No Power On - Acer AL702 Service Manual

9. No power on

9.1 No power on (I)
Trou bl e Sh ooti ng
Check output voltage +5V,
+15V is right or not.
OK
NG
Check power switch is turn on
or not.
NG
OK
Check power cord ( P801), Signal cable
(P302),P802, P803, CN102, CN103
is connected right or not.
NG
OK
Check C805 is about DC
140V-330V or not.
NG
OK
Check C807 is over
10V or not.
NG
OK
Check pin 6 of I801 have
same pulse or not.
NG
OK
Check pin 1 of T802 have
same pulse or not.
NG
OK
Check peak voltage of R811 triangle
pulse is up to 1 volt or not.
NG
OK
Check D809, D810, C816, C821, T802
have same short circuit, or the output
+5V, +15V is over load.
OK
NG
Check feedback circuit around I802,
I803 and the other components
and repair them.
It is not power board
problem.
Turn switch on.
Connect it right.
Check F801, D801, P801
and repair them.
Check R805, R803, I801
and repair them.
Check peripheral components
of I801 and repair them.
Check Q803, R813, R814, D806
, R812 and repair them.
Check D804, R807 and
repair them.
Repair them.
A L C502
Page 11