Samsung PS50B530S2W

[speedypro]

The relay, if it is, keeps getting damaged when tv in on for few minutes. As if high current is going to it. See pictures:









I have bought a new board, worked for 20mins then the same issue as old board (in pics).

[speedypro]

Re: Samsung PS50B530S2W

Any one can help me out??

[ReeceyBurger123]

Re: Samsung PS50B530S2W

Thats not a relay its a Polly cap think for the Vs voltage probably means Vs fets are short. Do you have a DMM and do you know how to check for Short Circuit ?

[tom66]

Re: Samsung PS50B530S2W

Did you replace that capacitor?
You may not have used the proper pulse DC rated cap. It is important that you don't just use an X-cap from a power supply, or otherwise.

[speedypro]

Re: Samsung PS50B530S2W

Thanks for the reply! I have not changed anything. I have two boards: the original with same part burnt. Ordered a used board from ebay, it worked for few minutes then after it cuts out. Looking the board, it has the same as original. Is the transformer causing it?

[speedypro]

Re: Samsung PS50B530S2W

Did you replace that capacitor?
You may not have used the proper pulse DC rated cap. It is important that you don't just use an X-cap from a power supply, or otherwise.

Looking at the schematics, the burnt cap is: 68nF / 1250V

[tom66]

Re: Samsung PS50B530S2W

That cap does go bad on some of these sets. I would try replacing it. Use an SMPS high pulse DC rated polyester capacitor.

[speedypro]

Re: Samsung PS50B530S2W

That cap does go bad on some of these sets. I would try replacing it. Use an SMPS high pulse DC rated polyester capacitor.

I can only this from the UK: http://www.chsinteractive.co.uk/elec...-rm-37-5mm.htm

[ReeceyBurger123]

Re: Samsung PS50B530S2W

I had it on a Ps50c450 where Vs fets were short. Were blowing that cap. Check them before blowing another cap.

[speedypro]

Re: Samsung PS50B530S2W

I had it on a Ps50c450 where Vs fets were short. Were blowing that cap. Check them before blowing another cap.

Yes I have found the shorted fet: EN210A. Need to find a UK supplier.

[ReeceyBurger123]

Re: Samsung PS50B530S2W

Yeah thats probably whats killing that cap have you also checked the gate driver circuit ?

[flocko]

Re: Samsung PS50B530S2W

The EN210A is a 100v 10A TO-220 schottky diode full part number FMEN210A should have no problem finding them digi-key list them so would RS I think

[speedypro]

Re: Samsung PS50B530S2W

Ok I have replace the FET with a new one we've got, resoldered the 'almost damaged cap' but it still burns on that same pin. Done few research as I feel as though those caps can 'age'.

I'll wait for the new cap and report back if same problem.

Thanks.

[ReeceyBurger123]

Re: Samsung PS50B530S2W

What do you mean almost damaged ?

[speedypro]

Re: Samsung PS50B530S2W

Those pictures are of the first board. The second board, bought off ebay, the cap pin burnt only to cause 'cold solder'.

[speedypro]

Re: Samsung PS50B530S2W

I have replaced the polly cap and all seems ok. But I know the tv works.




I've used my heat glue gun to fit it nicely.