Lenovo thinkpad L420 not powering on

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James ngugi
Posts: 8
Joined: Mon Sep 11, 2017 1:44 pm

Lenovo thinkpad L420 not powering on

Postby James ngugi » Thu Nov 09, 2017 2:44 pm

I have a Lenovo thinkpad L420 laptop that will not power on.



The motherboard code is DAGC9EMB8E0 REV E

The laptop will not switch on and does not charge

There is no voltage(3.3V) on the battery connector at all

5V and 3.3V is also missing. 20V line is okay on all sections of motherboard



I do not have schematic of this motherboard. Somebody please help me repair this motherboard



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

Re: Lenovo thinkpad L420 not powering on

Postby phamquynh » Thu Nov 16, 2017 9:41 am

how many curent display when you using power supply machine?
parwaanaa
Posts: 1
Joined: Wed Nov 22, 2017 3:27 am

Re: Lenovo thinkpad L420 not powering on

Postby parwaanaa » Wed Nov 22, 2017 4:54 am

check the 3.3 volts or 5 volts ic input volt enable volt ref volt ac ok volt ac detect volt

also check the short if 3.3 volt line is short then u not gonna see 3.3 volt any where use ur brain all laptop r same power rail if u dont have schematic then download ic data sheet



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gauranand
Posts: 3
Joined: Wed Nov 22, 2017 7:02 pm

Re: Lenovo thinkpad L420 not powering on

Postby gauranand » Wed Nov 22, 2017 7:19 pm

im havinh same problem

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