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derfla
Joined: 11 Mar 2006
Posts: 547
Location: eastern ohio
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| Posted: Fri Dec 30, 2011 7:57 am Post subject: · · · — — — · · · marquee 8500 no picture |
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I have come to the conclusion that I need help. My son went down stairs christmas morning to play his new game and couldn't get it to come on. No picture on the screen. Turns out it turns on just no picture. No fail lights. Projector appears to power up and make normal static snap crackle pop sounds. Internal patterns do not work. When I raise and lower the contrast I hear a change in sound in one of the boards on the back swing down panel. Have tried swapping every board and both power supply.
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| picture of projector and spare parts. |
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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: Fri Dec 30, 2011 2:08 pm Post subject: |
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Measure the G2 leads to see if the HV shuts down after it comes up. The G2 should be between 500 and 800 volts per lead on each tube. That will tell you if the HV is staying up.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Fri Dec 30, 2011 2:13 pm Post subject: |
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Hi,
Have You verified that the filament voltage is present -that is- if the tube necks show the orangeish glowing?
Regards,
barclay66
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Fri Dec 30, 2011 2:38 pm Post subject: |
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Do what curt says, if you have no HV you might have bad neck board. You said you changed out all boards so I assume you did the Vim? But I bet not the VNB's since they are harder to do a quick swap. If so then remove one at a time the black umbilical cords going to each tubes VNB and start up. Reconnect as you move on to the next VNB. It will fire up the when the bad VNB is removed, the spotkil circuit might have kicked in.
Athanasios
_________________
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derfla
Joined: 11 Mar 2006
Posts: 547
Location: eastern ohio
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| Posted: Fri Dec 30, 2011 6:48 pm Post subject: |
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the tubes do not glow. and going off the sound it makes i would say the HV is not staying up but i will check the G2 and vnb as soon as i get a chance.
Last edited by derfla on Sat Jan 07, 2012 1:20 am; edited 1 time in total
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Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
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| Posted: Sat Dec 31, 2011 1:27 pm Post subject: |
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If you have HV, your CLM may be suspect, but if you changed it then this post might be worthless to you. Normally I find if the machine is operating normally with no error lights and you have HV but no picture, its normally the CLM. You will know more after checking the G2 and the neck boards. Not sure where you are in eastern Ohio, but I am in the northern Akron area if you need a hand. Good luck!
_________________
~Paul
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derfla
Joined: 11 Mar 2006
Posts: 547
Location: eastern ohio
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| Posted: Sat Jan 07, 2012 1:20 am Post subject: |
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do i remove the lead from the tube pin to take the reading?
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derfla
Joined: 11 Mar 2006
Posts: 547
Location: eastern ohio
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| Posted: Sat Jan 07, 2012 1:36 am Post subject: |
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I pulled the G2 wire off and probed that wire. when i did this the blue tube light up then I turned it off because i did not expect that. is that normal?
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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: Sat Jan 07, 2012 2:27 am Post subject: |
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You pulled it off the tube pin? BAD MOVE! You may have spot burned the tube at turnoff!
If you pulled the G2 lead off the CRT neck board going to the HVPS, then you're OK.
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derfla
Joined: 11 Mar 2006
Posts: 547
Location: eastern ohio
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| Posted: Sat Jan 07, 2012 2:35 am Post subject: |
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nope pulled it off of the tube pin. looked ar the tube face did not see any "spot". my meeter says 4V DC on R74.
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