Power Supply Trouble Shooting Chart - Acer AF715 Series Service Manual

6-10 POWER SUPPLY TROUBLE SHOOTING CHART

BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A) CONSTANT OUTPUT : 6.5V, 16V, 80V, 180 V, -10V
BEAD SET
CHECK AC LINE
VOLT 120V OR 220V
NG
OK
CHECK LINE RECTIFIED
& SMOOTHED VOLT
NG
OK
CHECK START C.K.T CHECK START C.K.T
ZD902,Q904,D909,R908
D909, Q904, R922, R925
NG
OK
CHECK T901 O/P
NG
OK
CHECK IC901
NG
OK
CHECK Q901
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CHECK F901, SW901
CHECK BRIDGE
RECTIFIED CIRCUIT
CHECK POWER SAVING
C.K.T(OFF-MODE)
CHECK 180V,80V,
NG
CHECK 80V, 55V, 14.5V
16V, 6.5V
CHECK Q901
6.3V CIRCUIT
CIRCUIT
IC901 FAILURE
21
ABNORMAL VARIABLE OUTPUT
MAKE SURE THAT
THE VARIABLE
OUTPUT IS NOT SHORTED
NO
CHECK IC401
PIN 4, 5, 6, B+ DRIVER
YES
CHECK THE C934
VOLTAGE 55V
NG
CHECK D919
OK
CHECK Q911
NG
Q911 FAILURE
OK
CHECK Q912, Q914, Q915
OK