Return to the CurtPalme.com main site CurtPalme.com Home Theater Forum
A forum with a sense of fun and community for Home Theater enthusiasts!
Products for Sale ] [ FAQ: Hooking it all up ] [ CRT Primer/FAQ ] [ Best/Worst CRT Projectors List ] [ Setup Tips & Manuals ] [ Advanced Procedures ] [ Newsletters ]

 
Forum FAQForum FAQ   SearchSearch   MemberlistMemberlist  Photo AlbumsPhoto Albums  RegisterRegister 
 MembershipClub Membership   ProfileProfile   Private MessagesPrivate Messages   Log inLog in 
Blu-ray disc release list and must-have titles. Buy the latest and best Blu-ray titles to show off in your home theater!


Marquee 9500LC neck board question

 
Post new topic   Reply to topic   Printer-friendly view    CurtPalme.com Forum Index -> CRT Projectors
View previous topic :: View next topic  
Author Message
rotoscoped



Joined: 08 May 2017
Posts: 18
Location: Virginia


PostLink    Posted: Wed Feb 19, 2020 12:52 am    Post subject: Marquee 9500LC neck board question Reply with quote


        Register to remove this ad. It's free!
I've attached a photo of the neck board on the blue tube of my Marquee 9500LC and an "example" photo of a Marquee neck board from Tim's ETech Marquee LC tube removal guide (pic 18) for comparison.

When removing the blue tube several months ago (replacing glycol), I noticed a few areas on the neck board of what appear to be exploded transistors (?). I'm not sure if this is damage or some kind of modification (I don't know anything about circuit boards). The projector was and is running well, the damage (if it is damage) appeared to be done (versus an ongoing leak or burn), so I wasn't especially concerned. I took a picture, though, to ask about it here.

I've been using the PJ for about 18 months without any real issues. Occasionally, after a couple hours of use, the tubes will flicker on and off for a minute or two (ie. red tube will flicker off briefly, leaving just blue and green on for that moment, then red will come back on, and vice versa usually a combination of all three cycling on and off). This will go on for a minute or two, then everything returns to normal. And sometimes weeks will pass without it happening at all. I've believed this to be related to the HDM as adjusting and "reseating" the HDM on my ceiling mounted projector seemed to reduce or eliminate the flickering in the past. So perhaps unrelated, but I thought worth mentioning.

My neck board:


"Example" Marquee neck board from ETech site:
Back to top
Tim in Phoenix



Joined: 21 Oct 2006
Posts: 4254
Location: Phoenix


PostLink    Posted: Wed Feb 19, 2020 2:27 pm    Post subject: Reply with quote

Hello

Several parts have been replaced, and added, consistent with Mike Parker modifications. He placed black sealant in spots also.

It would be difficult to troubleshoot your flickering issue since it happens so fast and then clears itself.
Back to top
kal
Forum Administrator


Joined: 06 Mar 2006
Posts: 15972
Location: Ottawa, Canada

TV/Projector: JVC DLA-RS56


PostLink    Posted: Wed Feb 19, 2020 2:58 pm    Post subject: Reply with quote

To add to what Tim wrote: The black sealant / potting ("goop") you are seeing was added by Mike Parker on top of parts he replaces as part of his performance enhancements in order to hide the changes so that it can't easily be copied by others. They're not exploded transistors.

Can't help with the flickering.

Kal

_________________

Support our site by using our affiliate links. We thank you!
My basement/HT/bar/brewery build 2.0
Back to top
View user's photo album (18 photos)
Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23813
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Sat Feb 22, 2020 7:32 pm    Post subject: Reply with quote

Sounds to me that the problem is not CRT neck board related, but possibly CLM or HVPS. Pull all boards, use Caig D5 DeOxIt to clean all module contacts, and reassemble.
Back to top
rotoscoped



Joined: 08 May 2017
Posts: 18
Location: Virginia


PostLink    Posted: Mon Feb 24, 2020 9:17 pm    Post subject: Reply with quote

Thanks so much for the replies and information. I have some documentation from the previous owner about the neck boards and VIM having MP mods, but I was not able to confirm this on my own. Great to know.

The flickering hasn't cropped up in a couple weeks (usually it does only after the projector has been in use consecutively for 3 to 4 hours, and lately it hasn't been). I'll try the DeOxIt, Curt -- thanks for the tip. Just clean the areas where the circuit boards "seat" into the projector?
Back to top
Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23813
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Mon Feb 24, 2020 10:14 pm    Post subject: Reply with quote

Yes, correct.
Back to top
Display posts from previous:   
Post new topic   Reply to topic   Printer-friendly view    CurtPalme.com Forum Index -> CRT Projectors All times are GMT
Page 1 of 1
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum