Troubleshooting; Electrical Trouble Shooting Guide; Power (Dc-Dc Converter) Circuit - Sony DVP-FX850 Service Manual

9-1. ELECTRICAL TROUBLE SHOOTING GUIDE

1. A. Power (DC-DC Converter) circuit
No power on
by adaptor
YES
NO
Is adaptor
Replace adaptor
out 9.5V?
YES
NO
Is P1 OK? Replace P1
YES
NO
Is D2 OK? Replace D2
YES
NO. P_3V3
YES
NO
Is Q12 OK? Replace Q12
YES
NO
Is U6 OK? Replace U6
B. Audio out abnormal
AUDIO OUT ABNORMAL
Check audio jack & mode
YES
Check U19
YES
Check U17
YES
Check U18
YES
NO
Check signals from
U7 (MT1389)
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SECTION 9

TROUBLESHOOTING

No power on
by battery
YES
Is battery OK?
YES
Is Q1 OK?
YES
NO. +3.3V
YES
NO
Is U5 OK? Replace U5
YES
NO. +1.8V
YES
NO
Is U4 OK? Replace U4
C. Speaker abnormal
SPEAKER ABNORMAL
Is S1, S2 OK?
YES
Is speaker OK?
YES
Is U14 OK?
YES
Replace U7
NO
Replace battery
NO
Replace Q1
NO. +5V
YES
NO
Is U2 OK? Replace U2
YES
NO
Is –AVCC
Replace U15
OK?
NO
Replace S1, S2
NO
Replace speaker
NO
Replace U14
9-1
DVP-FX850
NO.
LCD power
YES
NO
Is U1 OK? Replace U1
YES
NO
Is –USB VCC
Replace U21
OK?