LG Plasma 50PC1DR- Y-SUS Issues

[tw2005]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Those lines look the same as what I had after re=installing a buffer board. Turned out to be dirty or bad connection. I removed the board and blew the ffc ribbons and connectors out with a can of air. Reseated the ribbons and my problem was fixed.

I'm thinking maybe logic card or main board for that funky picture. I would not play around with the bottom buffers. The picture looks good then goes weird but the briightness looks ok.

I think the panel is being driven correctly.

I think I read somewhere about rubbery heat blocks going off with age behind those logic boards causing faults but I've only worked on the 2 50PX5D.

Bad LVDS connector, bad joints?

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

you guys rock !!!

re-seated all of those flat cables (just rubbed them with my finger and put them back in.. and voila, no more lines. the flat cables on the control board..

argh..problem re-appeared after putting back together.. so again its a bad connection somewhere

[tw2005]

Re: LG Plasma 50PC1DR- Y-SUS Issues

you guys rock !!!

re-seated all of those flat cables (just rubbed them with my finger and put them back in.. and voila, no more lines. the flat cables on the control board..

argh..problem re-appeared after putting back together.. so again its a bad connection somewhere

I'd avoid using fingers and leaving oily residues which may promote corrosion

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

ok, well i know it's a bad connection but i don't know where !!!!

if the tv is laying on the floor, picture is pretty good.. if i put it back on the stand, which adds pressure somewhere on the screen i get the lines... its constant

its pretty hard to find where there's the bad connection, been messing with it for 2 hours now !!!

i 'think' it's at the bottom of the tv but its very hard to find out :/

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

update.. with the tv upside down, when i press with my palms on the bottom (all across the width of the tv..) i get the lines to display on and off. so it's really at the bottom

is there any connection tabs there that could be loose ?

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Yes, tab bonds like LCD. I can't see your pic??

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

here is a video of what it does with the tv upside down :

http://www.youtube.com/watch?v=hJSdggDVpGs

i really cant figure out what causes that. im used to intermittent and bad connection but this one has me stumped.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

its really something on that little sub-framethat holds the input boards and the control board. i have the tv all on the side with that frame upside down and i cant reproduce the issue at all

its whenever the sub-frame holding those 2 boards is being grounded at some point at the bottom of the tv it's creating the issue it seems. really strange ?!?!

// before i start pulling my hair, having a break on this issue..

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

I would put it on the Y-buffers because the lines don't appear to move. I could not be certain. Have you changed the buffers? In which case, suspect the control board.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

It's really something that happens when the little sub-frame that holds the input boards gest grounded. really hard to find what's happening for me.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

i found how to reproduce the issue. its something about a 'bad ground' ? its how i would call it.. if i take a wire with the subframe out of the chassis and ground the input boards, the lines appear.

as soon and the subframe is connected to the ground of the chassis, lines appear. what does that mean ?

there is no lines when im using the tuner input !!!

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

bad lvds cable !!!!

completely stopped after replacing it.

i've tried reflowing a lot of stuff including the lvds connector on control and input boards, but it really stopped after replacing the lvds cable from other tv.

if i put it back it reappears instantly. at least i know now !!

thanks for the support guys !!!

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

i was wondering - are all those lvds cable similar, as far as pinout goes ?

ive found a cable, but idk if it would work.. just dont wanna fry things

i'd guess it's ok since lvds is usually standard.. but.. im not sure

http://www.ebay.com/itm/LVDS-Cable-f...item2a2352fc37

would that be ok ?

// edit : oh well, it seems its about the same tv, the toshiba 50hp66.. same boards or very similar design.. i'll buy that one

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Didn't you have a cracked screen 42 inch model, or am I getting confused here... thought that the LVDS might be the same for that model.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

its not the same, and i was wrong AGAIN...

for some reason the issue re-appeared. damn, this one is tough. as soon as i ground the input board (put it on the frame) the lines appear. with the board floating not grounded the issue is not there.

does that mean a component is shorted or close to on that input board ?

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

looks someone was here before me. there was 2 pads shorted, a component called SLIT100. what could this refer to ?

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Picture?

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

its just a jumper, there was a few more around.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

im cooking the input board in the oven. trying a reflow..

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Does the problem affect the menus?
How is it on the white wash mode?