (See the

Bottom PWB layout). Each of the connectors from the Control, X-Drive

Left and Right PWBs controls each column. Try to determine which areaof the screen is affected to determine the PWB involved. Also, if the COFis defective, the panel is defective and can not be repaired.

Address short (line on)Vertical Influence from the Control, X-DriveLeft and Right PWBs and COF.(Note: Defect Line shown is on the front Right, so the X-Drive Left PWBwould be involved).

Note: The Screen can be broken down into 7 Vertical Columns. (See theBottom PWB layout). Each of the connectors from the Control, X-DriveLeft and Right PWBs controls each column. Try to determine which area

of the screen is affected to determine the PWB involved. Also, if the COFis defective, the panel is defective and can not be repaired.

SUS short (line on)Horizontal Sustain Influence for Z and Y SUS

PWBs, Y Drive Upper and Y Drive Lower PWBs.(Note: Defect Line shown is on the bottom, so the back X-Drive LeftPWB would be involved or the Z-SUS output from the bottom connector).

Note: The Screen can be broken down into 8 Horizontal Rows. (See theBottom PWB layout) from the Drive PWBs (4 from Upper Drive PWB

and 4 from Lower Drive PWB) and 2 Rows from the Z-SUS PWB (Topand Bottom). Each of the connectors from the Control, X-Drive Left andRight PWBs controls each column. Try to determine which area of the

screen is affected to determine the PWB involved.

SUS open (line off)Horizontal Sustain Influence for Z and Y SUSPWBs, Y Drive Upper and Y Drive Lower PWBs.

(Note: Defect Line shown is on the bottom, so the back X-Drive LeftPWB would be involved or the Z-SUS output from the bottom connector).

Note: The Screen can be broken down into 8 Horizontal Rows. (See the

Bottom PWB layout) from the Drive PWBs (4 from Upper Drive PWBand 4 from Lower Drive PWB) and 2 Rows from the Z-SUS PWB (Topand Bottom). Each of the connectors from the Control, X-Drive Left and

Right PWBs controls each column. Try to determine which area of thescreen is affected to determine the PWB involved.


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PAGE 05-05

New Cable P/N6631Q20003C

(6) New Z-SUS PWB May be Different, requiring an new P3 Connector

When replacing the Z-SUS PWB, the P3 connector may be moved away from the P2 connector

as it was on the original PWB.

The New replacement PWB should come with a new P3 connector cable, but if it doesn't,

Replace the P3 Connector cable with the new one. P/N 6631Q20003C

The P3 Connector goes from the Z-SUS PWB to the X-Drive Right PWB. See PWB bottom

layer layout.


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PAGE 05-06

(7) SYMPTOM: Unit would power on but with No Picture. (Page 1 of 3)

The unit did have Sound

The Front Power LED was OnWhen the power button was pressed, the unit would power on like normal, however there was never a picture

produced. Close observation of the screen showed a very minor flash at start up.

NORMAL SET OPERATION:Power the unit up with Color Bar input, color turned off from generator.

First check the Vs +180 ~ +195V on the Y-SUS PWB. Check on the FS2 Fuse.

Note: Vs voltage should be the same as the voltage label.

On the Y-SUS PWB, Check the Right Hand Side of R30 for +105.5V. Left hand side should be -17.36V.The PWB layout is shown below for R30.

If OK Power Supply PWB is providing VS voltage.

If not OK, confirm VS from Power Supply PWB is getting to the Y-SUS PWB.See Power Supply

Check pagein troubleshooting section.

On the Y-SUS PWB, Check the Right Hand Side of R321 for -65.2V. Left hand side should be -16.32V. PWBlayout shown below for R321.

If OK Y-SUS PWB is generating -Vy.Check -Vy Voltage

Note: -Vy can vary dependant upon the Panel Label. Check Label for exact voltage to measure.

If not OK, defective Y-SUS PWB. -Vy voltage -70V ~ -80V generated by the Y-SUS PWB DC to

DC converter.


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PAGE 05-07



The Front Power LED was On

Check the Outputs of the Buffers on the Y-Drive PWB Upper and Lower PWB. (Arrows in the picture belowpoint to the group of connection test points. Any point will measure the same.

Normal should be (50.9V). This voltage will vary due to picture content and fluctuate 5V up or down.

If this voltage is extremely high and not fluctuating, (>85V) expect a defective Buffer on the underside of

the Y-Drive Upper and Lower PWBs or

A defective Y-SUS PWB

NOTE: A defective Buffer will make ALL output voltage test High and the JP test point high.

Unplug the connectors one by one from the Y-Drive PWB to the Panel. If the voltage returns to normal,

then the buffer feeding this connector is bad. Remember, there are 4 connectors for each Y-Drive PWB. 4for Upper and 4 for Lower.

If you only have a defective Buffer, when the right connector is unplugged, the other voltages will return tonormal, (50.9V) and the picture will return, but only the top or bottom half.

In this case you only need to replace the Y-Drive PWB with the defective buffer;

Y-Drive Upper PWB p/n TS05672

Y-Drive Lower PWB p/n TS05673

See PWB Layout for Location

Check the Test Point JP on the Y-Drive PWB

Upper and Lower PWB.

Normal should be (-16 with Color Bars

with color turned off as input signal) .

This varies due to picture content.

If this voltage is extremely high, (>85V)

and doesn't fluctuate, expect a defectiveBuffer on the underside of the Y-Drive

Upper and Lower PWBs or a DefectiveY-SUS PWB.


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PAGE 05-08

Here are the Upper and Lower Y-Drive PWBs.

Note there are 4 buffers on each PWB.Even here a burnt buffer can be seen.

If after removing all connectors to the Panel assembly from the Y-Drive boards, the voltages still remain incor-rect;

Remove the Y-Drive PWBs. Look at the Buffers underneath. You may find small burn marks on the buffer. Anyone of them on either Upper or Lower Y-Drive PWB. If the voltage check showed defective buffer or any one

buffer is found to be burnt, replace the following:

Warning: If a Burnt Buffer is found, the

Y-SUS PWB must be replaced along with theY-Drive PWB. Failure to do so, could damagethe new Y-Drive PWB when installed.

Y-SUS PWB p/n TS05679Y-Drive Upper PWB p/n TS05672Y-Drive Lower PWB p/n TS05673

See PWB Layout for Location

Not in every casewith the buffer showburn marks.



The Front Power LED was On


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Hitachi CMP420V1A Pw1 Chassis Training