CurtPalme.com Home Theater Forum

haireez

Hi,

I just managed to put up my Vision 1 on the ceiling awhile ago. Picture look stunning as compared to my G70. However, there was an annoying continuous sound coming from the center of the projector which I'm not too sure where it come from. It look like it's coming from the HV spiltter but I'm really not too sure what is the problem.

Please refer to my ad in the buy & sell section in this link: https://www.curtpalme.com/forum_archived/viewtopic.php@t=23758.html

Any help will be greatly appreciated!

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

Hello

If it is a medium-pitch buzz, then the power supply wire harnesses have drooped down into the belly fans. Way to test is disable high voltage (unplug any scan yoke) and listen for the noise.

.

haireez · Posted: Tue Oct 12, 2010 5:51 pm Post subject:

Hi,
I'm not too sure how to do as per your advise.
Can you explain in more detail. I've open up the cover and the sound really coming from either HV splitter or around the green tube area.

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

Hello

Unplug a horizontal scan yoke, this will disable high voltage. Restart the projector and listen for the noise.

haireez · Posted: Wed Oct 13, 2010 2:34 pm Post subject:

Hi Tim,

You're absolutely right. After pulling out those plug, the high pitch noise was no more there. After I put back the connector, the sound start buzzing again.

Please advise as what need to be repair or change in order to solve this problem.

Thanks for the help.

the_maniac · Joined: 10 Jul 2009 Posts: 111 Location: Austria - Europe

i've a simmilar problem but it isn't away when i unplug one focus yoke.

i've recorded it, can anyone say what causes this noise ? (it's an mp3 file)

**Curt Palme** · Posted: Wed Oct 13, 2010 3:05 pm Post subject:

Haireez- pulling the yoke plug will disable the HV and the H yoke section. By the sound of Maniac's clip, you have one of the deflection yokes that is buzzing, so you'd need to change that. I have spare deflection yokes if you need them.

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

haireez · Posted: Wed Oct 13, 2010 3:17 pm Post subject:

Hi Curt,

I pulled the Red yoke and start the machine and there's no buzz sound. I 'off' the machine and put the red connector back and pull out the green yoke. There no buzzing sound and repeat the same step for blue.

Therefore, how do I know which yoke is bad?

**Curt Palme** · Posted: Wed Oct 13, 2010 3:24 pm Post subject:

You don't. When you pull any of those connectors, you shut down the whole HV section and H section of all three tubes.. I would put a straw or a tube of paper in your ear, and hunt with the straw where the sound is coming from. Seriously, that's the only way to do it..

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

If it sounds like Maniacs then I think it might be the VDM buzzing.

this is good way to find it better. Get a rubber hose, about 1/2 inch diameter 2 foot legnth and find a funnel that will fit to the hose.
then put the end with no funnel to your ear and the funnel end around the set to find the buzzing , open the rear heat sing and listen around there. it could be that as the sound inside the set bounces around. if ti is the capacitors on the VDM you can hot glue or silicone them together.

Athanasios

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

tim suggested to apply hot glue on the electrolytics near the output transistors of the vdm (9 in total next to each other in groups of 3).
first make sure it is coming from the vdm, keep your ear next to those elec capacitors.

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

oops nash told you the same thing.

the_maniac · Joined: 10 Jul 2009 Posts: 111 Location: Austria - Europe

ok i've pulled the deflection v yoke connectors on the VDM and the buzzing is gone. It also sounds like it comes from the VDM and not the yokes.

can it really be caused by the electrolytics ?

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

yes i have the same problem, it seems to be common on marquees.

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

Funny thing dennis on my 5 Marquees that work none have that issue? I wonder if it happens more with European units due to the 50hz frequency AC voltage?

Athanasios

haireez · Posted: Wed Oct 13, 2010 5:29 pm Post subject:

Hi Curt,

I'm pretty sure that the sound is coming from the green tube. However the sound is more like a loud crackling sound. Even if you put the cover back, the sound can still be heard. Please advise if the deflection yoke is the culprit.

Last but not least, why is it that after I have completed the convergence and made adjustment to the parameters, it seems like the memory is gone once I turn it 'ON' again?

DGP · Joined: 05 Nov 2008 Posts: 57 Location: Barcelona

I also have the buzzing sound coming from the VDM in both projectors. Something I noticed is that the buzzing is louder if I use the VNB’s modified by Mike Parker (specially during start up).

220v 50hz AC - Barcelona Cool

the_maniac · Joined: 10 Jul 2009 Posts: 111 Location: Austria - Europe

my question is what can cause this buzz, never thought that a capacitor can buzz ^^

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