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Question

LED LCD TV no video/audio. LG 42LV5500

It's an LED LCD TV, Brand: LG, Model: 42LV5500.

When it's plugged in and turned on, the power indicator LED in the corner turns on from red to white, and stays on white, but nothing appears on the screen. It also still gives that audible 'click' whenever power is turned on or off. When it first gave the issue it was connected to the cable box, and there was no sound either when turned on while the cable box was on. Using a paperclip antenna doesn't give any audio static input like you should get when there's no proper source, so it seems like the audio is out as well.

I tried turning it on in the dark to see if the back-light lights were on, but didn't see anything. Don't know if that meant the back-lights weren't working, or if this TV has a closed design which prevents that from being seen (I have the TV open and there looks like another panel inside).

After opening it and doing some research, there are 3 boards inside it and it's one of them that may be the problem: The Power Board, The Main Board, and the T-Con board. I'm trying to figure out which board it most likely is before I purchase a replacement, so I don't end up with the wrong one. I've found general info but nothing model specific, and some point to the power board, some to the T-Con board, some to the main board. The capacitors on the power board do not appear to be swollen or blown.

The boards inside the TV are connected like this:

http://i.imgur.com/wb0HYn6.png

Currently, the LED Back-light is not turning on, the power light is, and the LED Panel is failing the flashlight test. So the:

main power->power board->back-light path: not working
main power->power board->main board->power light: working
main power->power board->main board->t-con board->LED panel: not working

Can anyone offer any input?

Thanks a lot.

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Clarification Request
Did you fix it?

In reply to: LED LCD TV no video/audio. LG 42LV5500

I have this same model that now has the same issue. Did you figure out how to fix it? Thanks

Collapse -
re:

In reply to: Did you fix it?

Hi

Yes, the issue was the chip on the main board. A replacement main board resolved the issue.

All Answers

Collapse -
Answer
Watch this video.

In reply to: LED LCD TV no video/audio. LG 42LV5500

https://www.youtube.com/watch?v=8HG7efTMj78

Now while that's a nice start, any TV tech would be getting the service manual out and following the diagnostic tree. Sometimes you encounter a new TV tech that just wants to know what to replace.

Nope, doesn't work like that.
Collapse -
Answer
this young man in Tampa...

In reply to: LED LCD TV no video/audio. LG 42LV5500

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