CurtPalme.com Home Theater Forum

wallace123456 · Joined: 14 Aug 2006 Posts: 2236 Location: Northwest VA area

Hey,
What the hell is the blue bar on the right from? this is on a sony 1272. switched inputs between moome dvi and s-video. same blue bar. i did not try switching sources yet but don't think that would make a difference as blue bar is there on internal test patterns as well. current source is xa2.

there is some (probably a good bit) visable wear on the blue tube.

thanks.

wallace

**AnalogRocks** · Posted: Thu Nov 29, 2007 5:32 am Post subject:

That's the color a new blue tube would look in your Sony. You're outside the wear pattern of the tube. Sux don't it? Sad

ecrabb · Posted: Thu Nov 29, 2007 5:41 am Post subject:

Yep. Wear. On the right, you have a nice, deep blue sky with purdy cool whites. On the rest of the screen, your whites and blues are tainted with what appears to be a yellow cast... or more precisely, the lack of blue. Bummer.

Gotta move the projector back and/or toe the lens, replace the tube, or live with it.

SC

**AnalogRocks** · Posted: Thu Nov 29, 2007 6:39 am Post subject:

Wouldn't replacement tubes be nice? For a reasonable price.

tony359 · Joined: 04 Aug 2006 Posts: 378

If you go on GAIN you'll the that the left part of the screen is yellowish for the wear. You can choose to crank up the Blue gain to compensate the wear. Then you'll have the corect blue on the left (the most part of the image) and a too much blu image on the right.

Options:
1. Live with it
2. try reducing the rasters to project the image within the old wear, then crank up the blue to compensate
3. replace the tube

Ciao
A

wallace123456 · Joined: 14 Aug 2006 Posts: 2236 Location: Northwest VA area

Thanks. Thats what I thought. Makes me want to effing cry....

These tubes were supposed to be better (only 3,700 hours and what looked like less wear) than the original tubes I had (7,900 hours and some wear).

I swap the blue out with the older one tomight and see what happens.

wallace

ecrabb · Posted: Thu Nov 29, 2007 4:08 pm Post subject:

It's interesting... Before I replaced the tubes, my 1272 looked exactly the same - and even had around the same number of hours on it - 3600. Looking at your pic, I was thinking the wear was on the other side, but then I realized yours is probably on the ceiling and mine was on the table.

Most of these projectors were installed according to the manual, which made the wear pattern so small... Then, because of the S/M/L spacer thing, most installations also had the blue and red rasters shifted way off center. Dammit.

SC

wallace123456 · Joined: 14 Aug 2006 Posts: 2236 Location: Northwest VA area

Man, you hit the nail right on the head! The wear on the blue is WAY far off center. Of course, now, when I max the raster, this is what I get. The amount off center would not make it worth my while for me to min it to fit inside the wear.

The person(s) before me must have had the blue cooking as I can't really see any wear on green or red.

wallace

ecrabb · Posted: Thu Nov 29, 2007 8:02 pm Post subject:

On the 12xx Sonys, to get correct color balance, the blue tube gets driven much harder than green. Green gets driven much harder than red. Because the red isn't driven very hard, you'll rarely find red tubes with wear - regardless of how many hours they have on them. Green tubes with a little wear are pretty common, on the other hand. Blue tubes WITHOUT some wear are pretty rare. Guess which tube everybody always needs?

It's unfortunate, but because of shipping, good blue tubes for these machines are actually worth as much or more than the machines themselves.

SC

tri_joel · Joined: 03 Jul 2007 Posts: 646 Location: Northern Virginia

This is the same problem I have with my 9PG+. Really sucks. I moved the PJ further back and was able to put the picture within the wear. Not very excited about using it this way.

I have wondered if tinting the glycol would help. Maybe a crazy idea. Neutral

ecrabb · Posted: Thu Nov 29, 2007 10:05 pm Post subject:

Fujifrontier · Joined: 20 Oct 2007 Posts: 354 Location: San Antonio, Texas

What about "wearing in" the unused blue with a steady bright blue bar projected on that spot for 10-12 hours? Kind of an intentional "burn," but beneficial in this case?

tony359 · Joined: 04 Aug 2006 Posts: 378

Wallace

Check the wear by eye before exchanging tubes! You can easily predict the result by eye!

Ciao
A

wallace123456 · Joined: 14 Aug 2006 Posts: 2236 Location: Northwest VA area

Here are pictures of the tubes.

The tube on top is the one with 3k+ hours (thats the tube that I had in when I took the pictures), and 7k+ (almost 8k) below. Yea, pretty damn obvious. BITCH!

This is the first time I have ever swapped tubes and was not sure what to expect. I was thinking maybe the 3k tube would be sharper than the 7k.

Live and learn.

wallace

ecrabb · Posted: Fri Nov 30, 2007 3:44 am Post subject:

If you would have asked first, I would have told you to go with the higher-hour tube with less burn - concidering it's the blue tube. Sorry, don't mean to rub it in. Wink

The blue tube gets intentionally defocused to increase light output, anyway. So, a little softness doesn't hurt there. Look at the unnecessary swap this way: Think of all the priceless experience you got swapping tubes and seeing first-hand how the two different kinds of wear manifested themselves on-screen. I'm thinking positively for you. Wink

Now, the only concern I have with that higher-hour tube is that there seems to be a slight latent image of a dude in a white polo shirt with dark stripes on it. He looks kind of pissed off about something. Wait, that's a reflection... Never mind. Smile

SC

wallace123456 · Joined: 14 Aug 2006 Posts: 2236 Location: Northwest VA area

**AnalogRocks** · Posted: Fri Nov 30, 2007 4:58 am Post subject:

damn ecrab beat me to it. See what happens when I actually goto work and pay attention at the job? Wink

tony359 · Joined: 04 Aug 2006 Posts: 378

Yes, the higher hours tube seems better to me too.

Unfortunately it has two darker part on it's center, plus two dots?, and this can be very annoying.

The lower hour will show a blue bar. The higher hour will show some yellowish spots.

The only alternative is to constrain the raster in the burned part of the higher hours tube.

Ciao
A

ecrabb · Posted: Fri Nov 30, 2007 6:44 pm Post subject:

The spots might just be a goober on the face of the coolant chamber, and the goober's shadow on the tube face. Might wipe right off.

Yes, there's significant wear in the center of the tube, but it will be less objectionable than the other tube, I think. It will result in a slightly yellowish center area. It's nice and soft, though so it might not be that noticeable.

Using the other tube and reducing raster will increase throw distance significantly - he may not even have room - and it will wear much more quickly - both the worn blue tube, but the other two also. I'd try the high-hour tube personally and see how it looks. Might be fine for a few months while you search for a replacement or a donor projector.

SC

tony359 · Joined: 04 Aug 2006 Posts: 378

Uhm... For my personal taste I think I'll prefer the blue band rather than the blue spots!

Ciao
A