LG Plasma 50PC1DR- Y-SUS Issues

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

i forgot the board in the oven while over the phone.. lol

this one's dead. oh well, at least ive got a replacement from the broken screen 42'' seems its the same board

im swapping the from tsop chips right now.. cauz when installed, i had only 42'' of the screen working.. and the same blue lines

i really dont know whats causing this thing to bug, but it's sure bugging me.

i will check in a few minutes if it affects the menu. how can i access the white wash mode? i have no remotes (have some coming from china in a week or 2, tho)

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

D'oh!

You need to access the menu and select ISM Method (forget exactly where it is), then White Wash.

42" is 1024x768. 50" is 1366x768.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

do i need a remote, is it in the service menu ?

eh, do you have a clue where is the panel information stored into, is it the tsop rom chips ? hehe

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

argh. where do you think panel configuration is stored, on that board ?

http://assets.shopjimmy.com/media/ca...0/003_4_16.JPG

so far ive swapped the 2 tsops ic105/6, ic602 the 24c eeprom, then ic202 over the tsop the 24c eeprom, then ic111 another eeprom.. no go

i hope its not stored in the cpu, dammit

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

im still swapping chips. i really tought it was in a small eeprom..

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

It might be the control board is hard wired for 42". I wasn't aware they were swappable anyway.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

what do you mean hard wired for 42'' ?

i have 2 identical input boards, with same rom versions and same components. everything is identical hardware wise so it's something programmed into either an eeprom, a cpu, a rom or any programmable chip

i was wondering if it was configurable into the service menu maybe ? i will continue swapping chips later, need to work a bit now

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

It could be for example an option-bit burned into the main processor, which is not changeable. I don't know for sure.

The service menu only controls the settings on the input/main board, assuming it is the one for the 50", then it would be sending a 50" signal.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

hehe okay. well im giving up on that input board, theres one for 30$ on ebay, that will do it.

i guess like you said there's something hardwired for the 42 or an option into the cpu. anyhow..

i got another issue weeee, im gonna be good with plasma issues someday ! the issue is, that i got some lag in the picture on one i just put back together.

everything works.. its just the picture redraw is somehow, laggy.. its slow to be refreshed.

ive checked, all the voltages are present and good, i messed a bit with the vsustain voltage, didnt change much. its laggy .. what can cause this behavior ?

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Re - lag: decrease -Vy a little, if it gets worse, increase it.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

i will try that right away. thanks

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

um.. nothing i can do with pots that will fix that thing. picture looks good, but i cant get rid of that nasty sluggishness.

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Trailing sparklies? or, what? Hard for me to know what you are talking about.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Sorry for not being clear. It's hard to describe, it's like if the picture was working but the video was in 5fps instead of 5fps. it struggles on fast moving pictures and at the bottom i see a kind of doubling of the image

here's a video, you cant see the slow refresh since its a video of a video, but you see that doubling weirdo bug at the bottom of the screen a few times !

here's the video : http://www.youtube.com/watch?v=pKHUlenj3CE

if you watch it completely you'll see what i mean.. video is slow and buggy

thanks !!!!

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Ah, I see it now.

I would suspect that you have a dodgy LVDS cable!

If it's not that I'd look at the buffers though it looks too "good" to be a buffer fault to me. Usually buffer fault causes sparkling random stuck pixels or pixel noise. Either way, it's not the Y-sus, Z-sus, or any of the drive voltages.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

it's the video input board that's giving me trouble. a swap with one from the other tv and results are good, using all the same cable. aaah another trouble again !

i guess that one, you just replace it right ? i cant tell by checking the board what could be causing it.. ram chips maybe, idk. i see one xtal has been replaced already..

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

If the xtal died the first time, maybe also the second time.
You would need a scope to check though :/.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

you're pushing me to buy one eh ? heehe just kidding...

but what im wondering is, will i use it enough to justify that 400$ expense..

is there a way to test an xtal ? // with a multimeter.. for now ?

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

anyone knows what causes a thin vertical line from to to bottom of display ? its very thin, about 1 pixel wide, and it doesnt appear on blacks only on colors. if i run an anamorphic movie with a black bar on top and bottom, the line isnt there.. its just on colors !

could it be a flat cable on one buffer that needs some cleaning ? just thinking out loud.. its a very thin line, but its still annoying

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

I have another issue. Again.. from digging a little deeper in the old internets, ive found this interesting post.. on videokarma

http://www.videokarma.org/showpost.p...9&postcount=14

From what this guy says, its a good thing to check the YSUS at R61 (that's the testpoint) to check +18V on the ipm. And if it's off, it means trouble..

Well mine is at 16.2 vdc right now. I don't have access to a remote (come from china, faster!!!) to get into the service menu and access that white wash, but for now, the voltage is off on the 18V on the ipm's.

So something else is causing the death of the ipm's on that board, he says faulty caps, could be SMD... argh

How is it possible to find leaky SMD caps if we don't know the value, since there's no service manual that cover component level for the y-sus ?