Question about LG 42PG20 42 in. Plasma HDTV

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Is my y board the problem with my lg tv if i have sound but no picture

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TV sets from over 30 years of fixing them can be a lot like fixing your car, you check things and based on what you find may gamble or just guess.

Sets do in fact fail and in this case a number of different issues can cause this common issue----anything from power board to the screen unit (display panel itself) can cause it.

Voltages need to be checked and followed and beyond that at some point boards replaced to see if something short of the display panel is bad---that is fatal.

There are more complicated tests that can be performed by a shop but in the end it comes down to a check and try situation---seen more than one set where with every board replaced still a non working set--bad display which is fatal from a cost point of view.

Google the model number with "parts" and you should come up with a vendor who sells all the boards for your set by model number to get an idea of costs.

Posted on Dec 04, 2012

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SOURCE: LG 42PX4MVH PLASMA TV - Sound but no picture.

I have the same issue with my LG 42PC3DVA and I narrowed it down to the Y SUS board. After a little research there are a few items that are prone to go. The ceramic fuses (as you found), sometimes the capacitors on the Y SUS, Z SUS, and power supply go along with them You can tell because thy will be bulged at the top instead of flat. I replaced a few of my capacitors - they are only $0.89 each so it was MUCH cheaper than a board.

The other thing that is common on the Y SUS in particular are the FETs (also called MOSFET). They can be replaced if you are good with a soldering gun but they are static sensitive so be grounded. They are also a bit tricky to test so you may want to do some research on how to determine if this is the issue... or you can just replace the whole board.

Posted on Oct 28, 2009

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