Acer AL1722 AL1722 Service Guide - Page 40

2. No picture (LED is orange) No picture NG Key is under control? OK X401 oscillate waveform is normal Y601 oscillate waveform is normal NG Replace Y601 OK Replace U601 OK NG Replace X401 NG Check if the sync signal from computer is output and video cable is connected normally Replace U401 NG Input the sync signal of computer, or change the cable OK Replace U401 40