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Thread: 1084S-P LOPT+HOT replace

  1. #21
    Inactive Member Jimmybaby's Avatar
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    ok thank you for this, but i have one more question because i ordered a new flyback :

    http://www.ebay.ca/itm/400370481844?...84.m1497.l2648

    This one fit but he have just 8 pins! the #4 is not present, is it important? because the 8 pins are at the good emplacement. It's an AT2079 for "commodore screen" says the box.

  2. #22
    Inactive Member Jimmybaby's Avatar
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    Thank you, i have one more question, i have bought this flyback :

    http://www.ebay.ca/itm/400370481844

    But he only have 8 pins, the #4 is missing, but the 8 pins fit perfectly, is it important? is it a new version?
    i found this infos about the flyback :

    Model P - Boxy - Philips CM8500 - Philips - AT2079 | HR7506 - 1988 - [FBT 483514067024,482214010349,AT2079/30102,AT2079/30101,AT2079/37591,SKFB63342] | Variations

    Thank you guys.

  3. #23
    Inactive Member SquallStrife's Avatar
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    According to the diagram on Donberg's site: http://www.donberg.ie/descript/h/hr_7506.htm



    The pins in positions 4 and 8 are either missing or not connected, so you should be fine.

    Edit: One last thing (as mentioned by rkauer earlier in this thread), after you replace the HOT and flyback, when you power on and apply a signal, the screen will be blank. Don't be alarmed, the flyback comes with the "SCREEN" setting at zero. Slowly adjust the knob on the side of the flyback until you get a picture, and adjust FOCUS if you have to.
    Last edited by SquallStrife; 15th March 2013 at 04:40.
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  4. #24
    Inactive Member Jimmybaby's Avatar
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    Thank you SquallStrife, that's very helpful. I'm waiting for the H.O.T., when i have received it, let's go to soldering!

  5. #25
    Inactive Member Jimmybaby's Avatar
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    Bad news, i changed the flyback and the hot, and i still have the same problem/symptom. Le LED power still stay off, and a whistle comes from (i think) the power supply. I despair.
    I put 2 pictures off the back of the power supply, if someone can give me a little help.





    Uploaded with ImageShack.us

  6. #26
    Inactive Member Jimmybaby's Avatar
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    i have read that if i have a whistling it's because there are a short circuit on the power supply. The fusible(breaker) looks ok.
    I really want to repair this monitor, i don't have a big budget but I am persevering.

    Squallstrife, tell me if you want that i move to another topic

  7. #27
    Inactive Member Jimmybaby's Avatar
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    for information, the problem came from a d1887 transistor and a capacitor 100M.F.160V., I also changed the flyback and H.O.T. Now everything works.

  8. #28
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    @ Jimmybaby

    What are component references screen printed onto the PCB for the D1887 and the 100mf 160V capacitor?

    If you can supply the Q and C number references, then this is useful information for Commodore 1084 as well as Philips 8833 monitor owners.

    Nice work!
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  9. #29
    Inactive Member Jimmybaby's Avatar
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    Quote Originally Posted by Merlin View Post
    @ Jimmybaby

    What are component references screen printed onto the PCB for the D1887 and the 100mf 160V capacitor?

    If you can supply the Q and C number references, then this is useful information for Commodore 1084 as well as Philips 8833 monitor owners.

    Nice work!
    I don't know, because it is a repairman who made this repair. I changed the flyback and H.O.T. myself. Sorry I can not locate precisely.
    The only thing I know is that the power passed without problem until H.O.T, then there was a problem.

  10. #30
    Inactive Member galem3's Avatar
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    Default Commodore 1084S

    Hi all;

    Have the same problem with two 1084S monitor,
    The reference of the BU is BU508AF m8830.

    Found on Ebay, but there are in 5A & 8A
    which is the good on ?
    an what m8830 means ?

    thank you all.

    regards.
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