Dell Latitude 5501 Service Manual

Power button LED behavior

On certain Dell Latitude systems, the power button LED is used to provide an indication of the system status, and as a result the power button illuminates when pressed. The systems with the optional power button/fingerprint reader will have no LED under the power button and hence will apply the available LED's in the system to provide an indication of the system status.

Power button LED behavior without Fingerprint reader

  • System is ON (S0) = LED illuminates solid white.
  • System in Sleep/Standby (S3, SOix) = LED is off
  • System is Off/Hibernating (S4/S5) = LED is off
  • Pressing the power button for a duration between 50 msec to 2 sec turns on the device.
  • Power button does not register additional presses until the SOL (Sign-Of-Life) has been provided to the user.
  • System LED's illuminates upon pressing the power button.
  • All the available LED's (Keyboard backlit/ Keyboard caps lock LED/ Battery Charge LED) illuminates and displays specified behavior.
  • The auditory tone is Off by default. It can be enabled in the BIOS setup.
  • Safeguards do not time out if the device gets hung during the logon process.
  • Dell logo: Turns on within 2 secs after pressing the power button.
  • Full boot: Within 22 secs after pressing the power button.
  • Below is the example timelines:
Power On and LED behavior

Power button with fingerprint reader will have no LED and will leverage the available LED's in the system to provide indication of the system status

  • Power Adapter LED:
    • The LED on Power adapter connector illuminates white when power is supplied from electrical outlet.
  • Battery Indicator LED:
    • If the computer is connected to an electrical outlet, the battery light operates as follows:
      1. Solid white -the battery is charging. When the charge is complete the LED turns off.
    • If the computer is running on a battery, the battery light operates as follows:
      1. Off -the battery is adequately charged (or the computer is turned off).
      2. Solid amber -the battery charge is critically low. A low battery state is approximately 30 minutes or less of battery life remaining.
  • Camera LED
    • White LED activates when camera is on.
  • Mic Mute LED:
    • When activated (muted), the mic mute LED on the F4 Key should illuminate WHITE.
  • RJ45 LEDs:
    • Table 1. LED on either side of RJ45 portLED on either side of RJ45 port
      Link speed indicator (LHS)Activity indicator (RHS)
      GreenAmber

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