Dell Insipiron missing EN ALWSON

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  • elmann
    New Member
    • Nov 2022
    • 3
    • Romania
    #1

    Dell Insipiron missing EN ALWSON

    Hello everyone, I have a Dell Inspiron 15 laptop, motherboard dell vegas 15341-1.
    The laptop does not start, does not provide 3.3V ALWS and 5V ALWS because it does not receive enable from EC (ALWON signal is missing). The ISL circuit provides ACOK for EC but EC no longer provides ALWON for the 3.3V and 5V ALWS source built with TPS51225. EC is supplied with 3V from 3VLDO from TPS51225. On the power button I have 3V and it reaches EC.
    EC is on page 24 in the attached file.
    Please tell me what other conditions can inhibit EC that not to provide ALWON? I looked at the schematic, but I can't tell if the EC is faulty or is it something else.
    Thank you

    MOD Edit: Link to schematic - https://www.badcaps.net/forum/showthread.php?t=79497
    .
    Last edited by SMDFlea; 08-30-2023, 02:31 PM.
    Tags: None
    • elmann
      New Member
      • Nov 2022
      • 3
      • Romania
      #2
      Re: Dell Insipiron missing EN ALWSON

      The EC chip does not have an external quartz crystal, it has an internal oscillator, at pins 123 and 125, where the quartz crystal would have been connected, I have no signal. If the oscillator is internal, should there be an oscillatory signal on them or not?.
      The rest pin RESET OUT pin (73) is zero but I don't know if it is in the reset state or EC is not working and that is why it is in zero?
      There is a 32625 Hz RTC signal on the CPU but the clock signal does not come from the CPU to the EC on pin 25
      Last edited by elmann; 08-27-2023, 12:31 PM.

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