60PN5300-UF with 5v on the 15V line?

[football0062]

Have a 60PN5300-UF which i cannot seem to find the service manual for.

The power supply only provides a VS(200v) a VA(60v) and a 5mv(5v) to the z sustain.
Then from the Z sustain we have a connector that jumps over to the Y sustain.

Problem is my 15V line is only producing 5V(5.45v) i have other lg service manuals that show the 15v being supplied from the Y sustain but those models are directly connected to the power supply, which in this model it is not.

anyone know the source of the 15V on this model?

[football0062]

Re: 60PN5300-UF with 5v on the 15V line?

The 15V is actually produced on the Y sustain still and is sent to the Logic(which i dont believe the logic board uses) and Z sustain board.

The problem was that one of the buffer IC's had gone bad causing excessive load on the y sustain. luckily i had the correct IC around and replaced it. Tv is now working perfectly.

[tom66]

Re: 60PN5300-UF with 5v on the 15V line?

Good fix, BTW 5mV = 0.005V not 5V.
Make sure it doesn't fail again. Known fault on some late model LG plasmas is bad panel ribbon causing failed Y-buffer.

[Peter Chiu]

Re: 60PN5300-UF with 5v on the 15V line?

Really ! I will quickly order for spare parts (IC251 R2A20299FT)

I don't understand, u didn't have ( BGA rework station with Optical Alignment System). How could u solder so neat !!! Am I talk to a robot???

[football0062]

Re: 60PN5300-UF with 5v on the 15V line?

im sorry i meant M5V not 5mv, as labeled on the board. i know the 50" panels go bad because of the cable being so close to frame screw and have already had to scrap 3 unit due to that. but this 60" model looks ok. a little more space.

just used a hot air gun from hardware store and no clean flux paste and my weller PES51 with a ETS tip. oh and a 10X loupe

[football0062]

Re: 60PN5300-UF with 5v on the 15V line?

by the way here is the service manual for this model, it popped up today.

[Peter Chiu]

Re: 60PN5300-UF with 5v on the 15V line?

Thank you for your Tips , Indeed.
TQFP 100 Pins ICs ,they use robot to put in place and solder the IC chips.. I mean you as good as robot .Hop! you don't misunderstand,My Apology!
This is the best investment I ever made, before I use paint-strip-Killer-heat-gun.
http://www.ebay.com/itm/852D-SMD-Sol...item19fc5d5211