BN44-00482B makes some arcing noise

[disorder]

hello guys,

need some advice here, for a BN44-00482B samsung power board
the tv works normaly but we can here a noise comming from the power board.
this noise is not permanent, seems like some arcs, but there is no arcs really.

this noise comes from the bottom left of the board near the AC connector.

and most likely from tha capacitor just after the rectifier, it is marked : 2W 474K sic 610S on it, a plastic capacitor 450V/474nF.

if i press on it, the noise change, sometimes more higher and sometimes disappears. if i stop the presure, the noise is steady.

the noise not change if i press filters at the same place.


do you think this caps is near dead ?
not so easy to find the same in the shop, i've got only 450V/684nF capacitor from other board (that they are after the rectifier too on the circuit)

thank you guys :-)

[nomoresonys]

Re: BN44-00482B makes some arcing noise

I'd try that replacement cap, see if it goes away.

[dick_barton]

Re: BN44-00482B makes some arcing noise

Check the solder joints in that area. If you have an insulated rod then you could put pressure around that area to see if you can determine the exact spot. It may be something on the underside of the board.

[Duranitron]

Re: BN44-00482B makes some arcing noise

try to resolder the inductor coils near that noisy thing. hope it solves the issue

[disorder]

Re: BN44-00482B makes some arcing noise

hello

finally solve this. you're right : solder joints were bad, making some circles in thin. many of them
so i resoldered all of this crappy ones, and now the TV don't cry anymore !!

thanx guys !

[nomoresonys]

Re: BN44-00482B makes some arcing noise

Glad to hear it, yep, solder joints should usually be checked first, easy to do and don't cost anything and can save a shitload of unnecessary further troubleshooting.

[Duranitron]

Re: BN44-00482B makes some arcing noise

Good Job!