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mrfixit
Joined: 17 Jul 2008
Posts: 28
Location: Ypsilanti, MI
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| Posted: Sun Jul 11, 2010 5:53 pm Post subject: Marquee 8000 diagnosic LED's and an odd shutdown failure |
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This is a two part question; first the labeling of the diagnostic LEDs on the control board.
Some are obvious, but what are "C" and "EHT"?
Here is why I ask and well as "part II" of my PJ's failure last night...
I run my PJ from an HTPC with great results. About two months ago I did a capacitor rebuild (similar to Draganm's services) that resulted in a slightly better picture, as well as overall much better "stability" especially in convergence.
I watched a BluRay last night, start to finish and then decided to watch one of the extra features. Moments into that I got a loss of picture in a manner of fade in/fade out, blurry/no focus. Initially I presumed it was my newer Emotiva UMC-1 processor glitching (I love the UMC, but it still is suffering from some occasional firmware update issues being worked on). Power cycled the UMC, no go. Tired and late, I just shut everything down for the night.
Well I do have a PJ issue...It comes out of standby, the LED toggles to green, but no pix or even what looks/sounds like the CRTs lighting up. The remote function of "*" or help menus do nothing to bring it back/bring up menus. On close inspection I notice when issuing a remote command the "C" LED flickers/pulses when holding a remote key which looks like a response to the data stream from the remote (IR or wired).
After browsing the forums here I tried pulling the control board, pulled the daughter board, reseated everything and even noticed and replaced a "suspect" cap (C32 100m 25v - couldn't tell if it was leaky or some old glue, but what the heck). Checked the 3v battery which seems to still be holding 3.1v well.
Reassembled, but no joy (or change for that matter).
I'm suspecting a failure in the HV supply but wanted some feedback before tearing further into the beast. I need to try to keep my DIY repairs cheap in that I'm on month 4 of unexpected unemployment, and have had an unusually bad month with a string of failures in my life (car/lawn mower/PC LCD screen and now this...bleh).
Ideas?
Thanks in advance for any feedback...
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sun Jul 11, 2010 6:07 pm Post subject: |
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Hello
C is "COMM" to indicate a signal is incoming from a keypad or RS232. EHT is extra high tension, indicating something is inhibiting the high voltage. Unplug the 14 wire umbilical to each neckboard, do it one neckboard at a time. The neckboards had problems on 8000s and could falsely trip EHT inhibit.
Also, HVPS failure would not be uncommon. Also, check for a cracked tube face.
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mrfixit
Joined: 17 Jul 2008
Posts: 28
Location: Ypsilanti, MI
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| Posted: Sun Jul 11, 2010 6:12 pm Post subject: |
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| Nashou66 wrote: | Did you check the HDM board to see if it was seated well ? especially if its ceiling mounted.
Athanasios |
Probably should have mentioned that, but yes - HDM and focus boards are tight. Just pulled/reseated again before replying 
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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mrfixit
Joined: 17 Jul 2008
Posts: 28
Location: Ypsilanti, MI
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| Posted: Sun Jul 11, 2010 6:20 pm Post subject: |
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| Tim in Phoenix wrote: | Hello
C is "COMM" to indicate a signal is incoming from a keypad or RS232. EHT is extra high tension, indicating something is inhibiting the high voltage. Unplug the 14 wire umbilical to each neckboard, do it one neckboard at a time. The neckboards had problems on 8000s and could falsely trip EHT inhibit.
Also, HVPS failure would not be uncommon. Also, check for a cracked tube face. |
CRT's look fine. If there was a neckboard/EHT issue it -should- trip the LED correct? I asked about C/EHT LED's in that I didn't find quick info as to what they stood for...none of the reds are lit other than the bit of "C flicker" while pressing remote keys...At the same time I haven't yet recapped the neck boards, just HDM/Focus/Convergence-Vertical PCBs.
My gut says "HV" but I'm hoping for something simpler!
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mrfixit
Joined: 17 Jul 2008
Posts: 28
Location: Ypsilanti, MI
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| Posted: Sun Jul 11, 2010 6:25 pm Post subject: |
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| Nashou66 wrote: | you'll need to test a new HVPS then I guess. Any one near by?
Athanasios |
No one I'm aware of, but I suspect someone in Metro Detroit is out there...I'll prod the ultra-low-profile John Gannon and see if he has any leads in the area for me...And I have enough balls to at least open/look at the HVPS if it seems that that is the next place to go.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sun Jul 11, 2010 6:30 pm Post subject: |
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Hello
I would still try unplugging neckboards, one at a time.
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mrfixit
Joined: 17 Jul 2008
Posts: 28
Location: Ypsilanti, MI
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| Posted: Sun Jul 11, 2010 6:32 pm Post subject: |
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| Tim in Phoenix wrote: | Hello
I would still try unplugging neckboards, one at a time.
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Will do, and will report back...
Thanks all for the stream of consciousness!
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mrfixit
Joined: 17 Jul 2008
Posts: 28
Location: Ypsilanti, MI
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| Posted: Mon Jul 12, 2010 7:37 pm Post subject: |
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| mrfixit wrote: | | Tim in Phoenix wrote: | Hello
I would still try unplugging neckboards, one at a time.
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Will do, and will report back...
Thanks all for the stream of consciousness! |
Well, pulled the neckboard harnesses, no change, no initializing crackle of HV...
Going to pull the "non-serviceable" HV supply and take a look inside.
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Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
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| Posted: Mon Jul 12, 2010 11:27 pm Post subject: |
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I'm in cleveland (North Akronish). About two and a half hours from Detroit. I don't have a spare HVPS, but I may be able to help in some way, although what you described gives the impression you lost your HVPS.
_________________
~Paul
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mrfixit
Joined: 17 Jul 2008
Posts: 28
Location: Ypsilanti, MI
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| Posted: Wed Jul 14, 2010 6:53 pm Post subject: |
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OK - pulled and cleaned both the HVPS and LVPS.
HVPS had it's 2.5a fuse blown (but not "exploded" like another current thread going right now).
No visual signs of any overt damage, no swelling caps or "too hot over time" resistors etc.
Replaced the fuse, reassembled and turned it on.
No joy.
However I can hear a tick, tick. tick coming from (I -think-) the HVPS. It did not re-blow the fuse but I also didn't let it run long either.
Did this first with the 14 p neck harnesses off (all 3) and with them on. No difference.
Now at the same time I can't see the 390v neon lit either, so based on that other thread I'll look at the LVPS outputs as well (but not today...too hot).
Frustrating to say the least especially after all of the cap upgrades a couple months ago and the great picture I had been enjoying!
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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