Acer AC501 AC501 Monitor Service Guide - Page 23

4. TROUBLE SHOOTING A. Power Supply Check S ta rt Check Yes fuse open Check and repaor EMI Filter and Q901, I/P Rectifer R909, U901, R907 Is Q901 VDS No waveform normally? Check and repaor Q902, Q903, U901, D908, R931 D909, R908 Is 13V in spec? Is 7.5V in spec? Is 60V voltage correct? No Check VR901, D941, A942, Q943 No Check D940, Q940, R945, D951 No Check D942, C946 Combine with No monitor check operating frequency? OK S to p Check and repair R919, R912, R918, C912 23