LG Plasma 50PC1DR- Y-SUS Issues

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

You probably have bad Y-sus and buffer boards.

One IPM, the one closest to the coils, does energy recovery. Makes the plasma driving more efficient.

The other IPM sustains the panel, the major part in making it light up.

[microvibe]

Re: LG Plasma 50PC1DR- Y-SUS Issues

actually my tv isnt same as thread title just same ysus i believe i have a 50pc3d

[microvibe]

Re: LG Plasma 50PC1DR- Y-SUS Issues

resureccting old thread but i have same tv and positive its y-sus, my tv powers on fine plays sound but the screen flashes on and off with ipm on y-sus clicking away. what do the 2 ipms on y-sus do exactly. one of them is humming like the ipm's on the zsus. when the screen flashes i dont see a picture or menu picture its just white noise or white and grey thin lines. i have tried with buffers disconnected as well. the tv didnt have any bad fuses the psu caps were all good and it will play a whole movie like this without shutting down. i did use the -vy vsc test points and voltages are all over the place with the clicking. these boards are pricey so i would like to repair it instead of replace but at $40 a ipm not sure if its economical lol

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Hi there. Yes they are ! But make sure to use the good ones..

here's a quick x-ref i've done by searching a little, it should be right !

yppdj014 = STK795-811
yppdj015 = SPI-50X3E240
yppdj016 = SPI-50X3E120
yppdj017 = STK795-821 STK795-820
yppdj018 = STK795-821 STK795-820
yppdj019 = ???
yppdj023 = ???

[jjanssen7]

Re: LG Plasma 50PC1DR- Y-SUS Issues

cheebster (or anyone else), did you ever figure out if the LG IPM's are compatible with the sanyo ones? jo15b,jo15c,jo15e, jo16b,jo16c,jo16e etc?

Thanks!

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Hi tom66. I've found a site yesterday, never came across this one, has a lot of free tv service manuals.. i thought i would share !

http://www.servicetron.com/tv-service-manual.html

Seems to be a lot there !

Thanks will keep it in mind.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Hi tom66. I've found a site yesterday, never came across this one, has a lot of free tv service manuals.. i thought i would share !

http://www.servicetron.com/tv-service-manual.html

Seems to be a lot there !

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

Yes. But reading that article, it seems that the failed SMD radial silver ones that arent failed but just, old, could be the culprit of the IPM failure. Im digging a little deeper, because those fixed plasmas i got here are for my friends and i dont want them to come back. im selling them for cheap but still, i want the repairs to be reliable...

if its just a few caps more to replace, ill do them without thinking twice

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

A scope is a more handy thing to use, so save up for that first IMO.
I find very few electrolytics (maybe two in total) that have failed without bulging.

[cheebster]

Re: LG Plasma 50PC1DR- Y-SUS Issues

AH ! Thanks tom66. I was wondering if i should replace them, or at least check all of them for a proper ESR value.

I don't have a esr meter, but i could buy one if it's handy to have..

[tom66]

Re: LG Plasma 50PC1DR- Y-SUS Issues

The SMD caps he probably refers to are the round radial silver can ones. Which have a valued printed on them. They are electrolytics.

[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 ?

[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

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 ?

[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

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

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

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

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

[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.