Acer A231H Service Guide - Page 74

Acer 3ēBacklight can't be turned on No raster? Yes LED Green? Yes Backlight can't be turned on. Yes Is there 5Vdc voltage on pin2 of IC501? No Check power supply Acer -LCD-A231H Yes Is there high-level voltage on No Yes Is Ok R505? pin6 of IC501? Check I/F board Yes Are connected rightly CN501, CN502, CN503 and CN504? Yes Is there instantaneously pulse wave on pin1, pin16 of IC501 at the moment of restart? Yes No Is ok T501? Yes Check feedback circuit ISEN1,ISEN2,VSEN,OLP1,OLP2 No No No R505 open Connecting the output connector again Yes Is Ok IC501? U501, U502 fail No IC501 fail T501fail END