Sharp AQUOS LC-22SV2E, Service Manual

Page: 12 / 84

12
LC-22SV2E
4. Adjustment
4-1. +B (5V) adjustment (R3750 : Main Unit)
1) Receive the colour bar signal.
2) Adjust the voltage of the positive (+) side of C3724 to 5.00 ±0.02V.
Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.
4-2. +B (13V) adjustment (R4657 : Digital Unit)
1) Receive the colour bar signal.
2) Connect the digital voltmeter to TP4751, and adjust to 13.00 ±0.05V.
Note: Since 13.00V is a reference voltage of all power voltage, adjust it precisely.
4-3. Counter-bias adjustment
Please perform this adjustment to each "50Hz" and "60Hz".
1) Enter the process adjustment mode.
2) Select the "14" (Dot reversal flicker pattern) of "G/A TEST PATTERN" on page 19 of the adjustment process
mode.
3) Select the "COM BIAS 60"/"COM BIAS 50" on page 2 of the adjustment process mode.
4) Adjust the flicker of a screen to be minimum.
4-4. TAMP adjustment
1) Receive the colour bar signal.
2) See if the "Y" reading on page 2 of the adjusment process mode is somewhere following. If not, make the
"PAL TAMP" adjustment to get the "Y" reading in the range of "BB" thru "CA".
3) If the adjustment of "PAL TAMP" is executed, write its adjustment value to the "SECAM TAMP" manually.
(Screen of the page 2 of the adjustment processing menu OSD)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
2
C O M B I A S 6 0
C O M B I A S 5 0
5 7
P A L T A M P
S E C A M T A M P
2 4
2 4
R X 1 G X 1 B X 1
R Y 1 G Y 1 B Y 1
R
Y
Y 2 G Y 2 B Y 2
R X 2 G X 2 B X 2
C U T O F F
5
–
0 2 1
3 2 0
4 5
7 5
0 2 1
2 2 5 3 2 0
4 5
7 6 8 6
4 5
0 2 1
T A M P H
T A M P L
C 0
C A
B B
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Y Data
(White 75%)
4-5. White balance adjustment
1) Receive the following signal.
Window pattern signal having left 70% white and right 40% white.
2) Adjust the "RY1, GY1, BY1" and "RY2, GY2, BY2" on page 2 of the adjustment process mode to be best
condition.
It is about "RY1, GY1, BY1" at 40% gray.
It is about "RY2, GY2, BY2" at 70% gray.
Adjusting value; x=0.257, y=0.264 (40% gray)
x=0.274, y=0.284 (70% gray)
Note:This adjustment must be done after aging for 30 minutes or longer.