Dust blob or dying blue panel? - AVS Forum

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Digital Projectors - Under $3,000 USD MSRP

Shock96's Avatar Shock96
10:27 PM Liked: 12
post #1 of 7
01-08-2013 | Posts: 207
Joined: Jan 2004
Hey everyone. I have a Hitachi PJTX100 projector that has been our main movie watching unit for the last 4 years. I think it has been a great projector. It has about 5000 hours now with about 320 hours on a new bulb.

I am starting to get a blue haze on part of the screen. Do you guys think this is a dust blob (never had one before) or is it a sign of a failing blue panel in the projector?




Also, since I put in the new bulb, I have to tap on the projector to get the bulb to fire. Time for a new unit? Thanks!
jnabq's Avatar jnabq
10:52 PM Liked: 39
post #2 of 7
01-08-2013 | Posts: 1,128
Joined: Mar 2004
Using the "focus" will usually help determine if it's a dust blob.
DragonSixGolf's Avatar DragonSixGolf
11:16 PM Liked: 13
post #3 of 7
01-08-2013 | Posts: 148
Joined: Mar 2007
most dustblobs are only 6"-12" and round.. Sorry, but that looks like a bad panel. the PJ does have service menu where you can adjust color by area, so you could take some blue out of the left side but... she's lived a good life, might be time to put her down. There are so many nice new projectors out that are sure to be better. none will have that massive glass eye tho.
Shock96's Avatar Shock96
07:53 PM Liked: 12
post #4 of 7
01-09-2013 | Posts: 207
Joined: Jan 2004
Ahh, ya, That is what I figured. It is gradually getting worse. It is still pretty watchable for the moment, but I am on the hunt for a temp replacement. I am getting ready to start building the dedicated theater room so I need to stay on the cheaper side. I am eyeballing some nice used JVC DiLA units (RS1) that would work for now as well as have the long throw for the new room as a temp unit.

If anyone has any other ideas, let me know. I will check the service menu and see if I can do some correction.

Thanks all!
DragonSixGolf's Avatar DragonSixGolf
10:43 PM Liked: 13
post #5 of 7
01-09-2013 | Posts: 148
Joined: Mar 2007
Here's a map to the screen locations. Just remember, if the proj is upside down, the areas are reversed (3,9,11,17 will be on the left/upper left) it's been 5+ years but i think that's how it worked.

pj100tx screen menu.JPG 39k .JPG file
Attached: pj100tx screen menu.JPG (39.4 KB) 
Shock96's Avatar Shock96
11:39 PM Liked: 12
post #6 of 7
01-09-2013 | Posts: 207
Joined: Jan 2004
Thanks a bunch! And it is flipped. smile.gif
Bohanna's Avatar Bohanna
07:03 AM Liked: 24
post #7 of 7
01-11-2013 | Posts: 638
Joined: May 2007
Your Blue LCD panel is on the way out. If you have a lamp economy option in the setting menu that will slow the panel's degradation rate but it needs to be replaced along with the Polarizer. Turning down the brightness level WON'T do it. You need to turn down the output from the Ballast thats powering the lamp. I'm guessing that the new lamp helped accelerate the panels breakdown.

Sorry bout that - Bohanna

-BTW the thing that goes with a LCD projector is the Blue Panel-- The thing that goes with a DLP projector is the color wheel-
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