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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: Sun Sep 20, 2009 11:05 pm Post subject: |
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Nice find Dragan (yuck!), but I'll say that set had to have been in a really hot environment for a long time to be like that. THe highest hour 8500 I had in was 68,000 hours from 1996, I got it in last year. As an experiment, I retubed it, and installed it locally at a discount. I was upfront with the customer, saying that I'd replace the set at any time if it showed drift at all. I ran it here for 2 weeks, and it was completely solid in operation, and remains so to this day.
That one above to me is an oddball/or as I said, was misinstalled.
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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: Sun Sep 20, 2009 11:09 pm Post subject: |
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| draganm wrote: | had to post this pic. Was up late last night working on a Marquee convergence board. It's been stated by some people that "Marquee's can run forever practically and that most of the EL caps will be fine, No need to worry".
This is a sample of what I pulled last night. I'll say it again, these things are not designed to last 15 years |
This is what happens when you don't do your magnetics correct. 
_________________
Firefly rules. Can't stop the signal.
http://www.hulu.com/firefly
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Sat Jan 16, 2010 3:56 am Post subject: |
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There are a couple of sellers on ebay who sell the right caps for your motherboard and they don't cost much. I laid in a small stash of them, myself.
I'd say it's worth recapping a good motherboard, so long as it's still working when you decide to recap it. If it stops working, it probably
has been damaged by the cap failures.
The reason for early cap failures is that the electrolyte formula is wrong in them. They're using a formula that was stolen from a major
capacitor manufacturer, in a bit of industrial espionage, but the catch is that the stolen formula was INCOMPLETE. It was for a new
electrolyte that was under development and not completed yet.
This formula got used by a large portion of the capacitor industry...and they all fail short of a cap's normal expected life.
CJ
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Jan 16, 2010 4:40 am Post subject: |
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Hmmmmmmmmmmmmmmmm.......................... 
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Mar 10, 2010 5:50 pm Post subject: |
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here's another one. Marquee control module problems last couple years have been rather common. It used to be you could just pull the socketed chips, clean them wtih de-oxit, and evrything would be fine. Not so sure anymore? This is the deflection processor daughter board on the CLM, one of the two 220uf 25V caps. I like to replace these with Nichikon 220uf 50V HE series. Needless to say when this board starts to fail you will get all kinds of wierd anamoly's in the image as well as random shut-downs from scan failure detections. This a 1996 8500 with 2500 hours on the clock from florida,though the hour counter might have been re-set.
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Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
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| Posted: Wed Mar 10, 2010 6:06 pm Post subject: |
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Drags, just curious, I'm not used to seeing heat damage on the legs like that unless it was from serious heat from a soldering iron. What are you using to rework boards? I also some others where pads pulled off or the solder snapped off the pad cold. Are you using a rework station? What do the top of the cap bodies look like
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~Paul
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Wed Mar 10, 2010 8:41 pm Post subject: |
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| Sparky015 wrote: | | Drags, just curious, I'm not used to seeing heat damage on the legs like that unless it was from serious heat from a soldering iron. What are you using to rework boards? I also some others where pads pulled off or the solder snapped off the pad cold. Are you using a rework station? What do the top of the cap bodies look like |
Not sure what you mean by "heat-damage"? The brown colored residue is corrosive eletrolytic that has leaked out of the cap.
| Sparky015 wrote: | | What are you using to rework boards? I also some others where pads pulled off or the solder snapped off the pad cold. Are you using a rework station? What do the top of the cap bodies look like |
Are you talking about my work? I don't recall doing anything for a customer in Cleveland?
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