Asteroids Deluxe 19v2000

The easiest thing to do is remove them (just do one at a time if you'd like) from the frame or unplug the connectors to the deflection board. Take the black lead of the DMM, place it on the case (collector), then take the red lead and place it on one leg (emitter or base), then place the red on the other leg. Then do the same with the leads reversed. Then place the red on one leg and the black on the other and then do the same but with the leads reversed.

I'm horrible at remembering what the diode readings should be from C to B to E, but these tests should either be open (OL or infinite) or between 0.4 to 0.7. If you have a known working transistor you can compare it to that. But if you see anything below that (usually 0v) or OL/infinite where it should not be, you have a bad transistor.
 
Since the top half of my screen is collapsed then that would be the +Y according to the graph, which would be Q608 and 609 output transistors, neither of which are the one transistor I had messed with.
 
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So I replaced all the transistors and that fixed the collapse.

Unfortunately it did not fix the original problem. Game ran great for about an hour, then started to do what you see in the video, brightness turning down while flickering, until eventually completely dark, with the led lit on the chassis.

At this point I have to assume it's something with the pcb?

 
Damn, thought you had figured this out.... If you want to make the trip inland with it I can at least tell you if it's a monitor or PCB issue and likely fix it if it's the monitor. If AD has the same pinout as Asteroids you can also test the PCB in my machine. Let me know.
 
I know there are people who repair these chassis' and people who repair the boards...but is there anyone I can send both to, since I don't know which is the culprit?
 
Check your 90v b+ voltage coming out of the hv box. I had something very similar I just fixed on a g05 and it ended up being a resistor in the brightness circuit. However my spot killer never came on.
 
Turn the brightness up and see what you see. Smells like monitor caps to me.


what would cause a working v2000 to wave left and right at the top of the screen
like somebody waving a hand ?
only notice it on the top 2 inches with the grid up.
Monitor will run no prob, but that wave....
 
Bumping this thread with an update, as this board was sent to me for repair. And it turns out the solution was kind of interesting, for anyone else who might run across this again in the future.

This deflection board still had the 15W resistors installed at R101 and R100 (which are recommended to be removed, see the b/w vector FAQ). It turns out one of the transistors in the spot killer circuit (Q500, a TPS98) is right next to R101, and on this board Q500 was not bent over, close to the PCB, as they sometimes come, but was sticking straight up, and was being exposed to the heat of R101, basically cooking it.

It was taking about an hour in my setup, but eventually the heat was causing Q500 to fail, and partially kick in the spot killer. I replaced Q500 with an MPSA06 (sub for TPS98), and the problem was fixed.

I also removed R100 and R101, replacing them with pieces of wire, per the FAQ, so this shouldn't happen again.

Fun stuff.
 
Bumping this thread with an update, as this board was sent to me for repair. And it turns out the solution was kind of interesting, for anyone else who might run across this again in the future.

This deflection board still had the 15W resistors installed at R101 and R100 (which are recommended to be removed, see the b/w vector FAQ). It turns out one of the transistors in the spot killer circuit (Q500, a TPS98) is right next to R101, and on this board Q500 was not bent over, close to the PCB, as they sometimes come, but was sticking straight up, and was being exposed to the heat of R101, basically cooking it.

It was taking about an hour in my setup, but eventually the heat was causing Q500 to fail, and partially kick in the spot killer. I replaced Q500 with an MPSA06 (sub for TPS98), and the problem was fixed.

I also removed R100 and R101, replacing them with pieces of wire, per the FAQ, so this shouldn't happen again.

Fun stuff.

Wow, very weird problem. Thanks for the explanation.
 
Bumping this thread with an update, as this board was sent to me for repair. And it turns out the solution was kind of interesting, for anyone else who might run across this again in the future.

This deflection board still had the 15W resistors installed at R101 and R100 (which are recommended to be removed, see the b/w vector FAQ). It turns out one of the transistors in the spot killer circuit (Q500, a TPS98) is right next to R101, and on this board Q500 was not bent over, close to the PCB, as they sometimes come, but was sticking straight up, and was being exposed to the heat of R101, basically cooking it.

It was taking about an hour in my setup, but eventually the heat was causing Q500 to fail, and partially kick in the spot killer. I replaced Q500 with an MPSA06 (sub for TPS98), and the problem was fixed.

I also removed R100 and R101, replacing them with pieces of wire, per the FAQ, so this shouldn't happen again.

Fun stuff.

just saw this. excellent troubleshooting, andy! adding this one to my bag of tricks. thanks!
 
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