Tip For Triggering Any Laptop To Switch It “ON”
Without On/Off switch you can trigger the laptop motherboard to switch it on for troubleshooting. This way you can also confirm that laptop ON/OFF switch is working ok or itself bad.
On workbench while troubleshooting any laptop motherboard without schematics it is very difficult to trace the ON /OFF triggering switch connection and you have to remove whole On/Off Button Unit from the laptop this is extra and delicate work may damage the plastic lock or “FFC” cable while removing the Unit.
Location of Power Switch:
Location of Power switch cable socket on Motherboard:
Here is the simple trick as follows.
Just find out location of On/Off switch FFC cable Connector on the Motherboard.
Connect the power adaptor on laptop and power it “ON”. Now set the multimeter in voltage range and check and find on which pin of the connector you are getting 3.3V DC i.e. Stand by voltages.(referred by various name I.e. “PS ON”, “NBPSON#”,”PWR BT#” and so on and may vary manufacturer wise).
After confirming the voltage just short that 3.3V (Stand By) pin to nearby grounding point on the motherboard “for a moment”, this will trigger the Laptop to switch “ON” mode.
Or you can trace the signal going from Super I/O or PCH (now a day’s new generation board having PCH chip instead of Super I/O and it embedded all the functions of I/O in this single chip) using Multimeter on Buzzer mode keep one probe on Connector socket (Refer Above Photo) and with other probe touch on every pin of I/O chip one by one multimeter Buzz on particular pin that is trigger pin.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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