Sony DVP-FX850, Service Manual

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9-1
SECTION 9
TROUBLESHOOTING
DVP-FX850
9-1. 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. P_3V3 NO. +3.3V NO. +5V
NO. +1.8V
Is Q12 OK? Replace Q12 Is U5 OK? Replace U5 Is U2 OK?
Is U1 OK?
Is –AVCC
OK?
Replace U2
NO.
LCD power
Replace U15
Replace U1
Is U4 OK? Replace U4
Replace U6 Is U6 OK?
Replace D2
Replace adaptor
Is battery OK?
Replace Q1 Is Q1 OK?
Replace battery
AUDIO OUT ABNORMAL SPEAKER ABNORMAL
Is S1, S2 OK? Replace S1, S2
Replace U14
Replace U7
Replace speaker
Is U14 OK?
Is speaker OK?
Check audio jack & mode
Check U19
Check U17
Check U18
Check signals from
U7 (MT1389)
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO NO NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
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 –USB VCC
OK?
Replace U21
NO