Samsung BN44-00506A power board dead no standby

[fantoms]

Re: Samsung BN44-00506A power board dead no standby

hello,
I do not want to start new thread and I will continue writhing in this because I have a problem with BN44-00506A too.

The T27B551 is starting and working well for about 30-60 minutes and after that it is starting to restart in cycle. I can see the samsung logo while restarting and that's all.

I opened the TV and sow that under the NT801S there is a burned mark.
I would like to replace NT8001S but not sure with what exactly. Please help.

I am attaching board pictures.

[diif]

Re: Samsung BN44-00506A power board dead no standby

You have several dry joints, resolder them.

[vinceroger69]

Re: Samsung BN44-00506A power board dead no standby

like diif says atart by reflowing every joint on the power supply there are a few dry Joints visible (looks like a bad one on the bridge rectifer just to point out one.)
I have just fixed a constantly re starting samsung by just refowing the entire power supply.

[fantoms]

Re: Samsung BN44-00506A power board dead no standby

OK. Thanks.
I resolder the rectifier, transformers and other suspicion joints.
What about NT8001S. I think it has a crack and prefer to change it.
It gives me 25k at 20 oC. Is that correct?

[lotas]

Re: Samsung BN44-00506A power board dead no standby

This is already a high resistance, should be in Om. need to replace it.

[fantoms]

Re: Samsung BN44-00506A power board dead no standby

Just to clarify I spoke for NT801S not NT8001S
My mistake.
Could you give me a clue which part to use for replacement.

EDIT: I found it: SCK-053

[vinceroger69]

Re: Samsung BN44-00506A power board dead no standby

the thermistor could possibly be a
NTC 5D-15, 5 Ohms @25c, 15 mm Dia. 6A max steady current, 0.156 Ohms @max current @25c