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Lg 42 plasma half of the screen works after Disconnecting the bottom y board

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Go for the seeting and find the screen size,

Posted on Apr 21, 2013

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1 Answer

Half of my tv screen isnt working


Plasma sets use (in most cases) two boards: each one drives half the screen.

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Mostly LCD sets have backlights---set will have a board that drives top half and another that drives lower half--some are called sustain boards etc and even 2 are combined into one.

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Buffer boards or Y-SUS main needs to be replaced. What do you mean by motherboard? The power supply board or the Logic or X main.... They YBU/YBL and the YSUS work in unison. Y-Buffer upper controls top half, Y Buffer lower control bottom have YSUS controls both of those. There is also D, G, E F boards that can split screan. But they to are controlled with the Y-SUS Main. Hope this helps...

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Hello Fixya customer,

Thank you for your question.

The are a couple of possibilities here including the logic board, lower "Y" board, lower "Y" buffers, and PDP panel. The "Y" is divided into into the lower and upper half of the screen. An experienced technician can quickly isolate the fault upon inspection and verify the supply voltages.

Thank you for using Fixya, and if I can be of further assistance please let me know.

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1 Answer

Perfect pic on top half of screen bottom half blank


Most likely the lower y-buffer board which is mounted to the left of the panel in the back of the TV is bad. I believe you can get LG equivalents for these boards. There should be part numbers on the board itself..

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first try the address board or buffer board.if this
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1 Answer

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there is a defected capacitor in the vertical circuit trouble shoot and replace. or if the vertical circuit is separate then replace the whole board.good luck

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1 Answer

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first check all of your ribbon cables. then check the lvds cable. if this dont fix then you will have to get a service manual and run the panel by itself to determin wich circuit your problem is in. any questions feel fre to contact me....

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