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820-4924 16.5V on PPBUS

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  • 820-4924 16.5V on PPBUS

    I have an 820-4924 that had an absolutely mangled U7100 area. I replaced everything and had to run wires for both R7151/R7152 and R7121/R7122. I've measured all the components and have continuity throughout, but it's still at 16.5V. R7151/R7152 is connected to R7150 and pins 17 and 18. And R7121/R7122 is connected to R7120 and to pins 27 and 28. So my question is, what is the most likely reason that I would still be getting high voltage like that?

  • #2
    Usually shorted high-side MOSFET from Q7130; change it.

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    • #3
      Q7130 is shorted. Replace the ISL, Q7130/5 and Q7155 all at the same time.

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      • #4
        Of course, thanks, that got me there. It's working now. Much appreciated.

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