Hi all, I need some help with my LG plasma TV.
I have an LG 42PC51 plasma TV with sound but no picture.
The story:
The TV stopped turning on. I've checked the power board, there was no Va nor Vs voltage, at least 3 MOSFETs, a Zener diode, and a transformer were burnt. After replacing power board, the TV started to turn on for a second or less and then turned off. After disconnecting Ysus and Zsus power supply the TV turned on and there was a sound. I've checked main ICs at Ysus and Zsus and they were shorted so I've replaced them (only ICs). Now the TV turns on and there is sound but no picture. I'm not sure but it seems to me like the logic board is not firing up the Ysus board. The logic board is PDP 070209. There are four LED'S in a row (D1-4) and one separate (D15) on it. D1 is off, D3-4 are lit and D 15 is blinking.
Now my question is how to find out if the logic board or Ysus board is faulty. Any suggestions?
I have an LG 42PC51 plasma TV with sound but no picture.
The story:
The TV stopped turning on. I've checked the power board, there was no Va nor Vs voltage, at least 3 MOSFETs, a Zener diode, and a transformer were burnt. After replacing power board, the TV started to turn on for a second or less and then turned off. After disconnecting Ysus and Zsus power supply the TV turned on and there was a sound. I've checked main ICs at Ysus and Zsus and they were shorted so I've replaced them (only ICs). Now the TV turns on and there is sound but no picture. I'm not sure but it seems to me like the logic board is not firing up the Ysus board. The logic board is PDP 070209. There are four LED'S in a row (D1-4) and one separate (D15) on it. D1 is off, D3-4 are lit and D 15 is blinking.
Now my question is how to find out if the logic board or Ysus board is faulty. Any suggestions?
The TV is at my mother's in law home and I had no tools to solder the autogen contacts. As you can see there are no pins, just two small contacts with holes. Instead I've put a piece of wire into those holes but nothing has appeared on a screen. The wire was a bit loose thus I'm not sure if it was properly connected. I'm going to solder two pins and connect them with a jumper to be sure but I'm pretty sure that the result will be the same as previous. As far as I understand if the test patterns appeared this would mean that main board is bad (correct me if I'm wrong) and I don't think this is the case. As I've mentioned in previous post the power board, Ysus and Zsus boards were bad so my logic tells me that it's logic board or Ysus board is causing a problem.
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