TV with a black screen suddenly?

7

71dusterman

Well-known member
I have a 47" LG TV that suddenly gave a black screen. Any info I found at the time said it was the motherboard and there were few available for a decent cost. I bought a replacement but never threw the old one away.

I started to think about it earlier this week as the wife was cleaning the basement big time in prep to get a gas fireplace in and decided to research it some more. I found a website that talked about getting tv's to work again for free. I was not sure but!

I had time today so I took the motherboard out and took my toaster oven out to the garage and set it to preheat to 390* and once there I put the tv motherboard on a piece of cardboard and set the timer for 10 minutes as per instructions. I let it cool on its own while I had lunch and then pulled it out and installed in the tv. Turned on with the remote and she powered right up ready to go. Re-assembled the tv and my son will have a 47" upgrade to his old 27" in the apartment he moved to a week and a half ago.

This method may apply to any other electronics that stops working. Made me a believer even though I went into it with scepticism.
 
Only thing I found sketchy about this was placing it in the oven on a piece of cardboard!😳 How does that not ignite?
 
Cardboard is to protect the board from the wire grill and not close to the heat source. I wasn't sure about the whole thing until I put it back in the tv. I like the price to repair a none working, originally expensive 3d capable tv. Apparently this can be done to save locked up X-box and PlayStation systems as well.
 
My son did a similar thing with laptop motherboards years back with good success. And about 4-5 years back my Phillips 47" died. I opened up and found 2 capacitors bloated. Wrote down the specs on them, quick ebay search, $14 later solder in new caps, BINGO, working great yet.
 
That’s a good one.

Another common problem with TVs and monitors is cheap electrolytic capacitors that fail.
I’ve fixed a handful of monitors and a TV with a couple bucks in new capacitors and a soldering iron.

Usually, the worst are in the power supply board. You can see them bulging if they’ve failed.

There’s one other common fault mainly in older LED units - there’s a capacitor that is part of the circuit feeding into the panel. It’s hard to describe but almost all of them are at the top corner of the panel and usually surface mount. They tend to go poof a lot. I’ve fixed on monitor by replacing this one cap. I had another monitor that was likely the same scenario, but after dealing with it once, I didn’t bother with it again. :j
 
I have replced 3 caps on a Samsung led tv before and 2 caps and a resistor on a Maytag washer that they wanted $300 plus the service call. I found a writeup by an electrical engineer that said those 2 caps and resistor were undersized. I fixed the machine for around $30 because you also had to replace the wax seal which the blown board takes out. ( another name for the locking mechanism.)
 
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