v2000 slowly dimming

BobsterD

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I did a full recap on a v2000 (in a Asteroids Deluxe) including changing all the pots and the 4 TO3 transistors, but it has been slowly dimming over the last couple of months. I have been making bright & contrast adjustments to offset, but I have now run out of adjustment.

Anyone have any ideas where to start looking on this?
 
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If you can read the schematic, check the monitor plug for the proper 6v heater voltage. Its possible your power brick is having a problem and/or just a dirty plug or fuse. These are sort of strange in that the power brick provides the heater for the monitor.
 
I repaired an Asteroids Deluxe for a friend of mine a couple of months ago which had the exact same problem I changed r100 and r101 game worked great

Andrew
 
I repaired an Asteroids Deluxe for a friend of mine a couple of months ago which had the exact same problem I changed r100 and r101 game worked great

Andrew

Well, no luck there. I removed them and jumped with a heavy guage wire, no change. I'll take a look at the heater voltage next. I do have neck glow for right now... although it starts off quite bright but after a couple of seconds it settles down.

Could a bad or weak HV diode cause these problems?
 
Bad HV diode usually causes monitor to bloom (everything gets bigger, literally!). Neck glow comes right from the power brick so it has nothing to do with HV on the vectors.

The neck should start out bright and settle down like you said, but watch it over the course of it getting dim - if you think the neck gets pretty dim, that could be your problem.

Another possibility is a board or monitor plug issue - the Z signal I think provides the brightness. If the plug has a dirty connection or maybe the board has bad caps or a bad ground that could cause a dim picture.

A bad big blue on the power brick can also cause it, and I'd suspect that before anything!
 
It's definitley in this monitor as I am testing it on a different Asteroids Deluxe, same problem. This cabinet also has a new big blue so it rules that out. Do these tubes see improvement with a rejuv?

I'm past the big stuff so now I'm thinking it's something simple I'm overlooking.
 
Well, the latest. I wanted to focus on the Z circuit and the spotkiller circuit -I replaced -

Q500,501,502,503,504
C500,501,502,503 back to .47uf tantalums (removed the capkit 'lytics)

And, the monitor is brighter, but I wouldn't say super bright. I have 91v going to the Z circuit, so that seems ok. I took out D504 LED per the X-Y faq and tried it, no change, so put it back in. Perhaps with the age, this is the best it will get.

I wonder if a tube rejuv would help this?
 
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