Pwpc Board - Sony S75F Service Manual

6.2 PWPC board

No Power
Check AC line voltage 110V or 240V
Check the voltage of
Check start voltage for the pin3 of IC901
Check the auxiliary voltage is smaller than 24V
Check R904, D902,D904, ZD903
Check to CN902 Pin5=12.0V and
pin9 = 5.0V
NG
NG
OK
NG
OK
OK
Repeating the start voltage
NG
OK
OK
Check Interface board
Change F901 , check BD901,Q903,IC901
Check bridge rectified circuit
NG
1) Check IC902, IC903
2) Check Q901,Q902...OVP circuit
43
S75F Sony
Change IC901