I bought this projector new in 1999 and it has about 2000 hrs on it. Two years ago a problem surfaced for about two months and disappeared by itself. Three weeks ago the same problem re-surfaced. It is a magenta vertical band overlaying the picture on the left side of the screen. It is sharply delineated and covers about 10% of the screen starting from the left. SONY here does not do home visits. I would have to take the monster down and deliver it to them for an inspection. Before I do this, does any one have a suggestion about the cause ?
Thanks,
Louis

Louis, could you post a picture of the problem for us to see?

Cliff

Does this problem appear on all sources? Do the RGB shift contols have any effect on the band?

Does it do it on the internal patterns?

Post where you are located. There may be someone here who is close by that could help you out.

All good questions, thanks to all of you, I will do my homework and get back to you tomorrow!

Louis
Laval, QC, Canada

Like going to the dentist, magenta band disppeared completely today. Next time it comes back I now know what to check for. Thanks again to all of you. Always a good thing in anything, this problem led to a search and the discovery of this forum!

Louis
Laval QC
Canada

Lou , If the problem comes up again there is a guy on this forum from montreal who i bought some lenses from. I believe he is a tech with crt projectors. send him a PM ( private message). his name on here is: dt_danny. he might be able to come buy and help you out.

Athanasios

Wow, I know exactly what he is talking about. I had the same issue with my then new G-70 and actually shipped it back to Sony under warranty. They had it for 3 weeks and could not find a problem.

I reinstalled it and there it was, same as ever! Then one day it was just gone and never came back. i have since sold it.

Thanks Athanasios, noted and good to know. For the moment I keep my fingers crossed. Reassuring to see the kind of help one can get on this forum. Regards.

Louis
Laval QC
Canada

I bought this projector new in 1999 and it has about 2000 hrs on it. Two years ago a problem surfaced for about two months and disappeared by itself. Three weeks ago the same problem re-surfaced. It is a magenta vertical band overlaying the picture on the left side of the screen. It is sharply delineated and covers about 10% of the screen starting from the left. SONY here does not do home visits. I would have to take the monster down and deliver it to them for an inspection. Before I do this, does any one have a suggestion about the cause ?
Thanks,
Louis

If the raster is hitting the sides of the CRTs you may see something like what you describe. Try adjusting the blanking inward to insure this is not the case.

Thanks Athanasios, noted and good to know. For the moment I keep my fingers crossed. Reassuring to see the kind of help one can get on this forum. Regards.

Louis
Laval QC
Canada


Since it's ceiling mounted, you should check the seating of the two large boards located between the tubes. When not seated correctly the spring catch on each board won't engage properly. I've also had similar problems from oxidated contacts on boards, which reseating them (simply removing and reinstalling) corrected.

Be careful though when reseating the boards to make sure they are in the track so that you won't damage any pins (causing a NEW HEADACHE).

Thanks, Mike and Techman707, I will sure check this.
Louis
Laval QC, Canada

If the raster is hitting the sides of the CRTs you may see something like what you describe. Try adjusting the blanking inward to insure this is not the case.


I sure hope the rasters aren't that close to the edges, since it can cause tube failure.

Techman 007, I could not find a definition of"raster", could you define and explain proximity to tubes? Thanks.
Louis
Laval QC, Canada

Techman 007, I could not find a definition of"raster", could you define and explain proximity to tubes? Thanks.
Louis
Laval QC, Canada

The "raster" is the lit portion on the face of the tube. The "size" of the raster is sometimes adjusted LARGER than the "out of the box size" by the installer who sets up the projector.

In an attempt to use more of the tube face (which can improve light efficiency and resolution), the installer can get carried away. If the raster is enlarged to the point where it is too close, or because it is off center and is hitting the tube frame, it can cause early tube failure or the tube can crack.

BUT......while it should be checked, don't become paranoid about it since it's not that common an occurence. :)

I thought it was the active picture area and not the raster that needs to be kept at least 3mm from the edge of the phosphor to prevent tube failure.

Thanks again for all the help. I have looked at both the Operation and the Installer Manuals and I can not find a reference to adjust either the raster or the active picture the required distance from the side of the tubes. Is this something that you could explain to me so I could check? By the way the problem has not reappeared again so far.

Louis
Laval, QC, Canada

Magenta band is back but narrower.

Louis

I thought it was the active picture area and not the raster that needs to be kept at least 3mm from the edge of the phosphor to prevent tube failure.

The raster determines the active picture area.

Magenta band is back but narrower.

Louis


Turn down the contrast and look into the lenses to see how welol centered the rasters are on the tube faces. You should turn up the brightness to light up the raster so you can see it more easily.

Thanks again for your help. Leaving for a few days. Will sure try it when I am back early August and will let you know of my progress!

Louis
Laval, QC, Canada

Thanks again for your help. Leaving for a few days. Will sure try it when I am back early August and will let you know of my progress!

Louis
Laval, QC, Canada

If I had a G90 I would never leave home. :)

If I had a G90 I would never leave home. :)

:D :p :D lol.

My problem seems fixed (fingers crossed)! Here is the story if anyone ever experiences similar problems: Back home in August, the problem is still there and I experiment with just about all the advice received on this thread. Following Techman707 advice we unplug and reset the large boards located between the tubes. Resetting one of the two boards between the red and green tubes clears the problem immediatly. I am elated! However the problem comes back after four days and stays on, even worse than before. After two weeks without improvement I decide to try the same remedy. The cover of the power supply behind the green tube preventing me to remove the suspect board completly, we decide to remove it to inspect the board contacts. Doing this reveals a smaller board over the heath sink with one of the lead connector pulled out of its socket and barely making contact. Reseating it solves the problem completly. I assume that this was the real problem and that the removal and reseating of the big board in the first instance caused enough vibration to make the problem disappear for a few days. A full week has now passed by and the images are gorgeous. Lesson learned for me: worthwhile checking all physical connectors. Thanks to all of you and in particular to Techman707!

Louis
Laval
Qc

Glad you got it worked out!

Thanks for closing the loop and documenting what the root cause was.

My problem seems fixed (fingers crossed)! Here is the story if anyone ever experiences similar problems: Back home in August, the problem is still there and I experiment with just about all the advice received on this thread. Following Techman707 advice we unplug and reset the large boards located between the tubes. Resetting one of the two boards between the red and green tubes clears the problem immediatly. I am elated! However the problem comes back after four days and stays on, even worse than before. After two weeks without improvement I decide to try the same remedy. The cover of the power supply behind the green tube preventing me to remove the suspect board completly, we decide to remove it to inspect the board contacts. Doing this reveals a smaller board over the heath sink with one of the lead connector pulled out of its socket and barely making contact. Reseating it solves the problem completly. I assume that this was the real problem and that the removal and reseating of the big board in the first instance caused enough vibration to make the problem disappear for a few days. A full week has now passed by and the images are gorgeous. Lesson learned for me: worthwhile checking all physical connectors. Thanks to all of you and in particular to Techman707!

Louis
Laval
Qc

Glad to hear you were able to clear the problem.:)

To any other people with similar strange problems that appear to just "pop-up", always check the seating of your boards first, especially if your projector is ceiling mounted. The board, especially the larger heavy ones, can unseat themselves and/or the contacts can become oxidized over time.

With the Sony projectors, make sure that the "cheap" catches are engaged, or you will guarantee yourself a problem.;)

If I had a G90 I would never leave home. :)

Which explains Cliff's constant posts here...:p