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Acer X221 Service Manual page 46

Service guide
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3. Always show "NO SIGNEL"
Change
Cable
"NO SIGNEL"
NO
Check VGA
VGA Check
C23,C24,R44,R4
Change
R42,R43,FB1,R
44,R45 C23,C24
Cable
Yes
Yes
5
NO
Change U4
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X221w

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