Power Board - Acer AL2002 Service Manual

Power board

Check output
voltage +5V and +22V whether if
correct supply
NG
Check power switch whether if turn on
OK
Check power cord
(P801), signal cable (P302), P101,
P102, P103, P104 is correct
connected
OK
Check C805 value is about
140Vdc -330Vdc
OK
Check C807 is greater than 11V
OK
Check I801 pin6 has same pulse
OK
Check T802 PIN1 has same pulse or
not
OK
Check peak voltage of R811 triangle
pulse is up to 0.52V or not
OK
Check D809, D810,
C818, C824, C823, C817, C822, T802
have same short circuit or the output
+5V/+22V is over load
OK
Check feedback circuit around I802, I803 and
the other components and repair them
Appendix 4: Troubleshooting
OK It is not power board problem.
NG Turn switch on.
Connect the cables whether to be correct
NG
connected.
Check F801, D807, D808, D805, D812, or
NG
P801 whether to be damaged
Check R807, D804, I801 whether to be
NG
damaged.
Check peripheral component of I801
NG
whether to be damaged.
Check Q803, R813, R814, D806 whether
NG
to be damaged
Check D804 and R807 whether to be
NG
damaged
Check D809, D810, C818, C824, C823,
NG C817, C822, T802 whether to be
damaged.
1
ACER AL2002W
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