Game Gear Power Board voltage readings

Discussion in 'Repair, Restoration, Conservation and Preservation' started by malcolm, Jul 2, 2018.

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  1. malcolm

    malcolm Rising Member

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    Hello all,

    maybe an odd one, however i have a few sega game gear power boards 1991 171-6102A that do not have the correct output voltages

    i have replaced all the electrolytic capacitors with new ones. didn't work, then changed the capacitors from a known working power supply same result. changed inductor at L1 and L2 with known working ones.

    voltage readings
    pin 1 and 2: 0.5v
    pin 6: 0v
    pin 7: 8.2v
    pin 9: 0.2v


    has anyone come across a similar issue? could it be MB3775
     
    malcolm, Jul 2, 2018 Report
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  2. takeshi385

    takeshi385 Mojarra Frita Bandit

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    Could be that. It could even be traces running to it. Poke around with an ohms meter.
     
    takeshi385, Jul 3, 2018 Report
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  3. segasonicfan

    segasonicfan Robust Member

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    segasonicfan, Jul 16, 2018 Report
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    Taijigamer2 and takeshi385 like this.
  4. takeshi385

    takeshi385 Mojarra Frita Bandit

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    Dude, I’m glad someone designed a replacement for the game gear power board. I have replaced all the caps in fifteen or so game gears. Three of those fifteen had such horrible board rot from the leaky caps that it was almost not worth saving.
     
    takeshi385, Jul 17, 2018 Report
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  5. malcolm

    malcolm Rising Member

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    Thanks everyone. That is awesome you designed a replacement

    Do you have a link to your past, current, future projects? So good people actively are finding solutions to keeping retro gaming alive.
     
    malcolm, Jul 18, 2018 Report
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  6. Taijigamer2

    Taijigamer2 Gutsy Member

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    Great work!
     
    Taijigamer2, Jul 19, 2018 Report
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  7. segasonicfan

    segasonicfan Robust Member

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    It's good to see people caring about the old Sega Game Gear :)

    My website is the best place to stay updated about my projects:
    https://segasonicfan.wixsite.com/retro

    I have a fancy video encoder/overclocking PCB I'm designing right now, among other things.

    -Segasonicfan
     
    segasonicfan, Jul 20, 2018 Report
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  8. malcolm

    malcolm Rising Member

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    Hello,

    Just reporting that replacing MB3775 did fix the fault with my game gear board.

    had two boards with the same issues, and in both cases replacing MB3775 fixed the voltages.
     
    Last edited: Aug 17, 2018
    malcolm, Aug 17, 2018 Report
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