Acer X221 Service Guide - Page 45
Missing Color, Missing Color, Change, Cable, R1,R5,R10, Change U4, or CN2 Cable, or Panel,
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Page 45 highlights
2. Missing Color Change NO Cable Change NO R1,R5,R10, U2 NO Change U4 or CN2 Cable or Panel NO Adjustment R/G/B Color Missing Color Check VGA Cable Yes Check R27,R29,R31 Yes Check CN2 LVDS Signal Yes Check OSD R/G/B Gain Yes Change Panel