Question about LG 42PJ350 42 in. TV

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PLASMA TV PROBLEM


The TV model is LG 42PX4RV-MC. The problem has started like this:

The TV was powered on, working good about 1 hour. Then, suddenly, I heard a loud noise seamed like some “glasses breaking/exploding”. After this noise, the TV image has disappeared. Only the TV’s sound is working. I don’t have any TV’s electric scheme or block diagram. I opened the back cover panel and noticed that the fuses, from both boards, that have flat cable connection to the picture screen, were burned.
Only the power board is with its fuse ok.
Now I’m asking if the problem becomes from the Plasma Picture’s “SCREEN” or it could be any other problem, like an “over voltage”, from the power board, that could damage the other circuit board and their fuses?

Thanks in advance,

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The problem with this set, is defective YSUS board, to avoid future same problem, you must change the following boards: YSUS, ZSUS & Control.
Verify with LG if your serial Number is included within
lots production that were recalled by this design defect

Posted on May 28, 2010

Testimonial: "I'll try to contact LG dealers. Very hank you sir"

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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.
 

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