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David_Web
Joined: 02 May 2007
Posts: 418
Location: Sweden
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| Posted: Thu Jul 24, 2008 8:30 pm Post subject: Marquee horizontal size flicker |
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I was making a quick setup now that I finally got my Marquee 7500 into place.
When first got it it worked fine the little I tested it before pulling it apart for bleeding, changing fans etc.
Now that I got it together I would not get a pic. I restarted it and got a H-fail light (was not on the first time as I checked).
I reseated the HDM and it powered up with the usual HV sound.
After a little while I noticed the image decreasing and going back again in horizontal size in a flickery kind of way (medium speed and smooth change)
(with no source btw)
So I think it is one of the parts feeding the HDM.
So my thoughts went to the CLM that houses the deflection processor amongst others.
Can I pull and re-seat the IC chips without a problem, also the daughter board?
I thought I should ask before trying.
Could it be a bad contact somewhere else?
Known fault?
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Thu Jul 24, 2008 9:12 pm Post subject: |
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Hello
Try reseating the HDM, and pad the HDM sleeve cover with 2-3 mm of layers of duct tape to support the weight of the board. If that doesn't help, try replacing C50 on the HDM, a large electrolytic near the bottom edge. Use a high-temp 105C replacement.
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David_Web
Joined: 02 May 2007
Posts: 418
Location: Sweden
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| Posted: Fri Jul 25, 2008 11:13 am Post subject: |
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Thanks.
I reseated the HDM and also the daughter board. Ill have to see if it helps later today.
My PJ is pedestal mounted so weight is not a problem.
It seems to be a lot of dust on the CLM and the chips. Would it be OK to pull them and clean? (ESD protection of course).
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Fri Jul 25, 2008 12:27 pm Post subject: |
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| David_Web wrote: | Thanks.
I reseated the HDM and also the daughter board. Ill have to see if it helps later today.
My PJ is pedestal mounted so weight is not a problem.
It seems to be a lot of dust on the CLM and the chips. Would it be OK to pull them and clean? (ESD protection of course). |
Yes you can either pull all the chips out on the CLM with an IC puller or try just pressing down on them a bit. Then if you can find denatured alcohol it be a nice idea to clean all boards with it, use a soft tooth brush and plenty of the alcohol. let air dry over night and use compressed air to blow out from under chips. Your Marquee will be happy too!!
Athanasios
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Fri Jul 25, 2008 5:32 pm Post subject: |
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| Nashou66 wrote: | | David_Web wrote: | Thanks.
I reseated the HDM and also the daughter board. Ill have to see if it helps later today.
My PJ is pedestal mounted so weight is not a problem.
It seems to be a lot of dust on the CLM and the chips. Would it be OK to pull them and clean? (ESD protection of course). |
Yes you can either pull all the chips out on the CLM with an IC puller or try just pressing down on them a bit. Then if you can find denatured alcohol it be a nice idea to clean all boards with it, use a soft tooth brush and plenty of the alcohol. let air dry over night and use compressed air to blow out from under chips. Your Marquee will be happy too!!
Athanasios |
That's also known as Methel Hydrate or camping fuel for the camp stoves.
I went to a few places looking for Denatured alcohol then I realized it has different names. I use it for work. Cleans up ink from plastic great.
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David_Web
Joined: 02 May 2007
Posts: 418
Location: Sweden
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| Posted: Fri Jul 25, 2008 8:10 pm Post subject: |
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I didn't notice any flicker today although I didn't run it very long so I hope that did it.
Now to another question. How can I squeeze the image even further vertically?
The normal mod is already done but it's not enough if I want to stay within the wear.
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SNR of people are ridiculously low.
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