Canon CanoScan LiDE 400 no power

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  • spleenharvester
    Badcaps Veteran
    • Mar 2010
    • 908
    • UK
    #1

    Canon CanoScan LiDE 400 no power

    This USB-C scanner came to me with no signs of life. Upon opening I found a cooked inductor that appeared to be getting +3.3V at one side and nothing at the other. After replacing the inductor I got +3.3V at both sides, but still no signs of life, with the AP1402 power control IC nearby getting hot. On all tries since I get +3.3V at the inductor for about 10 seconds and then it falls to 0V, AP1402 does not heat. I am guessing AP1402 is kaput and I am SOL but is there anything else I can check? All other caps around AP1402 measure only about 10 ohms to ground, none of them get hot

    Edit: I've tried injecting +3.3V into the inductor with a bench power supply. It pulls 1.5A and immediately AP1402 gets extremely hot, nothing else.
    Attached Files
    Last edited by spleenharvester; 09-05-2025, 11:25 AM.
    Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD
    Tags: None
    • spleenharvester
      Badcaps Veteran
      • Mar 2010
      • 908
      • UK
      #2
      Decided to scrap this one after more work - I found a shorted diode but all of my further testing on various rails always resulted in AP1402 sinking loads of current, and there were shorts randomly appearing and disappearing too. Unable to source a replacement for AP1402 (and my QFN skills are rubbish anyway)
      Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

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