LC-20B4E (serv.man7). Adjusting procedure of each section - Sharp TV Service Manual (repair manual)

lc-20b4e (serv.man7) service manual
Model
LC-20B4E (serv.man7)
Pages
4 Few pages! See other manuals at the bottom of the first or last page.
Size
16.11 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Adjusting procedure of each section
File
lc-20b4e-sm7.pdf
Date

Read Sharp LC-20B4E (serv.man7) Service Manual online

12
LC-20B4E
ADJUSTING PROCEDURE OF EACH SECTION
The best adjustment is made before shipping. If any position deviation is found or after part replace is performed,
adjust as follows.
Preparation for adjustments
Use the dedicated AC adaptor or stable DC power supply.
LC20B4E AC adaptor: UADP-0241CEPZ
DC power supply: 13V 5.4A
1. Adjusting procedure
• Checker adjustment
Power ON (Adjustment processing mode) 
→ 
+B adjustment 
 Counter bias adjustment 
→ 
TAMP (Contrast)
adjustment 
→ 
White balance adjustment
2. Entering the adjustment processing mode
There are the following two methods.
• Setting the pin (81)(KEY4) or pin (82)(KEY5) of IC2001 (microprocessor) to GND, turn on the power.
• A “POWER” key is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.(K of the inspection
process mode is displayed by the upper left of the image plane.) 
 Next, “CH (
Ù
)” and “VOL (–)” keys are pushed
at the same time.(It becomes the image plane of the adjustment process mode.).....When it is canceled, it is made
to turn it off.(Even off in the “MAIN POWER” key, off with R/C are good.)
3. Key operation in the adjustment process mode
• The receiving channel UP/DOWN is performed with the “CH (
ù
)/(
Ù
)” keys.
One push ... The UP/DOWN tuning is performed per channel.
Continuous push ... The UP/DOWN search is performed until a next receivable station is found.
• Various adjustments
The adjustment is performed for each item by the “MENU”, “Menu cursor”, “CH (
ù
)/(
Ù
)” or “VOL (+)/(–)” keys
(LCD TV set and remote control).
• Adjustment item is chosen with the Menu cursor upward/downward keys.
• The adjustment item makes a toggle operation with the “MENU” key input. (Next item)
If the “MENU” key is input while the bottom item is selected, it moves to the top item on the next page.
• Press the auto preset button on the remote controller in the adjustment process mode, and the top item of the
next page will show up regardless of which item appears now.
Page 1 
 Page 2 
 ... 
 Page 57 
 Page 1
• Press the manual memory button on the remote controller in the adjustment process mode, and the top item of
the same page will show up.
• UP/DOWN of each adjustment vale selected is performed with the VOL (+)/(–) keys input.
13
LC-20B4E
4. Initialization
When the microprocessor (IC2001) or the EEPROM (IC2008, IC2010) 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 (A522).
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.
4-5. Writing the model-by-model data
For the Ver.1.10A microprocessor, get it initialized first and then make the settings, listed below, on it. (The
microprocessor version is indicated at the bottom of Adjustment Process Page 1.)
4-6. Precautions in replacing the EEPROMs (IC2008 and IC2010)
When the EEPROMs (IC2008 and IC2010) have been replaced, be sure to replace also the microprocessor
(IC2001) with the one "Part No. RH-iXA522WJN1Q".
The version of the RH-iXA522WJN1Q microprocessor is 1.20A.
Ver.1.10A data reprogramming (INCH SIZE [20])
Adjustment process page
8
13
18
22
26
30
34
41
41
41
41
41
41
41
41
41
41
41
41
41
41
Item
PAL BRIGHTNESS
SECAM BRIGHTNESS
N358 BRIGHTNESS
N443 BRIGHTNESS
PAL-M BRIGHTNESS
PAL-N BRIGHTNESS
PAL60 BRIGHTNESS
DPS NLC A6
DPS NLC A8
DPS NLC AA
DPS NLC AC
DPS NLC AE
DPS NLC B0
DPS NLC B2
DPS NLC B6
DPS NLC BA
DPS NLC BC
DPS NLC BE
DPS NLC C6
DPS NLC CA
DPS NLC D0
OSD settings
 +5
 +5
 +5
 +5
 +5
 +5
 +5
0E 
 0B
0E 
 0A
18 
 1A
38 
 2A
3C 
 30
53 
 3B
4E 
 42
07 
 10
15 
 23
39 
 32
40 
 35
07 
 10
15 
 1B
50 
 55
14
LC-20B4E
5. Adjustment
5-1. +B adjustment...Page 1 +B-ADJ
Adjust the voltage of the pin (4) of P1902 to 5.00 ±0.02V with R3714.
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).
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 adjustment process mode is somewhere following. If not, make the
“PAL TAMP” adjustment to get the “Y” reading in the range of AE thru BD.
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)
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.
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
9
0
P
A
L
T
A
M
P
2
1
S
E
C
A
M
T
A
M
P
2
1
G
C
U
T
O
F
F
R
C
U
T
O
F
F
0
0
B
C
U
T
O
F
F
R
G
A
I
A
I
N
0
0
G
G
N
N
0
B
G
A
I
H
Y
T
A
M
P
T
A
M
P
L
 
 
 
 
 
0
B
B
A
6
D
E
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Y Data
(White 75%)
15
LC-20B4E
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 (
ù
) 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”.
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.
1
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.)
2
If the situation 
1
 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
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 3, 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 3, page 1 of the adjustment process and set the number to 0 using the volume button.
 1
M O D E L
A522
V E R
R O M 1 .   1  0 A
Reset 0
Afterwards, perform the operation check to confirm that the lamp error detection does not function.
Page 1 of the adjustment process
INCH
SIZE
20
ERROR
NO RESET
5
PUBLIC
MODE   OFF
EXT
CONTROL
OFF
EXT
MODE
UART
UPDATE
MODE
NORMAL
TEXT
RESET
OFF
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Here you can read online and download Sharp LC-20B4E (serv.man7) Service Manual in PDF. LC-20B4E (serv.man7) service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sharp LC-20B4E (serv.man7) LCD. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.