Acer AL1716 Service Manual - Page 15

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ACER AL1716W

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4.1 Power board

Check output

voltage +5V and +22V whether if

correct supply

Check power switch whether if turn on

Check power cord

P801, signal cable P302, P103, P104

is correct connected

Check C805 value is about

140Vdc -330Vdc

Check C807 is greater than 11V

Check I801 pin6 has same pulse

Check T802 PIN1 has same pulse or

not

Check peak voltage of R811 triangle

pulse is up to 0.52V or not

Check D809, D810,

C818, C824, C823, C817, C822, T802

have same short circuit or the output

+5V/+22V is over load

Check feedback circuit around I802, I803 and

the other components and repair them

4. Troubleshooting

It is not power board problem.

Turn switch on.

Connect the cables whether to be correct connected.

Check F801, T801, R802, D801 whether to be damaged.

Check R807, D804, I801 whether to be damaged.

Check peripheral component of I801 whether to be damaged.

Check Q803, R813, R814, D806 whether to be damaged

Check D804 and R807 whether to be damaged

Check D809, D810, C818, C824, C823, C822, T802 whether to

be damaged.