Acer AL1712 AL1712 Service Guide - Page 28

2. No Characters , Missing one color No Change Power Board Check Inverter From Power board OK ? No Check or Change Cable Or Panel No Change VGA Cable No Characters Missing one color Check CN2 12Vdc Output OK Check L6 5Vdc Output OK Check U1(pin2) 2.5Vdc Output OK Check U7(pin2) 3.3Vdc Output OK Check CN1 to Panel Signal Output OK Check X'Tal 14.318 Mhz ? OK Check H , V SYNC ? OK Change U2 No Change Power Board No Check or Change U6 , Q6 , D1 No Check or Change U1 No Check or Change U7 No Change X1 3. No Audio No Audio Check Input source Or Change CN7 No Check Input Signal CN7 OK ? OK No Check CN5 to Speaker OK ? Change Speaker or CN5(Cable) OK Change U8 or Q9 or U5 No Check U8(Pin6)Volume & Q9 & U5 OK ? OK Check U8Pin12(Mute) & Q8 & U5 OK ? No Change U8 or Q8 or U5 - 28 -