Sony DSC-P71 / DSC-P71M (serv.man2) Service Manual ▷ View online
5-36
DSC-P71/P71M
Fig. 5-1-18
A
2H
5. PSIG Gray Adjustment (PK-064 Board)
Set the common electrode drive signal level of LCD to the speci-
fied value.
fied value.
Mode
PLAY
Signal
Arbitrary
Measurement Point
Pin 8 of CN903
(PANEL_COM)
(PANEL_COM)
Measuring Instrument
Oscilloscope
Adjustment Page
A
Adjustment Address
87
Specified Value
A = 5.0
± 0.1 Vp-p
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
A
02
03
Press PAUSE button
3
4
F1
02
4
A
87
Change the data and set the PSIG
signal level (A) to the specified
value. (Note)
signal level (A) to the specified
value. (Note)
5
A
87
Press PAUSE button.
Note:
Adjust it between data 00 and 7F.
Processing after Completing Adjustment:
Order Page Address Data
Procedure
1
A
02
00
Press PAUSE button
2
4
F1
00
3
0
01
00
6.
D Range Adjustment (PK-064 Board)
Set the D Range of the RGB decoder for driving the LCD to the
specified value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
specified value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
Mode
PLAY
Signal
Arbitrary
Measurement Point
Pin 9 of CN903 (VG)
External trigger: Pin 8 of
CN903 (PANEL_COM)
External trigger: Pin 8 of
CN903 (PANEL_COM)
Measuring Instrument
Oscilloscope
Adjustment Page
A
Adjustment Address
85
Specified Value
A = 7.96
± 0.05 Vp-p
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
A
02
03
Press PAUSE button
3
4
F1
03
4
A
85
Change the data and set the
voltage (A) to the specified
value. (Note)
voltage (A) to the specified
value. (Note)
5
A
85
Press PAUSE button.
Note:
Adjust it between data 00 and FF.
Processing after Completing Adjustments:
Order Page Address Data
Procedure
1
A
02
00
Press PAUSE button
2
4
F1
00
3
0
01
00
A
2H
Pedestal
Pedestal
A: Pedestal level difference between 1H period and
previous 1H period.
Fig. 5-1-19
5-37
DSC-P71/P71M
2H
A
Pedestal
10 steps peak
A: Between the pedestal and 10 steps peak
8. Contrast Adjustment (PK-064 Board)
Set the level of the VIDEO signal for driving the LCD to the speci-
fied value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
fied value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
Mode
PLAY
Signal
Arbitrary
Measurement Point
Pin 9 of CN903 (VG)
External trigger: Pin 8 of CN903
(PANEL COM)
External trigger: Pin 8 of CN903
(PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
A
Adjustment Address
8A
Specified Value
A = 2.50
± 0.05 Vp-p
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
A
02
03
Press PAUSE button
3
4
F1
03
Change the data and set the
4
A
8A
voltage (A) to the specified
value. (Note)
value. (Note)
5
A
8A
Press PAUSE button.
Note:
Adjust it between data 00 and 7F.
Processing after Completing Adjustments:
Order Page Address Data
Procedure
1
A
02
00
Press PAUSE button
2
4
F1
00
3
0
01
00
Fig. 5-1-21
7. Black Limit Adjustment (PK-064 Board)
Set the maximum amplitude of the RGB decoder for driving the
LCD to the specified value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
LCD to the specified value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
Mode
PLAY
Signal
Arbitrary
Measurement Point
Pin 8 of CN903 (PANEL COM)
Measuring Instrument
Oscilloscope
Adjustment Page
A
Adjustment Address
86
Specified Value
A = 8.30
± 0.07 Vp-p
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
A
02
03
Press PAUSE button
3
4
F1
08
Change the data and set the
4
A
86
voltage (A) to the specified
value. (Note 1)
value. (Note 1)
5
A
86
Press PAUSE button.
Note 1:
Adjust it between data 00 and 0F.
Note 2:
Check that the adjusted value of D range is within speci-
fied value after this adjustment is performed.
If not, perform the adjustment again.
fied value after this adjustment is performed.
If not, perform the adjustment again.
Processing after Completing Adjustments:
Order Page Address Data
Procedure
1
A
02
00
Press PAUSE button
2
4
F1
00
3
0
01
00
Fig. 5-1-20
A
V
5-38
DSC-P71/P71M
10. V-COM DC Adjustment (PK-064 Board)
Set the DC bias of the common electrode drive signal of LCD to
the specified value.
If deviated, the LCD display will be move, producing flicker and
conspicuous vertical lines.
the specified value.
If deviated, the LCD display will be move, producing flicker and
conspicuous vertical lines.
Mode
PLAY
Signal
Arbitrary
Measurement Point
Check on the LCD screen
Measuring Instrument
Adjustment Page
A
Adjustment Address
84
Specified Value
The brightness difference
between the section-A and
section-B is minimum
between the section-A and
section-B is minimum
Note 1:
Perform “Bright Adjustment” and “Contrast Adjustment”
before this adjustment.
before this adjustment.
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
A
02
03
Press PAUSE button
3
4
F1
82
4
A
84
Change the data so that
brightness of the section A
and section B is equal.
brightness of the section A
and section B is equal.
5
A
84
Read the data and this data is
named Dref.
named Dref.
6
Convert Dref to decimal
notation, and obtain Dref’.
(Note 2)
notation, and obtain Dref’.
(Note 2)
7
Calculate D
84
’ using
following equations.
(decimal calculation)
D
(decimal calculation)
D
84
’ = Dref’ – 02
8
Convert D
84
’ to a hexadeci-
mal number, and obtain D
84
.
(Note 2)
9
A
84
D
84
Press PAUSE button.
Note 2:
Refer to table 5-2-2. “Hexadecimal-decimal conversion
table”.
Processing after Completing Adjustments:
Order Page Address Data
Procedure
1
A
02
00
Press PAUSE buttton
2
4
F1
00
3
0
01
00
Fig. 5-1-22
A
A
A
A
B
B
B
B
9. Center Voltage Adjustment (PK-064 Board)
Set the center level of VIDEO signal for driving the LCD to the
specified value.
specified value.
Mode
PLAY
Signal
Arbitrary
Measurement Point
Pin 9 of CN903 (VG)
Measuring Instrument
Digital voltmeter
Adjustment Page
A
Adjustment Address
8B
Specified Value
A = 7.00
± 0.05 Vp-p
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
A
02
03
Press PAUSE button
3
4
F1
03
Change the data and set the
4
A
8B
DC voltage (A) to the specified
value. (Note)
value. (Note)
5
A
8B
Press PAUSE button.
Note:
Adjust it between data 00 and 7F.
Processing after Completing Adjustments:
Order Page Address Data
Procedure
1
A
02
00
Press PAUSE button
2
4
F1
00
3
0
01
00
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DSC-P71/P71M
11. White Balance Adjustment (PK-064 Board)
Correct the white balance.
If deviated, the LCD screen color cannot be reproduced.
If deviated, the LCD screen color cannot be reproduced.
Mode
PLAY
Signal
Arbitrary
Measurement Point
Check on the LCD screen
Measuring Instrument
Adjustment Page
A
Adjustment Address
88, 89
Specified Value
LCD screen must not be colored
Note 1:
Check the white balance only when replacing the fol-
lowing parts. If necessary, adjust them.
lowing parts. If necessary, adjust them.
1. LCD panel
2. Light induction plate
3. IC801
2. Light induction plate
3. IC801
Adjusting method:
Order Page Address Data
Procedure
1
0
01
01
2
A
02
03
Press PAUSE button
3
4
F1
02
4
A
88
90
Press PAUSE button.
(Intital value)
(Intital value)
5
A
89
83
Press PAUSE button.
(Intital value)
(Intital value)
6
Check that the LCD screen is
not colored. If not colored,
proceed to “Processing after
Completing Adjustments”.
not colored. If not colored,
proceed to “Processing after
Completing Adjustments”.
7
A
88
Change the data so that the
LCD screen is not colored.
LCD screen is not colored.
89
(Note 2)
Note 2:
To write in the non-volatile memory (EEPROM), press
the PAUSE button each time to set the data.
the PAUSE button each time to set the data.
Processing after Completing Adjustments:
Order Page Address Data
Procedure
1
A
02
00
Press PAUSE button
2
4
F1
00
3
0
01
00
