No picture symptom on this plasma TV suggested a problem with Y-sustain board and Y-buffers. It features problematic LJ92-01203A / LJ41-02761A and LJ92-01202A / LJ41-02760A with 6 ICs. I checked out Coppell Repair Blogs and some threads here, that helped me to identify shorted buffer and a shorted power FET.
I replaced a shorted lower buffer and one bad IXTA36N30P power fet under the heat sink on the Y-sustain board.
The TV still powers up and stays on with NO picture. I even tried connecting one buffer at a time - no half picture. Checked the voltages, Vscan is present and stable with Y-sustain connected or disconnected. Nothing is getting hot, both Y-sus and Z-sus are making a normal "hum". Ve for Z-sustain present and stable.
I checked the Y-sustain board's main IC - no shorts. The fuse was also fine.
Output voltages to Y-buffers are around -71V.
Looks like something else might go bad on Y-sustain board. Any ideas?
All suggestions very appreciated!
Thanks,
Rob
I replaced a shorted lower buffer and one bad IXTA36N30P power fet under the heat sink on the Y-sustain board.
The TV still powers up and stays on with NO picture. I even tried connecting one buffer at a time - no half picture. Checked the voltages, Vscan is present and stable with Y-sustain connected or disconnected. Nothing is getting hot, both Y-sus and Z-sus are making a normal "hum". Ve for Z-sustain present and stable.
I checked the Y-sustain board's main IC - no shorts. The fuse was also fine.
Output voltages to Y-buffers are around -71V.
Looks like something else might go bad on Y-sustain board. Any ideas?
All suggestions very appreciated!
Thanks,
Rob
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