Space Invaders - Smoke from Monitor Resistor

ArcadeTechGW

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Donor 5 years: 2012, 2022-2025
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Hi,

I'm in the process of refurbishing a Midway Space Invaders. The power supply is solid, but I think the main boards are in trouble. I was testing the power supply, when I noticed smoke coming from a ceramic resistor on the monitor board. I dumped the power.

What I had: Neck glow, but since I was checking the power supply, I wasn't looking to see if I had a picture or not.
Loud humming when the unit was on, while I was checking the power supply.

The resistor that was smoking is under the flyback in the photo, next to the green capacitor. It is the white resistor, it looked to be around 3/4" long by 3/8 x 3/8" square.

Does anyone have any idea what in the heck would cause this? I'm suspecting due to it's proximity to the flyback, that I need to replace the flyback AND the resistor.

What makes this tough is that the monitor has no information, other than a Caution High Voltage sticker, on the lower right corner of the chassis.
 
Last edited:
Good news, bad news

Well, I finally bit the bullet, made a monitor discharge tool, and tried to discharge the monitor.

I got nothing. No spark, no pop.

So, I disconnected the anode, and after noting the connections on the upper yoke, the yoke wires, and pulled the chassis.

I found the brass wire that goes through the flyback to the board broken in two. I am suspecting the flyback is history. The horizontal height pot is busted, and the previously mentioned resistor is roasted at this point, so I'm sending the chassis into a monitor shop for work. It's a Motorola by the way. I also pulled the main boards, and will send them (sans the tent pieces) to one of the shops that does Space Invaders, and get this project hopefully closed out.

Oy.
 
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