lg 42lv450u clicks will not turn on

[adamp91gvm]

I have this lg tv narrowed it down to the av board basically i get a click then red light flashes then the light goes white then clicks again and goes back red this tv was doing this a while back and all i did was press the av board and it came on and stayed on for about a week im still a learner to fixing but i want to learn anyone any ideas where to start with the av board help is appreciated thankyou in advance

[adamp91gvm]

Re: lg 42lv450u clicks will not turn on

Any help guys ?

[Andrew F. Ali]

Re: lg 42lv450u clicks will not turn on

Look fro loose connections and cracked solder joints.....Cold solder joints are the usual cause for this symptom......The Main Chip is usually the culprit....had this problem a couple of times and never solved it....I just bought replacement boards........

[adamp91gvm]

Re: lg 42lv450u clicks will not turn on

I can not find replacement boards for this tv

[ReeceyBurger123]

Re: lg 42lv450u clicks will not turn on

Epprom failure is very common on these sets.

[spintop]

Re: lg 42lv450u clicks will not turn on

have u try the heat treatment, baking.
google it u can find some people have success on LG tv.
do it at your own risk. i have never tried it myself.

[adamp91gvm]

Re: lg 42lv450u clicks will not turn on

Tried it worked for a few days but then stopped

[ReeceyBurger123]

Re: lg 42lv450u clicks will not turn on

That possibly means that there is a failed BGA solder joint. Have you got a heat gun ?

[adamp91gvm]

Re: lg 42lv450u clicks will not turn on

Yer been over it a few times with it no joy

[tom66]

Re: lg 42lv450u clicks will not turn on

Zapping a BGA with a heat gun is rarely a reliable repair method. It needs a reball and reflow.

You'll find that hot-air reflowed BGA boards will usually come back a few weeks later with an upset customer.

[ReeceyBurger123]

Re: lg 42lv450u clicks will not turn on

I have had fairly good luck Tom with a heat gun and a heat plate tbh did one about this time last year that had bars on the screen when on it was failed BGA on the main CPU reflowed it using the hotplate and heat gun been fine since.

[ReeceyBurger123]

Re: lg 42lv450u clicks will not turn on

Its a hit or miss if you reflow with a heat gun it carefully by preheating then increasing the temp it should be fine.

[spintop]

Re: lg 42lv450u clicks will not turn on

i believe applying "no wash" flux is important to have proper bonding when reflowing. i have used a heat gun on a LG tv bga chip before, but it didnt resolve the issue. mine could be a faulty eprom or nand flash.

[adamp91gvm]

Re: lg 42lv450u clicks will not turn on

Has any one ever tried replacing the eprom

[ReeceyBurger123]

Re: lg 42lv450u clicks will not turn on

I have and the set worked you can buy them for £2 a piece for this board will see if I can find you one.

[adamp91gvm]

Re: lg 42lv450u clicks will not turn on

Any joy ?

[ReeceyBurger123]

Re: lg 42lv450u clicks will not turn on

Sorry mate couldnt find where I got them from.

[antas]

Re: lg 42lv450u clicks will not turn on

Same model and same issue here. Reprogramming of IC103 can sort out this problem?
Any ideas, please?