LG 47LW5700 video issue

[ajshoe]

Have a LG 47LW5700 that has a solarized picture when turned on. Is this the main board - needs to be heated or solder re-flowed ?

[dskall]

Re: LG 47LW5700 video issue

Is t-con integrated in mainboard?

[ajshoe]

Re: LG 47LW5700 video issue

I'll open it up and post pics. thanks

[Davi.p]

Re: LG 47LW5700 video issue

This happens for about 2 reasons, 1. bad gamma control on tcon, 2. wrong panel setting in main board, so first must access the service menu with a service RC, access it with IN-START, then make a full reset with IN-STOP.

[ajshoe]

Re: LG 47LW5700 video issue

got tv from orig owner who did not open or play with settings. don't think parameters were ever touched. try to open it up tommorrow. will post pics. several posts have baked main board in oven and it fixes it. how long ???

[Davi.p]

Re: LG 47LW5700 video issue

it's not cautional to bake it, the settings can be polluted by little spike from AC, that is much common and is more and more common with this season and the hating air conditioners working..

[ajshoe]

Re: LG 47LW5700 video issue

when set turns on from cold - solarization is very noticeable. after set warms up - much less solarization

[Davi.p]

Re: LG 47LW5700 video issue

in this case can also be a processor soldering..

[ajshoe]

Re: LG 47LW5700 video issue

thanks Pee. You were correct as I heated main proc up to 350 F with some paste and it works perfectly now (removed heat sink first). been running for hours now.

[Davi.p]

Re: LG 47LW5700 video issue

stupido teppista..

[diif]

Re: LG 47LW5700 video issue

thanks Pee. You were correct as I heated main proc up to 350 F with some paste and it works perfectly now (removed heat sink first). been running for hours now.

Let it cool down and test it again. I have my doubts 350F has done much.

[dskall]

Re: LG 47LW5700 video issue

I think what happens is heating and flux removes oxides that temporarily make contact again but will fall after a while.