Acer AL1716 AL1716x Service Guide - Page 34

2.3 Output power is unstable Unstable power Check sampling Circuit :&4 Check the R pin voltage of IC803 about 2.5V :&4 Check pin1 of IC802 voltage is 5.8V /0 Check R810, R811,R818 /0 Check the C pin voltage of IC803 if 3V :&4 Check R809, R808, R814, D809 /0 Check D806, C815 if short /0 Change R810, R811, R818 /0 Change IC803 Change D806, C815 :&4 Check pin3 of IC802 voltage about 1V :&4 &/% /0 Change R801, R805, R822, R823, R817 2.4 Backlight can't be turned on 34