LG 60PG30 bottom third no picture

[martino]

I have 3 of these tv's,all have the exact same problem,bottom third of the screen is black.

I'm a bit lost here,as my thoughts go to the lower buffer board as a suspect.
But that's where the fun starts.

When I follow on screen where it stops displaying,I end up halve way the middle buffer IC. (see pic#3,I marked it). As far as I figured,the data signal goes from top to bottom?

I sacrificed one of my lower buffer boards as the donor.

I have replaced the middle IC 3 times now,with donor IC's,as I was doubting my solder skills.But it still doesn't display the bottom third of the screen. I tried the "repaired" board on two tv's with the same result.

Am I wrong in thinking it is the middle IC? Any one had this before?

[chrismurphy]

Re: LG 60PG30 bottom third no picture

check for a blown surface mount resistor on the buffer board

[martino]

Re: LG 60PG30 bottom third no picture

Hmmm,good point.Been so focused on the IC's that I never even thought about that.

I did forget to mention that I could not measure a short from floating ground to the ribbon cable connectors.

Will check the smd's ! thank you