samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

[Lloyd6202]

Alright i need help and a walk through for this repair..cause the board is damaged and im not quite sure where conections go and meet heres a pic and all parts have arrived

[diif]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

You need to remove all the burnt PCB first.

[Lloyd6202]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

Ok i have a dremel to grind out damaged areas

[tom66]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

That board is dangerously close to being unrepairable.

Because that is on the mains side, you have an arcing risk.

You need to remove all carbonised material and ensure that the live, neutral and earth terminals are all sufficiently isolated from the damaged material first.

[Lloyd6202]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

Yes i do realize there is alot of damage would i be better off just cutting a square hole. And then patch it

[tom66]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

First try to remove as much carbonisation using isopropyl alcohol or acetone (careful on the silkscreen print marks as acetone will remove them, component identifiers etc).

Then use a bit of sandpaper to take anything else off that is left

I wouldn't recommend cutting parts out, because then you'd have no way to support the replacement bits.

With this level of damage I'd seriously consider ordering a replacement PSU because you may never be able to safely repair it.

[Lloyd6202]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

Ya i think thae worst case senario is it wont work but the best case scenario is all works well and it was cool learning experience...i waited on these parts for almost two months now. So hang out with me and advice is always good...im gonna start this tommorow night

[martino]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

Hi,
Is that a BN44-00183A? I can check tomorrow if I have one of those kicking around.

[R_J]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

If it is the BN44-00183a, here is the schematic
The area that is burnt is where the 2 thermistors get connected in series, should'nt be too difficult to connect them together above the burt area.

[Lloyd6202]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

Sweet thanks for the schematic and yes if u do have that board kicking around can u sen me pic of both sides of board

[Lloyd6202]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

That might work i was just gonna fill in with epxoy and copper then heat tape redrill hole and thats that i think

[Lloyd6202]

Re: samsung pn58a550s1fxza thermistor and relay repair...oh and burnt pcb

All good shes up and running boy thanks again