Philips 107B7 - Manual (Page 34)

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
ABNORMAL 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 NOT
SHORTED
OK
R939, R940, D912, ZD903
6.5V CIRCUIT OUTPUT
IC101 PIN30 (ABOUT5V)
CHECK 56V, 14.5V
CHECK THE 56V OUTPUT