Acer AL1706 AL1706 Service Guide - Page 34

No raster YES LED Green? YES Backlight can not be turned on YES Is there 12Vdc voltage on pin13 of IC501? YES Is there high-level voltage on pin8 of IC501 YES Check CN501, CN502, CN503 and CN504? YES NO NO Is Ok fuse F501? NO NO Is R526 Ok? NO F501 open Check power supply YES Check I/F board R526 open Connecting the output connector again NO Is there pulse waveform on pin1, pin3, pin15 and pin16 of IC501 at the moment of restart? YES NO Is ok T501, T502? YES Check protected circuit Q501, Q502, Q503, Q504 Is Ok IC501? NO T501, T502 fail YES U501, U502 fail IC501 fail END 34