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wingscowboy
Joined: 17 Oct 2010
Posts: 2
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| Posted: Sun Oct 17, 2010 3:03 am Post subject: Bad color on my Electrohome 9500LC |
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I have an Electrohome Marquee 9500 LC projector and the color is off all of a sudden. I have tried the standard adjustments with no effect. The blue tube appears not to be as bright as the red and green. This is consistent with the colors that are off on the picture. I haven’t had any problems with focus or power or anything else with the projector. I have searched and read through the forums and didn’t see anything that addressed my issue. I am sure this is a pretty standard issue and has only a few causes. I however am a novice when it comes to CRT projectors. I really enjoy mine and would like to fix the problem. Does anyone have any ideas or advice that could help me?
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Artinaz
Joined: 15 Jun 2009
Posts: 110
Location: SF Bay Area
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| Posted: Sun Oct 17, 2010 3:48 am Post subject: |
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How does the internal white test pattern look ? if that looks ok, then its external to the projector or in the signal path. If that doesnt look ok, then its the tube or the white balance setting.
That will be a good place to start.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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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 Oct 17, 2010 12:50 pm Post subject: |
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It could also be the Glycol having "yellowed". Some of the glycol will cook or react with something and turn a yellow or brownish color in the chamber.
Same cure as fungus. Remove the bellow, wash the chamber, bellow and c-element , put in fresh Glycol.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sun Oct 17, 2010 3:10 pm Post subject: |
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Hello
Try resetting your gray scale, a tube arc may have thrown off your G2 settings: http://www.etechvideo.com/techtip1.htm
Do check your filament voltage also as described in this Tech Tip.
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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 Oct 17, 2010 3:14 pm Post subject: |
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Guys, you missed the 'all of a sudden' part. Fungus won't do that overnight, but a bad power supply will, bad CLM, bad neckboard, bad VIM...
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Oct 17, 2010 3:42 pm Post subject: |
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blue is never as bright.
go to util-9(service) 0901 enter color adjustment and see if the stairstep pattern is way of for all colors or just 1 color.
if all 3 colors are of then maybe its the hvps. if its only 1 color the i suspect a bad vnb.
swap neckboards to confirm if 1 color is off.
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1 answer always poses multiple questions.
marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sun Oct 17, 2010 6:58 pm Post subject: |
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Curt's right, I think reading the post more carefully will yield better advice. I bet 5 bucks the tube died from P14 over-voltage. Ramping up G2 in the color temperature Service menu will quickly reveal this. Probably better place to start than swapping stuff around and wiggling wires. 
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Sun Oct 17, 2010 7:00 pm Post subject: |
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| draganm wrote: | | Curt's right, I think reading the post more carefully will yield better advice. I bet 5 bucks the tube died from P14 over-voltage. Ramping up G2 in the color temperature Service menu will quickly reveal this. Probably better place to start than swapping stuff around and wiggling wires. |
I was thinking the same thing when I read this thread. That or a neck board..
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sun Oct 17, 2010 7:05 pm Post subject: |
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Hello
I have a superminty Marquee blue tube if that proves to be the problem.
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wingscowboy
Joined: 17 Oct 2010
Posts: 2
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| Posted: Tue Oct 19, 2010 12:52 am Post subject: |
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Thank you all for the advice. I will check it all out and let you know what I find.
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haireez
Joined: 14 Jun 2007
Posts: 207
Location: singapore
TV/Projector: Vidikron Vision 1 - Ultra
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| Posted: Wed Nov 24, 2010 11:22 am Post subject: |
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It seems that I'm having the same issue with my green tube. The picture seems to be reddish due to the green output very dim.
However, I try to 'ON' the projector again today and now found another issue. All tube brightness is the same but when i to adjust the contrast or brightness using the 'up' button, the picture seems to be super bright intermittently.
Can you tell me whether you have solve this issue so that I can troubleshoot at my end
Any advise will be greatly appreciated
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JustGreg
Joined: 07 Mar 2006
Posts: 3098
Location: Kenosha, WI
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| Posted: Wed Nov 24, 2010 11:55 am Post subject: |
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| haireez wrote: | It seems that I'm having the same issue with my green tube. The picture seems to be reddish due to the green output very dim.
However, I try to 'ON' the projector again today and now found another issue. All tube brightness is the same but when i to adjust the contrast or brightness using the 'up' button, the picture seems to be super bright intermittently.
Can you tell me whether you have solve this issue so that I can troubleshoot at my end
Any advise will be greatly appreciated |
haireez...I'd start another thread just for your issue. Super bright is never a good thing.
Your problems aren't adjustment related at all. Intermittent super bright followed by dark with a slow return of the image sounds to me like a failed HV protect feature of the HVPS but I'd go ahead and start another thread dedicated to your problem so the real pro's can help. Mixing your issue in with another thread that 'is close' to your problem could lead you down the wrong path.
While waiting for a reply to your own thread, perform the usual board level maintenance; eg, with a PROPER tool, remove the chips from all the boards and clean the sockets and pins with dentaured alcohol. Remove and replace the chips ONE AT A TIME, and pay attention to the way the chip came out. If you have to use a lot of force to reinstall a chip then chances are you have it oriented wrong. Look for burned components and/or circuit traces on the boards while you have them out.
Clean all the card 'blade' connectors with denatured alcohol too. Don't forget the LVPS and HVPS. (Assuming you're talking about a Marquee projector...you didn't say...which is why you need to start your own thread).
Let everything dry well before powering up the projector. When you do power it up turn the contrast and brightness down to ~25 while troubleshooting.
If the tubes are still going super bright after cleaning and reseating the chips and you didnt' see anything burned..STOP playing with it and start looking for known good power supplies to swap in it. The neckboards have overvoltage protection but if all three tubes are going supernova at the same time I doubt they all failed at once, and the problem is probably in one of the power supplies.
I think I speak for everyone when I say, in the thread you start make sure you give us all the information you can...the make and model and manufacture date of the projector, everything you've done to try and fix it, everything that's been done to it to 'mod' it, and keep good notes of everything you try.
And...only try one thing at a time and retest! Don't do 10 things and then try to figure out why it worked; or why it's suddenly worse. Nobody can help you if you aren't methodical in your approach to troubleshooting it and post all the things you've done.
Good luck! (If you weren't so far away I'd say it's hopeless and you need to send it to me and buy a new one) 
_________________
Greg
"Is it ignorance or apathy? Hey, I don't know and I don't care!" --Jimmy Buffett
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skypuppy
Joined: 20 Sep 2007
Posts: 61
Location: Alabama, USA
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| Posted: Sat Nov 27, 2010 3:34 pm Post subject: |
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Wings, your problem could be as simple as a connector cable supplying video to the pj being broken or just shaken a little bit loose, esp if you're using RGB wires to connect into it. If the external connectors got bumped, you might have a fractured lead where the bnc connects on the board. It it were me, I'd check all the simple things first. The same thing could have happened to the source machine as well. Check the whole supply chain cables and connectors.
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What mankind needs is a manned mission to Mars.
Born free. Legislated to death.
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sat Nov 27, 2010 3:51 pm Post subject: |
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Guys!
High filament voltage can ruin a tube virtually overnight, so measure the filament across P14 for starters.
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Zolzar
Joined: 26 Jun 2009
Posts: 252
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| Posted: Sat Nov 27, 2010 8:50 pm Post subject: |
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I second Tim's thoughts. My blue tube died almost overnight due to a high filament voltage. One day all was well and the next I had low output. I fixed the LVPS and then replaced the blue and red tubes. I also used the down time to do the VNB mods as well as HVPS. Definitely check the filament voltage though.....it is critical.
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