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12/9/2017 Bit of electronic engineering porn - Inside a Raymarine E120 broken backlight

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Thread: Bit of electronic engineering porn - Inside a Raymarine E120 broken backlight

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08-09-15, 14:55

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Oct 2003west yorkshire

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Bit of electronic engineering porn - Inside a Raymarine E120 broken backlight

Last spring the backlight died on the ybridge helm plotter. So for the summer I swapped it with the inside helm unit as werarely use the inside station, especially in the summer. I brought the faulty unit back to the UK and contacted Raymarine to get itrepaired. Not good news as depending on the fault they can no longer get parts. The usual culprit apparently is the high voltagetransformer coils,or high voltage converter transistors (my favourite) or the cold cathode miniature ourescents (CCFL) that

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create the bright white light. I took my unit apart very carefully and powered it up out of its housing and measured the highvoltage output. Over 1100 V being generated and a faint ickering in the CCFL tubes. (so be careful if you try this at home, if youget hold of it by the naughty end it will hurt quite a lot).

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KJØP

Lillian leselampe

150,-

The high voltage bit is helpfully marked DANGER. Clearly the voltage generator is working ne, so called Raymarine and askedto buy the CCFL light assembly. Unfortunately its no longer avavilable and an internet search didn't nd an equivalent. It ispossible to get custom units made but didn't want to go that way. Obviously I am observing class 1 clean room conditions (wellnearly and it is a new bit of chip board its all siting on)



So decided to convert it to LED backlighting. Bought two exible LED light strips from maplins, cut them in half and stuck theminside the light box inside the display assembly with double sided foam tape



Popped it all (mostly) back together again and powered it all up and voila!



Not a great photo as the Hudl camera struggled with the contrast. However that is taken outside on a cloudy september day.Should be OK in the med, if not I will double up the number of leds to get it a bit brighter. The backlight isn't perfectly even butin daylight with a human eye its hard to tell. At the moment I am running the LEDs from the main input supply via a voltageconverter (boat is 28V, leds are 12v) so I can't dim them using the plotter functions. I don't have a circuit diagram for the plotterand as its all very small surface mount devices and I don't have the equipment to properly work on it, I can live without thedimmer function for now.

Last edited by kashurst; 08-09-15 at 15:01.

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