LG LCD 50'' problem

[AaronFPS]

When i turn it on, it will have like a tick sound and grey screen for one second, and then it just turn off itself.

 

What's the problem?

[Tesseract83233]

It's hard to make a diagnosis by sitting in front of a screen, probably at the other end of the world. But let's try... ;)

 

TV manufaturers always design their components in a way, where they're really close to their performance limit. By doing this they make sure that the TV lasts (most times) for about 3-5 years, but then the capacitors fail in most cases. The spare parts are just a few bucks, but the work that has to be done by workshop makes it too expensive for most consumers - and so they buy a new TV :/

 

If you want to fix it by DIY, here's a short guide:

 

 

First of all - what I'm recommending you should usually only be done by an professional electrician!!! Unplug the power cord and wait at least 15 minutes before taking your TV apart!

Make sure the power cord stays unplugged, as long as you are working on the TV

Before touching an PCB on the inside of the TV, ground yourself by touching a part of the metal housing of the TV (i.e. the holes where a wall mount could be mounted)

 

Considering my 5 year work experience in fixing LCD screens, I'd first check if there are any broken capacitors on the power supply board (the one where the power cord usually plugs in) .

Usually, they look like this: http://bit.ly/15gaII9

but if they're broken, they often get a bump on the top and look like this: http://bit.ly/18kdmes or even this: http://bit.ly/101RrFD

If so, you can try to change them (if you have experience in soldering)

If you want to, you can look for some with a bit highger voltage rating - i.e.: if an 1000µF 16V is broken, you can exchange it with an 1000µF 25V - BUT remember that they are a bit bigger and might not fit AND that the capacity (µF) has to stay the same! The ratings are usually printed onto the side of the capacitor.

 

If you need any further help, contact me! :)