Sharp LC-20S4U-S - 20" LCD TV, Service Manual And Parts Listparts List

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LC-20S4U-S
14
5. Take the following procedure when IC2009 (EEPROM) has been initialized or
IC2001 (microprocessor) replaced.
5-1. Connect pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
5-2. Make sure "20" (inches) is selected for the screen size.
5-3. Make sure the model number "A627B" is selected.
(Onscreen display of adjustment process menu page 1)
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
1
M O D E L 6 A 2
2
O F
7 B
0
0
F
I N C H S I Z E
E R R O R N O R E S E T
P U B L I C M O D E
0
1
2
3
4
O F F
1
V
–
C H I P
E X T C O N T R O L
5
6
6. Adjustments
6-1. Common bias adjustment
1) Select the "COM BIAS" mode on adjustment process menu page 2. Press the CURSOR RIGHT/LEFT keys
to generate the built-in signal.
2) Using the "cursor RIGHT/LEFT" keys, readjust the setting so that flickering gets to minimum.
3) To quit the built-in signal pattern, press the "cursor UP/DOWN" keys. The adjustment process mode screen
reappears.
6-2. TAMP adjustment
1) Feed the 100% white raster signal through the antenna input.
2) See if the "YDATA" reading on adjustment process menu page 2 is within the range in the table below. If not,
select the "NTSC TAMP" item on the same page. Press the "cursor RIGHT/LEFT" keys to scroll down the
item. Using the "cursor RIGHT/LEFT" keys again, readjust the "YDATA" reading to within the range shown
below.
Then reduce 24 from the "NTSC TAMP" setting and enter this value for "PAL-M TAMP" and "PAL-N TAMP".
3) Finally press the "cursor UP/DOWN" keys to return to the adjustment process mode screen.
Reference
(Onscreen display of adjustment process menu page 1)
Model numbe LC-20S4U-S
Setting (NTSC) 155-158
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
1 0
5 1
0
5
5 1 8
5 1 8
2 1 0
9
6
9 6
T A M P L
Y D A T A
T A M P H
0
1
2
3
4
N T S C T A M P
P A L
–
T M A M P
P A L
–
T N A M P
5
6
7
8
Y data
(white 100%)