Samsung PN51E450A1FXZA

[TimT]

Hi Everyone

I have a samsung PN51E450A1FXZA with no picture just a red light when turning the set on. no noise or clicking sound when turning on Tv.

I tested the power board and output seems correct. there are contack points on the sustain's for testing current, and both seem correct.

The logic board has a green light that blinks with 1 second intervals. I am not sure what to test next? I just want to locate the faulty board and replace it.

Any help would be much appreciated!

[Nick's Tvs]

Re: Samsung PN51E450A1FXZA

I had 2 of these sets with similar issues and the x was the problem both times.
When you say you tested the power board outputs, did you jump the board to test VS and Va?
Have you turned the tv on with only logic and main plugged in? Do you get the chim at least from the main that way?

Check transistors for short on the X

[Hamie]

Re: Samsung PN51E450A1FXZA

I'd say y-sustain.
The burn marks a pretty big give away.

[Alastair E]

Re: Samsung PN51E450A1FXZA

Another vote for the Y-Main...

Seen a few dead with S/C IGBT's, and the one pictured is an OLD board with That amount of Cremation!...

[TimT]

Re: Samsung PN51E450A1FXZA

I noticed the burn marks... powered on TV with just the main and logic and got some sound then connected everything back and turned it on again. This time I had a picture??? it would flicker then stay steady. picture just randomly went off & on. sound works find while it's flickering. sustain's hold a steady voltage " at test points " while screen flickers ..strange...

[TimT]

Re: Samsung PN51E450A1FXZA

parts were cheap so I replaced the Y-Main & T-con...no luck also have another main pcb on the way.. Picture still going in/out sound ok. will see what happens with the new Main.

[f67bird]

Re: Samsung PN51E450A1FXZA

You can use the logic board test patterns to let you know more about the main board.
Unplug the tv and disconnect the connector between the power supply and main board on the main board end. Short the brown and second wire away from it (which should correspond to the ps on and gnd legend at the power supply end of the connector) with a bread wrapper tie that has been stripped about 1/4 inch on each end or something similar (these are made from a solid core wire instead or stranded wire which can fray)
Then insert an alligator clip into the top two of the four large holes located at the bottom left side of the logic board. These should be labeled 3 and 4.
Plug the tv back in. If the patterns are bright and constantly change from one pattern to the next without blacking out or flickering... then you have a bad main board.