Identify LG Plasma 60PK550 Part

[happyade123]

Hi all a bit of a longshot, but I thought I would try all the knowledgable people on here first before giving up and trashing the tv.
There is a blown component on the bottom of the Power supply board. It appears to be a surface mount transistor. It has the board position number of Q703
It was blown to bits so I removed it but the other two around it have the marking NC 12 on them but I can't seem to find any datasheet or substitute for them.
For your interest the Tv is the LG 60PK 550 and the power supply number is PCB :EAX61432501/7 and PSU P/N:EAY60968901.
Maybe someone has one in their junk pile and can either identify the part or sell me the part or point me to a replacement.
I have included pics but my phone does not take the best pics but hopefully they will be ok.

[R_J]

Re: Identify LG Plasma 60PK550 Part

I cant see why this transistor would blow unless someone aapplied the wrong voltage to RL_ON pin
I'm not 100% but it could be a mmbt2222a (npn) transistor, I checked a couple other LG board schematics to see what they used in that position.

From the RL_ON pin of the plug it goes to R747 then to Q703 base, there is also R750 from base to ground, Emitter is connected to ground, Collector has R711 (10k) to +5 volts, R715 (2.2k) to ic & R716 (100k) to ground

[happyade123]

Re: Identify LG Plasma 60PK550 Part

Your a champion RJ and this transistor was blown when I first got the tv but I never noticed it as I was chasing components on the top of the board (Big mistake).

[happyade123]

Re: Identify LG Plasma 60PK550 Part

RJ Cant find the second R 715 assuming its a misprint value 100k to ground. pls clarify.A copy of the circuit you used would be very helpful.

[R_J]

Re: Identify LG Plasma 60PK550 Part

That should have read R716 (100k)
I was using this schematic for a eay60968801

[happyade123]

Re: Identify LG Plasma 60PK550 Part

Thanks RJ I owe you one.

[happyade123]

Re: Identify LG Plasma 60PK550 Part

R J do you have any ideas on what else could be wrong with this tv. I have replaced that surface mount transistor but the tv still does the same thing. The relays give 2 clicks followed by one more click . I am leaning heavily towards the submicom, but there could still be components I have overlooked.