CurtPalme.com Home Theater Forum

deewaan1 · Joined: 06 Apr 2008 Posts: 68

Hi. I have a Marquee 8500 and have been having the same problem intermittently over the last couple of years. While watching a movie the picture goes black for about 2 seconds and then comes back on. There was never a failure light on the back during one of these failures. I would open the projector up and remove the boards, clean the contacts and reseat them. Don't know if this made a difference but I gave it a try. It would operate fine for months and then one day it would go black again. A few weeks ago it started up and the picture had shifted far to the left. I immediately turned on the left blanking to ensure it would not damage the tubes due to the picture touching the tube edges. I left the movie run for about ten minutes more and the picture went black and the image on the tubes corrected itself and was back to center. Today I was watching a movie and the picture went black and reset again about 1 hour into the movie. I continued to watch the movie and once again the picture went black about half an hour later. It continued to go black continuously again and again and then came back on with the picture shifted to the left. It again went black and I saw that the horizontal fail light came on on the back panel. Does anyone have any suggestions? I hope I don't need a new horizontal board. I'm saving for a HD input board upgrade. Thanks!

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

Spunds like the machine is detecting a scan failure and shutting down the beam to protect the tubes. you should pull the Horizontal module out and remove the small daughter board towards the bottm. Clean the 4 rows of contact pin and re-assemble. Also, if your handy replacing the big capacitor at board location C50 is a good idea.

deewaan1 · Joined: 06 Apr 2008 Posts: 68

Problem hasn't reared it's ugly head in months, but it's getting to that damp cold time of year again and I expect it to be back. Keeping fingers crossed it won't. I think the conditions in the basement at certain times of year are the cause.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

If you havent done so do as Dragnm stated and also go get yourself some denatured alcohol form the hardwear store, an ic puller and some Caig cleaner from Radio shack and clean the board with the alcohol and a tooth brush then pull each chip off the CLM. Do one at a time and remember its orientation on the board. I spray some of the Caig cleaner into a shot glass and use a tooth brush to clean the chips contacts and the contact on the boards carrier for that chip, then put the Caig conditioner on the chips and reseat them, do all chips. Put some of the cleaner on the daughter board of the HDM too. You should also read the Mike parker maintenance thread also on here, the HDM has some solder points that should be resoldered and the Capacitor C50 should be changed, that shifting of the image could have been that cap causing it.

Athanasios

deewaan1 · Joined: 06 Apr 2008 Posts: 68

Thanks I give it a try. Do you have any input to my new problem? I have a post titled Marquee 8500 problem with horizontal lines in tubes. I have horizontal lines running in three columns diagnally across the tubes from top right to bottom left. It showed up a couple of times in the past but now seems to be permanent.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

deewaan1 · Joined: 06 Apr 2008 Posts: 68

Yes the lines are on all tubes. Here's a pic:

energeezer · Joined: 08 Aug 2007 Posts: 67

Hey deewaan1
I have the chip puller.
You get the alcohol

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

I have seen this before posted on AVSforum site. it was a 9500LC also, I'll have to look for it.

Athanasios

deewaan1 · Joined: 06 Apr 2008 Posts: 68

I fired up the projector last night to try a few things and the problem is much worse. Now the number of lines has quadrupled and are scanning all over the tubes randomly like static.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Well they're not retrace lines. It almost looks like something is going on in the video signal. Are they there when you have an internal test pattern up, like a full white screen or something?

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Ok I found the two threads on AVS that deal with this issue, if you did not ddo as my post above about cleaning all the chips on the CLM then do so, especially on the DPB U7. here are the threads over on AVS:

http://www.avsforum.com/avs-vb/showthread.php?t=816113&highlight=9500lc

http://www.avsforum.com/avs-vb/showthread.php?p=8833617&&#post8833617

Athanasios

deewaan1 · Joined: 06 Apr 2008 Posts: 68

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

here is the image from the link I added of the post with the same issue, its the chip U7 on the DPB of the CLM that needs to be cleaned, also check all the solder points of the connector pins to the DPB.

Looks the same as your problem.

Athanasios

deewaan1 · Joined: 06 Apr 2008 Posts: 68

Thanks people! I'm gonna work on it with energeezer in a few days and will let you know the results.

deewaan1 · Joined: 06 Apr 2008 Posts: 68

Well we removed all the chips and cleaned them, as well as all connector interfaces and it looks good so far. I ran it for a total of 10 hours and no faults. Keeping my fingers crossed. The only negative with doing this was I lost all my saved settings. So It went back to factory default and I had to redo the projector setup from scratch and all my input settings. But the fault is gone.