Sony DVP-FX921 / DVP-FX930 / DVP-FX930WM / DVP-FX935 Service Manual ▷ View online
8-1
DVP-FX921/FX921K/FX930/FX930CC/FX930WM/FX935
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. +5.2V
NO. +1.8V
Is U2 OK?
Replace U2
Is U3 OK?
Is U3 OK?
Replace U3
NO.
LCD power
LCD power
Replace U3
Is U1 OK?
Replace U1
Replace D2
Replace adaptor
Is battery OK?
Replace Q2
Is Q2 OK?
Replace battery
AUDIO OUT ABNORMAL
SPEAKER ABNORMAL
Is J7, J8 OK?
Replace J7, J8
Replace U14
Replace U6
Replace speaker
Is U14 OK?
Is speaker OK?
Check audio jack & mode
Check U16
Check U15
Check signals from
U6 (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
YES
1. A. Power (DC-DC Converter) circuit
B. Audio out abnormal
C. Speaker abnormal
8-2
DVP-FX921/FX921K/FX930/FX930CC/FX930WM/FX935
VIDEO OUT ABNORMAL
OPEN/CLOSE ABNORMAL
NO CHARGING
Is 9.5V OK?
Check P1
Is Q4 OK?
Replace Q4
Is SW1 OFF?
Replace SW1
Is J2 OK?
Replace J2
Check SW3 & SW4
Check the connection of part
Check traverse
PICTURE ABNORMAL
DISC ERROR
Check video jack J4 & mode
Check the disc
Check disc
Check the traverse
Check traverse
Check the U9 (SDRAM)
Refer to servo part
Refer to servo part
Check U11 filter
Check video signals from
U6 (MT1389LP)
YES
YES
YES
D. Video out abnormal
G. Open/close abnormal
H. Charging circuit
E. Picture abnormal
F. Disc error
NO
NO
NO
NO
Refer to servo part
8-3
DVP-FX921/FX921K/FX930/FX930CC/FX930WM/FX935
Power is on
Does logo appear
on the screen?
Check power & clock
Does
the moving picture
of the DVD disc play
on the screen
normally?
Does
the moving picture
of the CD disc play
on the screen
normally?
Is MPEG data
signal normal?
Is error signal
normal?
Check CD/DVD
DSP output signal
Check MPEG decoder
input signal
Is clock normal?
Check clock signal
Check clock signal
Does the audio
signal output from MPEG
decoder?
Does the
audio sound output
normally?
2. MPEG Circuit
NO
NO
NO
YES
YES
YES
YES
YES
OK
OK
U6 (MT1389LP)
U6 (MT1389LP)
OK
YES
NO
YES
NO
NO
NO
YES
NO
NO
Check CD/DVD
DSP output signal
Check MPEG decoder
input signal
Check CD/DVD
DSP output signal
Check MPEG decoder
input signal
Is MPEG data
signal normal?
8-4
DVP-FX921/FX921K/FX930/FX930CC/FX930WM/FX935
START
Power on
Power
green LED
on
Do all
the buttons work
normally?
Does
remote control work
normally?
Check DV33
Does
U6 (MT1389LP)
OK?
Does IR1 work
by testing waveform
normally?
Check remote
control
Check
U1
U6 (MT1389LP)
Replace remote control
Replace IR1
Replace U1
Is DV33 OK?
Check power
3. Front Circuit
YES
YES
YES
NO
YES
YES
NO
YES
NO
NO
NO
NO
NO
NO
YES
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