DOWNLOAD Sharp LC-20B5E (serv.man7) Service Manual ↓ Size: 35.9 KB | Pages: 10 in PDF or view online for FREE

Model
LC-20B5E (serv.man7)
Pages
10
Size
35.9 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Adjusting procedure of each section
File
lc-20b5e-sm7.pdf
Date

Sharp LC-20B5E (serv.man7) Service Manual ▷ View online

13
LC-20B5E
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 exclusive-use AC adapter or stable DC power supply.
LC-20B5E/E(K)/E(F) AC adapter: UADP-A063WJPZ
DC power supply: 12 (V) 5.6 (A)
1. Adjusting procedure
Power on 
 Adjust process mode (bus connector) 
 Adjustments of common bias, TV contrast and white balance
2. Entering the adjust process mode
Turn on the power while keeping either KEY4 (pin (81) of the microprocessor) or KEY5 (pin (82) of the
microprocessor) at "L".
3. Operating the keys in the adjust process
3-1. Basic operation
• Tune in with the CH UP/DOWN keys or the direct channel select key.
• Select an item to be adjusted with the cursor UP/DOWN keys.
(When the cursor DOWN key is pushed at the bottom, it moves to the top on the next page, and when the cursor
UP key is pushed at the top, it moves to the bottom on the previous page.)
• Adjust the selected item with the VOL UP/DOWN keys or the cursor LEFT/RIGHT keys.
• When the menu key is pushed, the next item appears. (When the key is pushed at the bottom, the top on the next
page appears.)
• When the manual memory key is pushed, the top item reappears. (When the key is pushed at the top, the top
on the previous page appears.)
• When the auto preset key is pushed, the top on the next page appears.
3-2. Moving through the layers
• On the third page, when the ENTER key is pushed at any item other than I
2
C DATA, the setting page of the item
appears.
• To quit the setting page, push the previous-page key.
3-3. Adjusting the address display items
• At the items OSD COLOR, NTSC and CARD on the G/A page, or at the item EDGE ENHANCEMENT on the
S2300 page, when the VOL UP/DOWN keys or the cursor RIGHT/LEFT keys are pushed, the register select mode
appears. (The cursor moves to the first address.)
• In the register select mode, the cursor moves up and down with the CH UP/DOWN keys, and moves left and right
with the VOL UP/DOWN keys or the cursor LEFT/RIGHT keys. Select an address to be adjusted and push the
direct channel select key "12". This procedure moves the cursor to the right-side value for the address. Adjust
the setting with the VOL UP/DOWN keys or the cursor LEFT/RIGHT keys. Push the direct channel select key "12"
with the cursor at the right-side value, and the register select mode appears again. Pushing the cursor UP/DOWN
keys, the menu key or the like leads to the other item.
4. Initialization
4-1. Initialize the product when IC2005 (E
2
PROM) or IC2001 (microprocessor) has been replaced.
4-2. Bring pins (81) and (82) of IC2001 (microprocessor) to GND, and then turn on the power.
4-3. Power on (Initialization) 
 Setting the model and the screen size (inches) 
 Transmitting the data for the
model to the setting E
2
PROM (I
2
C)
4-4. Check the model. (A664) *Note: The model number cannot be changed.
4-5. Select the screen size (inches) (20).
4-6. Send the transmitting data (E
2
PROM-written data for the microprocessor) for the model.
14
LC-20B5E
5. Adjusting
5-1. Adjusting the common bias
       1) Make the non-signal state in the video input mode.
       2) Fit the designated tool at the center of the screen.
       3) Observe the output from the tool with the oscilloscope.
       4) Adjust the "COM BIAS" setting on Page 2 of the adjust process to minimize the wave's peak-peak level.
5-2. Adjusting the TAMP
       1) Receive the upper left of 75% white half colour bar signal.
       2) If the reading of "YDATA" on Page 2 of the adjust process is not within the range in the table below, adjust
the "PAL TAMP" setting on the same page to bring the "YDATA" setting in the range below.
~
Keep in mind that the setting may vary from model to model.
       3) Pushing the TAMP direct key finishes the "PAL TAMP" adjustment. Now the setting will be automatically
copied to "SECAM TAMP".
Model
LC-20B5E/E(F)/E(K)
Setting
174~189
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
0
0
T
A
M
P
L
7
1
1
4
Y
D
T
A
H
8
1
5
T
A
M
P
A
8
1
9
0
0
0
0
0
.
0
0
.
0
0
1
1
1
.
0
T
A
M
P
T
A
M
P
3
0
P
A
L
3
0
S
E
C
A
M
F
R
C
U
T
O
F
F
G
C
U
T
O
F
F
B
C
W
B
W
B
W
B
U
T
O
F
R
G
A
I
N
G
G
A
I
N
B
G
A
I
N
0
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Y Data
(White 75%)
(Screen on Page 2 of the adjust process menu)
5-3. Adjusting the white balance
       [Input signal] Feed the composite video signal of 80% white for the screen's left, and 40% for its right.
[Settings]
80% white
x
0.291
y
0.293
40% white
x
0.279
y
0.272
[Adjusting with the bus]
Gain
Vary RB.
Keep G fixed. (not adjusted)
Cut-off Vary RB.
Keep G fixed. (not adjusted)
Initial settings of the white balance
R CUTOFF: 0
G CUTOFF: -32
B CUTOFF: 0
WB R-GAIN: 1.00
WB G-GAIN: 1.00 WB B-GAIN: 1.00
15
LC-20B5E
6. Factory settings
Make the factory settings with the adjusting remote controller.
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 15 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.
MODEL
A664
V E R
R O M
~ ~ ~ ~
Reset 0
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
Key name
Remote control code
2Set OSD language
German
English
Factory setting 1
Factory setting 2
100000111111110
100000001010110
Model
LC-20B5E
LC-20B5E(K)
French
Factory setting 4
100001001011110
LC-20B5E(F)
16
LC-20B5E
8. Public mode
• How to enter into Public mode (It is necessary to turn on the Public mode in advance in the process mode.)
1. Turn off TV by pressing MAIN POWER switch.
2. While pressing "VOL(+)" key and "CH(
ù
)" key at the same time, press MAIN POWER switch for more than
2 seconds.
TV will turn on, and you will see the screen display a setting of PUBLIC MODE.
• Setting screen of  “Public mode”
1. You can select each item of functions by pressing cursor UP/DOWN keys or CH(
ù
)/(
Ù
) Keys on the remote
control or CH(
ù
)/(
Ù
) keys on the LCD TV. The letter of selected item turns yello when you selected it.
2. The setting position of each item of functions is made by pressing cursor RIGHT/LEFT keys on the remote
control or VOL (+)/(–)keys on the LCD TV.
3. Select ENTER position after you set all functions, and press cursor RIGHT/LEFT keys on the remote control
or VOL(+)/(–)keys on the LCD TV for confirmation.
Unless otherwise, the settings will not be memorized.
• 6 Public Mode settings for public application
1. MAXIMUM VOLUME (1—————60)
You can set the maximum volume at your desired level.
2. VOLUME FIXED (VARIABLE
FIXED)
You can fix the sound volume at your desired level.
When you set to "FIXED", the sound volume which you have just set is fixed.
3. REMOTE CONTROL (RESPOND
LIMITED)
If you set "LIMITED", remote control keys of POWER, CH(
ù
)/(
Ù
), VOL(–)/(+) and BACKLIGHT are
responded, but other keys are not responded.
This is a position in which you can not make MENU adjustments.
4. MENU DISPLAY (YES
LIMITED)
"No" setting:All the other items than below are not displayed on the menu.
No. 1 layer: Picture, Sound and all Features displayed
No. 2 layer: Picture, Sound and Feature "Timer functions" displayed
5. INPUT MODE START (NORMAL
AV1
AV2
CARD)
When any other item than "NORMAL" has been selected, the set gets started in the selected input mode at
the next switch-on.
6. INPUT MODE FIXED (NORMAL
FIXED)
(* This item cannot be selected if the start mode is "NORMAL".)
If "FIXED" has been selected, any channels and input modes other than those selected in the start mode cannot
be picked up.
7. RESET
You can cancel all Public Mode settings. (It returns to the factory setting.)
Factory setting
Public mode
Maximum volume
[              60]
Volume fixed
[VARIABLE]
Remote control
[RESPOND]
Menu display
[YES           ]
Input mode start
[NORMAL   ]
Input mode fixed
[NORMAL   ]
RESET
ENTER
 2 ··· 
 59 
 60
VARIABLE 
 FIXED
RESPOND 
 LIMITED
YES 
 LIMITED
NORMAL 
 AV1 
 AV2 
 CARD
NORMAL 
 FIXED
Adjust setting
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Sharp LC-20B5E (serv.man7) Service Manual ▷ Download

  • DOWNLOAD Sharp LC-20B5E (serv.man7) Service Manual ↓ Size: 35.9 KB | Pages: 10 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Sharp LC-20B5E (serv.man7) in PDF for free, which will help you to disassemble, recover, fix and repair Sharp LC-20B5E (serv.man7) LCD. Information contained in Sharp LC-20B5E (serv.man7) Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.