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My 42" LG Plasma TV 42PG20 has had a thin black horizontal line about an inch from the top for quite some time, the TV is about 2 years old and the line appeared roughly 6 months ago. Suddenly, today there is another thin horizontal line going across the middle of the screen. What's up with that?

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Most common cause of this is Bad ,leaky capacitors
Bad Caps will look vented,swollen or puffed up on Top,
1000uf 16v 2200uf 10v 220uf 10v 3300uf 10v

Posted on Sep 15, 2010

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i have seen on some of those models bad power supplies. if you take the back off the tv you wil see a board in the top center that is the power supply board. you may have about 8-9 vented capacitors towards the left hand side of the board. they will look like they are exploding on the top some may even have black residue on the top that is the leaking electrolytic fluid. they will proabaly be 3300micro farad at 16volt high temp 105degree capacitors.

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There are several known issues that can cause that.

The top candidate is the main board, the next is the Y-Main board.

Here's a link for repairing the power supply board of LG 42PG20, which also contains a link to how to test your own board to see if it is good or not:

http://www.coppelltvrepair.com/p/716/lg-42pg20-ua-power-supply-board-repair-service

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