37 inch LG LCD won't turn on due to power failure

LG 42LS5700 - LG.com

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Widescreen TV Black Screen - Repair LCD LED PLASMA ...

? 3:41
https://www.youtube.com/watch?v=RbZncfiOXQA
Jul 13, 2011 - Uploaded by FixItUrselfDummy
Fix your tv with black screen blinking light, popping sound noise. ... Watch QueueQueue ... TV Black Screen - Repair LCD LED PLASMA - Problems SONY LG .... I have a 60 inch samsung DPL tv how can I stop the humming or ... What do I do if my tvturns on but its just a black screen so sound no picture?.

I would have the power supply caps checked first. If the power supply checks ok, I would suspect a main board failure.

It probably has a cracked circuit board. If you want to repair it on your own open it up and see if you can find where that cracked section is and see if you can resolder it back properly.

You power supply has failed and requires repair.

Unplug it for about an hour to let it reset itself and try again, if it still has problem then you will have to open it up or take it to the repair shop. The power supply module will have to be looked at first to make sure all the voltages are present. Right now the 5vdc standby power supply is working and may be partially function processor.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Hi

Power supply failure. Check the LG site for a good tech

I just want to clear things here.
The stand by light will remain on whenever the tv set is turned on by a button on the side of the tv.

Then use your remote to turn on the tv, but wait as it can take 10secs before you get a picture.

Here's a link to the service manual for a slightly larger LG LCD TV. Perhaps it may be of some help? The troubleshooting section appears to be the same for many models of LG TVs...

http://www.observations.biz/MANUALS/LG_LCDTV/42LF66.pdf

If everything else on the remote works, most likely the PWR function on the remote is not working.

This may be a problem with the conductive rubber membrane under the button, or the matracy circuit is not reading the function due to any number of problems.

You can call the manufacture parts rep to see if it is possible to have parts for the remote. Most of the time, they are not worth to service, and parts are not sold to support remote control service. You will most likely have to order a new remote from the manufacture rep.

I suggest to NOT buy a universal remote. They rarely can do more than the most basic functions. Many times universal remotes have different issues with different models of sets.


Jerry G.