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Commodore Monitor 1084S-P Repair

Commodore 1084S-P Repair

Commodore Monitor 1084S-P Repair.

Defect:

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

Repair:

  • 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.

Note:

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

Gallery:

Download: Commodore Monitor 1084S-P Schematics (1133)

  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

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

  3. Diego Arevalo
    September 7th, 2019 at 01:28 | #3

    Hello, my name is Diego Arévalo and I am writing to you from Argentina. Nice to see you. I would like to ask you a question. I bought a commodores monitor 1084 S-P, which is missing the flyback. Is the flyback AT2079 / 30102 (equivalent to FLyback HR 7506) the right flyback for this monitor? Would the HR 7506 flyback work well on this monitor? I have a doubt if this is the right replacement. I appreciate a help in this regard. I’m afraid to make a mistake of a flyback model and burn the monitor. Best regards

  4. Vincenzo
    January 2nd, 2020 at 19:00 | #4

    Ciao, ho un 1084s con lo stesso idendico sintomo. Dove è possibile acquistare il suddetto trasformatore di riga?

    Grazie!

  5. Daniele Redivo
    May 15th, 2020 at 18:07 | #5

    hi,
    yes, hr7506 seems the correct equivalent: http://www.hrdiemen.com/reparation/flyback/model/7506
    regards,
    Daniele

  6. July 6th, 2021 at 18:59 | #6

    Hi,
    Ive a 1084s-P1 monitor with the issues described in this post. Ive bought a HR7506 equivalent, but ive noticed that it has a extra pin.

    Do you have a scheme of some sort? or can you point which pin ive to cut?

    Thanks,

  7. July 10th, 2021 at 18:43 | #7

    @Retromania.pt

    Hi the 1084S-P1 (P1) use a different flyback : HR7533

    source here: https://gona.mactar.hu/Commodore/monitor/Commodore_monitors_by_model_number.html

  8. Emanuele
    December 6th, 2023 at 15:52 | #8

    Salve, il mio 1084s-D1 ha fatto un rumore “tipo fritto” mentre scorreva o delle righe, a computer spento. Sulla scheda e sul flyback non vedo tracce di bruciato o altro, non c’era fumo ma si sentiva odore di qualcosa. Qualche indizio?

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