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AVS › AVS Forum › Display Devices › Digital Projectors - Under $3,000 USD MSRP › PT-AX200u - replaced the in & out blue polarizers, still have blob in center...now what?
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PT-AX200u - replaced the in & out blue polarizers, still have blob in center...now what?

post #1 of 7
Thread Starter 
Hi,
Thanks for all your posts regarding the PT--AX200u; they have been very helpful. We have been fortunate with over 8000 hrs on our machine.

We started with a yellow blob in the top left quadrant about 6-8 months ago. We replaced the bulb (it was time anyway), which didn't fix anything. The higher temps from the new bulb just caused the yellow spot to grow until it took up 2/3 of the screen.

I ordered & replaced the In & Out blue polarizers. The old ones definitely showed burn-in and I thought I had solved the problem. While I was in there, I also inspected the red & green polarizers which looked fine.

After I reassembled the machine, I turned it on to test & much to my annoyance, the same shaped blob was still there. I didn't have a video source connected so all I saw was blue screen. I think the color has evened out, but there is a darker blue center with a ring of brighter blue around it, framed by normal blue.

In addition, I originally was experiencing a yellow jagged fringe on the right side of the picture. I thought the old blue polarizer must have been delaminating & the new one would fix it, but I can still see that outline as well.

Anyone have any suggestions as to what next?

Thanks for your help,
Ruth
post #2 of 7
Thread Starter 
Update: OK, I took the machine apart again hoping to find the smoking gun. Turned up nothing.

However, in my rush to test the projector again (with fingers crossed) I forgot to connect the ribbon cables to the LCD panels. The image projected was white, with yellow fringe edges and an off-white blob taking up 2/3s of the image. The blob wasn't as well defined as it is on the blue screen.

I took a sturdy piece of cardboard and blocked the light one at a time from each polarizer. This is definitely a blue problem. What else can I do?

Any thoughts?

Thanks in advance.
post #3 of 7
Let me save you a lot of trouble. The Yellow blob is not the Polarizer its the blue LCD panel itself . Its fried. Generally replacing a polarizer is no big deal. The LCD panel is a bit trickier. If you do decide to replace it MAKE SURE you don't move or unseat the other two Panels or they will go out of alignment and it will be even tricker to get them all aligned. You can align the new blue panel to the existing two panels.
Hope this helps.

Bohanna
post #4 of 7
Thread Starter 
Bohanna. Thanks for the help. I took the blue LCD panel out and could see a cloudy shape.

I looked up the part on the Panasonic website - $300+ !!!!

They only list one part number as LCD panel... do all 3 colors use the same LCD panel part? I might be able to salvage an old red or green LCD panel if that's the case.

Thanks,
post #5 of 7
Quote:
Originally Posted by Mopsmom1 View Post

Bohanna. Thanks for the help. I took the blue LCD panel out and could see a cloudy shape.
I looked up the part on the Panasonic website - $300+ !!!!
They only list one part number as LCD panel... do all 3 colors use the same LCD panel part? I might be able to salvage an old red or green LCD panel if that's the case.
Thanks,

I am not sure. Some projectors use three of the same panels and filter before things go into the prisim but my guess is no. You may want to call Panasonic and ask to talk to a projector tech and ask. If you do decide to go with a replacement panel. Make sure to order the polarizer(s) as well. I would also buy a service manual ( not an owners manual)
This way you can learn how to tweek the color adjustments.

Bohanna
post #6 of 7
Thread Starter 
Thanks Bohanna.

I do have the service manual, which only lists one type of LCD panel and talks about connecting the projector to the computer for fine tuning.

It's getting pretty pricey in parts. I'm deciding if I should buy new or gently used

Has this problem been addressed in any of the newer projectors?
Anyone have any great recommendations in the Under $1500 range?

Thanks,
Ruth
post #7 of 7
Quote:
Originally Posted by Mopsmom1 View Post

Thanks Bohanna.
I do have the service manual, which only lists one type of LCD panel and talks about connecting the projector to the computer for fine tuning.
It's getting pretty pricey in parts. I'm deciding if I should buy new or gently used
Has this problem been addressed in any of the newer projectors?
Anyone have any great recommendations in the Under $1500 range?
Thanks,
Ruth

Open the projector and see if the LCD panels all have the same numbers on them. If they do you may have to deal with a one size fits all replacement panel that need to be tweeked from panasonic.
The Panel problem that has been addressed in some of the newer panelled projectors is they use inorganic panels that are supposed to hold up better than the traditional Organic TFT panels.

Bohanna
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