Sony DVP-FX870 / DVP-FX875 Service Manual ▷ View online
7-1E
7-1. STANDARD VIDEO LEVEL
1. Checking Video Output Level
<Purpose>
This checks whether Video Output level satisfy the NTSC stan-
dard. If it is not correct, the brightness will be too large or small.
This checks whether Video Output level satisfy the NTSC stan-
dard. If it is not correct, the brightness will be too large or small.
Mode
Play
Signal
Check the Color-bar (100%) signal
on DVD reference disc
on DVD reference disc
Measurement Point
LINE OUT (VIDEO) connector
(75
(75
Ω
terminated)
Measuring Instrument
Oscilloscope
Specification
1.00
±
0.05 Vp-p
Checking method:
1) Confirm that the Video Output level is 1.00
1) Confirm that the Video Output level is 1.00
±
0.05 Vp-p.
Figure 7-1
7-2. VCOM DC LEVEL
1. VCOM DC Level Adjustment
<Purpose>
When the LCD Board or LCD is replaced, the VCOM DC Level
Adjustment is necessary.
When the LCD Board or LCD is replaced, the VCOM DC Level
Adjustment is necessary.
Mode
Play
Signal
Arbitrary
Measurement Point
VCOM (LCD Board)
Measuring Instrument
Digital voltmeter
Specification
4.0 V to 4.1 V
Adjusting method:
1) Adjust the VR1 to attain 4.0 V to 4.1 V.
1) Adjust the VR1 to attain 4.0 V to 4.1 V.
Figure 7-2
SECTION 7
ELECTRICAL ADJUSTMENT
DVP-FX870/FX875
This section describes procedures and instructions necessary for
adjusting electrical circuits in this set.
adjusting electrical circuits in this set.
Instruments required:
1) Color monitor TV
2) Oscilloscope 1 or 2 phenomena, band width over 100 MHz,
2) Oscilloscope 1 or 2 phenomena, band width over 100 MHz,
with delay mode
3) Frequency counter (over 8 digits)
4) Digital voltmeter
5) Standard commander (RMT-D183)
6) DVD reference disc
4) Digital voltmeter
5) Standard commander (RMT-D183)
6) DVD reference disc
HLX-504 (J-6090-088-A) (single layer) (NTSC)
HLX-505 (J-6090-089-A) (dual layer) (NTSC)
HLX-507 (J-6090-078-A) (dual layer) (PAL)
HLX-505 (J-6090-089-A) (dual layer) (NTSC)
HLX-507 (J-6090-078-A) (dual layer) (PAL)
1.00
±
0.05 Vp-p
VCOM
VR1
LCD BOARD (SIDE A)
8-1
SECTION 8
TROUBLESHOOTING
DVP-FX870/FX875
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. P_3V3
NO. +3.3V
NO. +5V
NO. +1.9V
Is Q4 OK?
Replace Q4
Is U5 OK?
Replace U5
Is U1 OK?
Is U1 OK?
Replace U1
NO.
LCD power
LCD power
Replace U1
Is U21 OK?
Replace U21
Replace U2
Is U2 OK?
Replace D2
Replace adaptor
Is battery OK?
Replace Q1
Is Q1 OK?
Replace battery
AUDIO OUT ABNORMAL
SPEAKER ABNORMAL
Is J7, J8 OK?
Replace J7, J8
Replace U16
Replace U7
Replace speaker
Is U16 OK?
Is speaker OK?
Check audio jack & mode
Check U20
Check U18
Check U19
Check signals from
U7 (MT1389HD)
YES
YES
YES
YES
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
1. A. Power (DC-DC Converter) circuit
B. Audio out abnormal
C. Speaker abnormal
8-2
VIDEO OUT ABNORMAL
OPEN/CLOSE ABNORMAL
NO CHARGING
Is 9.5V OK?
Check P1
Is Q2, U2 OK?
Replace Q2, U2
Is U6 OK?
Replace U6
Is Q2 OK?
Replace Q2
Is J2 OK?
Replace J2
Check SW2 & SW3
Check the connection of part
Check traverse
PICTURE ABNORMAL
DISC ERROR
Check video jack & mode
Check the disc
Check disc
Check the traverse
Check traverse
Check the U12 (SDRAM)
Refer to servo part
Refer to servo part
Check LC filter
Check video signals from
U7 (MT1389HD)
YES
YES
YES
YES
D. Video out abnormal
G. Open/close abnormal
H. Charging circuit
E. Picture abnormal
F. Disc error
NO
NO
NO
NO
NO
Refer to servo part
8-3
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 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
MT1389HD
MT1389HD
OK
OK
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?
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