LN40C630K1FXZA wont turn on

[Catman5775]

I have an LN40C630K1FXZA and it is not turning on, but when I disconnect the cable between the power board and the main board the backlite comes on, that is the only activity I get other than the red lite being on , Thanks for your help.

[budm]

Re: LN40C630K1FXZA wont turn on

That means the problem is in the Main board. Upload good clear pictures of the main board.

[Shinju]

Re: LN40C630K1FXZA wont turn on

630,640 and 650 have notorious mainboard issues, if you connect the mainboard back up and I believe this unit has a network Ethernet port if you see he yellow light flash when the unit is trying to post boot the. You have a bad CPU. I just went through this with a ln46B640.

The CPU doesn't have a good bond to the heat sink in some board revisions and they cook themselves.

[Catman5775]

Re: LN40C630K1FXZA wont turn on

So normally replacing the main board corrects this problem ? Thanks

[Shinju]

Re: LN40C630K1FXZA wont turn on

I don't know, you will need to check your ps voltages, what I found was for mine but I have had a few 630 and a 650 both needed mainboards, one of the 630s needed a ps too.

[Catman5775]

Re: LN40C630K1FXZA wont turn on

Thanks for your help. I checked power in at my plug,had 120v. Checked both fuses and were good. I also checked and found my 2 yellow capacitors ,both went from 130 volts on standby to 430 os so after I pushed on with the remote