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(Topic ID: 225982)

WPC89 MPU on the bench (reset loop)

By arqpuebla

5 years ago


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  • 31 posts
  • 2 Pinsiders participating
  • Latest reply 5 years ago by Pin_Guy
  • Topic is favorited by 1 Pinsider

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    #2 5 years ago
     
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    Pin_Guy

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    ...

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    #6 5 years ago
     
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    Pin_Guy

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    Good call, If this is the original (grey) capacitor I always replace them before I event test the board. Its a super easy and cheap replacement.

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    #9 5 years ago
     
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    Pin_Guy

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    OP
    Quoted from arqpuebla:

    pin_guy what about a watchdog jumper wire. never did that, or need to do it. That will disable the watchdog.? and let's see what happens

    I've never done that either, but it looks like jumpering pin 1 to 3 will force the low needed to disable it at the ASIC. Are you seeing a low going BLANKING signal coming from U9-35?

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    #11 5 years ago
     
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    Pin_Guy

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    OP
    Quoted from arqpuebla:

    u9/35 ?

    No, I meant 34...are you actually seeing it change states?

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    #14 5 years ago
     
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    Pin_Guy

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    Ok, so you know the resets are coming from the ASIC. Are you seeing any changes out of the low voltage monitor U10?

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    #16 5 years ago
     
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    Pin_Guy

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    Should be able to check it with your logic probe. Low = Reset

    ASIC POR 61 input I assume POR = Power On Reset

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    #20 5 years ago
     
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    Pin_Guy

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    I prefer pictures

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    #22 5 years ago
     
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    Pin_Guy

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    Hmmm....

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    #24 5 years ago
     
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    Pin_Guy

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    Socketed RAM or soldered?

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    #26 5 years ago
     
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    Pin_Guy

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    If it was socketed I would say to reseat it, soldered in not so much.

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    #27 5 years ago
     
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    Pin_Guy

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    If it was bad, you would be seeing RAM errors on the diag LED

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    #29 5 years ago
     
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    Pin_Guy

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    NICE!

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    #31 5 years ago
     
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    Pin_Guy

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    Anytime, had a great time I love a good chin scratcher!

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