SNES pal no feed, SNSP-CPU-01

Discussion in 'Repair, Restoration, Conservation and Preservation' started by oxas, Jun 11, 2016.

  1. oxas

    oxas Newly Registered

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    I have been working on a broken snes i got for a few days now. The problem is that it is not giving ANY feed to my television(no signal). I have tried multiple cables and televisions. Still no feed.
    Started to look around on youtube and changed all the capacitors, still no feed.
    Changed voltage regulator and the fuse but nothing seems to work...

    The board its self looks good to me and it powers up, but i cant see anything wrong.

    Hope any of you guys maybe have an idea what might be wrong, and possible how to check/fix it.

    EDIT 1: I have clean every thing, and also tested with working pin connector from a working snes.
    And also, I have searched far and wide, but cannot find anyone with a similar problem
    EDIT 2: I have also removed the reset button in hope this could be the problem(if i dont need to do anything else than remove it, this didnt work either).
    image1.JPG image2.JPG
     

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    Last edited: Jun 11, 2016
  2. bond.san

    bond.san Active Member

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    I have the same model ( SNSP-CPU-01 ) with no screen and sound - will first check the ( voltage regulator ) AN7805 output voltage ( need to get schematic to make sure i probe the correct leg ).
    http://console5.com/wiki/SNES
    AN7805 was Matsushita Electronics Corp upload_2016-6-13_21-2-31.png now owned by Panisonic
    http://pdf1.alldatasheet.com/datasheet-pdf/view/111545/PANASONIC/AN7805.html

    http://assemblergames.com/l/threads...ith-black-screen-problem-trying-to-fix.56488/
    The outcome of the above thread is that the "S-CPU A" stops working after so many years ?!

    Anyone want to donate a working CPU please :)

    Edit:
    Using official PSU - NES-002EU (GBR)

    AN7805 upload_2016-6-13_21-5-45.png
    - Input + Ground probed - voltage no PSU ( residule power ) = 0.55v
    - Input + Ground probed - voltage with power on = 12.65v
    - Ground + Ouput probed - voltage with power on = 4.96v

    My SNSP-CPU-01 was a gift from a friend, if I recall correctly the fuse imediatly blew when first powering on. Pico fuse replaced with 1.5A fuse wire. With further reading I need to inspect the board, discrete components and IC's.
     
    Last edited: Jun 13, 2016
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