42" LG no backlights

[budm]

Re: 42" LG no backlights

That is it. Test it per post 26.
Your transformer pinout may be like this for the high voltage windings:
http://s807.photobucket.com/albums/y...t=DSC01034.jpg

[cbriggz]

Re: 42" LG no backlights

this one right

[gilly1984]

Re: 42" LG no backlights

hahaha replacing the board or buying a new TV???

Both

[budm]

Re: 42" LG no backlights

You can see it in your picture in post 18, it is a 5-pins MOSFETs. it has that burnt jumper copnnected to one of its leg.

[cbriggz]

Re: 42" LG no backlights

i will can you tell me what U8 is please lol. Remember im new at this!!!

[budm]

Re: 42" LG no backlights

Well, at least check out U8 as I posted in post 26 to find out taht is the reason the jumper burtn up. Then you will still have the transformers to deal with.

[cbriggz]

Re: 42" LG no backlights

hahaha replacing the board or buying a new TV???

[gilly1984]

Re: 42" LG no backlights

That's cheating

[cbriggz]

Re: 42" LG no backlights

ok well for the price i will give it a try, wife bought me a new 55 LED so this is really just a learning lesson(and to prove that i can fix it lol). Thanks again will post when i get the new board.

[budm]

Re: 42" LG no backlights

Well, we already know you have burnt out component on the board, so we know at least that the board is bad, cannot tell if there are any other problem with other boards on the TV.

[cbriggz]

Re: 42" LG no backlights

found replacement board on ebay for 45 dollars. Do you think that will solve my problem??

[budm]

Re: 42" LG no backlights

That burnt jumper supplies the power to U8. That part has 5 pins, so take the resistance reading between all the pins, with the big tab on top, make the left pin as pin 1, then take the reading between pin
1&2
1&3
1&4
1&5
2&3
2&4
2&5
3&4
3&5
4&5

The transformer you have circle, you will have to do the same resistance checking between all the pins and compare the readings to the one next to it. I did not find the pinout of the transformer yet.
Also look on line for the replacement board.

[gilly1984]

Re: 42" LG no backlights

I better leave it to someone more in the know.

[cbriggz]

Re: 42" LG no backlights

the one spot is not where a jumper is. i circled where it is on the pic. That part also makes a strange noise when i plug in the television. It is the first one on the top of the board. not the one pictured

[gilly1984]

Re: 42" LG no backlights

It may just be that they run quite warm, check for shorts and then patch up where that 0 ohm jumper went. Those other burn marks are where the other larger jumpers are.

It doesnt have to be super hot to make them marks.

[cbriggz]

Re: 42" LG no backlights

what about the other spots i highlighted they look burnt too?? Should i just order a new board?

[gilly1984]

Re: 42" LG no backlights

Just solder a wire across where the component fell off. But make sure there is no bronze showing on the trace inbetween the 2 points to be connected.

EDIT;

As bud said, better check for shorts before patching it up with a wire.

[budm]

Re: 42" LG no backlights

The jumper that burnt up can be due to shorted load (MOSFET, Transformers, etc) or it has cold solder joints (lots of current flows through these jumpers).

[jetadm123]

Re: 42" LG no backlights

Fuses are usually identified with an "F". The component that fell off is identified with "JP", which usually indicates a jumper. The "0" stamped on the component indicates zero ohms, which is the same as having a jumper wire across the two points. What's the resistance reading of the component that fell off?

[cbriggz]

Re: 42" LG no backlights

here is the area that you are looking at on the front side.