Samsung PN43F4500BF won't turn on, no std-by light

[bfordz]

Our Samsung PN43F4500BF plasma TV has died and I'm trying to figure out if it's worth saving.

It has power to it, 121v/ac; the fuse tests good, .3ohms; I tested the voltages on the two connectors coming off the psu and this is what I got:

Stby=5.33, ps_on=4.48(connected) 5.33 (disconnected), 3-B15v=0, 2-B5v=0.

2-vs=0, nc=0, va=0, B15v=0, B5v=0, 2-vs_on=0, ps_on=4.48 (connected) 5.33 (disconnected).

** I tested the voltages with the connectors connected and disconnected. Unless there was a change(noted) voltages stayed the same.

All the capacitors look good, flat and dry, so no physical sign of being bad.

Suggestions as to what to do next?

[Hamie]

Re: Samsung PN43F4500BF won't turn on, no std-by light

Disconnect mainboard.

Jump power supply on

Ps-on to Gnd
Vs on to stby.

Jumper pins 3&4 on control board.

If set runs test patterns you have a bad mainboard.

[bfordz]

Re: Samsung PN43F4500BF won't turn on, no std-by light

Hamie,
Thank you for your reply;
Just so that I'm clear (first time working with plasma tv), referencing my pic.

I labeled what I think are the correct boards.

I'm going to disconnect the main board at connector/cable #1.
I'm going to jump ps_0n to gnd at #1
I'm going to jump vs_on @ #2 to stby @ #1

Jumper pins 3&4 @ #3 on Control board.

Do I need to disconnect the ribbon cable from Main board (#4) to control board?

[bfordz]

Re: Samsung PN43F4500BF won't turn on, no std-by light

update to testing:

I corrected my jumpers (from what I "thought") for the Control Board 3 to 4 (see pic).

My TV went through it's self tests, so as Hamie stated I must have a bad Main Board (it's been isolated from the rest of the system)

and yes I disconnected the ribbon cable #4 in my previous pic.

Thank You very much Hamie!

[bfordz]

Re: Samsung PN43F4500BF won't turn on, no std-by light

I replaced the 'mainboard' and we're back up and working!

Another big Thank You to Hamie!

[Hamie]

Re: Samsung PN43F4500BF won't turn on, no std-by light

Nice one thanks for the feedback.