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jimdscott
Joined: 19 Oct 2007
Posts: 13
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| Posted: Sat Jun 28, 2008 12:36 pm Post subject: Marquee 8500 -- LVPS failure after non-use |
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Hi, all. I knew I wasn't going to be using my Marquee 8500 for a few weeks, so I unplugged the set and let it sit. Tried to fire it up last night and the LVPS diagnostic light came on.
I saw this thread and this one, so I have a lot of ideas on where to start looking for the problem: pull the CLM, look for problems there, remove, clean and re-seat the ICs, unplug the neck board, unplug the wired keypad, and so on.
My question is whether I should take any clues from the fact that the unit was working fine, then unplugged for 6 weeks, then failed immediately when plugged in again.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sat Jun 28, 2008 6:52 pm Post subject: |
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Hello
Probably a coincidence and not likely a failed lvps. Look at the red leds behind the front grill, see if one is flashing and tell us which led.
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jimdscott
Joined: 19 Oct 2007
Posts: 13
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| Posted: Sat Jun 28, 2008 7:36 pm Post subject: |
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Thanks for the suggestion.
So far, I've pulled the DCM, VIM, Stig board, focus board, HDM, and convergence board. When I try to plug in, the yellow standby light comes on and I can feel the fan from the LVPS. If I try to power up, I get a steady red LED for the LVPS on the back of the chassis.
Looking at the front of the projector, I see 8 red LEDs on the LVPS. Only the first LED is lit (closest to the plug, or on the left as I am looking at the front of the projector. It glows steady, it does not blink. Does that mean something?
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sat Jun 28, 2008 9:55 pm Post subject: |
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Hello
If upright, this is the sequence:
LVPS LEDs
left -15 -85 -24 +5 +24 +85 +15 right
Some board that needs -15v may have a shorted device on it.
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Last edited by Tim in Phoenix on Sat Jun 28, 2008 11:08 pm; edited 1 time in total
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sat Jun 28, 2008 10:30 pm Post subject: |
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Are these the Marquees that were produced by AmPro? There seems to be quite a few lately. 
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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jimdscott
Joined: 19 Oct 2007
Posts: 13
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| Posted: Sat Jun 28, 2008 10:37 pm Post subject: |
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Thanks, again, Tim. I pulled everything I could out of the chassis, including the keypad, but still had the LVPS failure. I pulled the LVPS out of the unit and plugged it in. Separate from any thing else, the 1st LED on the LVPS glows a steady red. I'm thinking it might be the power supply?
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sat Jun 28, 2008 11:11 pm Post subject: |
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| jimdscott wrote: | | Thanks, again, Tim. I pulled everything I could out of the chassis, including the keypad, but still had the LVPS failure. I pulled the LVPS out of the unit and plugged it in. Separate from any thing else, the 1st LED on the LVPS glows a steady red. I'm thinking it might be the power supply? |
Hello
Trying another lvps seems to be the next step for you.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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jimdscott
Joined: 19 Oct 2007
Posts: 13
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| Posted: Sun Jun 29, 2008 12:34 am Post subject: |
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Thanks, both. I'll give a new power supply a shot, see what happens.
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jimdscott
Joined: 19 Oct 2007
Posts: 13
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| Posted: Sat Jul 05, 2008 9:59 pm Post subject: LVPS replaced; red tube hesitates |
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Bought a used LVPS on eBay and plugged that into the chassis. At the same time I replaced the lithium battery. System powers up fine now, but the red tube seems a little hesitant. I went through the guided interpolation and each time I switched from the blue to the red tube, the red image took a second or two to appear. I'm guessing it's a bad or loose contact that I messed up when putting everything back together. Is there a likely culprit?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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