LCD Laptop or Monitor

8/6/2019 LCD Laptop or Monitor

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Monitor: LCD Panel common failures

and how to handle

01-05-2009 |lqv77 | 91 responses

1 - Display of color die

Expression:

On the screen with one or more of the color does not change the brightness in all

circumstances. Method of inspection:

- You set up the entire screen black to detect the color of death in the form of "do

not turn off"- Set the all-white screen to detect the color of "not bright"

Here's how:- Right click on desktop / select Properties / select Desktop- In the Background choose [None]

- In Color: black and then select OK

Then the screen will be black, you look carefully on the screen, if we see a red dot

or green or white, etc. ... it is the mystery of death "is not off"

Some die of mystery "does not turn off the" creation of green, red on black

background
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Some die of mystery "not bright" to create the green, red on white background

Cause of death:- The cause of this phenomenon is due to death of the driver transistors of the

color on the screen, making the point that color does not change when the

brightness control signal.

Fix:- You can not fix the dead spots on the screen, manufacturers often have

decreased from 10 to 20% of the cost to the customer when the Monitor detectsthe screen is between 2 and 3 dead.

2 - horizontal or vertical line screen color

Expression:

On the screen with one or more lines have not changed color portrait or landscape

screen


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Along the lines of death screen

Death phenomena lines across the screen


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Check:

Phenomenon displayed on the screen in all circumstances, so you do not need to

check you to see.

Cause:

The cause of this phenomenon is due to break in from the IC drive circuits control

horizontal and vertical lines of the screen to screen.

The cause of the vertical line does not change color due to vascular rupture in the

IC Drive or off the screen


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Causes of horizontal lines do not change color due to vascular rupture in the IC

Drive or off the screen

Fix:

- If fault circuit Panel LCD panels, you can not be joined- If the fault circuit immediately after the bus, the IC Drive is extremely complex

because of very fine circuit line

3 - Display lost part image

Expression: * Screen lost a vertical screen image


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Screen is lost along a screen image

Lost part of the screen image across the screen


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Cause:

Phenomenon is usually caused by damage control IC Drive along the road and

horizontal screen

Broken vertical line driver IC will lead to loss of a portion along the image

screen

Broken horizontal driver IC will lead to a loss of image across the screen

Fix:

* In this case, the only remedy is that you clean feet from the circuit Connect

LVDS interface with the controller IC Drive along the roads and crossroads of thescreen.


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* Replace broken lights or replacing the LCD

- When replacing the lamp, you need to replace the LVDS circuit is usually

accompanied by vessels under the lights.- You need to replace a tube on the model of the machine, you can hardly replace

the tube like CRT monitors because it also relates to the size and position signals

from the legs to Scaling circuits, we have approximately 12 to 24 feet Digitalcolor signal for the three color, four-pin control signals, power supply pin VDD

and a few feet Mass

4 - LCD screen broken plate

Expression:

A portion of the screen is bright white or color is not changed, the other stillimage.

A corner of the screen is broken

Cause:- Often caused by collision, or to transport or be spilled on the table from the

ground.

- One reason that caused by the worker because you remove the cover, use ascrewdriver can trust and breaking lamps.

Fix:

- The lamp is broken you can just change the lights or replace LCD panels


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Picture tubes and LCD panels, including the creation of background light

5 - Being a black spots or nodules on color image display area

Expression:

- On the screen has a black finish display


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The screen has a black finish

Cause:- Due to an object thrown into the tube being repaired or inadvertent, that you

forget to screw a light under the table and then fly them to break the overlap of

the colors on the screen.

Fix:- In this case you must change or replace broken LCD video light

6 - The screen is bright white, no image

Expression:

White screen no picture.


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Cause:- This is usually due to vascular damage LVDS circuit is attached to the tube

Fix:

- With this disease you can fix it after you find out LVDS circuitry associatedwith tube

7 - The following cases are often not the fault lamp.

1. Lost image, the screen just black and white stripes across the screen.

- This is usually not the fault of the tube that fault block image signal processing

- When H. Blank signal loss from circuit to circuit LVDS Scaling put it generates

the following hi


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2. Wrong color screen, photos with vitiligo.- When the image looks with blood thinners or similar disease vitiligo spreading

oil, it is often not the fault lights

- The cause of this phenomenon is usually caused by the loss of one or more sugarDigital color signal from circuit to circuit to LVDS Scaling


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3. The monitor has vertical stripes color screen- This is usually not the fault of the tube that fault block image signal processing

- When the Pixel Clock signal loss from circuit to circuit LVDS Scaling put it

generates the following hi


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4. Thui black screen, albeit on light.There are two cases led to this phenomenon

a) If the loss of background light (takes high pressure)

- When the black screen but when you get light shed on the screen you see a dim

picture of the inside lights.


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b) If the Video signal loss- In case of broken video signal processing circuit also causes burned black

screen, with this case from an angle you look at the show is still on screen.


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8 - Frequently Asked Questions

1. Question 1 - When buying an old LCD then check howAnswer:

When buying old LCD you should note the following:- Looking at the screen brightness is achieved with the request of you?, Normally

the screen has good brightness for more vibrant images.

- Setting up the highest level whether Contras were no speakers, some bad screen

when tuning up the Contras more light goes speakers were no longer visible andimage details.

- Getting a black screen on 100% and 100% white to observe whether the mystery

death?, Every point you die cost minus 10% if you accept buy it.- Viewed from an angle you see a clear picture does not?, Some screens are less

narrow perspective when you look at it sideways was clearly the wrong color or

shape.- You see the smallest detail on the screen is not sophisticated?, Such as

handwriting, they line the stronger the showing of the screen resolution is higher.

- Setting up the resolution on your computer to view the screen can display the

maximum resolution is, if the display has low resolution, when increasedresolution at higher computer resolution maxima of the screen it will take shape,

so the screen resolution as high as possible.

- Open a landscape view with vibrant color, if color is more vibrant colors toshow depth as high.

2. Question 2 - Monitor errors and fix what is not?Answer:

Monitors tend to have the following error that can not be overcome or are difficultto overcome:


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- Dead pixels display color (on screen with color spots have not changed in any

situation)

- Monitor stripes vertical or horizontal color screen- Monitor or deep black spots on screen

- Monitor the broken, damaged.

3. Question 3 - Screen lost in green, purple just off screen, probably because thelight is not broken?Reply:

- With a CRT, the phenomenon may be due to corrupt good Ka G, while the LCD

screen is not a phenomenon caused by light.- In light of the CRT, the color is light or not is dependent on the electron beams

emitted from Katot respectively, while on the LCD, the color spots are caused by

a common signal is the pulse of Pixel Clock control, if they lose this momentum

will take pictures, not just the wrong color- The phenomenon takes on a color LCD display usually a color signal loss from

the Video Card lead, can be caused by broken signal cable.

4. Question 4 - Please compare the two types of lamps and lamp LCD CRT

Answer:Same:

- Both screens were scanned using principles to create animations.- Both screens can display a multitude of colors, but in fact only three basic

colors: red - green and blue.

Different

- Light CRT electron beam to excite the phosphor material emitting light directlygenerated from phosphorus layer, there are three types of phosphorus and they are

capable of emitting red, green and blue ray when electronic stimulation.

- Back light LCD display, the voltage used to control liquid crystals allow light

through more or less, every part of the liquid crystal color filters to filter out red,green or blue.

- Light CRT deflection coil used to drive the electron beam scans horizontally and

vertically the screen, then roll back the driver electron beam scans from left toright scrolling screens also blinds the driver for driving electron beam scans the

screen from top to bottom.

- LCD back light using electrical impulses to move the control to the next pixel,

each pixel clock pulse as it appears to move to the next control point image on theright, each pulse H. Blank it appears that the next move down the line and each

pulse is V. Blank appears she returned to the starting point of scanning to a new

screen.

- Because the color is emitted directly from the phosphorus layer should generally

brighter than CRT monitors and more vibrant color LCD screen

- CRT uses magnetic fields to drive the electron beam and inevitable phenomenon

known as curved edges or distorted when your knee makes graphic design, thelines were curved, while the LCD screen Straight lines are always absolute.


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- On-screen CRT with the phenomenon of blurry photos when the weather is wet

Focus also wrong voltage on the LCD screen will never be the phenomenon.

- CRT when the light emission of good ka weakened causing blurry and thewrong color, then you must replace the lamp, while on the LCD screen, goes dark

when you can replace with high-pressure balloon cost is very small compared to

the light to change.

- Lamp voltage CRT HV up to 15.000V 20.000V also to light the LCD voltageHV to 1500V only from 1000 so it's safer for your workers.

- CRT light can emit ultraviolet rays are harmful to human health also use the

LCD screen is not.

- Light CRT has caused the phenomenon of infection from blood-thinning LCDscreen is also not affected by magnetic fields.

5. Question 5 - Determine the similarities and differences between tube andLCD TVs LCD MonitorAnswer:Same:- Both screens have the same operating principle

- Both screens have the same structure

- The evaluation criteria for the quality of two types of lights have somesimilarities

Different

- Lamps LCD Monitor Image resolution is often much higher than LCD TV

picture tube

- The Pixel Clock frequency, and V. Blank H. Lank of higher LCD Monitor LCDTV's

- Technology lamp manufacturing of sophisticated LCD Monitor LCD TV picturetube

- Max brightness of the screen LCD Monitor is often weaker than the LCD screen

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LCD Laptop or Monitor