Acer AL1716 AL1716x Service Guide - Page 32
DC output voltage is unstable
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No power &LED off :&4 Check primary rectifier voltage /0 /0 Check circuit if short Check IC802, C805, T801 :&4 Check pin3 of IC802 voltage about 1V :&4 Check F801, F802, P801, D801 /0 Check R801, R805, R822, R823, R817 :&4 Check pin2 of IC802 voltage about 2V :&4 /0 Check R803, R807, R824, R825 Check pin1 of IC802 voltage is 5.8V /0 Check R812, R816, C818 :&4 &/% 2.2 DC output voltage is unstable 32