Huawei nbb-wah9q without 3.3VALW

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  • FranGutierritos
    New Member
    • Apr 2024
    • 3
    • Mexico
    #1

    Huawei nbb-wah9q without 3.3VALW

    Hello everyone. The 3.3V power supply IC is damaged, but I can’t figure out exactly which IC it is. On the board there are three ICs with the same marking (DCUCLU), but they are for the 5V, 1.2V, etc. power rails.
    Does anyone know which IC this is?
    I was considering the TPS51393, but I’m not sure if they are 100% compatible.
    Thanks for your help. Best regards.
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    • mon2
      Badcaps Legend
      • Dec 2019
      • 14316
      • Canada
      #2
      Meter in diode mode. Remove all power. Touch the meter probes together and you should hear a tone beep. Place one meter probe on this missing rail and other probe on the parts you suspect to be the power regulator. Stop when you hear a tone beep. Share the details of what you find. Assuming that the rail is defective and not a shorted part to ground which will force the tone beep when you touch any ground trace. Start with this investigation.

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