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Paso 6
Detach U6990 first. Then run diode mode measurement of D6905 Pin 3 again.  The measured value is 0, which indicates short-circuited condition. We can conclude that the faulty condition has nothing to do with U6990. Yet U6990 might has been damaged as well. Continue to detach C6990. Then run diode mode measurement of D6905 Pin 3 again. The measured value is 593, which is normal.
Troubleshooting
  • Detach U6990 first. Then run diode mode measurement of D6905 Pin 3 again. The measured value is 0, which indicates short-circuited condition.

  • We can conclude that the faulty condition has nothing to do with U6990. Yet U6990 might has been damaged as well.

  • Continue to detach C6990. Then run diode mode measurement of D6905 Pin 3 again. The measured value is 593, which is normal.

  • We can conclude now that the faulty condition is related to C6990.

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