Hello guys, this is my first thread on badcaps forum.
I am asking for your help in repairing the LG50PQ3000 plasma I got.
Its initial problem was that the TV wouldn't turn on, and it made that clicking sound. It had no voltages on the PSU, just the some unstable standby 5V. Changed the VSB3200 schottky diode with some equivalent (not schottky) and it works.
Ok I turned on the TV and voila... entered the menu, configured the programs. After finishing the auto programming job (10 min maybe), the display suddenly shut down, heard some noise before this, but not like exploding or something similar, just some noise. The sound was still working, I could hear the TV program.
I disassembled the TV again to see what happened. Nothing visible... just a round crack in the middle of the YSus board. Had a look on the bottom of the Ysus board, and seemed that the crack cut 2 routed lines (one was the connection with the ground). I said to myself it's the crack, I'll repair it. Repaired the crack but no result.
Then I turned the TV on and listened carefully.I could hear some repetitive and discrete "beep-beep" sound coming from the radiator next to the drivers (this sound could be heard right from the moment when the display stopped).
I had a look into the service manual, I verified that my PSU was ok all voltages were good, then I verified all the components attached to the radiators (diodes and transistors) and seems that 4 transistors are shorted: 3x30j124 and 1x30f124. Also the input fuse of the Ysus board was broken.
Ok I ordered those IGBTs, but I want to ask you, if I change them with the new ones, the TV will work or I will get the same problem, breaking the new IGBTs? How can I assure that my problem was the cracked PCB and now it will work fine?
I will attach some pictures of the board.
Guys I can't wait to see your replays! Thank you!
I am asking for your help in repairing the LG50PQ3000 plasma I got.
Its initial problem was that the TV wouldn't turn on, and it made that clicking sound. It had no voltages on the PSU, just the some unstable standby 5V. Changed the VSB3200 schottky diode with some equivalent (not schottky) and it works.
Ok I turned on the TV and voila... entered the menu, configured the programs. After finishing the auto programming job (10 min maybe), the display suddenly shut down, heard some noise before this, but not like exploding or something similar, just some noise. The sound was still working, I could hear the TV program.
I disassembled the TV again to see what happened. Nothing visible... just a round crack in the middle of the YSus board. Had a look on the bottom of the Ysus board, and seemed that the crack cut 2 routed lines (one was the connection with the ground). I said to myself it's the crack, I'll repair it. Repaired the crack but no result.
Then I turned the TV on and listened carefully.I could hear some repetitive and discrete "beep-beep" sound coming from the radiator next to the drivers (this sound could be heard right from the moment when the display stopped).
I had a look into the service manual, I verified that my PSU was ok all voltages were good, then I verified all the components attached to the radiators (diodes and transistors) and seems that 4 transistors are shorted: 3x30j124 and 1x30f124. Also the input fuse of the Ysus board was broken.
Ok I ordered those IGBTs, but I want to ask you, if I change them with the new ones, the TV will work or I will get the same problem, breaking the new IGBTs? How can I assure that my problem was the cracked PCB and now it will work fine?
I will attach some pictures of the board.
Guys I can't wait to see your replays! Thank you!
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