Re: LG 37LC46 power on problems
I think you might be right.
I've done a bit of testing with the multimeter and all the voltages on the psu match what they should be, I think the TV's past the stage where I might be able to save it....
clarksters
Member
Last Activity: 01-26-2014, 04:35 PM
Joined: 01-11-2014
Location: Belfast
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Re: LG 37LC46 power on problems
Ok, managed to get my hands on a multimeter, hoping to test tonight if anyone can give me some pointers.Leave a comment:
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Re: LG 37LC46 power on problems
Disconnecting the t-con didn't help.
There are two cables from the board that power the lamps, disconnecting either or both of these doesn't stop the TV turning off.
I don't think I'll be able to post a pic of the lamps, but they don't seem any less bright than before, although I don't know if you'd be able to tell if they were.Leave a comment:
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Re: LG 37LC46 power on problems
The main difference is that there's a black cable on the board, you can see it at the bottom of the 3rd photo in post 18.
I think I've identified the third board as the t-con board, I can't see a separate inverter board.Leave a comment:
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Re: LG 37LC46 power on problems
There are 3 boards on the back that I can see, the power board, the main board and a smaller board above the main board that I can't identify, it has a small blue LED on it which lights briefly before the backlight comes on.Leave a comment:
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Re: LG 37LC46 power on problems
There are no obvious bad caps on the new board, it did come "fully tested", I just find it too coincidental that the TV is displaying the same fault regardless of which board I use, but I don't know where else the fault could lie.Leave a comment:
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Re: LG 37LC46 power on problems
Why would I be having issues with the new board though? I bought the new board because the old one had bad caps and was taking a while to turn on. The new problem is it now powers on, the screen comes on and then goes off again after a second.
I can heat the caps on the old board with a hairdryer and replicate the same problem with it. This is a new fault that wasn't previously present in the old board before I replaced it, but is now happening on both.Leave a comment:
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Re: LG 37LC46 power on problems
Images added, the first two are the old board with quite a few bulges, the second two are the new board.
I don't have a multimeter, but I could probably get one if someone wants to give me an idiot's (and I do mean idiot's) guide of what and how to test....Leave a comment:
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Re: LG 37LC46 power on problems
Both new and old boards now display the same fault. I bought the new board because the TV was taking longer and longer to switch on. I can get the old board to switch on again if I heat the caps with a hairdryer, the TV switches on immediately with the new board, but the TV has the same fault of switching on for a couple of seconds then off again with both boards (this was not the original fault that prompted me to buy a new board).Leave a comment:
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Re: LG 37LC46 power on problems
Any more suggestions are greatly appreciated.Leave a comment:
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Re: LG 37LC46 power on problems
I disconnected the button board, the problem is still there.Leave a comment:
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Re: LG 37LC46 power on problems
I plug in the tv
The red standby light comes on
I hit the power button and the green light comes on and the screen appears
After a second the backlight goes out and the screen goes blank
After another second the tv goes back into standby and the green light goes red
I don't think any buttons are jamming because only the power button would turn the tv off, right? And the tv isn't stuck in an on/off loop.Leave a comment:
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Re: LG 37LC46 power on problems
Yes, screen lights up for a second, goes blank then after another second the tv goes into standby.Leave a comment:
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Re: LG 37LC46 power on problems
Yes, I used a hairdryer to get the old board to work and the tv still displays the problem of powering on the screen and then turning off after a couple of seconds, I really don't want to scrap the tv, but I'm at a loss for what to do next.Leave a comment:
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Re: LG 37LC46 power on problems
Ok, I've refitted the old board and managed to get the TV on with it, but it's now also showing the same problem of the tv turning on then turning off seconds later, so it looks like the new board is ok, but there's a new problem with something else.
I should also add the original issue with the tv not turning on got worse during the week to the point where the tv wouldn't even get into standby.Leave a comment:
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Re: LG 37LC46 power on problems
I genuinely don't think I could change the capacitors myself without doing more damage, I don't have a soldering iron either so buying a replacement board isn't that much more expensive.Leave a comment:
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LG 37LC46 power on problems
Hi, new member hoping someone can help.
I've an LG 37LC46 which recently started taking longer and longer to start up, I had a search and thought it was the power board that was at fault, I opened the tv up to inspect the board and there were obvious bulges on several of the caps. So I bought [URL="http://www.ebay.co.uk/itm/251411913756"]this board[/URL] on ebay, I fitted it today, it resolved the power on problem i.e. powered on straight away, but within a few seconds of powering on the screen would go black and then the TV would go into standby again. On comparing the boards...Last edited by clarksters; 01-11-2014, 07:56 AM. -
Re: New Members - please post your introductions here
Hi, hoping for help fixing an old LG LCD I have.Leave a comment:
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