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MarchingCRT
Joined: 14 Nov 2008
Posts: 36
Location: Baltimore, MD
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| Posted: Tue Jul 01, 2014 2:37 am Post subject: Marquee won't turn off |
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I have a marquee 8500 that I got from Curt many years ago. It works great, except it has refused to shut down completely the last few times I have used it. When I power off the machine, the tubes go dark and the light on the back panel switches from green to amber, but the belly fans are still running. Any ideas?
Thanks,
Trent
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Trombone player by day. CRT nut by night.
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stridsvognen
Guest
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| Posted: Tue Jul 01, 2014 10:03 am Post subject: |
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Are you sure its not the LVPS fans running.?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Jul 01, 2014 2:10 pm Post subject: |
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I'm pretty sure it's running fine, you're always supposed to hear the power supply fans run. they run at 1/2 speed, or some reduced speed even when the set is powered down.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Jul 01, 2014 4:26 pm Post subject: |
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| Curt Palme wrote: | | I'm pretty sure it's running fine, you're always supposed to hear the power supply fans run. they run at 1/2 speed, or some reduced speed even when the set is powered down. |
you and I've noticed lately that these fans are getting really loud as they age. LVPS I just worked on sounded like someone grinding coffee even with machine turned off
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Tue Jul 01, 2014 5:46 pm Post subject: |
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Hi,
If it turns out that it's really the belly fans spinning, the problem could either be related to the CLM (not being able to control the power state of the LVPS correctly) or the LVPS (not responding to the CLM correctly). Try to swap one and/or the other if You have working spares...
Regards,
barclay66
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Jul 01, 2014 6:54 pm Post subject: |
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| draganm wrote: | | Curt Palme wrote: | | I'm pretty sure it's running fine, you're always supposed to hear the power supply fans run. they run at 1/2 speed, or some reduced speed even when the set is powered down. |
I've also noticed lately that these fans are getting really loud as they age. LVPS I just worked on sounded like someone grinding coffee even with machine turned off |
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Tue Jul 01, 2014 7:13 pm Post subject: |
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I'm just relating to Trent's opening post where he mentions the belly fans explicitly...
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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MarchingCRT
Joined: 14 Nov 2008
Posts: 36
Location: Baltimore, MD
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| Posted: Wed Jul 02, 2014 2:14 am Post subject: |
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I managed to double post the next entry and am editing this one so it won't show up twice.
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Trombone player by day. CRT nut by night.
Last edited by MarchingCRT on Wed Jul 02, 2014 2:21 am; edited 1 time in total
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MarchingCRT
Joined: 14 Nov 2008
Posts: 36
Location: Baltimore, MD
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| Posted: Wed Jul 02, 2014 2:19 am Post subject: |
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A few more details... Maybe I shouldn't say belly fans- When I turned off the projector, the fans remained at their louder state instead of ramping down. Tim, I have had your fan mod on my wish list, but it has not made it far enough up the queue yet! Also there was less clicking going on as I guess switches were not switching off. It is like the pj is going into the standy mode. The first time it happened, I thought it was just me. After enjoying a movie (and a couple martinis) I shut everything down and thought the pj sounded loud for being turned off, but the tubes were dark, so I unplugged the machine and didn't think much of it. The next time I watched something, everything went fine.
Last night, when I shut down the marquee, it did the same thing. I unplugged it and posted my question here. I then went back and plugged the machine in and it went right back to this 'standby state.' I could here the tubes crackling, but no picture until I hit the power button. The picture came on just fine, but the projector wouldn't shut all the way down when I pressed the power button. I unplugged it and went to bed. This morning, I plugged back in and everything sounded correct. I powered the pj on and off with no problem.
Maybe it is related, but my viewing habits changed at the first of the year. Instead of viewing 3-4 times a week, I was only turning on the pj once every couple of weeks and I started unplugging it after I shut it down. I thought maybe it would be better for the machine. Maybe not! Anyway, that is what I know and have observed.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Wed Jul 02, 2014 3:04 am Post subject: |
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Hello
Your lvps may be outputting +390vdc, powering the high voltage, when it shouldn't. A stuck relay perhaps. I have seen this once before. The +390 is near inaccessible by voltmeter without extender harnesses or soldering a wire inside the hvps to allow a measurement. You need a different lvps and maybe the fan mod also. I would have to study the bulkhead harness and see what wires go between the two AMP connectors to enable tapping in to measure. The proof for that would be to hear high voltage crackle sound when plugging in the power cord.
Last edited by Tim in Phoenix on Tue Sep 09, 2014 3:55 pm; edited 1 time in total
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MarchingCRT
Joined: 14 Nov 2008
Posts: 36
Location: Baltimore, MD
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| Posted: Tue Sep 09, 2014 2:02 am Post subject: |
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I found a lvps in my basement that I had saved from a marquee i had gotten dirt cheap off of ebay. I think that may be the only part that worked off that pj! I opened it up, dusted it out, then installed it. Everything powered up AND down.  Much queter, also. I haven't checked the heater voltage yet. I will get to that very soon. Thanks for pointing me in the right direction!
Trent
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Trombone player by day. CRT nut by night.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Tue Sep 09, 2014 8:49 am Post subject: |
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Does this mean that with the lvps mod a Marquee is quiet? Or do you mean no noise when it is in standby? How noisy is the Marque after these mods?
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