BN44-00517C dead - blown cap, resistor and fuse

[bobby4star]

Hi All,
I have a UE32ES6540 which is dead, customer reported a pop and a puff of smoke. PSU is BN44-00517C and has blown 221k 1KV cap, next to this a blown resistor RM811. Board mains fuse is blown.
Has anyone seen this problem and will changing the cap, resistor and fuse likely fix it? One more ask, can anyone give me a 2nd opinion of this resistor rating of RM811? I think it's 0.24 Ohms but would like a 2nd opinion! See attached pic.

Thanks!
Bob

[budm]

Re: BN44-00517C dead - blown cap, resistor and fuse

Very common problem for those snubber ceramic cap to short out like that, it is connected in parallel with Source and Drain pin of that MOSFET, so when the cap shorted out it will usually take out that Source resistor with it, you still should check the MOSFET to make sure it is also not shorted out either, you also need to check the bridge rectifier to make sure it is also still OK.
That flame proof resistor is 0.24 Ohms.
The cap should be replaced with 2KV rating instead of 1KV as original is rated at.
You may be as lucky as this guy, anupkg1985, in this thread here:
https://www.badcaps.net/forum/showth...ht=snubber+cap

[bobby4star]

Re: BN44-00517C dead - blown cap, resistor and fuse

Hi budm,

Thanks for your message, i will check for shorts on the fet, yes i have some 2kv caps as change these quite often on sone of the older 32" boards that come in to me. Thanks for confirmation on the resistor, i will order sooner if those in. Will confirm if the repair works! Thanks Bob

[bobby4star]

Re: BN44-00517C dead - blown cap, resistor and fuse

Hi, do you reckon that will be a 2w or 3w resistor? Cheers! Bob

[dazzystar]

Hi,

I know this is an old thread but I'm hoping someone can help. I'm also having the same problem with my BN44-00517C board. The cap and resistor I have ordered but I have no clue what the MOSFET model is. Can anyone help?

Cheers
Daz

[diif]

Hi,

I know this is an old thread but I'm hoping someone can help. I'm also having the same problem with my BN44-00517C board. The cap and resistor I have ordered but I have no clue what the MOSFET model is. Can anyone help?

Cheers
Daz

The MOSFET should have some markings on it.

[dazzystar]

Thanks so much for the reply. The MOSFET is completely blank. I've looked at a YouTube video of a similar Samsung TV PSU board and the MOSFET there is a 10NM60N so I've ordered one from ebay. Let's hope with that, a new cap and resistor it'll work!

[lotas]

Don't forget to replace the SSC2S110 PWM and check its wiring (smd resistors, stabilizer bars, diodes...)

[EazyBone]

Re: BN44-00517C dead - blown cap, resistor and fuse

Very common problem for those snubber ceramic cap to short out like that, it is connected in parallel with Source and Drain pin of that MOSFET, so when the cap shorted out it will usually take out that Source resistor with it, you still should check the MOSFET to make sure it is also not shorted out either, you also need to check the bridge rectifier to make sure it is also still OK.
That flame proof resistor is 0.24 Ohms.
The cap should be replaced with 2KV rating instead of 1KV as original is rated at.
You may be as lucky as this guy, anupkg1985, in this thread here:
https://www.badcaps.net/forum/showth...ht=snubber+cap

Why would 2kv be better to put here? Wouldn't that change something ? Am asking for future repairs. Cause I just don't understand them yet, I always replace with same one

[dazzystar]

Got to change that as well? That's not gonna happen...looks like the bin for the TV then.

[nomoresonys]

Why would 2kv be better to put here? Wouldn't that change something ? Am asking for future repairs. Cause I just don't understand them yet, I always replace with same one

It can handle more, lots of times the makers are using the cheapest lowest capacity components they can get away with and they go bad and blow up pretty easily, so going up in voltage on caps is usually recommended for that extra headroom.

[nomoresonys]

Got to change that as well? That's not gonna happen...looks like the bin for the TV then.

Aren't there any cheap powerboards on ebay, sometimes they are pretty reasonable. But being a 32 it might not be worth messing with, unless you have a need for a 32 somewhere.

[dazzystar]

Yeah. 32" was for our bedroom. Can't find any of the same PSU boards anywhere in stock in the UK ATM.

[dazzystar]

It's a BN44-00517C by the way.

[nomoresonys]

I saw this: https://www.buyqual.com/pd32b1d-csm-...wer-board.html

[EazyBone]

Got to change that as well? That's not gonna happen...looks like the bin for the TV then.

Just change the things that are broken. Fuse/cap/mosfet. And try it since you ordered it already.

[dazzystar]

will change the broken parts and give it a go. cheers guys.

[lotas]

will change the broken parts and give it a go. cheers guys.

If you do not replace the SSC2S110 PWM, then the first time you turn it on, the mosfet and fuse will burn out again...

[dazzystar]

well then it will definately go in the bin after that!

[diif]

well then it will definately go in the bin after that!

Why not replace the SSC2S110 whilst you're replacing the other components ?