LG 42LD550 Won't turn on

[selldoor]

Re: LG 42LD550 Won't turn on

Just wondering if you have tried pressing the green button - think it is a reset switch.
As you are talking replacement then maybe worth trying.

[capndirk]

Re: LG 42LD550 Won't turn on

I have the exact same TV with the same problem as the OP. My TV was a refurb originally, and when the problem developed (8 years later), I opened it up and found all the board screws quite loose, as in 2-3 turns. The main board has arcing and sparking evidence on the solder patches on the underside at the mounting holes meant to make contact with the metal shroud. There is no other evidence of faults, and securing the boards didn't fix it. So, I'm thinking the intermittent ground scrambled the on/off circuit processor. The green button, incidentally, is a manual on/off switch, not a reset.
The on/off circuit works to a point; that is it turns off the "ready" LED momentarily, then flashes red, which must mean error, since on is a steady blue. The connector for the blue LED doesn't read power in the on mode. The switches or remote will turn the TV off to "ready" mode, again.
All the tests done by the OP are the same on this one, except I didn't try jumping the "inv on" terminal.
Any tricks to bring the thing back?

[doug6644]

Re: LG 42LD550 Won't turn on

Anymore info gathered, or did this get dropped?

[budm]

Re: LG 42LD550 Won't turn on

Anymore info gathered, or did this get dropped?

Are you having the same exact problem (no BL-ON) as the OP or something else?

[JDMugenBB1]

Re: LG 42LD550 Won't turn on

following... my father in law was given the same TV and no picture no sound... just red blinking stand-by light.