Dell 5480 can't power on

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phamquynh
Posts: 5
Joined: Wed Oct 18, 2017 2:35 pm

Dell 5480 can't power on

Post by phamquynh » Sat Nov 11, 2017 6:26 am

hi team, pls support:
Dell 5480, have 3.3v at bottom power press, press power bottom pin 125 IO (SYS_PWR_SW#) from 3.3v to 0v. Have 3.3v at power ic (3v 5v power ic). with laptop 5v have after press bottom power. at the moment lost of ALW_On from IO to Pin 1 of IC power enable to 5v. RCT circuit ok, LID_SW=3.3v. Tks all!
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phamquynh
Posts: 5
Joined: Wed Oct 18, 2017 2:35 pm

Re: Dell 5480 can't power on

Post by phamquynh » Sat Nov 18, 2017 8:38 am

This one done already! root cause of this failure are filter capacitors of 3v, 5v power.
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