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17” CDT Color Monitor 107B7
34
7-9. Power Supply Trouble Shooting Chart
BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM
POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 60V – 154.5V
(DEPENDING EPENDING UPON H.SYNC FREQUENCY)
(B) CONSTANT OUTPUT : 6.3V, 14V,80V
BEAD SET
A
BNORMAL VARIABLE OUTPUT
NG
OK
NG
OK
OK
NG
NG
OK
OK
OK
NG
OK
NG
YES
NO
CHECK BRIDGE
RECTIFIED CIRCUIT
CHECK START C.K.T
CHECK IC101 PIN39,
40,41, B+ DRIVER
CHECK D925
CHECK Q911
Q911 FAILURE
CHECK IC901
CHECK AC LINE
VOLT 120V OR 220V
CHECK F901, SW901
CHECK LINE RECTIFIED
&
SMOOTHED VOLT
CHECK SENSE RESISTENCE
IC901 FAILURE
CHECK T901 O/P
MAKE SURE THAT
THE
VARIABLE OUTPUT IS NO
T
SHORTED
OK
R939, R940, D912, ZD903
6.5V CIRCUIT OUTPUT
IC101 PIN30 (ABOUT5V)
CHECK 56V, 14.5V
CHECK THE 56V OUTPUT