Troubleshooting; Power Board Troubles - Acer AL1716 Service Manual

ACER AL1716W
14
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4.1 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, 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

4. Troubleshooting

OK It is not power board problem.
NG Turn switch on.
NG Connect the cables whether to be correct connected.
NG Check F801, T801, R802, D801 whether to be damaged.
NG Check R807, D804, I801 whether to be damaged.
NG Check peripheral component of I801 whether to be damaged.
NG Check Q803, R813, R814, D806 whether to be damaged
NG Check D804 and R807 whether to be damaged
Check D809, D810, C818, C824, C823, C822, T802 whether to
NG
be damaged.