Hey Everyone,
Well it has finally happened, after about 5 months with the covers "ON" my projector, My Wife has been so happy that I am not modifying and testing anymore , I have my first real problem.
My 9500 has been running faultless for all that time, watched lots of Blu-ray movies
on Tuesday I turn ON the projector and after 5 mins, the screen goes blank the have been tubes shut down, No HV.
No led's on the CLM, Shutdown the projector, power off, restart projector, doesn't fix.
Replace the HVPS with my spare, which then runs until last night.
I can hear a relay clicking in the LVPS, HV ON, then the relay clicks, HV Off. a cylce every 2 seconds approx.
Picture zooms in when HV comes back on.
Replace LVPS, still same problem, removed Focus board, still same problem.
Pull VIM, check all fuses, all good.
Pull the HDM, and remove Daughter Board, clean pins, re-install the boards, still same problem.
Changed VIM for my spare, same problem.
My suspect is the HDM, am I looking in the right place??
I don't have a working spare, so I don't have a chance to test if I am correct.
Link Posted: Fri Jul 03, 2009 8:56 am Post subject:
OK, Some more info,
I have been trying a few things this morning, and have found the following.
I can get the internal crosshatch test paterns up and running, which does not turn the HV OFF,
but the full white field Turns it OFF, then does the 2 second on off bit..
I could also watch a little TV, until the white level of the image was over about 60%, then the HV would turn OFF, ONetc.
So Next is the VNB's, would this be the next place to look??
Link Posted: Fri Jul 03, 2009 9:27 am Post subject:
HK-Steve wrote:
So Next is the VNB's, would this be the next place to look??
Cheers
Steve
The problem is most likely one of the next boards.
Do this test, with the projector running (when it's pulsing off/on) - press "COLOR" on remote, then 1 (red) - 2 (green) - 3 (blue).
If that does not isolate the problem, do the same (press color) and then 4 (green/red) - 5 (green/blue) - 6 (blue/red).
Do so staying into each button change for at least 10 seconds. Use the full white field internal test pattern.
This should help to isolate which neck board. If it's not the neck board, the VIM is suspect. The circuit that mutes the video and shuts down the neck boards is on the VIM. That circuit has only been known by me to fail when the projector has had HV flashing (HV arching) problems.
Link Posted: Fri Jul 03, 2009 9:29 am Post subject:
HK-Steve wrote:
OK, Some more info,
I have been trying a few things this morning, and have found the following.
I can get the internal crosshatch test paterns up and running, which does not turn the HV OFF,
but the full white field Turns it OFF, then does the 2 second on off bit..
I could also watch a little TV, until the white level of the image was over about 60%, then the HV would turn OFF, ONetc.
So Next is the VNB's, would this be the next place to look??
Cheers
Steve
Sounds like it shuts down when beamcurrent gets high. Probably one of VNB`s or VIM. _________________ Marquee 9500LC (Frankenyokes / Thomas electric tubes / HD-10L / +many mod´s)
DVDO VP-50
New hobby, Rally (service man)
New video
http://www.youtube.com/watch?v=vX2Rtpr1njs&feature=g-upl
Link Posted: Fri Jul 03, 2009 10:03 am Post subject:
Thanks for the comments, but, no go,
I can turn on each tube individaully, and it still goes through the 2 second cyle of on and off.
I can get contrast down from the original 56 to 26 and it will run, but after 2 mins, starts the cycle again.
Brightness is at 44 for my night setting, but it doesn't make any difference either when turned down
The VIM was changed to my spare, but does the same thing.
Link Posted: Fri Jul 03, 2009 11:10 am Post subject:
HK-Steve wrote:
The HDM is only board which has not been changed, think that it is the HDM??
Steve
The HDM could cause this, but not when the brightness is increased. That would indicate something in the video chain, mainly the neck boards.
The only other thing I'm thinking about is what you mentioned here:
HK-Steve wrote:
Replace the HVPS with my spare, which then runs until last night.
I can hear a relay clicking in the LVPS, HV ON, then the relay clicks, HV Off. a cylce every 2 seconds approx.
Picture zooms in when HV comes back on.
Replace LVPS, still same problem, removed Focus board, still same problem.
Steve
In that instance, when the relay was clicking, the LVPS is indicating what usually happens when there's an unusual load on one of the rails.
You should pull the front cover and watch for which LED blinks when this happens. If you have the LED chart, it would inicate the voltage rail that would be causing this.
If all is fine with the image when it's working, the problem is most likely caused from having too much capacitance on the rails. Which for some reason, that LVPS does not like to see high capacitance on the rails. The main place to check for this would be the CLM. It's very important to NOT over-cap those rails.
The second place that would cause this is either of the +/- 85 volt rails, which are on the neck boards and C50 on the HDM.
Joined: 12 Jan 2007 Posts: 12848 Location: West Seneca NY
TV/Projector: Marquee 8000, 8500 And a 9500LC RetroIV , 2 Longbow 8500 Ultras(2004!!)Hd145's , Ampro 3600, a G90!!
Link Posted: Fri Jul 03, 2009 12:13 pm Post subject:
First off you sound like you have the same problem i have had. if you check on the Vim where the I-Over signals come in you might have a problem there.
here is a link TSE sent me with voltages to check on the Vim.
See attachment
The other problem your showing with the lines is most likely the DPB chip U7. there is a thread on AVS about that with the same pics.
Athanasios
download.php 1600×1200 pixels.GIF
Description:
Spotkill voltages
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33.96 KB
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72 Time(s)
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"The government can't control the economy without controlling the people" RR
One Smart Dog!!! Tom Bauerle to Andre Cuomo" Elliot Spitzer Screwed some Prostitutes, you screwed the Constitution" On his call to Cuomo to Resign!!!
Link Posted: Fri Jul 03, 2009 3:11 pm Post subject:
Right, I have done some more testing, this is what I have done.
There are no LED's showing on the LVPS when the relay clicks, or even at any stage of startup.
Even with 1x VNB connected it still happens, each color by itself, does not fix the problem,
can I run with no VNB's connected ??
I changed my CLM and DPB, still happenns,
The VIM has been changed 3 times an 03p, 02p plus a 2005-03p version., still happens
I will check the voltages on the VIM with my extension kit later,
but if the voltages are wrong, then what board does it point to for the fault??
The lines were a problem with my CLM Main Board, DPB was OK. CLM was replaced.
So at the moment,
I am running a stock LVPS, HVPS, CLM, FCM, HDM and daughter board, VIM. still the same problem.
I will pull the VNB's out for a visual inspection,
but I think I am wasting my time, as I don't think this is where the problem is.
So, thinking of the HV, could the splitter cause this?? (thinking out loud)
Joined: 03 May 2006 Posts: 1005 Location: Sweatbucket, Fl.
Link Posted: Fri Jul 03, 2009 8:02 pm Post subject:
Nashou66 wrote:
First off you sound like you have the same problem i have had. if you check on the Vim where the I-Over signals come in you might have a problem there.
here is a link TSE sent me with voltages to check on the Vim.
See attachment
The other problem your showing with the lines is most likely the DPB chip U7. there is a thread on AVS about that with the same pics.
Athanasios
Attached is an improved version of notes on the Marquee circuit that shuts down the video, HV, and G2 when there is an abnormal condition. If something is shutting down and these shutdown signals are normal that would indicate perhaps a problem with the HV or LVPS. The shutdown problems could be happenning because one or more of these signals are telling the HVPS or neck cards to shutdown. Electrohome could have made things alot easier with a couple of LEDs that indicated problems but didn't happen.
Scott
MarqueeShutdownCircuits.GIF
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22.81 KB
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Joined: 08 Mar 2006 Posts: 18063 Location: Langley, BC
Link Posted: Fri Jul 03, 2009 8:29 pm Post subject:
It really comes down to swapping the HVPS. You might have internal arcing which can cause exactly what you are seeing. I've seen that here a few times before. I've got good stock of HVPS.
Joined: 12 Jan 2007 Posts: 12848 Location: West Seneca NY
TV/Projector: Marquee 8000, 8500 And a 9500LC RetroIV , 2 Longbow 8500 Ultras(2004!!)Hd145's , Ampro 3600, a G90!!
Link Posted: Fri Jul 03, 2009 8:33 pm Post subject:
Mike mention's the LVPS can have issues if there is lots of capacitance added to the boards. Steve, I know you have done extensive addition of filtering to every board on your Marquee, do you think the LVPS has finally had enough? I think for the types of mods we want to do we need a more robust LVPS.
Scott, i do like your idea of leds on the Vim in the Spotkill and HV shut down section, this could be a fun project
Athanasios _________________ Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"The government can't control the economy without controlling the people" RR
One Smart Dog!!! Tom Bauerle to Andre Cuomo" Elliot Spitzer Screwed some Prostitutes, you screwed the Constitution" On his call to Cuomo to Resign!!!
Link Posted: Sat Jul 04, 2009 6:59 am Post subject:
Thanks to you all,
I have another HVPS being shipped to me so I will try that when it arrives, Thanks Curt for the offer.
The replacement one was my spare, tested OK 2 years ago, and has been shelved till now. Oh Well.
The LVPS has been replaced by an unmodified one, so this is not the problem.
In my last post, I stated which boards had been put back to OEM unmodified. So this is nothing to do with modifications.
Thanks Scott for the drawing, I will do some testing later today to see what the voltages are at each test point.
Link Posted: Sat Jul 04, 2009 1:08 pm Post subject:
wow !! this is sooo interesting 4me!!!! I am not sure why do I work for the auto industry.... I want to know the end of this thread, to know more.... and more.. and more..... never before a mechanical guy put so much attention to a circuit board thread before.... I guess.... _________________ -Sony CRT VPH 1251Q
- Extron DVS 150 Digital Video Scaler
-KDS X-Blaster Composite to VGA Transponder
-Pioneer CX-4000 Sound System
-Xbox
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-Fortec Star satellite Receiver w/True Free 2 Air
-APEX Digital HD TV Module Converter
Link Posted: Sun Jul 05, 2009 8:35 am Post subject:
Some more info for you all,
Did some testing this morning, and found the following,
R-over I = -0.537v Normal value < 2.5v
G-over I = -0.536v Normal value < 2.5v
B-over I = -0.031v Normal value < 2.5v
Scan fail = 0.122v Normal value < 0.5v
Band switch = 0.035v Normal value < 0.5v
EHT inhibit = 0.028v Normal value < 0.5v
Spotkill = 0.320v Normal value < 0.5v
G2 inhibit = 0.015v Normal value < 0.5v
So from this the Blue VNB looks like the problem, Scott do you agree??
Not sure why I got negative values for the R, G, B-over I. ???
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Joined: 15 Jul 2006
Joined: 12 Sep 2006
Link
, I have my first real problem.
the have been tubes shut down, No HV.
