CurtPalme.com Home Theater Forum

Arthur · Joined: 14 Jun 2010 Posts: 5

Recently developed a problem with Electrohome Projector Marquee Ultra 9500LC where the Blue gun will not totally turn off when projector is placed in standby. Is this a sign that the blue gun is going? Thanks for any help.

JustGreg · Joined: 07 Mar 2006 Posts: 3098 Location: Kenosha, WI

Hi Arthur,

Safety first! Only do the following if you have the experience. Make sure the projector is off and unplugged first.

I don't know your skill level but if you know how to get at the neckboards swap the blue neckboard with another tube. Any one will do. If the problem follows then the neckboard for the blue tube is bad.

Arthur · Joined: 14 Jun 2010 Posts: 5

Greg,
Thanks for the response but I've already tried swapping the neck board, problem stays with the tube.

Art

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

How does the image look while its on? does it seem like there is too much blue? And does the blue eventually shut of or fade after a few minutes?

nashou

Arthur · Joined: 14 Jun 2010 Posts: 5

Nashou,
The image looks perfect, blue is fine. I have had this projector 4 years. The only problem is, is that now the blue gun will not shut totally off in standby. It had always done so in the past. Blue G2 or blue brightness settings are fine. The whole picture is fine just cannot get the blue
gun to turn completely off when put in standby.

**Curt Palme** · Posted: Mon Jun 14, 2010 9:53 pm Post subject:

If you see a lot of flickering when looking at that dimly lit background, then yes, it's contamination of the tube. The problem might go away after some hours of viewing.

Arthur · Joined: 14 Jun 2010 Posts: 5

There is no flickering whatsoever. Just the blue crt gun will not go completely off in standby mode. It dims to about 80 %
of it's intensity but 20% is still visible.

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

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4409 Location: Phoenix

Hello

Try running blue G2 down to zero, then put in Standby. Any difference?

.

Arthur · Joined: 14 Jun 2010 Posts: 5

Athanasios,
Will do some more checking tomorrow, thanks for the suggestion.

Tim,
Setting Blue G2 to 0 still does not make a difference.

Thanks
Art

JustGreg · Joined: 07 Mar 2006 Posts: 3098 Location: Kenosha, WI

IIRC (from a 3 year old AVS thread) you can connect the blue G2 wire to the green tube... but you'd have to make sure you disconected the HV wire from the green at the splitter block. I may be wrong on this so wait for Nashou or Scott (tse) to confirm this.... or shoot me down in flames. Mr. Green

To be absolutely safe you could bite the bullet and physically swap the blue and green tube locations. Shocked

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

You have swapped the neck card with the green and have the same symptoms. Setting G-2 to zero and the tube is still producing light. If you disconnect P14 and the tube is still lit up it would definately indicate secondary emissions on the CRT. If that is what it is there is a good chance that it can be fixed with a CRT rejuvenator. Many times a Sencore 7000 will cure that problem.

Scott

dvh99 · Joined: 25 Dec 2009 Posts: 2158 Location: nederland

take the tube to xanadu (somewhere in the himalayas they say) and rejuvenate the sucker.
scott i dont know what a sencore is but cant he connect it to a pc and let it show a full white on off screen (1sec white 1 sec black).