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Commodore Monitor 1084S-P Repair

Commodore 1084S-P Repair

Commodore Monitor 1084S-P Repair.


  • Completly dead with only a loud whistling noise in background.


  • Replaced the flyback transformer (AT2079/30102) everything has started to work perfectly.
  • It’s mandatory to made a calibration of the SCREEN and FOCUS with the two trimmer placed on the rear side of the flyback transformer.


A loud whistling noise indicates a bad flyback transformer (also known as an LOPT).


Download: Commodore Monitor 1084S-P Schematics (443)

  1. jdr
    April 28th, 2019 at 19:18 | #1

    My 1084S-P that I was lucky to find (great picture, clean) just died yesterday. I’ve only used it less than maybe 3 hours in total since acquiring it and it appeared to not have many hours of use in its lifetime. So clean inside. I had a C64 demo up and running, walked away for approx 10-15 mins and when I returned, I was greeted to a blank screen and no audio. Power LED is still on. I powered it down and let it rest a while. When I powered it back on, there was no static charge. No glow from the CRT. After a short time, I begin to smell an odd odor…not a burning smell and no smoke. Could this be ozone? Not wanting to flood my area with something potentially harmful, I have turned it off and unplugged it for now. Never heard any whining noise, by the way. I suspect it is still flyback related. I hear ozone is produced by high voltages and its presence could mean a leak somewhere.

  2. May 1st, 2019 at 00:08 | #2

    no static charge, you have a good percentage that is the flyback transformer burned, otherwise the damage is a little more serious.