Samsung LED TV UE40C5100QWXXU

[dynomo]

Both ceramic T6.3AH fuses open circuit just as mains enter the board.. No shorts found, rectifier ok.

PSU BN44-00353A

[tom66]

Re: Samsung LED TV UE40C5100QWXXU

Is this a question or successful repair?

[dynomo]

Re: Samsung LED TV UE40C5100QWXXU

I have found the problem. Found 8.5k ohms across bridge rectifier + - which was incorrect. After some investigation found CP818 / 100pf at 1KV burnt on the side

[tom66]

Re: Samsung LED TV UE40C5100QWXXU

8.5kohm would not blow a 6.3AH fuse, though it would get very hot very quickly.

[dynomo]

Re: Samsung LED TV UE40C5100QWXXU

8.5kohm would not blow a 6.3AH fuse, though it would get very hot very quickly.

It blew both ceramic 6.3 fuses in the primary. Replacing the fuses and cap and tv is running fine again. Of course powering up a very burnt cap can load the circuit much more. I suspect it went dead short in reality. I would agree with you 8.5k would not take the fuse out on its own as there would just not be enough current drawn. I have edited the post to be alittle clearer.

Alls working well now so alls good.

[tom66]

Re: Samsung LED TV UE40C5100QWXXU

Perhaps it was a non-ohmic short, i.e. 8.5kohm under 0.3V that your meter uses but only a few hundred at full 325Vpk mains voltage. Glad you got it fixed. I'm on the look out for an LED TV to fix... still haven't got done one...

[dynomo]

Re: Samsung LED TV UE40C5100QWXXU

Perhaps it was a non-ohmic short, i.e. 8.5kohm under 0.3V that your meter uses but only a few hundred at full 325Vpk mains voltage. Glad you got it fixed. I'm on the look out for an LED TV to fix... still haven't got done one...

Hi Tom,

Yep that's whats happening here I would guess. Under rectified mains the cap would of got pritty pissed off. Was a lump burnt out the side of it. I found this 40 samsung on Gumtree locally. Gumtree has some good bargains at times. Most tv repair companies round here want silly money just to take the back off these days. So I get quite a few good bargains.

[tom66]

Re: Samsung LED TV UE40C5100QWXXU

Yeah, Gumtree has gotten me quite a few bargains, but there's some more significant competition round here, nothing too bad though.

[DemonBG]

Re: Samsung LED TV UE40C5100QWXXU

Hey Dynomo,

Sorry to revive a dead thread but what symptoms did this board have before you repaired it? I have a similar board at the minute and the only sign of life out of the TV is a blinking LED...

[mmartell]

Re: Samsung LED TV UE40C5100QWXXU

Start a new thread. In the mean time disconnect the cable from the PS to main board and plug set in. Do backlights come on and stay on ? If so, suspect main board . If not check power supply and/or backlight system.