Acer X221 Service Guide - Page 46
Always show NO SIGNEL, NO SIGNEL, Change, Cable, Change U4
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3. Always show "NO SIGNEL" Change Cable "NO SIGNEL" NO Check VGA Cable Yes VGA Check C23,C24,R44,R4 5 Yes Change U4 NO Change R42,R43,FB1,R 44,R45 C23,C24