Read Sony DSC-P52 (serv.man4) Service Manual online
6-34
DSC-P52
5. Contrast Adjustment (SY-91 board)
Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Note: Do either of “Adjustment without Using Oscilloscope” or
“Adjustment Using Oscilloscope”.
5-1. Adjustment without Using Oscilloscope
Mode
PLAY (
)
Signal
Arbitrary
Measurement Point
Data of page: 40, address: 11, 12
Measuring Instrument
Adjustment Page
4F
Adjustment Address
8A
Specified Value
0B0 to 0B8
Adjusting method:
Order Page Address Data
Procedure
1
00
01
01
Set the data.
2
40
F1
01
Write the data.
3
4F
02
03
Write the data.
4
40
10
00
Write the data.
5
40
10
90
Write the data.
6
40
11
Read the data, and this data is
named D
named D
11A
.
7
40
12
Read the data, and this data is
named D
named D
12A
.
8
40
10
91
Write the data.
9
40
11
Read the data, and this data is
named D
named D
11B
.
10
40
12
Read the data, and this data is
named D
named D
12B
.
11
Calculate D
A
and D
B
using
following equation.
(Hexadecimal calculation.)
(Note1)
(Hexadecimal calculation.)
(Note1)
D
A
= (D
11A
×
4+ D
12A
/ 40)
D
B
= (D
11B
×
4+ D
12B
/ 40)
12
Calculate the signal level using
following equation.
(Hexadecimal calculation.)
When D
following equation.
(Hexadecimal calculation.)
When D
A
D
B
Signal level = D
A
– D
B
When D
A
< D
B
Signal level = D
B
– D
A
13
When the signal level satisfies the
specified value proceed to step 16,
in case of others proceed to step
14.
specified value proceed to step 16,
in case of others proceed to step
14.
14
4F
8A
Change the data. (Note2)
15
4F
8A
Write the data, and return to step
4.
4.
16
4F
02
00
Write the data.
17
40
F1
00
Write the data.
18
00
01
00
Set the data.
Note1: When dividing D
12A
or D
12B
by 40. If there is a fraction below
decimal point, truncate it.
Note2: When the signal level is smaller than specified value, increase the
data. (The data should be “00” to “7F”.)
5-2. Adjustment Using Oscilloscope
Mode
PLAY (
)
Signal
Arbitrary
Measurement Point
CL802 (Pin ws of IC801) (VG)
Measuring Instrument
Oscilloscope
Adjustment Page
4F
Adjustment Address
8A
Specified Value
A = 2.42
±
0.05V
Adjusting method:
Order Page Address Data
Procedure
1
00
01
01
Set the data.
2
40
F1
01
Write the data.
3
4F
02
03
Write the data.
4
4F
8A
Change the data and set the
voltage (A) to the specified
value. (Note1)
voltage (A) to the specified
value. (Note1)
5
4F
8A
Write the data.
6
4F
02
00
Write the data.
7
40
F1
00
Write the data.
8
00
01
00
Set the data.
Note1: The data should be “00” to “7F”.
Fig. 6-1-18.
White(100%)
White(100%)
A
2H
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