HP L1702
30
9.2.2 Power Board
No Power
Check AC line volt 110V or 220V
Check AC line
Check the voltage of C904(+)
Check bridge rectified circuit and F901circuit
Check start voltage for the pin3 of IC901
Check R906, R907 and change IC901
Check the auxiliary voltage is bigger than 10V and smaller than 20V
1) Check IC901
2) Check ZD901,Q901,Q902…OVP circuit
OK
CheckIC901 Pin8 PWM wave
NG
Check CON102 Pin12 =12V, Pin3,4=5V
OK
NG
Check IC901
Check Q903,R917,D910,D911,ZD904
OK
NG
OK
OK
OK
NG
NG
NG
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