A field technician is troubleshooting a corporate laptop that exhibits no status LED lights and fails to respond when the power button is pressed. The technician suspects that static electricity or stored capacitor charge is locking up the Embedded Controller (EC). In what sequence should the technician perform a flea power drain (hard reset) to clear the system state?
- 1Unplug the AC power adapter and disconnect all external peripheral devices.
- 2Disconnect the internal battery cable from the motherboard connector.
- 3Press and hold the laptop power button for 15 to 30 seconds.
- 4Plug the AC power adapter back into the laptop without reconnecting the battery and attempt to power on.
Cevap
The correct sequence to perform a flea power drain is: 1) Unplug the AC power adapter and external peripherals, 2) Disconnect the internal battery cable from the motherboard, 3) Press and hold the power button for 15 to 30 seconds, and 4) Plug the AC power adapter back into the laptop without the battery to test power-on.
The correct procedural order requires isolating all electrical inputs first (AC adapter and external devices), followed by disconnecting the internal battery to completely cut off power sources. Pressing and holding the power button then bleeds off any residual 'flea power' stored in system capacitors, resetting the logic state of the Embedded Controller. Finally, testing the laptop powered strictly via the AC adapter confirms if system functionality is restored while isolating the battery as a variable.
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Embedded Controller (EC) hard reset and flea power drain procedure