samsung ps-r4212 wont turn on

[sdinelli]

power supply: BN96-02213B (PSPF381A01A)
I have 5v standby
and I have 160V at the second fuse, which means PFC is working right?

stby 5v - 4.93V
ps-on is 4.49V
d12V - .734V
d5.3V- .669V
18V- .633V
A12V - .735V
6.5V- 662V
I'm not sure if all those voltages are supposed to be present during standby

ps-on does nothing when I press the power button
power button connector:
5v - 4.9V
power- 2.358V -0V/short to ground when button is pressed, normal?
IR- 3.546V -fluctuates when I press remote

Suggestions please
ive searched for schematics but cant find any.
I have cap and esr meter. some caps are under value but all pretty much with in %10 range

[dskall]

Re: samsung ps-r4212 wont turn on

If ps-on has voltage in standby it will have to be pulled low to turn on power supply. 160v is good for standby voltage. Should go up to 380v or so when powered on.

[maxvalutech]

Re: samsung ps-r4212 wont turn on

Iif absolutely nothing happens when turn on activated then main board suspect. See other recent posts re isolating main and power boards and jumper powerboard on.

[sdinelli]

Re: samsung ps-r4212 wont turn on

If ps-on has voltage in standby it will have to be pulled low to turn on power supply. 160v is good for standby voltage. Should go up to 380v or so when powered on.

Right, ive seen where I can force the ps_on low with a resistor from there to ground

but shouldnt I get some kind of reaction when I press the power button? the PS_ON voltage doesn't come down when I press the button does this indicate that theres something wrong the logic board or the power button?

[sdinelli]

Re: samsung ps-r4212 wont turn on

Iif absolutely nothing happens when turn on activated then main board suspect. See other recent posts re isolating main and power boards and jumper powerboard on.

so all those other connections with <1V, should they be present in stand by? or only when ps is on? obviously I know VA and VS wont be on.

[dskall]

Re: samsung ps-r4212 wont turn on

You should always have a voltage in standby. You may or may not have other voltages depending on design until the mainboard switches them on. If you probe your button connector at mainboard you should have some voltages usually 3.3v one or two should change voltage when buttons pressed

[maxvalutech]

Re: samsung ps-r4212 wont turn on

Normally you can turn set on from standby with either remote or set switch and if neither gives any reaction at pson then main board is suspect. You need to do the actual test to find out if main is ok or not.

[sdinelli]

Re: samsung ps-r4212 wont turn on

You should always have a voltage in standby. You may or may not have other voltages depending on design until the mainboard switches them on. If you probe your button connector at mainboard you should have some voltages usually 3.3v one or two should change voltage when buttons pressed

in the OP I posted the voltages of the power button connector. theres no other buttons but the power and IR.
the power button connects to the main board.

I measured the voltage when I pressed the button and it went from 2.358V to 0V. I tested the button with no power at all and when its pressed it shorts to ground. is that normal?

[sdinelli]

Re: samsung ps-r4212 wont turn on

Welp I forced the power supply on (first time doing that, pretty exciting)

Relay clicked and I got my voltages! VA was on point. VS had no power because I didn't want to mess with forcing that too.

any suggestion for what to look for on the main board?

[dskall]

Re: samsung ps-r4212 wont turn on

Difficult without schematics. May have a fuse or two. Might be able to find some chip numbers and specs for them. Look for possible repair kit for it. No other ideas.

[maxvalutech]

Re: samsung ps-r4212 wont turn on

Even the professionals only work down to board levels these days. Without or even with a schematic it is hard to trace what is where. On the main board from the pson connector point look for obvious problems and test components as best possible back to standby voltage. Or if you can get a main board at a reasonable price ??

[sdinelli]

Re: samsung ps-r4212 wont turn on

Even the professionals only work down to board levels these days. Without or even with a schematic it is hard to trace what is where. On the main board from the pson connector point look for obvious problems and test components as best possible back to standby voltage. Or if you can get a main board at a reasonable price ??

Thanks, il see what I can do.
this tv is over 10 years old not worth putting money into it. shop jimmy had the PS board for 24$ but didn't have the main board. it was listed at like 80$