CurtPalme.com Home Theater Forum

HK-Steve

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 Laughing

, 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 Crying or Very sad

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.

Appreciate any help/advice.

Much Appreciated
Cheers
Steve

HK-Steve · 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??

Cheers
Steve

mp20748 · Posted: Fri Jul 03, 2009 9:27 am Post subject:

1031 · Joined: 22 Mar 2006 Posts: 657 Location: Finland

HK-Steve · 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.

Grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr Crying or Very sad

I really hope this is not my CLM again, the last one had the issue of the horizontal sync lines,

Suggestions??

Cheers
Steve

mp20748 · Posted: Fri Jul 03, 2009 10:29 am Post subject:

disconnect the multi-pin connector to each neck board one at a time...

HK-Steve · Posted: Fri Jul 03, 2009 10:53 am Post subject:

Thanks Mike,
But, still does it with one VNB disconnected.
Started with Red disconnected, reconnected, then Green etc.

Also changed to another VIM which I repaired before installing, but still same problem.

The HDM is only board which has not been changed, think that it is the HDM??

Hmmmm, This is a good one Thumbs Up

Cheers
Steve

mp20748 · Posted: Fri Jul 03, 2009 11:10 am Post subject:

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

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

Tom.W · Joined: 09 Mar 2006 Posts: 6635

" Sorry but you are not authorized to view or download this Attachment " ??? Shocked

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

HK-Steve · 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) Wink

Appreciate all the advice so far, anything else??

Cheers
Steve

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

**Curt Palme** · 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.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

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 Wink

Athanasios

tse · Joined: 03 May 2006 Posts: 1014 Location: Sweatbucket, Fl.

The diagnostic LED on the LVPS will turn on if the power supply shuts down from having too much capacitance on a rail.

Scott

HK-Steve · 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.

Appreciate the comments and advice.

Cheers
Steve

tvless · Joined: 20 Jun 2009 Posts: 76 Location: Ontario

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....

**AnalogRocks** · Posted: Sat Jul 04, 2009 4:03 pm Post subject:

I sugest reading all the back post's on the main CRT forum. I did. It took 3.5 years however Laughing

HK-Steve · 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. ???

More to come. Off with more covers on the 9500.

Cheers
Steve