Picture
Picture 1
1
Power Units Problem Solving
Power Units Problem Solving
In stand-by mode, Check TP1 have 12V?
Check the +5V and +3.3V test-point of main
board whether the voltage is correct or not
Power on the
machine
Check LDO IC U1; U4 、 U10 、
U3 、 Q1、Q2 burned or over
load short-circuit
test-point TP3 have 5V?
test-point TP2 have 12V?
test-point TP11 have
1.8V? ， test-point TP9
have 3.3V? test-point TP12
have 2.5V， test-point TP6
have 1.32V？
YN
OK
Check the power
network of U1,U21
N
Y
N
Y
Check their
external circuit
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