Table of Contents
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trouble-shooting
1. Power Supply Trouble
N
N
Change the power board
N
Check the power
control circuit of
QP1
QP1
Check if the pin No.1 of CNA1 is 5VSB
Check if the pin No.7 and No.8 of CNA1
is 5V, and if No.10 is 12V
N
N
Check if the voltage
on No.2 of CNA1 is
high level
N
UP8(RT8250)
is damaged
Change
UP8(RT8250)
Check if the pin No.2 of UP2
Y
Y
Y
Check if the 1.2V
control circuit of
UP8 is 1.2V
N
Y
Check if the pin No.3 of
UP8 is PWM signal
Check if L5/47 H is
welded of damaged.
N
Change
UP8
OK
-78-
Y
Y
is 3.3VSB
Check the
circuit of
Check the voltage
of UP4/3/3V,UD4/1.5V
Y
N
Change
damaged
circuit LDO
O
Y
Change or
weld L5.
OK
N
UP2
UP2
Y
The power
modules is
OK
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