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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Fri Jun 15, 2012 7:22 pm Post subject: v-fail |
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ok, this is weird, i get a v-fail on the clm and tried a new clm (incl known working dpb) and changed out the vdm and the ribbon cable and still no go.
i reseated the hdm and the lvps too and cleaned the contacts.
any suggestions are welcome.
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Fri Jun 15, 2012 7:50 pm Post subject: |
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The Vertical board itself. I had 2 fail back to back after having an H/V problem.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Fri Jun 15, 2012 9:13 pm Post subject: Re: v-fail |
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| dvh99 wrote: | ok, this is weird, i get a v-fail on the clm and tried a new clm (incl known working dpb) and changed out the vdm and the ribbon cable and still no go.
i reseated the hdm and the lvps too and cleaned the contacts.
any suggestions are welcome. |
Make sure the ribbon cable is connected correctly, it might be one pin off.
Nashou
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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 Jun 15, 2012 11:02 pm Post subject: |
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You've pretty much covered everything I'd change. Glycol on the backplane maybe? I'd scope the input and outputs of the V board to see if you have signal. Open yoke? (V deflection winding) V connectors on the V board off by 1 pin? I've done that too often to count...
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sat Jun 16, 2012 1:11 pm Post subject: |
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no, it`s not the backplane and not the ribbon cable.
the -5v however is just -1 1/2 volt on the motherboard so could that cause the v-fail?
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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 Jun 16, 2012 2:39 pm Post subject: |
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That can do it, but I've never had that before.
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Wed Jun 20, 2012 3:02 pm Post subject: |
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changed out (all at the same time with known working parts) lvps, vdm, hdm, clm and disconnected focus and the convergence board and still no go.
looks like a bad deflection yoke indeed, will try another tube probably tomorrow.
btw, if one yoke is bad all tubes are affected right?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jun 20, 2012 3:33 pm Post subject: |
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I'm not seeing where a yolk can pull down that -5v supply. It is tied directly to the vfail circuit and powers a few chips. I would be looking at that -5v supply very closely....
Of course you can try a yolk, you never know......
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daanbeo
Joined: 12 Oct 2010
Posts: 98
Location: netherlands
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| Posted: Fri Jun 22, 2012 12:31 am Post subject: |
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it`s not one of the tubes either, neckboards, or any of the cards.
i haven`t got the faintiest of what it could be.
still - 1 1/2v on the -5v supply even with another known good lvps.
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daanbeo
Joined: 12 Oct 2010
Posts: 98
Location: netherlands
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| Posted: Fri Jun 22, 2012 12:32 am Post subject: |
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oops logged in with my friends password.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 22, 2012 12:41 am Post subject: |
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VIM
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Fri Jun 22, 2012 12:44 am Post subject: |
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Hello
Look carefully for glycol leaks.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jun 22, 2012 12:49 am Post subject: |
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Yeah, and loose screws under mother boards.....
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Fri Jun 22, 2012 1:01 am Post subject: |
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this will probably be a complete overhaul of the projector.
ruled the vim out too btw.
will keep you guys updated.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Fri Jun 22, 2012 1:27 am Post subject: |
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yes, including the swb and dpb.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Fri Jun 22, 2012 7:50 am Post subject: |
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| dvh99 wrote: | | the -5v however is just -1 1/2 volt on the motherboard so could that cause the v-fail? |
Hi,
If the -5V is too low then several of the signal generators on the CLM won't work properly as the OP-Amps in those circuits use a symmetrical +5/-5V supply. So I would expect several effects. One could be that the vertical deflection waveform is not correct or missing and this would kick the V-Fail monitoring.
I've looked through the schematics and could see that the following boards make use of the -5V:
- Control Module (CLM)
- Contrast Modulation Board (CMM)
- Stigmator Waveform Board (SWB)
- Video Input Module (VIM)
- Video Neck Boards (VNB)
I would take out all of them and the LVPS and then measure the resistance between the -5V line and ground on the Motherboard's LVPS connector. If this tests OK (infinite resistance) then I'd plug in one board at a time leaving out the LVPS and repeat the measurement. If at one point You measure a value below some hundred Ohm You might have found the culprit. I believe that there must be some faulty board or circuit which draws the -5V line to ground.
I don't know about the specs of the -5V line so I don't know at which current it is specified. The 3A fuse on the VIM gives us a hint and we could expect it to be something around that value. So if there's a load drawing enough current so that only -1.5V are left then I'd expect it to have a quite low resistance (less than 10 Ohm).
Of course the problem could be related to the -5V generation, but -as You stated- You already changed the LVPS. The only explanation there could be two LVPS with the same fault (which I don't believe at this moment)...
Regards,
barclay66
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Fri Jun 22, 2012 9:18 am Post subject: |
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thank you barclay, that was a great idea.
the red neckboard was the culprit.
measured 9,5 ohms with the red neckboard attached btw  .
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Fri Jun 22, 2012 9:27 am Post subject: |
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Cool!
On this VNB either the CLC449 (U2) or some capacitor related to its pin 4 will most likely be completely shorted. The 9.5 Ohm You're measuring are of the filtering resistor R11 (10 Ohm)...
Regards,
barclay66
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Fri Jun 22, 2012 10:41 am Post subject: |
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right again, c4 was completely toast.
looking if i have some spare caps left here.
thanks.
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