Acer AL1716 AL1716x Service Guide - Page 33
Check C815, D806, R812
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Output Voltage Unstable /( Check Vbe of 801 below 0.3V :&4 :&4 Check circuit if short :&4 Check Q801, Q802 /( Check ZD801, ZD802, ZD803, D803, D805 /( Check reference voltage :&4 :&4 Check pinR of IC801 :&4 Check R810, R811 /( Check R809, R814, IC801, R818 Check feedback circuit :&4 &/% /( Check Vpin3-4 of IC801 about 6V :&4 /( Check C815, D806, R812 Check Vpin1-2 of IC801 about 1V :&4 Check R809, R814 33