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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Thu Dec 10, 2009 10:50 am Post subject: Marquee 9500 1/4 brightness on all 3 tubes |
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Hey Everyone,
Last night had a strange thing happen to my Marquee 9500,
after 5 hrs of watching yesterday, the screen went blank. No error lights on LVPS or CLM.
I looked into the tubes and saw an image, but very dim,
I turned up brightness from the original 42 to 65 and the brightness increased, but not enough to light the screen.
Changed out my LVPS, made no difference.
My HVPS was replaced about 1 month ago, but I don't have any spare to change out to test.
The startup crackle of the HV sounds normal, so I am not sure if the HVPS is faulty.
Next I will check the CLM and pull the CMM.
Anyone had this problem before??
Appreciate your comments/help
Cheers
Steve
Last edited by HK-Steve on Thu Dec 10, 2009 11:12 am; edited 1 time in total
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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Thu Dec 10, 2009 11:12 am Post subject: |
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Update,
I pulled the CLM, did the normal DPB and SWB off, cleaned contacts, then replaced the boards.
Made no difference, still the same problem.
Next I pulled the CMM, I lost the image, couldn't even get up the test grids.
Put the CMM back in, the image came back, STRANGE, but problem still there.
Next is the HDM, and check the FCM.
Cheers
Steve
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Thu Dec 10, 2009 11:28 am Post subject: |
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Pull your VIM
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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: Thu Dec 10, 2009 3:05 pm Post subject: |
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if it's floor mounted, maybe some glycol got under the chip on the backplane? I've had that cause loss of brightness, but usually via flickering, not solidly dim.
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Fri Dec 11, 2009 1:13 am Post subject: |
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Low heater voltage can cause low light output.
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Fri Dec 11, 2009 9:50 pm Post subject: |
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| tse wrote: | Low heater voltage can cause low light output.
Scott |
Locate motherboard connector P14 near the rear of the blue tube. Connect a dc voltmeter and power the projector fully On, you should be seeing around 6.35 volts dc.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Mon Dec 14, 2009 9:03 am Post subject: |
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Hey Guy's,
Had a busy weekend with Christmas parties and dinners, so no time to report back.
Projector is ceiling mounted.
I pulled the HDM and FCM, put in some spares, still same problem,
Next I pulled the VIM and changed to an 02, Fixed.
So now I have to work out what is wrong with the VIM.
I can see nothing visible or damaged on the board, so I will get stuck into the schematic to see what I can find.
Appreciate all the comments and suggestions.
Cheers
Steve
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Mon Dec 14, 2009 9:51 am Post subject: |
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Check your 14 volt rails........
There's two 4.7 ohm resistors right at the connector. They won't blow or go bad at random. If one is open, it's likely you have a short (or excessive load) on your 14 volt rail.
Hmm.... also check the two fusible (green) resistors right next to the 4.7's - one thing I know for sure, you have a rail out.
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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Mon Dec 14, 2009 10:46 am Post subject: |
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Thanks Mike,
I will check those today when I can get a chance.
Cheers
Steve
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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Sat Jan 23, 2010 1:06 pm Post subject: |
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OK, Been a while since I had some time to look at the problem with my 03P VIM,
Found that all the fuses are good, F1, F2, R10 and R12
Not found any bad capacitors, and everything looks good.
Forward I move on, and see what else I can find.
Cheers
Steve
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sat Jan 23, 2010 3:24 pm Post subject: |
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How do you check G2 voltage at the neck board??? and what is it supposed to be???
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Sat Jan 23, 2010 5:07 pm Post subject: |
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Don't. G2 voltage is high enough that it'll fry most voltmeters. It can be up in the 800 volt range. And it can hurt you, BAD.
CJ
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sat Jan 23, 2010 5:39 pm Post subject: |
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| cmjohnson wrote: | Don't. G2 voltage is high enough that it'll fry most voltmeters. It can be up in the 800 volt range. And it can hurt you, BAD.
CJ |
Measure at the tip of R76 on a neckboard, 500 to 630 volts dc is nominal. That will not harm most voltmeters.
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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Sat Jan 23, 2010 6:54 pm Post subject: |
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As Tim replied,
normal is around 500 to 700v from what I have found,
The multimeter MUST be able to measure up to 1000v to be sure you won't damage it, or yourself.
My Fluke 87 is up to the 1000v challenge, and also very accurate, well worththe money I paid for it 10 years ago.
Cheers
Steve
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