My electronics knowledge is that of degraded memories of my physics for non-majors class, so bear with me. I initially thought the varistor was a zenor diode based on the Z symbol on the back of the PSU board (I'm googling up all of this info), so was ready to replace it as there was no reading in either direction w/ my multimeter in diode mode. After cutting a **** in the heat shrink to identify the component it turns out to be a TVR14621 varistor. According to this crude test: http://www.ehow.com/how_7643295_test-metal-oxide-varistor.html It's still good as I'm reading over 2 M-Ohms. I didn't disconnect the component from the board as indicated, though, but figured that was just a CYA type of directive. Am I wasting my time replacing this?
I had the same issue after a thunderstorm. The power control board was perfectly fine. The issues is the video control board. Take it off and look for burn marks. The electricity blew out a HDMI input soder point on the back of the video board. I bought a new video board from eBay, installed it, and it works perfectly again. Video board!! NOT THE PSU!!
Looks like there are some board failures inside and might require attention by a qualified service technician.
SOURCE: After reading several forums when my LG 42PC3D
Y and X-sus boards should be replaced at the same time due to they way they communicate with eachother. I suspect that the x-sus is also faulty.
Thank you!
SOURCE: LG 42PG20 Plasma blew a
Hello,
Once the voltage the television is connected to is very high, there is a very high tendency that the board will blow again, and it might not be as soon as you replace the board.
You will still have to replace the board, but you will try to get a board with higher capacitance on the capacitors. That way if exposed to higher voltage it wont get bad.
Also a tip is for you to get a step down transformer for your television or a stabilizer so as for the television not to be exposed to a very high current. That should help reduce the risk of having the board getting burnt again.
The screen only vents out once there is excessive heat in the unit and the fans in it are not working, then the screen can vent out.
Carefully assess all the boards on the television for any bad capacitors, like the ones that are swollen, it is not necessary for them to be bursted or smelly before they are bad, you just have to check for the ones that are already swollen.
Hope this information was helpful in solving the problem.
Goodluck
Elect_Comp
SOURCE: I own an LG 42LB1DR-UA.
Sir try to use a dvd and put a movie if your unit produce normal sound and picture the problem is the digital receiver. Good day and best regards.
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Cannot grasp what you mean by 'won't fully power on' Can you please clarify on this more?
Hi. I have a red stand by light, but nothing else - no response to power button, etc. Strangely I first noticed that the TV backlighting appeared on without a picture when I came downstairs and attempted to switch the input and got no response from the TV (both with remote and panel buttons). I eventually unplugged it and upon plugging it back in it still fails to respond to input (but no backlighting). I left it plugged in over night and the next morning noticed the backlights were on again. I now think the power supply board is fine considering all this and after checking the voltage reaching the main board. Turns out it's still under warranty, so I have a repair scheduled - assuming they are willing to accept this screen print out from Sears in lieu of a proper receipt.
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