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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Sep 29, 2009 4:42 pm Post subject: wierd anamoly on Marquee red tube |
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This is a red tube over at a friends house in an 8110. I haven't driven down there yet but was hoping for some suggestions on what boards to bring? I don't remember ever seeing this before except from a really old Multi standard decoder on a 1993 8000. In that case the "meteor shower" was on all 3 tubes.
| Quote: | for the past two weeks the projector has been showing a diagonal band of dotted red lines both on Blue Ray and broadcast TV. It is most noticable on dark images.
The diagonal lines are made of many dots that are "raining" downward. They are spaced about two inches apart. They show on all red images and spill into the black and very dark areas. They scrol at various speeds. When push the # I can only see the lines on the bars of various dark. I can't see the lines on the grids. I hope this helps! |
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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: Tue Sep 29, 2009 4:50 pm Post subject: |
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Sounds like V blanking issues?
Try the heatsink, CLM and VIM.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Sep 29, 2009 7:02 pm Post subject: |
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| Curt Palme wrote: | Sounds like V blanking issues?
Try the heatsink, CLM and VIM. |
thanks Curt. This is an original 40K hour VIM so I'll get it swapped out. the other boards were re-built and tested recently, so less likely.
| Nashou66 wrote: | Drags tell him to swap VNBs and see if it follows
Athanasios |
Glen's not a part swapper, but he's not too far away either. 30 minute trip after work usually
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Wed Sep 30, 2009 12:58 am Post subject: |
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Almost sounds like what happens when the heater wires on the neck card are pressed down on the circuit board. Try pulling the wires up and away from the board.
Scott
_________________
"Were we directed from Washington when to sow and when to reap, we would soon want bread."
Thomas Jefferson
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Wed Sep 30, 2009 1:08 am Post subject: |
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| tse wrote: | Almost sounds like what happens when the heater wires on the neck card are pressed down on the circuit board. Try pulling the wires up and away from the board.
Scott |
Oh yeah Scott!!! Good Call!! thats why its always a good thing to move the heater wires tot he underside of the board, a pain to do but still doable.
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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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Sep 30, 2009 6:03 am Post subject: |
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thanks Scott, another good suggestion. I'll check it.
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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: Sun Oct 04, 2009 7:52 am Post subject: |
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It is best to re-locate the wires under the board, this improves the image lots.
Takes about 15mins per board if you are doing it right.
Cheers
Steve
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sun Oct 04, 2009 6:43 pm Post subject: |
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| HK-Steve wrote: | It is best to re-locate the wires under the board, this improves the image lots.
Takes about 15mins per board if you are doing it right.
Cheers
Steve |
steve do you re-use the same wire or?
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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 Oct 05, 2009 6:04 am Post subject: |
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I use the same wire,
but I also add some ferrite beads on each end, opps did I say that out loud 
Cheers
Steve
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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 Oct 05, 2009 1:24 pm Post subject: |
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I agree with you Athanasios about the Jarmo mod.
but I do my mod a little different, sorry, no info as this is a bit of a secret of mine, lots of time invested 
Cheers
Steve
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Mon Oct 05, 2009 3:28 pm Post subject: |
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| Nashou66 wrote: | | HK-Steve wrote: | I use the same wire,
but I also add some ferrite beads on each end, opps did I say that out loud
Cheers
Steve |
If you use jarmos heater filament filter those are not needed! 
Athanasios |
it seems easier to just add the inductor at each VNB no? Might also be more effective since your doing it right at the card. then again JArmo uses a fairly large inductor + cap+ a couple of beads which looks to be very effective on the scope. I doubt you could cram all this stuff on the VNB under the heat-sink
Edit: moving this to Marquee maint. thread
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Mon Oct 05, 2009 6:24 pm Post subject: |
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| draganm wrote: | | Nashou66 wrote: | | HK-Steve wrote: | I use the same wire,
but I also add some ferrite beads on each end, opps did I say that out loud
Cheers
Steve |
If you use jarmos heater filament filter those are not needed!
Athanasios |
it seems easier to just add the inductor at each VNB no? Might also be more effective since your doing it right at the card. then again JArmo uses a fairly large inductor + cap+ a couple of beads which looks to be very effective on the scope. I doubt you could cram all this stuff on the VNB under the heat-sink
Edit: moving this to Marquee maint. thread |
Like jarmo mentions on the MMPE thread, the beads only address the noise to the heater elements, the reason cleaning up
right at p14 is it clears up any noise that can be transmitted to the other voltage rails in the umbilical cord which is all bunched together. My idea was a filter at each umbilical cord(after) but i milti filter for each voltage rail that goes to the vnb.
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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HK-Steve
Joined: 15 Jul 2006
Posts: 849
Location: Switzerland
TV/Projector: Marquee 9500, Epson 8100
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| Posted: Tue Oct 06, 2009 6:41 pm Post subject: |
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This for 'me' makes no difference as I sheild the cables away from all others.
I have added my own sheilding for each voltage on all looms in the Marquee chassis.
Cheers
Steve
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Tue Oct 06, 2009 7:56 pm Post subject: |
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the only thing Steve hasn't thrown into his MArquee is the kitchen sink 
Thanks for the tip on the Ferrite beads, looking forward to trying those. 
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