Question about LG MZ-42PZ14 42 in. Plasma Television

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LG 42PX4RV went blank

Hi, i was watching the TV and all of a sudden the TV went blank, saound is there as normal for all channels but no TV, can not view the menu options either, plse advise

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  • tores12 Jan 11, 2009

    Hi, I have a lg 42px4rv model plasma tv. I have a problem, in fact when appear a black image in the monitor i have blue green and red pixel that are pulsing in the black. Pratically the black image, after a white image, have some problem to turn back. Do you have some Idea to resolve the problem?

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Plasma sets have a little in common with th eolder CRT sets in that they use much higher voltages than LCD sets do except in the circuit powering the backlight. 

If it is affecting video only, the display's power supply is probably at fault and without some technical background and a couple of test instruments, you will not be able to do the repair yourself. 
What you can do though is; unplug the set, let it stand overnight or at least several hours, remove the back panel and look for two separate boards with mostly larger components on them; they will have ferrite core transformers on them and several larger capacitors which are cylindrical and mounted vertically to the board.

 
Before touching anything inside, especially on either board, allow several hours to be safe since the larger capacitors can hold a painful voltage charge for some hours.  
 
The section most likely to fail and cause your problem will be one that you see associated more with the display than the incoming AC line; the latter is the main power supply and its failure would result in no sound or video. 
 
If you see signs of overheating such as discoloration of the board material, it may not be repairable but if you can find a part number on the board, you might be able to buy the power supply and install it yourself.
 
If there are no signs of heat damage to the board, there may be companies offering to repair it as a subassembly instead of repairing the whole set which could be much more expensive.
If you choose to replace or have it done, the power supply still may not be at fault since most are capable of switching on and off if a downstream problem is causing an overload.
 

Posted on Oct 07, 2008

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