CurtPalme.com Home Theater Forum

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

Here is some info i found on an audio forum

Capacitors crate nose because of 3 reasons and 3 reasons only. If the sales people who sell your caps tell you otherwise then fire them and find another supplier.

1) If a cap has to high ESR then drop on this ESR develops Johnson Noise. The Johnson’s is the restive noise not capacitive nose. However, if the cap has such a huge ESR that a part of the cap begin to act as indictors then it is an absolutely garbage capacitor. The only caps that I have seen do it were the caps from old Telefunken radio of 1930 and they had no capacitance and huge none-linearity

2) The dialectic of a cap can exhibit the piezoelectric effect when the electrons in dialectic are exerted under AC in the film. This effect might create some HF noise and the caps do produce some noise at the frequency they roll of AC. But in your case the caps do not have very minor HF noise but the have 60Hz buzz. (Reportedly and admiringly, as my unit has none of it). In order a cap to have piezo-effect 60Hz buzz the cap shall be huge, I mean it shall be a size of 50-100 PP2000 units combined – it will be the size of a good room.

3) A capacitor is fatly and VERY loosely wondered. In this case if the conductors have a LOT of room and very bad quality then they might vibrate. The 60Hz buzz is a vibration, a vibration is mass per amplitude. Circulate the mass of the cap’s film and you know the frequency – you will have an idea how much the film is moving in the cap – it will be huge if you have 60Hz buzz. With this exertion of the file INSIDE the cap the cap is faulty and need to be replaced with another tight wounded.

Athanasios

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

ok so better caps will fix this problem ? has anyone ever fixed it ?

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

Hot glue will fix it too.

I never had an issue with panasonic FC or FM series capacitors. they are a low esr and better cap than the stock ones.

Athanasios

friedwart · Posted: Thu Oct 14, 2010 2:27 pm Post subject:

haireez · Posted: Wed Oct 20, 2010 2:45 pm Post subject:

Guys,

I was doing some testing on the projector and when the movie scene was dark, I found out that the sparking noise actually came from the high voltage cable from the green tube that connect directly to the HV splitter.

During total darkness, I can see sparkling lights emmiting from the cable that caused arching.

There was evident that previous repair technician was trying to use black tape to wrap around at the cable connection in order to prevent arching but was not successful. (Refer to photo attached)

Please help as to how I can prevent arching or spark from this cable.

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

are you sure the cables are secure in the splitter?
it takes some force sometimes to get them in right, you should here them snap into the splitter (not always).
what you could do is take the cable out discharge the copper end on the chassis 2 or 3 times and clean it with alcohol and put it back in firmly.

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

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

In that pic it looks like the HV cable is bent and probably not secured properly to its connector or the connector is broken.

I would remove the tape and look at the HV splitter to make sure its not damaged. you could also leave the Green HV cable out and fire up the PJ to look for any HV leaks out of the spliter casing.

Curt has new HV cables if yours is damaged.

Athanasios

haireez · Posted: Wed Oct 20, 2010 4:50 pm Post subject:

Hi,

Thanks for the feedback. I've removed the tape and did not find any damaged to the splitter or the cable connection.

Somehow after cleaning and securing them in place, I could still see spark (dim light) at the exact location but the noise was not that evident anymore

As advise by Athanasios, the spark & noise was totally gone when I disconnect the green HV cable out and the projector seems perfect for the very first time using blue & red tube.

Please advise as I have actually replace the HV splitter with a spare unit but the problem is still there.

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

I say the Cable needs replacing.

But first clean the cable with Denatured alcohol or as close to 100% alcohol you can find. Clean all the way from the bell housing to the end of the connector. Carbon build up on the cable will carry Electricity.

Athanasios

stefuel · Posted: Thu Oct 21, 2010 10:51 am Post subject:

Cables are cheap. Just replace it and be done with it.

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

haireez · Posted: Thu Oct 21, 2010 4:05 pm Post subject:

Hi,

I've clean the cable as instructed and detach the HV splitter and everything seems alright for about 3 hours of running. (Refer first photo)

After I'm convinced that the cables is OK, I've decided to re-install the HV splitter at the original location and start the machine again. My hapiness shortlive as there was a fire coming out from the same cable again and I immediately 'OFF' the machine to prevent further damaged. Refer to 2nd & 3rd photo.

As I'm still not satisfied, I then detached the HV splitter again and place it at the same exact location as per 1st photo and it works perfectly again.

Please help as I'm at lost right now!

haireez · Posted: Thu Oct 21, 2010 4:06 pm Post subject:

2nd Photo

haireez · Posted: Thu Oct 21, 2010 4:08 pm Post subject:

3rd Photo

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

replace the cable like dragan said, before you damage other things inside the pj, do not run the pj anymore with the arcing.
curt sells the cables.

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

Your lucky no one walked by that hanging Splitter!!!! You Green HV cable is dead! A small pin hole will allow it to arc to anything that will conduct electricity, even a human!!! Replace the Green HV cable right away and do not use the PJ till you do.

Athanasios

draganm · Joined: 08 Mar 2006 Posts: 8990 Location: Colorado

it's simple math really Fire = Bad Laughing

Revox · Joined: 13 Feb 2008 Posts: 158

Ill join, because my marque does this buzz noise as manic too.
But i is not the VDM Board, its the board behind the red tube.
Ill search for it tomorow and will inform you!

haireez · Posted: Sat Jan 22, 2011 1:33 am Post subject:

Hi,

My vision 1 is noise free right now after I replaced 3 new HV lead that I bought from Curt.

I believe this will solve your problem too.