Question about Zenith Z42PX2D Television

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Black spots on television when turned on, disappear within five minutes. Is this a voltage adjustment?

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There is no voltage adjustment that will help this. The only voltage adjustments that will improve the picture si the VS and the VA voltages, and they will only need to be tweaked if you have red or green sparkles or small dots on the screen. This is a tough one because it could be either the panel(screen), the Y-sustain or X-sustain module, or the control pcb module. Some techs are replacing all 3 of these boards to be on the safe side, but that would be expensive. Without doing several tests and voltage checks, it would be impossible to say exactly where the problem is. If it's the panel then it probably won't be worth repairing.

Posted on Sep 15, 2010

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Black screen after five minutes of watching. Audio is fine but no video.


What would need to be done here is some voltage tests on power board when set is working and then again when it is not, also a valuable source for some parts:

http://www.partstore.com/Part/Samsung/Samsung/LNS4051DXXAA/Samsung/Samsung/BN4400134A/New.aspx

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If you can locate these controls on the transformer, make a slight adjustment to each in turn, noting where the control position is before adjustment, so you can put it back.
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Before adjustment, set the TV brightness control to about mid way. Ideally the screen should have a completely black image to show up the scanlines.

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1 Answer

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1 Answer

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