Samsung ps42a457 showing bad image

[Liam.25]

First check
Vs should be 205, it's at 150
Va should be 54 it's at 41

Unplug x main and y main

All voltages are perfect out of psu

If I plug either boards in, I get the above incorrect voltage

Usually only 1 board has caused this

Does it mean x and y main are both bad??

[Liam.25]

Re: Samsung ps42a457 showing bad image

No x and y connected
Vs205 va54

Just with x
Vs154 va43

Just with y
Vs146 va41

With x and y
Vs140 va39

[Liam.25]

Re: Samsung ps42a457 showing bad image

Anybody??

[freakaftr8]

Re: Samsung ps42a457 showing bad image

I would look into power supply area. Somethings wrong in the high voltage output section. It has no problem outputtinng the supply but once put under a load it looses its ability to keep up. Look to capacitors being the prob. Any swollen or bulged?

[tom66]

Re: Samsung ps42a457 showing bad image

Could be film cap on primary side going bad too.

[freakaftr8]

Re: Samsung ps42a457 showing bad image

Could be film cap on primary side going bad too.

Agreed, I had a 42" AKAI plasma with a mylar film cap go bad.. Changed 6 of them.

These are red or orange in color or green with 2 leads off the bottom.