It's marked as Q4 so I think is a transistor or something like this. Tester return unknow or damage component, what kind of transistor is ?
It's possible it's a TI431 ?
Last edited by jasko_jacker; 10-24-2019, 09:57 AM.
Not quite sure. Take a look at the datasheet for sot23 markings. Search for PACKAGE OPTION ADDENDUM in the pdf.
TL431 is a voltage reference and wouldnt be marked as "Q" on the board.
OP: Try to get a schematic for that laptop. The circuit will tell you more.
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