Acer AC501 AC501 Monitor Service Guide - Page 25
Check U303
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B-2 No picture No picture Check contrast & brightness control adjust to M AX. Check No input signal Check I/O cable Yes Check PC Check U301 PIN6 No vo;tage = 12VU301 PIN13 PULSE BLANKING Check Q201, D231 Check U301 No Check U301 PIN 14, 16, 19 output No Check connector Check C251 No voltage = 73VDC Check U303 PIN1, 2, 3 Check CRT 25