Oil looking spots and a darker then normal screen, Please help

[AT_Viper]

I just bought an LG 50px1D for $100 and the guy said it wasnt used for 6 months because there was no picture. There was sound but there was no picture. So i did some research via this awesome forum and found that it needed a new Z-SUS board. Well i took the back off and looked around and noticed the cable behind the fan, going to the Z-SUS board was unplugged! I plugged it in and bam, some pixels started turning colors and I started getting my picture back. It looks like an oil spill on my screen with about 60% of the screen visible and when the screen changes some pixels turn black before regaining the appropriate color. I have pictures but they are not very good. Please help! Thank you

The screen is quite dark as well, Picture below. The spots are not always in the same location like a burn in would be. I can watch as the spots slowly dissipate but it still covers about 20%-30% of the screen.

[mockingbird]

Re: Oil looking spots and a darker then normal screen, Please help

I think you need a new one of these:

[mbates14]

Re: Oil looking spots and a darker then normal screen, Please help

any time you get dark pix with oil spill symptoms, bad Z-Sus.

[AT_Viper]

Re: Oil looking spots and a darker then normal screen, Please help

what is the item above Mockingbird?

Mbates14, does the z-sus need to be broken in after sitting for awhile? After some more playing when the screen switches to a mostly white picture much of the black "oil slicks" disappear. (covering only 5% of the screen) Then if i switch the channel the screen becomes oil slicked to about 20% again.

[AT_Viper]

Re: Oil looking spots and a darker then normal screen, Please help

In the repair manual is states the z-sus board P/N is 6871QZH036B while looking on ebay the only P/N's listed are 6871QXH044C is this just a different rev. board? (Seller states its compatible)

[PlainBill]

Re: Oil looking spots and a darker then normal screen, Please help

In the repair manual is states the z-sus board P/N is 6871QZH036B while looking on ebay the only P/N's listed are 6871QXH044C is this just a different rev. board? (Seller states its compatible)

Look at the part number on the Z-sus itself, don't trust someone on eBay.

PlainBill

[AT_Viper]

Re: Oil looking spots and a darker then normal screen, Please help

Updated!

Replaced the z-sus board and one month later, POP! and the screen goes black.

So obviously the z-sus isnt the REAL problem here. Something has to be making this occur.

Does anyone have any more information as to what is causing this to happen?

[rayrod81]

Re: Oil looking spots and a darker then normal screen, Please help

One of the IPMs on the Y-sustain just went out (possibly Z-sustain). Check the fuses on the Y and Z boards for continuity. The one that has an open fuse is the problem. Just replace the bad board and that should fix your problem. It is a common failure on these LG panels. The IPMs go out because they break down over time due to heat. You initially had a bad Z-sustain and now you have a bad Y-sustain most likely. There are probably not any other problems. You can replace the IPM but if you decide to go that route then both IPMs on the bad board must be replaced or you will soon have the same problem.

[AT_Viper]

Re: Oil looking spots and a darker then normal screen, Please help

all fuses appear NOT to be blown. I ran the tv for about 5 minutes then felt all the heat sinks on the z-sus and they were warm. I felt the two on the y-sus and one was ice cold. Is this enough diagnosis to replace the y-sus. I just replaced (1 month ago) the z-sus board so I would hate to think it was the z-sus. Any help would be great.

Thank you by the way rayrod81 and all others

[craftyone714]

Re: Oil looking spots and a darker then normal screen, Please help

Hello all, I have a similar problem. I just got lg50px1d and had some oil spill look on the screen with darkness. and grainyness. I replaced both IPM's with new ones on the ZSUS and still grainy and dark but not as bad. one of the Ipm's was Physically POPPED it had blown epoxy right off the IPM. now im not sure whats wrong can any one give me some pointers ?

[craftyone714]

Re: Oil looking spots and a darker then normal screen, Please help

the ipm's on ysus and zsus do not get warm at all really

[AT_Viper]

Re: Oil looking spots and a darker then normal screen, Please help

Are there two different type of board setups in these LG 50px1d plasma tvs? I just got parts for mine and it is the same exact model tv but the y-sus is much much different. Are they both compatible? If so how? One connects with ribbon cables the other with metal plates.

[PlainBill]

Re: Oil looking spots and a darker then normal screen, Please help

Are there two different type of board setups in these LG 50px1d plasma tvs? I just got parts for mine and it is the same exact model tv but the y-sus is much much different. Are they both compatible? If so how? One connects with ribbon cables the other with metal plates.

Don't order parts by the model number of the TV. I have seen many errors on listings of boards for sale. Also, it is not impossible two different plasma panels would be used in the same model TV. Always specify the board number. On LG TVs this is on a white sticker on the board.

PlainBill