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anqgiap
Joined: 25 Sep 2007
Posts: 43
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| Posted: Sat Mar 29, 2008 2:06 pm Post subject: Marquee 9500 Tubes Flashing |
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The Marquee 9500LC is acting up, when it's turned on; all three tubes just keep flashing, they went dark then bright at a slow rate. I can tell it tried to come up and seems that something causing it to restart. Does anyone know what could be the problem? Thanks.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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anqgiap
Joined: 25 Sep 2007
Posts: 43
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| Posted: Sat Mar 29, 2008 3:26 pm Post subject: |
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There is no indicator lights come on; I tried re-seat the HDM last night but no help. I'll try the power later.
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anqgiap
Joined: 25 Sep 2007
Posts: 43
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| Posted: Sat Mar 29, 2008 4:01 pm Post subject: |
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I tried re-seating the HVPS and LVPS but that didn't help. I suspect the HVPS has gone bad, I lived in Northern VA, is there anyone live in this area can help me testing it out please.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat Mar 29, 2008 4:08 pm Post subject: |
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I know there are a few people near you that have crt's and mike parker is also close by. One of them might have a HVPS to let you test. But if you didnt smell any electrical burning smell before this happened i suspect something else. One other thing that you could try it to remove all the chips on your CLM abd clean the contacts. Buy a chip puller from Radio shack and some craig contact cleaner. Be sure to do one chip at a time so you dont get them mixed up and also remeber the orientation of the chip to its carrier.
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
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Marquee Modifications and Performance Enhancement
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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 Mar 29, 2008 5:17 pm Post subject: |
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No, frankly don't do that. Pulling chips is a bad idea, but pressing down hard on each socketed chip should do the trick. BTW, it's CAIG contact cleaner, but generally that's not needed. I use it on the module contacts, but not the sockets. Too much cleaner and you can actually damage the chips or sockets, so I would not recommend going that far unless you're used to dealing with chips.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat Mar 29, 2008 6:37 pm Post subject: |
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| Curt Palme wrote: | | No, frankly don't do that. Pulling chips is a bad idea, but pressing down hard on each socketed chip should do the trick. BTW, it's CAIG contact cleaner, but generally that's not needed. I use it on the module contacts, but not the sockets. Too much cleaner and you can actually damage the chips or sockets, so I would not recommend going that far unless you're used to dealing with chips. |
Thanks for the info Curt! 
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
Marquee C-element and Bellow removal
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sat Mar 29, 2008 7:53 pm Post subject: |
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my money's on the HVPS, that's a common symptom of a bad one
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Zebu Fellenz
Joined: 21 Dec 2006
Posts: 2567
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| Posted: Sat Mar 29, 2008 7:59 pm Post subject: |
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Des it also seem to be going in and out of focus as is flashing. This would be a sign that the HVPS is dead or dying.
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anqgiap
Joined: 25 Sep 2007
Posts: 43
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| Posted: Sat Mar 29, 2008 8:18 pm Post subject: |
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Yep, I suspected the HVPS too. That's exactly what it is doing, going in and out of focus and flashing...I really need someone to test locally before getting a replacement.
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Gino
Joined: 22 Apr 2006
Posts: 1363
Location: Trinity Beach, AUSTRALIA
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| Posted: Sun Mar 30, 2008 2:44 am Post subject: |
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Could be VNB fault.
Taken from tech bulletin:
| Quote: | Symptoms: 1. The projected image disappears and then reappears too large and de-focused. It then shrinks to the proper size and focus. The disappearance and reappearance of the image may cycle continuously or may only occur on ocassion. This behavior is due to the high voltage/crt protection circuitry being tripped inadvertently by the VNB and shutting down the High Voltage module output. The de-focusing and shrinking image size are the observable effects of the High Voltage turning back on and increasing up to its regulated voltage. This effect is normal (not a VNB fault) when the projector is first turned on. The protection circuitry can be tripped if there is a vertical or horizontal deflection failure or if the amount of CRT current in any one of the CRTs exceeds the safety limit for X-ray emmisions. Normally, circuitry on the VNB detects the current within each CRT and then circuitry on the Video Input Module (VIM) limits the amount of current by automatically limiting the effects of the contrast adjustment.What has been happening on some defective VNBs is that the current detection circuitry has become faulty. This has allowed the current to exceed the specified limit enabling the protection circuitry thereby shutting down the High Voltage output. The cycling effect occurs because once the High Voltage output is shut off, the current is also shut off and the limit is then not exceeded and so the protection circuitry recovers, only to be enabled once the High Voltage turns on again.
In order to test for this fault, simply observe the behaviour of the projector at maximum contrast and brightness with red, green and blue turned on separately with an image requiring a large CRT current. To do this, use the keypad to adjust BRITENESS and CONTRAST to 100. Then Press the # key until the white-field test pattern is displayed. Press COLOR then press 1 to display red only. If the high voltage cycles as described above, then the VNB on the red CRT is defective. Press COLOR then press 2 to display only green. If the high voltage cycles as described above, then theVNB on the green CRT is defective. Also, check the blue VNB by pressing COLOR then pressing 3. Press COLOR 8 to enable all the colours (white). The problem will not necessarily show up if two or more colours are displayed even though one of the VNBs of one of the displayed colours is defective. The reason for this is that the limiting circuitry on a properly functioning VNB limits the contrast adjustment which controls all three colours thereby helping to limit the current on the defective colour and so the problem may not show up. This then explains why the testing must be done on each individual colour alone. This also explains why the problem may appear on ocassion only. For instance when observing a video tape, the ratio of red to green to blue CRT current is constantly changing as the video tape content changes. If, for example, the red VNB is defective, then the image must have a high ratio of red to blue and red to green before the defective red VNB will trip the protection circuitry. If there is plenty of red and green in the image, then the green limiting circuitry may prevent the problem in the red protection circuitry from showing up. As well, turning down the contrast or brightness will reduce the incidence of protection circuitry enabling and the associated High Voltage shut down with its undesirable visual effects. When confirming this particular problem, make sure that the HFAIL or VFAIL LEDs on the control module do not come on. If they do, this is an indication that the High Voltage shutdown has been initiated by a deflection failure not a VNB failure.
2. A sudden or gradual increase in apparent brightness (or background intensity) of one of the colours which becomes permanent can be observed. This is due to premature transistor failure on one of the VNBs. The VNB corresponding to the colour that increased in itensity should be replaced. Although changing the G2 adjustment (in the password protected service menu) may apparently solve the problem, this is not recommended since the performance and reliability of the VNB has been compromised.
3. Displayed text or characters appear to have trailing shadows or shading. Use the COLOR-1-2-3 testing described in 1. (above) to determine which colour’s VNB is potentially at fault. Try swapping VNBs from a good CRT/VNB combination with the one you suspect is faulty. These symptoms are similar to having improperly terminated video signals/cables. Check cables etc. before proceeding with the swap to determine which VNB is at fault.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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anqgiap
Joined: 25 Sep 2007
Posts: 43
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| Posted: Sun Mar 30, 2008 2:38 pm Post subject: |
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This is good info Gino; the problem is that there is nothing projected on the screen so it's slightly different from what being described in the bulletin. I'll try to shut down each gun as suggested here to see if I can get an image on the screen. Besides, what is VNB (something with neck board attached at the end of each CRT?)
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anqgiap
Joined: 25 Sep 2007
Posts: 43
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| Posted: Sun Mar 30, 2008 3:07 pm Post subject: |
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I followed the instruction, the PJ does not respond to any of the commands suggested. The problem is the no image on the screen so I have no idea what is going on and looking at the CRTs, they just keep flashing. I could hear the HVPS cranking but it sounds like it runs out of steam...
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