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Manage My Life

How can I get my LG TV to turn on?

by Manage My Life Last activity date:
August 25th, 2011

I have a LG TV, model number 37LC2D. It's 4-5 years old. About ~2 weeks ago, it started taking ~30 seconds to turn on - the green light on front would blink for a while, then go on solid, then after another ~15 seconds, the screen would flash white a couple times, and then it would finally connect to the HD cable box. Unfortunately, a few days ago it just started turning itself off, and finally we now can no longer turn it on at all (for a day or so, the green light would come, but the screen would just never turn on - now I can't even get the green light to come on).


I tried the suggestion I got from LG, which was to unplug it, hold the power button for 30 seconds, then plug it back in, but that didn't work. I also unplugged it, waited a while (e.g. for it to cool down), then plugged it back in, but no success there either.


My quick Google search suggested maybe it overheated, e.g. blew a capacitor or some board (several people complained of the same issue on LG LCD TV's, and that appeared to be the consensus for the cause). I'd like to take a shot at repairing it, before going to buy a replacement. Sears said they'd charge $100 just to come take a look, with no estimate on likely charge to actually do the repair. The local Sears repair shop said they'd be happy to sell me parts to try repairing it myself, and suggested I check this site for help. Any thoughts on what the problem might be, what parts I should order, and how I could try fixing it? I'm not the handiest person in the world, but I'd like to give it a shot, and would appreciate any help you can offer.


Jeff

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LG , Televisions
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Answers (9)
Manage My Life
I think it is two separate issues. Your older CRT TV has been sitting for awhile. The electronic capacitors inside can dry up when not being used. The capacitors help stabilize and maintain voltages. When they dry up they take longer to stabilize the voltage. The tuner inside your TV has several capacitors to tune into each channel and they need to warm up to tune each channel.
by Manage My Life
August 25th, 2011
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Manage My Life
Thanks for the response. Out of curiosity, any idea what could cause the problem with the inverter board (after just a few years)? Are they just a notoriously troublesome component? If so, any recommendation for brands that are either more durable, or easier/cheaper to fix?
One the topic of potential causes, we've had trouble with cable reception on our old 19" CRT that I pulled out when the LCD went down. Had a technician from the cable company out (twice), and he says the cable is fine, but he suspects a power problem and suggested I hire an electrician (and not to buy a new TV until that problem is solved). The CRT's issue is that, when I turn it on, it gets nothing but snow for a few minutes, then the picture comes in. Once it's warmed up, it's fine, and if I then turn it off for a few seconds, it'll come back on OK. Any idea what's going on? It seems too coincedental that I have problems with two TV's (with different technologies) with the same connection (even after I switched out the surge protector to a brand new one).
by Manage My Life
August 22nd, 2011
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Manage My Life
It does look like the inverter is part of the LCD panel. You could replaced the LCD panel, but it would cost about the same as a new TV.
by Manage My Life
August 22nd, 2011
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Manage My Life
Thanks for the response. I looked a bit more, and saw big metal shields going from the top to the bottom on each side, so I was hopeful I'd find the inverter boards underneath. I don't think I did. I've added pictures of what was below them. I saw one small green board on one side.
If the inverter board is part of the LCD panel, and the entire panel has to be replaced, I'm guessing I'm just as well of buying a new TV?
by Manage My Life
August 20th, 2011
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Manage My Life
The first pictures are not the inverter board. The inverter boards are go from the top to the bottom of the TV and might be behind a metal shield. Some inverter boards are part of the LCD panel and are not available by themselves and the entire LCD panel would have to be replaced.
by Manage My Life
August 12th, 2011
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Manage My Life
I also pried a bit further into the back of the TV, though I didn't go so far as to expose all the circuitry. Here are a couple more shots, showing (1) where the power comes in from the cord, (2) a bunch of capacitors, etc? and (3) a random shot down the back of some boards. None of these seemed obviously damaged to the (untrained) eye.
by Manage My Life
August 10th, 2011
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Manage My Life
Thanks for the suggestion. I opened up the back of the TV, and I think I found the inverter boards (green boards on either side of the TV - see my pictures. They didn't appear to be burnt up or otherwise obviously damaged.
Are these the inverter boards you were referring to? If so, do they look damaged to you?
by Manage My Life
August 10th, 2011
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Manage My Life
Most likely the problem would be an inverter board. The inverter board ramps up the voltage to turn the back light on. Your TV should have an inverter on both sides. You could open your TV and look at the boards on the far right and left and see if you see a anything that might look burnt up then that would be the first place to start.

Note

: Working on a TV can be difficult due to the

high voltage

circuits inside. Always remember to unplug any TV before trying to work on it.

 
Answered in 15 hours
by Manage My Life
August 10th, 2011
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Joseph Perez
I know how important it is to have a good working television in the home so that you can stay updated with the news. While you are waiting for your expert answer, I did manage to find a link that will provide you with some good information to help you with your question. I hope my link is useful.
Answered in 8 minutes
by Joseph Perez
August 9th, 2011
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