sideburn

Hi Rolo, Are you referring to the 5 wires going to the yoke? I couldn't figure out what pins you are referring to from the schematic. I took readings off the 5 wires going to the yoke and I am reading: Brown wire: +132VDC Black wire: 0VDC Gray wire: 0VDC Blue wire +10.4VDC White wire: +49VDC

I could use some help with repairing mine as well. Mine has no picture/no sound. Right now I am just focusing on trying to get a white dot on the screen.. I have done a cap kit replace on the analog board and I have already bought all the caps for the logic board, as well as new sockets and ICs for the logic board. I've checked the A/C voltage off the transformer and it is reading about 21VAC across the two red wires on the power switch/volume knob. I've checked voltages on the wires going to the CRT yoke and I am reading: Brown wire: 132VDC Black wire: 0VDC Gray wire: 0VDC Blue wire 10.4VDC White wire: 48.9VDC I can see a faint orange glow in the yoke of the crt but nothing on the front. no white dot or anything. I'd love to get mine working as well before I have to just part it out and sell it.. I have scopes, logic probes, multimeters, soldering equipment, and general electronics engineering knowledge but I am clueless about repairing this thing. Anyone willing to help me out??

Its not a wiring problem. It only happens during game play. The test mode always passes fine for all buttons. Sometimes the left rotation sticks, other time the right button fails to turn at all. its very intermittent. Maybe one of the chips that handles the button inputs is going bad. thats all I can think of.

No sound.. nothing. Ive measured voltages ranging form 12v to 50v I haven't checked the board connecting to the neck of the crt yet. Where are you measuring 12VAC?

Hi all, I am hoping someone on here with some experience repair an asteroids PCB can help me troubleshoot a minor issue I am having. My left rotate is sticking intermittently. I have replaced the buttons so I know it is a problem on the logic board but I don't know where to look. Every once in a way the ship gets stuck rotating left and then i can rotate right and it will eventually fix itself during game play. It only crops up once in a while. Any ideas?

It's completely dead. No sound. No picture. So far the voltages I have tested are good. Since the CRT is not even lighting up I figured I don't need to have the logic board connected why troubleshooting the CRT issues. I re-capped the pcb.

Thanks. I have disconnected the logic board for now while I sort out why the monitors not firing up. I do have the tools to repair. Logic probe, multimeter, oscilloscope, etc.

Wow I have almost the exact same scenerio. Pulled my vectrex out of garage after storing forever. Power board looks perfect. But logic board has rusty / corrosion on lots Of pins. But it could be fixable I think if I keep replacing chips and running the logic probe across it. Unless the ROM Itself is bad. BUT.... I have other problems.. Like yours, nothing happens on power up. But my CRT doesn't even glow. But the power cable to the logic board voltages are good. The transformer is putting out 20v. Each brown lead is 10 vots. Probing around the flyback transformer I get 133v readings. I've re-capped both boards. Still nothing. Trying to find out what makes the crt glow and what voltage readings I should see to rule out if my crt is toast or not before I even move on to figuring out what's wrong with the logic board. I've bought a bunch of replacement parts already but I'm starting to fear my CRT is bad.

Can someone please answer me all or even just one of these questions: Should the picture tube be lighting up even if logic board is disconnected? What voltages should I see on back off crt and near the high voltage transformer? If this is not the place for tech help, is there another vectrex forum where I can get some troubleshooting support? Thanks! I am desperate for some help trying to repair my vectrex. The picture tube is dead but I'm seeing voltages that look correct so I'm wondering if the crt itself is bad. I got no replies from my first post so I guess this one will be my last try

No one? To simplify: I need to know if the neck of the crt should light up/glow even if the logic board is disconnected? Can someone with a multimeter give me the voltage readings I should expenct from the pcb that attaches to the back of the crt.

Hello, I have a vectrex that does nothing at all when powered up so I thought I would take a shot at fixing it. The first problem is the CRT is dead so I replaced all of the capacitors on the power pcb but that didn't change anything. Hopefully someone here can answer some questions I have. - with the logic board disconnected but switch powered on, should the back end of the crt be glowing orange? Because it is not. I do see some voltages as high as 130v when I probe areas on the pcb near the flyback transformer and I do get a tiny spark when I discharge the crt. I'd like to know what areas to check for voltages and what it takes to have the crt glow in a normal circumstance. The transformer seems ok, each brown lead going to the pcb is putting out 10v. Thanks for any help!

I'm interested. What kind of condition would you say it is in? Also will you be including the composite video cable? I am located in San Diego.. How much would it cost to ship from where you are?