Surface Pro 4 drawing no current, no power on

survivalbloke

Badcaps Veteran

Join Date: Aug 2021

Posts: 268

Country: United States
#1

Surface Pro 4 drawing no current, no power on

06-22-2023, 09:51 AM

Hi! I have a surface pro 4 here which will not power up and pulls no current plugged in. Some preliminary testing shows 14v on the drain of the 1st mosfet, but nothing coming out of the source. What additional questions can I answer? Any thoughts?
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ahmypc

Senior Member

Join Date: Oct 2013

Posts: 78

Country: Turkey
#2

07-02-2023, 05:44 PM

Re: Surface Pro 4 drawing no current, no power on

Is the adapter's charging light on? If the charging light is on, it is the IT8528VG chip that opens these mosfets.
If the charging light is not on, the problem is more complex.
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mon2

Badcaps Legend

Join Date: Dec 2019

Posts: 13913

Country: Canada
#3

07-02-2023, 06:51 PM

Re: Surface Pro 4 drawing no current, no power on

See attached for the power sequence (in shown circles).
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Surface Pro 4 drawing no current, no power on

Surface Pro 4 drawing no current, no power on

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