I have approximately 3 years old LCD TV Grundig Amira. A while ago it started that it looses picture after 20minutes of operation. Thin horizontal stripes are visible, then slowly the whole screen freezes and turns black.
Interior of the TV looks ok. I put the tv outside on the cold, and it was working without problems for 4 hours. At the room tepmerature it goes bad after 20minutes again.
There are two chips that get quite hot during operation - PIXELWORKS PW1231 AL - DEINTERLACER and PIXELWORKS PW181A -10VL - IMAGE SCALER. But even if i was cooling them down with a fan, the problem didn't cure itself.
I measured also the voltages from the power supply - there are two sets of cables one with 10pins and one with 7. Voltages are 0,027V, 0,043V, 12,15v and 23,40V, so this looks ok.
I have obtained service manual for my TV - main board Beko L6B and LC screen LG Philips LC260W01.
I found out, that there should be voltage of 3.3V on one exit pin of the transformer when tv is working. I get a reading of 3.78V!
Also one pin on connection of power to screen backlight inverter should be max 3.3V, but it is more.
So i guess I have a voltage problem. That could also explain overheating.
The power supply module is GDP-002 94V-0, but I cannot find any datasheet for it. Anyone has anything about this?
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