Super famicom voltage drop

Discussion in 'Repair, Restoration, Conservation and Preservation' started by billyohgren, Aug 11, 2016.

  1. billyohgren

    billyohgren Member

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    I've been trying to fix two Super Famicom consoles that seems to have the same problem.
    After replacing D1 in both of them I measure 9v up until the power switch when the switch is set to off.
    When I put the switch to on the voltage drop to between 3-4v.

    Here's what I've tried to far to debug this issue:
    - Remove 7805 = measured 9v at the input solder pad.
    - Solder 7805 input and GND leg only = measured 3-4v at the input leg.
    - Solder only 7805 input leg = measured 9v at the input leg
    - Solder 7805 input and output leg = measured 3-4v at the input leg.

    I've also replaced a bunch of capacitors without any luck.

    When I'm diode testing with a multimeter from GND to the components L1 and c11 I'm getting a beep in both ends each component, is that normal or does that indicate a short?

    This mother board haven't been modded in any way.

    Please help me before I'm throwing this out of the window! :p
     
  2. Bad_Ad84

    Bad_Ad84 The Tick

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    Replace the 7805 is my first suggestion
     
  3. billyohgren

    billyohgren Member

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    Oh, I forgot to mention that I've replaced the 7805 with a new one. No luck :(

    I'm getting a new multimeter today cause mine broke the other day (parts fell off, I think I paid like 5 bucks for it) and I'm thinking about reflowing every IC hoping there's a short somewhere.
     

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