Gravitar problem

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WG 6100 - monitor went out about a few weeks ago - noticed that r100 had burnt up. Got a kit from Bob R. and and i replaced the LV section ... game worked great! but.. then.. r100 went again.. I did not replace the HV section.. any ideas why r100 is burning up? All chasis transistors are good - game plays - but the resistor is getting torched. Ideas?
 
I'd try unplugging P100 and check those two transistors for shorts.

Could Q100 be shorted? I haven't looked to see what parts are removed/unused after installing the Low Voltage kit.
 
hmm.. the game plays but the resistor is getting torched. This happened to begin with.. Checked chasis transistors and they are fine... Not really sure where to check next.
 
The LV section of these is a fail point of the board. You don't usually see it happen often on Gravitar (much more common on Tempest) but it can still happen.

You can replace the LV section with an LV6100 or LV2000 upgrade. Unless you have a more severe issue, that should take care of your problem...
 
BTW - if you got an HV section kit from Bob, too, go ahead and replace it while you're waiting...
 
Installed the LV2000 on this last night and worked perfectly. Gravitar LIVES AGAIN!
 
And now Gravitar has died once again. I finally pulled the HV cage and rebuilt the board with Bob's kit. I'm assuming that a capacitor that spins around and rattles is bad? I'm hoping that was the issue. There was also an open resistor. Anyways - LV2000 now does not read proper voltages (it is only plugged into the harness) - I believe I should be getting -26 and +26 volts. I will assume that it was fried when the game died. It is on its way back to Jeff and he his going to give me another one. The chasis mounted transistors all read properly and were not grounded... so I play the waiting game again.
 
What does "it is only plugged into the harness" mean? You won't get proper voltage if the entire thing isn't connected (HV cage, deflection board, transistors on the frame, etc).

And I believe I mentioned rebuilding the HV section while you were waiting for the LV2000 to arrive...
 
You did mention that... and I did not do that. Plugged in to the harness means testing the LV2000 for + and - 26 volts at pin 2 and pin 5 (off the top of my head) while plugged only in to the harness.

I have now rebuilt the hv section and the LV2000 had a bad solder joint and is now showing the proper voltage.

Going to put everything back together tonight, get a fire extinguisher, cross my fingers and power it up.
 
Alright. It works. Not only does it work, but the screen looks friggin awesome. I thought it looked really looked good before it went out, but I guess I was just used to the screen. Looks very sharp now. Crossing my fingers.. Thanks for your help.
 
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