Read Sony DVP-FX740DT Service Manual online
8-1
DVP-FX740DT
SECTION 8
TROUBLESHOOTING
8-1. ELECTRICAL TROUBLE SHOOTING GUIDE
No power on
by adaptor
No power on
by battery
Is adaptor
out 9.5V?
YES
NO
Is P1 OK?
Replace P1
Is D2 OK?
NO +3.3V
NO P_3V3
NO +1.8V
Is U3 OK?
Replace U3
Is Q12 OK?
Is U3 OK?
Replace Q12
NO LCD
power
Replace U3
Is U4 OK?
Replace U4
Replace D2
Replace adaptor
Is battery OK?
Replace Q5
Is Q5 OK?
Replace battery
AUDIO OUT ABNORMAL
SPEAKER ABNORMAL
Is J9, J10 or TCN4,
TCN5 OK?
Replace J9, J10 or
TCN4, TCN5
Replace U13
Replace U7 (MT1389LP)
Replace speaker
Is U13 OK?
Is speaker OK?
Check audio jack & mode
Check U14
Check signals from
U7 (MT1389LP)
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
1. A. Power (DC-DC Converter) circuit
B. Audio out abnormal
C. Speaker abnormal
Is U3 OK?
NO +5V
Replace U3
NO
YES
Replace U2
NO
Replace U15
NO
Is USB_VCC
OK?
YES
Is AVCC
OK?
YES
Is U5 OK?
Replace U5
NO
YES
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