LG 60PC1D-UE picture messed up

[shelby5041]

Re: LG 60PC1D-UE picture messed up

tom....i believe serv manual wrong on testing buffers

i tested all 4buffers i have and same pins on all 4 had continuity......which i thought was odd....so i did more testing and it appears on each connector therr are 4ground pins ....so you cant rake all pins ..if u look on bottom of board trace compared to top of board you can see which pins are ground....so it appears buffers are not shorted as you stated.

sorry....

[shelby5041]

Re: LG 60PC1D-UE picture messed up

dont know how to run a test pattern.....and i used my neighbors fluke meter and get same results for vsc vsetup

[tom66]

Re: LG 60PC1D-UE picture messed up

Don't think you can on this one...

[mmartell]

Re: LG 60PC1D-UE picture messed up

Main board = a/v input board.

Run the test patterns !

[tom66]

Re: LG 60PC1D-UE picture messed up

It's probably just the interference from the TV driving your meter crazy, you might need a better meter.

[shelby5041]

Re: LG 60PC1D-UE picture messed up

on my cheap multimeter vsc registers out of range on 1000v setting

does not fluctuate

sorry for all questions....just want to fix my tv

[shelby5041]

Re: LG 60PC1D-UE picture messed up

ok testing method per serv manual is wrong

they prob made a typo



thanks

[tom66]

Re: LG 60PC1D-UE picture messed up

Listen to me: Your buffers are not shorted if you have any picture.

You would not have a picture (that is, distinguishable lines, that show parts of an image) if your buffers were shorted.

If your buffers were shorted, your Vsc would be zero, not crazy.

[shelby5041]

Re: LG 60PC1D-UE picture messed up

and i havent tested tv for pucture recently....just been trying to isolate no vsc vsetup issue

it does appear buffers are shorted unless my method of testing is incorrect

[shelby5041]

Re: LG 60PC1D-UE picture messed up

i posted a pic of serv manual page couple messages back..can u verify my buffer testing method is correct?

[shelby5041]

Re: LG 60PC1D-UE picture messed up

i know...but per serv manual test method they are both shorted

i put 1 lead on large floating ground pad and raked pins where rubbon cables connect to.....

is this correct method to test for short?

[tom66]

Re: LG 60PC1D-UE picture messed up

You wouldn't have any pic if your buffers were shorted.

[shelby5041]

Re: LG 60PC1D-UE picture messed up

see pic taken from lg service manual for this model tv

[shelby5041]

Re: LG 60PC1D-UE picture messed up

and i just looked back and tom you stated how to check buffer for shorts and it is exactly how serv man shows

so i have to assume my buffers are both shorted?

[shelby5041]

Re: LG 60PC1D-UE picture messed up

per serv manual buffer test is one lead on floating ground pad on buffer other lead rake pins on buffer

should be no contnuity

does this sound correct?

i just tested my buffers that way and i get multiple shorts

[shelby5041]

Re: LG 60PC1D-UE picture messed up

when u say main do u mean logic control board or a/v input board?

[shelby5041]

Re: LG 60PC1D-UE picture messed up

martelli....i tested all votages per serv manual using test points per manual

martelli.....i get good voltages vsc vsetup only if i disconnect control board power

[shelby5041]

Re: LG 60PC1D-UE picture messed up

tom....the voltages on xsus test good but is there a chance the x is the issue or buffers?

i know u said no before but im trying to cover all possibilities

[shelby5041]

Re: LG 60PC1D-UE picture messed up

well like i said....both vsc and vsetup test out of range if control board is connected

so....

[shelby5041]

Re: LG 60PC1D-UE picture messed up

thanks....i obtained a training manual for 60pc1d

its incredibly detailed.....too complicated for me unless o know what im looking for

i have it in digital format...its about 27mb