Hi to all the friends of the forum and well found, first of all congratulations for the forum and wonderful, I read for many years but this and my first thread I hope you can help me and thanks in advance.
Meanwhile, I try to attach the GPH12DE chassis diagram, as the title of this TV on power-up attempts to start with fast green LED flashing and then switch to red led with a single flash at infinity, I read various discussions about it..but no definite solution , from what I have read I have done various tests, knowing that it could be the card to lack, fast test of the voltages on the P "LSJB1279" I find only the STB5V to pin 5 of the connector P7, to the ignition on F_STBY_ON of which pin 6 (P7 ) appear momentarily the 3.3v to then fall to 0V and turn off the Psu, disassembled P card checked all electrolytic diodes etc. nothing in short, I did the bench test of the psu as described in various posts, resistance from 1k between pin 5 and 6 on P7 and 1k resistance between pins 9 and 11 on P25, connected lamps in series on the Vsus output, and direct bridge on P34 pins 1 and 3, well the psu turns on and all the voltages are regular as shown on the nameplate, then board P excluded from fault, I know that at 99% the fault is on the A and vor rei groped the repair as the card is almost impossible to find, TNPH0782-3A, as you already know SOS1 unknown error from panasonic, I'm quite equipped with hot air flow, multimeter and digital oscilloscope, any advice on what to check on the A board and well accepted, from my tests I realized that the 3.3v return from A on P called Panel_main_on are completely absent at 0v and never rise, or read that someone has managed to isolate the defect losing some functions already would be a good step, I ask for help to you more externally to try to repair the mainbord, thanks to all those who join the discussion, you are an extraordinary forum
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Meanwhile, I try to attach the GPH12DE chassis diagram, as the title of this TV on power-up attempts to start with fast green LED flashing and then switch to red led with a single flash at infinity, I read various discussions about it..but no definite solution , from what I have read I have done various tests, knowing that it could be the card to lack, fast test of the voltages on the P "LSJB1279" I find only the STB5V to pin 5 of the connector P7, to the ignition on F_STBY_ON of which pin 6 (P7 ) appear momentarily the 3.3v to then fall to 0V and turn off the Psu, disassembled P card checked all electrolytic diodes etc. nothing in short, I did the bench test of the psu as described in various posts, resistance from 1k between pin 5 and 6 on P7 and 1k resistance between pins 9 and 11 on P25, connected lamps in series on the Vsus output, and direct bridge on P34 pins 1 and 3, well the psu turns on and all the voltages are regular as shown on the nameplate, then board P excluded from fault, I know that at 99% the fault is on the A and vor rei groped the repair as the card is almost impossible to find, TNPH0782-3A, as you already know SOS1 unknown error from panasonic, I'm quite equipped with hot air flow, multimeter and digital oscilloscope, any advice on what to check on the A board and well accepted, from my tests I realized that the 3.3v return from A on P called Panel_main_on are completely absent at 0v and never rise, or read that someone has managed to isolate the defect losing some functions already would be a good step, I ask for help to you more externally to try to repair the mainbord, thanks to all those who join the discussion, you are an extraordinary forum
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