Space Invaders monitor issues.

TrevEB

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Wells 19v1000 v1001

This monitor had fade out issues that wire jiggling did not fix.
So I went at it.
The cable coming from the flyback transformer essentially fell apart in my hands.
I'm starting to think its suppose to do that but I don't know.

Is the black "stick" inside the cable an anode?
That part has a tiny metal wire at both ends. One end just snapped off in the wind.
After putting it all back together, it did start up but the screen was a mess.

So, I am looking to replace whatever that black stick is, and or replace the flyback. I cannot find the flyback anywhere.

Help!
TrevEB
 
That "stick" is your HV diode. You need that. If you slide back the rubber boots, you should be able to see the metal ends of the diode, with the wire soldered to it.

The suction cup is probably brittle and crumbled, right? You can easily replace this by sliding back the rubber boot and unsoldering that side of the wire from the HV diode. You can scavenge a nice new suction cup/HV lead off a junked computer monitor or television set. Cut the wire to about the right length, and thread it through the old rubber boot (might have to widen the hole in the boot to accept the thicker wire), solder it back to the diode, and put the rubber boot back.

A replacement flyback for this monitor is going to be hard to find. I believe the HV diodes are available, however. If the rubber boots are bad, then you're going to have to come up with something, it has to be rated for HV insulation. Electrical tape isn't going to cut it.

-Ian
 
The suction cup to the tube is fine.

The entire cable was covered in goo, as others have noted.
I thought this goo came from some cushioning that I think use to be around the monitor between the glass and the black cardboard, both of which had disintegrated over everything below.

The rubber boots? Are you referring to the parts that the HV Diode plugs into?

The Diode itself was not soldered to the spring, nor do I think it should be. It would be a serious challenge to do that.
One spring is soldered to the white wire coming out of the transformer.
The other spring was not soldered to anything. It floats freely inside a metal sheath, which is soldered to the wire that continues on to the tube.
The Diode should make contact with both springs, though currently one side the diode is gone, so contact is probably via lightning forks. Not good.

Varo H1802 HV Diode.
Ok, where do I find one of these or what is a good substitute
 

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OK, yeah, the assembly on that monitor is slightly different then the one I last worked on (a TEC). Looks like they didn't solder directly to the ends of the diode as in the TEC monitor.

The goo is the result of the plasticiser leeching out of the material that the wiring is made of. Brake parts cleaner will remove it, but it's not hurting anything to leave it.

It looks like Bob Roberts is sold out of HV diodes. I believe NTE505 is a substitute, but I'm not sure where to find one. Might have to do some hunting online. There should be several other substitutes for a HV diode. Hmm... I wonder if you could use a 1B3GT somehow... heh.

-Ian
 
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