Troubleshooting; Electrical Trouble Shooting Guide; Power (Dc-Dc Converter) Circuit - Sony DVP-FX720 Service Manual

QQ
3 7 63 1515 0

9-1. ELECTRICAL TROUBLE SHOOTING GUIDE

1. A. Power (DC-DC Converter) circuit
No power on
by adaptor
YES
NO
Is adaptor
out 9.5V?
YES
NO
Is P1 OK?
YES
NO
Is D22 OK?
YES
NO. P_3V3
YES
NO
Is Q46 OK?
YES
NO
Is U21 OK?
TE
L 13942296513
B. Audio out abnormal
AUDIO OUT ABNORMAL
Check audio jack & mode
YES
Check U15
YES
Check U14
YES
Check U13
www
YES
Check signals from
U3 (MT1389)
.
http://www.xiaoyu163.com

TROUBLESHOOTING

Replace adaptor
Replace P1
Replace D22
NO. +3.3V
YES
NO
Replace Q46 Is U20 OK?
YES
Replace U21 NO. +1.8V
YES
NO
Is U19 OK?
C. Speaker abnormal
SPEAKER ABNORMAL
Is SW15, SW16 OK?
Is speaker OK?
Is U11 OK?
x ao
NO
y
Replace U3
i
http://www.xiaoyu163.com
SECTION 9
8
No power on
by battery
YES
NO
Is battery OK? Replace battery
YES
NO
Is Q43 OK? Replace Q43
YES
NO. +5V
YES
Replace U20 Is U17 OK?
YES
Q Q
3 6 7 1 3
Is –AVCC
OK?
Replace U19
NO
Replace SW15, SW16
YES
NO
Replace speaker
YES
NO
YES
u163
.
9-1
2 9 9 4 2 8
NO.
LCD power
NO
YES
Replace U17
Is U17 OK?
YES
1 5 0 5 8 2 9 9 4
NO
Is –USB VCC
Replace U10
OK?
Replace U11
m
co
DVP-FX720
9 9
NO
Replace U17
2 8 9 9
NO
Replace U18