Acer AL1702 AL1702 Service Guide - Page 26

12. Power Board Check output voltage +5V, +12V and 22V is right or not. Yes No It is not power board problem. Check power switch is turn on or not. No Yes Check power cord (P801), signal cable (P302), P802, P803, CN102, CN103 is connected right or not. No Yes Check C805 is about DC140V-330V or not. No Yes Check C807 is over 10V or not. No Yes Check pin 6 of I801 have same pulse or not. No Yes Check pin 1 of T802 have same pulse or not. No Yes Check peak voltage of R811 triangle pulse is up to 1 volt or not. No Yes Check D809, D810, D811, C818, C817, C822, T802 have same short circuit, or the output +5V/+12V/+22V is over load. No Yes Check feedback circuit around I802, I803 and the other components and repair them. Turn switch on. Connect it right Check F801, D801, P801 and repair them. Check R805, R803, I801 and repair them. Check peripheral co,of I801 and repair them. Check Q803, R813, R814, D806, R812 and repair them. Check D804, R807 and repair them. Repair them. Page 24 AL1702