Sony DSC-U20 (serv.man4) Service Manual ▷ View online
DSC-U20
6-27
6.
PSIG Adjustment
Set the amplitude of the pre-charge pulse for driving the LCD to
the specified value.
the specified value.
Mode
PLAY
Signal
Arbitrary
Measurement Point
Data of page: 50, address: 86, 87,
8E and 8F (2byte data) (Note 1)
8E and 8F (2byte data) (Note 1)
Adjustment Page
4F
Adjustment Address
85
Specified Value
VP = 14C to 154
Note 1:
2byte data is upper 1byte data and lower 1byte data.
XX XX
Lower 1byte data
(Page: 50, address: 87 or 8F)
Upper 1byte data
(Page: 50, address: 86 or 8E)
(Page: 50, address: 87 or 8F)
Upper 1byte data
(Page: 50, address: 86 or 8E)
Adjusting method:
Order Page Address
Data
Procedure
1
Perform “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
2
40
89
03
[Set]
3
4F
85
38
[Write]
4
50
90
01
[Set]
5
50
90
00
[Set]
6
50
86
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
7
50
87
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
8
This 2byte data (Note
1) is named VP1.
1) is named VP1.
9
50
8E
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
10
50
8F
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
11
This 2byte data (Note
1) is named VP2.
1) is named VP2.
12
Calculate VP using
following equations.
(hexadecimal calcula-
tion)
following equations.
(hexadecimal calcula-
tion)
VP = VP1 – VP2
(VP: absolute value)
13
Check that the VP
satisfies the specified
value. (Note 2)
satisfies the specified
value. (Note 2)
Note 2:
When VP does not satisfy the specified value, select page:
4F, address: 85, and write the different data (refer to the
following table), then retry the procedure from 4 to 13.
4F, address: 85, and write the different data (refer to the
following table), then retry the procedure from 4 to 13.
VP is smaller than the specified value
Increase the data
VP is larger than the specified value
Decrease the data
Processing after Completing Adjustment:
Order Page Address
Data
Procedure
1
40
89
00
[Set]
2
Release “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
DSC-U20
6-28
7.
V-COM Adjustment
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 LCD screen
Measuring Instrument
Adjustment Page
4F
Adjustment Address
82
Specified Value
The brightness difference
between the section-A and
section-B is minimum
between the section-A and
section-B is minimum
Note:
Perform “Bright Adjustment”, “Contrast Adjustment” and
“PSIG Adjustment” before this adjustment.
“PSIG Adjustment” before this adjustment.
Adjusting method:
Order Page Address
Data
Procedure
1
Perform “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
2
40
89
42
[Set]
3
4F
82
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.
4
4F
82
[Write]
Subtract 3 from the
data, and write this
data.
data, and write this
data.
Processing after Completing Adjustment:
Order Page Address
Data
Procedure
1
40
89
00
[Set]
2
Release “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
Fig. 6-1-9
A
A
A
A
B
B
B
B
DSC-U20
6-29
8.
White Balance Adjustment
Correct the white balance.
If deviated, the LCD screen color cannot be reproduced.
If deviated, the LCD screen color cannot be reproduced.
Note:
Check the white balance only when replacing the follow-
ing parts. If necessary, adjust them.
1. LCD901 (LCD panel)
2. IC401
1. LCD901 (LCD panel)
2. IC401
8-1.
White Balance Adjustment (VR)
Mode
PLAY
Signal
Arbitrary
Measurement Point
Data of page: 50, address: 88 and
89 (2byte data) (Note 1)
89 (2byte data) (Note 1)
Adjustment Page
4F
Adjustment Address
86
Specified Value
VR = EB to F3
Note 1:
2byte data is upper 1byte data and lower 1byte data.
XX XX
Lower 1byte data
(Page: 50, address: 89)
Upper 1byte data
(Page: 50, address: 88)
(Page: 50, address: 89)
Upper 1byte data
(Page: 50, address: 88)
Adjusting method:
Order Page Address
Data
Procedure
1
Perform “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
2
40
89
02
[Set]
3
4F
86
8C
[Write]
4
50
90
01
[Set]
5
50
90
00
[Set]
6
50
88
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
7
50
89
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
8
This 2byte data (Note
1) is named VR1.
1) is named VR1.
9
50
90
01
[Set]
10
50
90
00
[Set]
11
50
88
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
12
50
89
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
13
This 2byte data (Note
1) is named VR2.
1) is named VR2.
14
In case of VR2 VR1,
repeat steps 9 to 13
several times.
repeat steps 9 to 13
several times.
15
Calculate VR using
following equations.
(hexadecimal calcula-
tion)
following equations.
(hexadecimal calcula-
tion)
VR = VR1 – VR2
(VR: absolute value)
16
Check that the VR
satisfies the specified
value. (Note 2)
satisfies the specified
value. (Note 2)
Note 2:
When VR does not satisfy the specified value, select page:
4F, address: 86, and write the different data (refer to the
following table), then retry the procedure from 4 to 13.
4F, address: 86, and write the different data (refer to the
following table), then retry the procedure from 4 to 13.
VR is smaller than the specified value
Decrease the data
VR is larger than the specified value
Increase the data
Processing after Completing Adjustment:
Order Page Address
Data
Procedure
1
40
89
00
[Set]
2
Release “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
DSC-U20
6-30
8-2.
White Balance Adjustment (VB)
Mode
PLAY
Signal
Arbitrary
Measurement Point
Data of page: 50, address: 84, 85,
8C and 8D (2byte data) (Note 1)
8C and 8D (2byte data) (Note 1)
Adjustment Page
4F
Adjustment Address
87
Specified Value
VB = 112 to 11A
Note 1:
2byte data is upper 1byte data and lower 1byte data.
XX XX
Lower 1byte data
(Page: 50, address: 85 or 8D)
Upper 1byte data
(Page: 50, address: 84 or 8C)
(Page: 50, address: 85 or 8D)
Upper 1byte data
(Page: 50, address: 84 or 8C)
Adjusting method:
Order Page Address
Data
Procedure
1
Perform “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
2
40
89
02
[Set]
3
4F
87
80
[Write]
4
50
90
01
[Set]
5
50
90
00
[Set]
6
50
84
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
7
50
85
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
8
This 2byte data (Note
1) is named VB1.
1) is named VB1.
9
50
8C
[Read]
Read the data
(Upper 1byte).
(Upper 1byte).
10
50
8D
[Read]
Read the data
(Lower 1byte).
(Lower 1byte).
11
This 2byte data (Note
1) is named VB2.
1) is named VB2.
12
Calculate VB using
following equations.
(hexadecimal calcula-
tion)
following equations.
(hexadecimal calcula-
tion)
VB = VB1 – VB2
(VB: absolute value)
13
Check that the VB
satisfies the specified
value. (Note 2)
satisfies the specified
value. (Note 2)
Note 2:
When VB does not satisfy the specified value, select page:
4F, address: 87, and write the different data (refer to the
following table), then retry the procedure from 4 to 13.
following table), then retry the procedure from 4 to 13.
VB is smaller than the specified value
Decrease the data
VB is larger than the specified value
Increase the data
Processing after Completing Adjustment:
Order Page Address
Data
Procedure
1
40
89
00
[Set]
2
Release “Data setting
during LCD system
adjustment”
(Refer to page 6-22)
during LCD system
adjustment”
(Refer to page 6-22)
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