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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: Mon Dec 01, 2014 1:51 am Post subject: |
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The whole neck board
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 01, 2014 2:00 am Post subject: |
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Ahh ok now I will have to do that
Good thing I already have the top off the set
I am
So glad Black Friday is over with as i was working almost non stop and it's like to drive me crazy:p
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crt king of black
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 01, 2014 2:03 am Post subject: |
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The green tube just blinked off
Arrg I now wonder if it's the hvps(I do have a spare)
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crt king of black
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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: Mon Dec 01, 2014 3:11 am Post subject: |
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Probably not, but try it.
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 01, 2014 3:19 am Post subject: |
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| Curt Palme wrote: | | Probably not, but try it. |
Ok I know my spare hvps works so first chance I get around to it I will swap it in and see if the issue remains
I think I need to get the power supply for my twin before my marquee needs parts(don't want both sets down)
I have noticed the tubes would get slightly brighter then back to normal then they would get slightly dimmer then back at times before the tubes would randomly blink off
Also every time a storm would be near and lightening strikes somewhere it would make the tubes shut off for said split second (it's been doing that for about six months)
Hence why I am thinking it's the hvps
I also have a spare lvps just in case I need it
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crt king of black
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 01, 2014 3:20 am Post subject: |
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I meant dwin(stupid autocorrect)
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 01, 2014 3:33 am Post subject: |
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| Nashou66 wrote: | Does it go out of focus at all ?
Nashou |
Nope
You can see a very faint image on the blue tube when it does this(can't read anything on the screen of the tube to tell if it loses focus or not it's that dim)
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 01, 2014 4:04 am Post subject: |
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Ok I just powered it back on and bam no blue so I got a couple pics and also tried the convergence(doesn't work at all when the tube blacks out)
Screen pic
Blue tube pic(it does look like it loses focus best that I can tell)
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 01, 2014 4:05 am Post subject: |
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The pic above is the brightest it's been when it decides to go dim any other time it's almost black (this is with the lights off)
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Mon Dec 01, 2014 4:27 am Post subject: |
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| Nashou66 wrote: | Might be the G2 for the Blue is going bad in the HVPS. Are you sure you tried the Blue VNB on the red Tube and the red VNB on the blue to make sure its not the VNB?
Nashou |
Not yet
Going to swap them around and see if it follows the board or not
Will update
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Tue Dec 02, 2014 12:32 am Post subject: |
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Well bad news I swapped the neck boards between the green and blue tubes and the green is now dead
So I need a new neck board 
Now both projectors are down and I am using my Sony projection tv(it beats nothing)
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Tue Dec 02, 2014 3:58 am Post subject: |
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| Nashou66 wrote: | I bet it might be a loose resistor , one of the 33 ohm carbon comp ones that sticks straight up and is covered with a clear plastic
shield to protect a short from the Metal plate.
Nashou |
That would explain why it was a intermittent issue and seemed to do it the most at first power up(cold)
Is it possibly fixable??
I did have a electronic service manual for the marquee chassis that I found online but I think it may have got deleted or is buried in my laptop's hard drive somewhere as I hav been able to find it (just when I needed it)
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Tue Dec 02, 2014 8:16 am Post subject: |
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| Nashou66 wrote: | I bet it might be a loose resistor , one of the 33 ohm carbon comp ones that sticks straight up and is covered with a clear plastic
shield to protect a short from the Metal plate.
Nashou |
Once I had a simlar fade-out problem, and there the 1uf ceramic cap in the upper section of the VNB had some intermittent conduction. It was odd...
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Tue Dec 02, 2014 3:26 pm Post subject: |
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I may give the board a once over when I get the time to
I am going to get a back up from curt till I can(may eventually get a set of neck boards to have as spares)
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