LG Backlight out, Please Help

[bjlasota]

Good morning,

I have an LG 32LE5300-UC that recently stopped working. When I plug the tv in and turn it on, the LG symbol comes up, then the static, then after about 10-15 seconds, the backlights go out. This is an LED TV. I can see and mess around in the menus when I shine a bright flashlight on the screen.

I have replaced the Power board which also came with a new LED drive since it's part of that board and it still has the same issue. As far as I know, there's only 3 things that can go wrong with an LED. The power board(changed), the Tcon board(but I shouldn't see a picture even if with a flashlight right?), or the control board(which wouldn't be bad if I can play with the menus?).

Can anyone help me out in figuring out what the issue might be? What tests can I do to maybe pinpoint the issue?

[Terryfictv]

Re: LG Backlight out, Please Help

Bad LED / LED strip inside panel.

[bjlasota]

Re: LG Backlight out, Please Help

Would a defective LED bulb temporarily light though? When I turn the tv on, there are LED's all over the whole tv. I can see the picture perfectly from the front, and with the back off, I can see a ton of LED bulbs lit up. They all go out at once. And it's repeatable. Turn tv off-turn back on, all lights back on, then go out again and stay out. If this still points to a bad bulb, what kinda work am I looking at to replace a defective bulb? And how would I determine which bulb is bad if they all come on and all go off at the same time?

[jts1957]

Re: LG Backlight out, Please Help

YES!
You've received the SAME answer on (at least) three forums.

Disassembly of panel until you can see ALL LEDs at once, or remove from panel and hook them back up.
http://www.ebay.com/itm/LG-LC320EUH-...-/180571777615

[bjlasota]

Re: LG Backlight out, Please Help

So after tearing everything down, I found 1 bad led on the lower right board. I've googled the cap out of part numbers and have come up empty handed. I see the eBay part your posted, but I think that a new led board should exist somewhere. Is there an online store where I can get a replacement or can I maybe buy a cheaper led strip that will fit, put. New connector on the wires and go that route?

[jts1957]

Re: LG Backlight out, Please Help

Unfortunately ALL manufacturers make their money by selling TVs, NOT parts.
They may have a very limited supply of Panels, LED strips, or possibly the individual LED bulbs, but whatever they have would be furnished for warranty purposes.

Of course, you can try to find a replacement LED with similar characteristics, possibly Digikey, Mouser or even one from a similar strip.

I seem to recall reading, i believe it was here, that dead LED could be bypassed with a regular diode.

[Andrew F. Ali]

Re: LG Backlight out, Please Help

If its just one (1) LED that is bad you could simply bypass that LED with a 1N4001 diode and the set will work or just use a wire bridge.