CurtPalme.com Home Theater Forum

mr_ro_co · Joined: 08 May 2006 Posts: 1643 Location: Santa Fe NM

To ground or not to ground, that is the question... Anyone here an expert on how to address the static fields that exist around high voltage stuff? With CRT projectors, are we supposed to isolate these fields from ground or give them a path?

I'm having an issue with the continuous sound of static crackle on my Marquee. I've tried various locations for the splitter and routings for the HV cables, but to no avail.

Has anyone experienced this problem? It is less pronounced with the cover off the projector, but as soon as I put it back on (which causes the HV cables to brush up against it), crackle city. Very irritating, makes it hard to watch a movie!

Are the HV splitter and cables supposed to touch the chassis or not?

Thanks!

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

Hello

Try to use the nylon cable clips that should be mounted on the tube covers. High humidity might cause that also.

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

I know Tim has already replied but I'm curious about other things. Does your 9500 have the lead shielding flaps? Floor mounted they just lay on the tube covers, HV leads, and splitter. Ceiling mounted they (the lead shielding flaps) hang down on the access cover when it's on; but either way the cables should be underneath them.
I had to re attach the nylon anchors/retainers Tim mentioned as they were loose and all piled together but I never had any crackling (M8500). Interesting.

Thanks for indulging my curiosity. Thumbs Up

Greg

EDIT:BTW, nice avatar

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

The HV should be insulated from the chassis. There shouldn't be any leaks. The only time that you should hear the crackle is when the HV is coming on or going off. Try looking for little sparks inside the projector with the room dark, turn pj contrast down low.

Scott

mr_ro_co · Joined: 08 May 2006 Posts: 1643 Location: Santa Fe NM

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

mr_ro_co · Joined: 08 May 2006 Posts: 1643 Location: Santa Fe NM

Greg - thanks!

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

As TSE said there should be no HV leakage anywhere. The system is designed to not arc unless there is a problem. The high voltage leads can lay right on the chassis and not arc. Most of the shields are for EMF protecting, not HV.So what could cause the arc? A crack in a HV lead, crack in splitter, poor solder joint in HV supply, tube going bad, CRT socket, Horz. output trans. insulator, and on and on and on. What you should do is exactly what TSE said. Take cover off,turn the lights off, fire up the projector, turn contrast down and set there and stare at it until it arc's and see where it's coming from. Also if it is or was in a smoke or bar n grill type enviornment, the build up of nicotine or cooking oil can create a path for the HV to follow and a simple cleaning can cure it. Good Luck !

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

Guys

We have seen tubes made with, and without, PVC clear tube sleeves on the anode lines; perhaps TSE can comment on why they were used sometimes and not all the time?

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

It's my understanding that the tubing on the anode leads are to protect the lead for getting cut on the many sharp edges inside. Why they are not always used? who knows. They should be.

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

There was a time when UL was hot to have the protective sleeving, other times not.

Scott

mhalsan · Joined: 09 Nov 2007 Posts: 146 Location: Astoria, Oregon

Would high humidity cause static problems?

If your building has air conditioning, it can be modified to provide controlled dehumidification.

Mark

Fujifrontier · Joined: 20 Oct 2007 Posts: 354 Location: San Antonio, Texas

My sony does this too, but not a loud "snap," just that little "ticking" every 5-10 minutes, very seldomly... I jsut might take it apart and clean it someday

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

There are a few places more humid than Melbourne, Fl. where Ampros were made, but not alot. There were no static problems unless something was wrong. The HV connections for anode type voltages, 35KV, need to be airtight.

Scott

dturco · Posted: Tue Nov 17, 2009 5:26 pm Post subject:

It's an old thread to prove I searched first. But I have this "crackling sound" too. I also have wavy lines that show up in the displayed image. Herringbone?

I have turn off the lights and removed the covers and do not see any arcs.

I have replaced the HDM.

I have replaced the HV splitter and I even made sure the HV lead goes to the in port.

I have taken the power supplies LVPS & HVPS to MP's test machine and the problem does not display on his rig, also put my neckboards on his machine with my power supplies in it, no problems there either.

I have put electrical tape over all HV leads.

I am running a dedicated 20 amp line with a hubble outlet, fully grounded to a metal box, and in the main power box.

So how can I find this noise problem and arcing? Is there a probe of some sort or something like a violet wand to pick up the arcing or noise?

Or something else to try?

Edit: I am also having an issue with interference from the P/J that cuts off my cell phone if I get within 15 feet of the P/J.

I have removed all of the HV leads from the splitter and just leaving the HV lead attached to the splitter and having put rubber boots over the open holes on the splitter, the phone cuts off.

I have put a shim in the HDM cage to insure clearance of the HDM from the cage.

The interference is keeping the remote from operating when a source signal is applied IE: Blu -ray

Next?

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

Do you have an extra Vim to try out not a modded one? The Phone thing has me wondering if the Vim is creating or receiving HF signals. there are a few circuits on there if altered can cause them to turn into radio receivers.

Also do you have any dimmers in the room or fluorescent lights nearby? if the dimmer is on the same circuit it could cause issues, and i mean the same panel box and ground. keep all audio equipment connected to the same ground plane circuit.

Athanasios

dturco · Posted: Wed Nov 18, 2009 12:02 am Post subject:

No extra VIM. No fluorescent lights. Yes to the dimmer but in a separate sub panel.

All audio is in the separate sub panel and runs through a Furman power conditioner.

Also I have tried running an extension cord from the Furman no change.

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

So I assume your audio connections out of the video sources are not optical and in the same sub panel but the PJ is connected to a different sub panel?

Athanasios

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

Oh one more question where is the input cable from a satellite or cable box grounded to?

Athansios

dturco · Posted: Wed Nov 18, 2009 12:14 am Post subject:

Correct. Audio is analog from pre-pro to Blu-ray, and picture is HDMI direct to the moome card in the P/J.

No satellite or cable is in the loop just Blu-ray and P/J.