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Vextrex No Sound, Dim Dot


StefanS

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Hi Everyone,

 

New to the forum and Vectrex. I picked up a non-working unit and am trying to bring it back to life. Symptoms are as follows:

  • Hums when turned on (transformer reads about 10V AC)
  • Speaker crackles when volume is adjusted, but no sound
  • VERY faint dot in center of screen when brightness turned all the way up
  • Filament briefly lights when turning on cold (< 1 sec). No light at all when warm start
  • Cable from power board to logic board sending +/-5V and -13V (checked from the logic board, not the connector)
  • All electrolytic caps just replaced (no change in symptoms, as I tested it before) - most of the caps were fine, a couple had high ESR, a couple were out by >20%
  • Filament appears to be getting about 7.5V AV
  • Input to flyback looks like it is getting +/- 11V (should be 9?)
  • Outputs of flyback about half their expected voltages
  • Flyback has no dead shorts (all between 0.5-2.0 Ohms)

 

I have some experience recapping and repairing 80's oscilloscopes, so I'd say I have intermediate skills. Any advice is greatly appreciated!

 

Thanks,

Stefan

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