Samsung UE40C5100QWXXU Solved !

[dynomo]

Samsung UE40C5100QWXXU

I have one of these in for repair. Set was dead. Check the PSU over which is a BN44-00353A . Both fuses on the mains input FS801s and FS802s T6.3A rating both blown but no short found? Rectifier all ok. I have not change the fuses just yet incase anyone knows something I don't  

[imran khan]

Remove fuse and Place 200 watt lamp on it and see the result.

[dynomo]

Remove fuse and Place 200 watt lamp on it and see the result.

Yep thats one way to do it . I am old school, see a 6.3 amp fuse going out and something is normally a miss for sure. I expected to see a good short somewhere,  but find nothing.  

2 fuses blown top left of board.

[imran khan]

Place a test lamp and see the load

[jordan]

SM

[dynomo]

SM

Thankyou Jordan ! Much Appreciated.

[dynomo]

SM

Thanks to Jordan posting the schematic I have found the problem. Found 8.5k ohms across bridge rectifier + - After some investigation found CP818 / 100pf at 1KV burnt on the side. I guess under rectified mains the caps resistance was only a few Ohms. Enough to take out the 6.3amp fuses.

Thanks Jordan !

[imran khan]

You are a most respected for me but I am really surpriesd  your eye test level of circuit board is very weak.This was a basics of repair and you should upgrade your skills.

[dynomo]

You are a most respected for me but I am really surpriesd  your eye test level of circuit board is very weak.This was a basics of repair and you should upgrade your skills.

Charming, thanks alot. Not the easiest thing to always spot when your eyes get tired.

[chrisantony]

You are a most respected for me but I am really surpriesd  your eye test level of circuit board is very weak.This was a basics of repair and you should upgrade your skills.

Charming, thanks alot. Not the easiest thing to always spot when your eyes get tired.

You should of gone to specsavers....I take it Imran, you have never missed a blown component, I wish I had a £1 for every blown/burnt component I missed after looking boz-eyed for 15-30minutes.

And sometimes...just sometimes, if you have a major short on a SMPS and the usual suspects (Fets, Bridge, etc) have not SC'd then it can be a "b***ox" moment, fair play to you Dynomo, some people dont even bother about schematics/component level repair, they would of been on flebay ordering a new board.

[dynomo]

You are a most respected for me but I am really surpriesd  your eye test level of circuit board is very weak.This was a basics of repair and you should upgrade your skills.

Charming, thanks alot. Not the easiest thing to always spot when your eyes get tired.

You should of gone to specsavers

Problem is I do go to spec savers LOL.

Eyes are not great after 25 years of electronic fun  
I missed this burnt component. Problem was you looked at it from above and from one side it looked fine at a quick glance.

Good job I did not try Imrans 200 watt lightbulb trick. Would of blinded myself with all that light. 

[marky mark]

Imran wants us to all go to his forum, it's the one with the log in problems & bad grammar. Imran, if you upgraded your skills that wouldn't happen, you also might not of put yourself as being from Luxembourg when you registered here.

[chrisantony]

Imran wants us to all go to his forum, it's the one with the log in problems & bad grammar.

And breaking copyright laws on every level...Jestine Yong isnt going to be a happy bunny when he sees his ebook being given away for free.

[dynomo]

Imran wants us to all go to his forum, it's the one with the log in problems & bad grammar.

And breaking copyright laws on every level...Jestine Yong isnt going to be a happy bunny when he sees his ebook being given away for free.

I did look at his book, seems quite basic stuff. I wondered too about copyright.  

[jimca007]

If anyone wants a copy of these " guides " copyright not withstanding drop me an email and Ill point you to the free torrent download containing all the books in one hit I downloaded them and they're ok for something to read on a wet weekend !