Question about LG DU-42PY10 42 in. Plasma HDTV

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DU-42PY10X Has sound but no picture.

My TV has sound but no picture. I had a similar problem last year, when it had vertical bars. It was under warranty so it was fixed, although I dont know what was replaced. Now with my warranty expired, Im left with the problem in my hands. Can any one help? I am mechanically inclined, I just need the right direction. Thanks.

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  • romia Apr 30, 2008

    I also have the same problem : no image (black), no sound on my 42PY10X LG plasma TV. When i switch the power on, the screen is black and there are very thin and discontinued white horizontal lines. CET, i don't see how to test Vs and Va voltages. Where are the testing points ? on the Power Supply board, or on the ysus and zsus ? I attach a picture of the power supply card. In case you know where the testing points are, could you please indicate their positions ?
    The info inside the TV shows : Vs = 198V and Va = 60V. Are those values realistic ? I want to make sure. Many thanks for your help



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I have an DU-42PY10X LG model and I'm trying to fix the image, it's totally out but it does has sound.... I did checked the filters./Transistors none of them are out... But at the same time I need to re-assemble the sound board and the fans in the right connectors.... When I turn it on, after the fans goes on, it shuts down by it self...Can some one help me?>??? If possibly where can I download a Service Manual for it?? Thank you sor your help in advance!

Posted on Dec 27, 2009

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When a plasma has no picture I have found that 9 times out of 10 the ysus bd or the zsus bd has failed and sometimes both have failed at the same time. When you pull the back of the unit, you will find the the large pcb on the left as you look at the back is the ysus bd. and the bd. on the right side of unit is the zsus (it is about 1/2 size of the ysus bd. Check the fuses on both bds. and if one is open see if replacing will help. If it blows again the bd. that the fuse is on is most likely defective. The VS and VA voltages are listed on a tag on the inside of the plasma panel and those voltages should be checked. If either of those voltages is very low or missing, first disconnect the plug from the power supply to the ysus bd and check the voltages again. If the voltage comes up then the ysus is defective. If the v does not come up replace that plug and pull the plug from the power supply to the zsus bd and check again. If the v then comes up the zsus is most likely the cause. Remember to disconnect the AC to the unit b4 each step. Of course there are other possibilities and I alway reccomend that if your are not proficient with handling meters and AC and DC voltages then please contact a qualified service tech.

Posted on Feb 16, 2008


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