Read Sharp LC-20B2EA (serv.man4) Service Manual online
9
LC-20B2EA
10
LC-20B2EA
4. Initialization
When the microprocessor (IC2001) or the EEPROM (IC2004) has been replaced or when the EEPROM has been
initialized, readjust the each adjustments.
4-1. Connect the pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
4-2. Select the model name to (C2EA).
4-3. Select the inch size (20).
4-4. LED changes green from red after setting finish and about 15 seconds, initialization is completed, and it
initialized, readjust the each adjustments.
4-1. Connect the pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
4-2. Select the model name to (C2EA).
4-3. Select the inch size (20).
4-4. LED changes green from red after setting finish and about 15 seconds, initialization is completed, and it
becomes adjustment mode.
5. Adjustment
5-1. +B adjustment...Page 1 +B-ADJ
Adjust the voltage of the pin (13) of P2002 to 5.00
±
0.02V.
Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.
5-2. Counter-bias adjustment
Vary the "COM BIAS" setting on Page 2 of the adjustment process mode so that the contrast be sharpest
(black looks most sinking).
(black looks most sinking).
5-3. TAMP adjustment
1) Receive the upper left of 75% white half colour bar signal.
2) See if the “Y” reading on page 2 of the adjusment process mode is somewhere following. If not, make the
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 BF thru C9.
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
2
1
0
P
A
L
T
A
M
P
2
7
S
E
C
A
M
T
A
M
P
2
7
G
C
U
T
O
F
F
R
C
U
T
O
F
F
0
–
5
B
C
U
T
O
F
F
G
3
B
3
R
3
0
0
0
0
0
0
–
1
G
1
B
4
Y
0
0
0
0
B
E
T
A
M
P
H
T
A
M
P
L
C
A
B
B
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Y Data
(White 75%)
5-4. White balance adjustment
Adjust “RCUTOFF” and “BCUTOFF” on the page 2 of the adjustment processing so as to obtain the colour
of the same level as the standard set.
Note: For the adjustment processing of “RCUTOFF” and “BCUTOFF”, adjust them in the indication value
range of ... –9, –7, ... –1, +1, ... +7, +9.
When it becomes even-numbered value, side favor noise sometimes occurs in the monochrome signal of
the specific gradation.
of the same level as the standard set.
Note: For the adjustment processing of “RCUTOFF” and “BCUTOFF”, adjust them in the indication value
range of ... –9, –7, ... –1, +1, ... +7, +9.
When it becomes even-numbered value, side favor noise sometimes occurs in the monochrome signal of
the specific gradation.
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LC-20B2EA
6. Factory Setting
6-1. Perform a factory setting after completing all adjustments.
6-2. A “POWER” keys is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.
6-3. “K” of the inspection process mode is displayed on the screen upper left.
6-4. CH (
6-2. A “POWER” keys is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.
6-3. “K” of the inspection process mode is displayed on the screen upper left.
6-4. CH (
) and VOL (+) keys are pushed about 2 seconds at the same time.
6-5. Release keys, if “E” is displayed on the screen upper left and “COMPLETE” is displayed on the bottom of it.
6-6. After a while, a power will be in a standby mode and a setup will be finished.
Note: “First installation” serves on “Deutsch”.
6-6. After a while, a power will be in a standby mode and a setup will be finished.
Note: “First installation” serves on “Deutsch”.
7. Lamp error detection
7-1. Functional description
This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety
when the lamp or lamp circuit is abnormal.
If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed,
the followings occur.
when the lamp or lamp circuit is abnormal.
If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed,
the followings occur.
The main unit of television is turned OFF 5 seconds after it is turned ON. (The power LED on the front side
of TV turns from green to red.)
of TV turns from green to red.)
If the situation
happens 5 times sequentially, television can not be turned ON. (The power LED remains
red.)
7-2. Countermeasures
7-2-1. Check when turning OFF the lamp error detection
7-2-1. Check when turning OFF the lamp error detection
When television is turned OFF by the lamp error detection mentioned above, it enters the adjustment
process with the power LED red. Entering the adjustment process turns OFF the error detection and turns
ON TV.
This enables the operation check to detect errors in the lamp or lamp circuit.
Check whether "ERROR NO RESET" on line 9, page 1 of the adjustment process is 1 or more. If it is 1 or
more, it indicates the lamp error detection was executed.
process with the power LED red. Entering the adjustment process turns OFF the error detection and turns
ON TV.
This enables the operation check to detect errors in the lamp or lamp circuit.
Check whether "ERROR NO RESET" on line 9, page 1 of the adjustment process is 1 or more. If it is 1 or
more, it indicates the lamp error detection was executed.
7-2-2. Resetting of the lamp error count
After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO
RESET" on line 9, page 1 of the adjustment process and set the number to 0 using the volume button.
RESET" on line 9, page 1 of the adjustment process and set the number to 0 using the volume button.
1
+ B – A D J
160
M O D E L
C2EA
V E R
1 . 2 0
Reset 0
Afterwards, perform the operation check to confirm that the lamp error detection does not function.
Page 1 of the adjustment process
I N C H
SIZE
20
N T S C
PWM F R E Q
0C0
P A L
PWM F R E Q
0 BD
N T S C
PWM D U T Y
0
P A L
PWM D U T Y
0
T V
GAIN
OFF
ERROR
N O
R E S E T
5
PUBLIC MODE
OFF
C 2 E A