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,
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
Testimonial: "I'll try to contact LG dealers.
Very hank you sir"
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? 5:29 www.youtube.com/watch?v=PWoz_-3OHIM Jan 25, 2013 - Uploaded by Tampatec
Common LG LCD TV REPAIR - NO PICTURE OR BLACK SCREEN FIX ... came on good with green light working properlybut still no picture.
This happened to my tv. It turned out the wires inside were faulty and dislodged. You may need to see someone in the store. If it is outside of warranty you will have to pay, but it will be cheaper than a new tv!
You need to pull the power supply out and replace the damaged caps on the board. Look for swollen, pushed up tops and leakage around the base of the caps.
You need soldering and basic electronics skills. You also need to pull apart that big tv and pull the power supply board!
You can look on Ebay for pullout boards from people who have broken their screens. It can get you a working board for cheap sometimes!
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
isprobablyat 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 supplystillmay 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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