In the interests of user-safety (Required by safety regulations in some countries) the set should be restored
to its original condition and only parts identical to those specified should be used.
CONTENTS
» IMPORTANT SERVICE SAFETY PRECAUTION ........................................................................................2
» REPLACEMENT PARTS LIST....................................................................................................................86
» PACKING OF THE SET..............................................................................................................................99
LC-20B4U-B
Page
SHARP CORPORATION
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
LC-20B4U-S
2
2
LC-20B4U-B
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow:
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
CAUTION: FOR CONTINUED
PROTECTION A GAINST A RISK OF
FIRE REPLACE ONLY WITH SAME
TYPE F3701 (2.0A, 250V), F3702
(1.25A, 250V), F6700 (1.25A, 250V),
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks:
1. Inspect all lead dress to make certain that leads are
not pinched, and check that hardware is not lodged
between the chassis and other metal parts in the
receiver.
2. Inspect all protective devices such as non-metallic
control knobs, insulation materials, cabinet backs,
adjustment and compartment covers or shields, isolation
resistor-capacitor networks, mechanical insulators, etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
• Plug the AC cord directly into a 110~240 volt A C outlet,
and connect the DC power cable into the receiv er's DC
jack. (Do not use an isolation tr ansformer for this test).
• Using two clip leads, connect a 1.5k ohm, 10 watt
resistor paralleled by a 0.15µF capacitor in series with
all exposed metal cabinet parts and a known earth
ground, such as electrical conduit or electrical ground
connected to an earth ground.
• Use an AC voltmeter ha ving with 5000 ohm per v olt, or
higher, sensitivity or measure the AC voltage drop
across the resistor.
• Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
All checks must be repeated with the AC cord plug
connection reversed. (If necessary, a nonpolarized
adaptor plug must be used only for the purpose of
completing these checks.)
Any reading of 0.75V peak (this corresponds to 0.5 mA.
peak AC.) or more is e xcessive and indicates a potential
shock hazard which must be corrected before returning
the monitor to the owner.
Many electrical and mechanical parts in LCD television
have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
and shaded areas in the
Schematic Diagrams
For continued protection, replacement parts must be
identical to those used in the original circuit.
The use of a substitute replacement parts which do not
have the same safety characteristics as the factory
recommended replacement parts shown in this service
manual, may create shock, fire or other hazards.
components having such features are identified b y " å"
Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement
accoutumé à toute vérification de sécurité et aux conseils suivants.
AVERTISSEMENT
conduite électrique ou une prise de terre branchée à la
terre.
1. N'entreprendre aucune modification de tout circuit.
C'est dangereux.
2. Débrancher le récepteur avant toute réparation.
PRECAUTION: POUR LA
PROTECTION CONTINUE CONTRE
LES RISQUES D'INCENDIE,
REMPLACER LE FUSIBLE PAR UN
FUSIBLE DE MEME TYPE F3701
(2.0A, 250V), F3702 (1.25A, 250V),
• Utiliser un voltmètre CA d'une sensibilité d'au moins
5000Ω/V pour mesurer la chute de tension en travers
de la résistance.
• Toucher avec la sonde d'essai les pièces métalliques
exposées qui présentent une voie de retour au châssis
(antenne, coffret métallique, tête des vis, arbres de
commande et des boutons, écusson, etc.) et mesurer
la chute de tension CA en-travers de la résistance.
Toutes les vérifications doivent être refaites après avoir
inversé la fiche du cordon d'alimentation. (Si nécessaire,
une prise d'adpatation non polarisée peut être utilisée
dans le but de terminer ces vérifications.)
Tous les courants mesurés ne doivent pas dépasser
0,5 mA.
VERIFICATIONS CONTRE L'INCEN-DIE ET
LE CHOC ELECTRIQUE
Dans le cas contraire, il y a une possibilité de choc
électrique qui doit être supprimée avant de rendre le
récepteur au client.
Avant de rendre le récepteur à l'utilisateur, effectuer
les vérifications suivantes.
1. Inspecter tous les faisceaux de câbles pour s'assurer
que les fils ne soient pas pincés ou qu'un outil ne soit
pas placé entre le châssis et les autres pièces
métalliques du récepteur.
2. Inspecter tous les dispositifs de protection comme les
boutons de commande non-métalliques, les isolants,
le dos du coffret, les couvercles ou blindages de réglage
VTVM
ECHELLE CA
1.5k ohm
10W
et de compartiment, les réseaux de résistance-capacité,
les isolateurs mécaniques, etc.
3. S'assurer qu'il n'y ait pas de danger d'électrocution en
vérifiant la fuite de courant, de la facon suivante:
• Brancher le cordon d'alimentation directem-ent à une
0.15 µF
SONDE D'ESSAI
prise de courant de 110-240V. (Ne pas utiliser de
transformateur d'isolation pour cet essai).
• A l'aide de deux fils à pinces, brancher une résistance
de 1.5kΩ 10 watts en parallèle av ec un condensateur
de 0,15µF en série avec toutes les pièces métalliques
exposées du coffret et une terre connue comme une
De nombreuses pièces, électriques et mécaniques, dans
les téléviseurs présentent des caractéristiques spéciales
relatives à la sécurité, qui ne sont souvent pas évidentes
à vue. Le degré de protection ne peut pas être
nécessairement augmentée en utilisant des pièces de
remplacement étalonnées pour haute tension,
puissance, etc.
Les pièces de remplacement qui présentent ces
caractéristiques sont identifiées dans ce manuel; les
pièces électriques qui présentent ces particularités sont
identifiées par la marque " å " et hachurées dans la
liste des pièces de remplacement et les diagrammes
schématiques.
Pour assurer la protection, ces pièces doivent être
identiques à celles utilisées dans le circuit d'origine.
L'utilisation de pièces qui n'ont pas les mêmes
caractéristiques que les pièces recommandées par
l'usine, indiquées dans ce manuel, peut provoquer des
électrocutions, incendies, radiations X ou autres
accidents.
3
LC-20B4U-S
LC-20B4U-B
Precautions for using lead-free solder
1 Employing lead-free solder
"All PWBs" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on
the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.
Example:
L Fa
Indicates lead-free solder of tin, silver and copper.
2 Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional
lead wire solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40°C, we recommend
you to use a dedicated soldering bit, if you are not familiar with ho w to obtain lead-free wire solder or soldering bit,
contact our service station or service branch in your area.
3 Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is about 220°C which is higher than the conventional lead
solder by 40°C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the
PWB for extended period of time. However, Since the land may be peeled off or the maximum heat-resistance
temperature of parts may be exceeded, remov e the bit from the PWB as soon as y ou confirm the steady soldering
condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on
and off the power of the bit as required.
If a different type of solder stays on the tip of the soldering bit, it is allo y ed with lead-free solder. Clean the bit after
every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
Be careful when replacing parts with polarity indication on the PWB silk.
Lead-free wire solder for servicing
Part No,★DescriptionCode
ZHNDAi123250EJφ0.3mm250g(1roll)BL
ZHNDAi126500EJφ0.6mm500g(1roll)BK
ZHNDAi12801KEJφ1.0mm1kg(1roll)BM
4
SPECIFICATIONS
LC-20B4U-S
LC-20B4U-B
Items
LCD panel19.7” Advanced Super View & BLACK TFT LCD
Number of dots921,600 dots VGA
Video color systemsN358, N443, PAL, PAL-M, PAL-N, SECAM, PAL-60
DestinationUSA/Latin America/Taiwan
TV Standard (CCIR)NTSC/PAL-M/PAL-N
TV functionTV Tuning SystemPLL 181 ch.
STEREOMTS+SAP
CATV125 ch.
Y/C FILTER3D Y/C FILTER
Brightness430 cd/m
Lamp life (Fluorescent lamp)60,000 hours
Viewing anglesH: 170° V: 170°
Audio amplifier2.5 W × 2
Speakersø2 in. (ø5 cm), 2 pcs.
HeadphoneMini-jack for stereo (ø3.5 mm)
OSD languageEnglish/French/Spanish
Power supplyDC 13V, AC 110-240V, 50/60Hz
Weight19.2 lbs. (8.7 kg), w/o accessories
AccessoriesRemote control, Battery (x2), Antenna cable, AC adapter,
Model
LC-20B4U
2
AC cord, Cable clamp (x2), Operation manual
As a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for
product improvement without prior notice. The performance specification figures indicated are nominal values of
production units. There may be some deviations from these values in individual units.
5
LC-20B4U-S
CHVOL
MENU
TV/VIDEO MAIN POWER
• TV/VIDEO, CH (
)/(
), VOL (– )/(+), and MENU on the main unit have the same functions as the same buttons
on the remote control. Basically, this operation manual provides a description based on operation with the remote
control.
MAIN POWER
TV/VIDEO
MENU
CH (
)/( )
VOL (
–
)/(+ )
Speaker (Right)
SLEEP indicator
The SLEEP indicator lights up red when the
SLEEP TIMER is set.
Upper control panel
To change the vertical
angle of the LCD TV set,
tilt the screen up to 5
degrees forward or 10
degrees backward. The
TV set can also be
rotated 25 degrees to
right and left. Adjust the
angle so that the TV set
can be watched most
comfortably.
Speaker (Left)
POWER indicator
A green indicator lights when the power is
on and a red indicator lights when in the
standby mode (the indicator will not light
when the main power is off).
Controls
Remote control sensor
V
ID
E
O
A
U
D
IO
L
Y
P
B
P
R
R
A
U
D
IO
L
R
C
O
M
P
O
N
E
N
T
A
V
-
IN
2
/O
U
T
ANT.
VIDEO
S-VIDEO
AUDIO
L
R
HEAD
PHONE
P
O
W
E
R
IN
P
U
T
D
C
1
3
V
AV-IN1
VO
L
C
H
MENUT
V/VIDEOMAINPOW
ER
U
S
E
T
H
E
S
U
P
P
L
IE
D
A
C
A
D
A
P
T
E
R
.
(
PA
RT
NO.
LOCA
TED ON
THE MODEL LABEL.
)
ANT. (Antenna terminal)
S-VIDEO
POWER INPUT
(DC13V)
P
R
AUDIO (L)
P
B
VIDEO
AUDIO (R)
AUDIO (L)
COMPONENT
AV-IN1
AUDIO (L)
AUDIO (R)
VIDEO
Y
AV-IN2/OUT
Carrying handle
Hold the carrying handle and tilt the
screen while steadying the stand with
your other hand.
Adjusting the screen view angle
Terminals
AUDIO (R)
HEADPHONE
LC-20B4U-B
OPERATION MANUAL
6
CHVOL
P
O
W
E
R
ENTER
DISPLAY
MUTE
SLEEPPIC. FLIP
BRIGHT TV/VIDEO MENU
FLASH-
BACK
1 POWER
Switch the Liquid Crystal Television power
on or off.
2 DISPLAY
Display the channel and time information.
3 SLEEP
Set the sleep timer.
4 ENTER
Execute a command.
5 BRIGHT
Adjust the brightness of the screen.
6 MUTE
Mute the sound.
7 VOL (+)/(–)
Set the volume.
8 CH (
)/(
)
Select channel.
9 MTS
Select audio settings.
10 PIC. FLIP
Set the orientation of the picture.
11
/
/
/
(Cursor control)
Select a desired item on the screen.
12 TV/VIDEO
Select a Liquid Crystal Television input
source.
13 MENU
Display the menu screen.
14 FLASHBACK
Return to the previous channel.
15 Channel Select
Set the channel.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Batteries for the Remote Control
Before using the LCD TV set for the first time, install two (“AAA” size, UM/SUM-4) batteries (supplied).
When the batteries become depleted and the remote control fails to operate, replace the batteries with
new (“AAA” size, UM/SUM-4) batteries.
1
Open the battery
cover.
2
Insert two (“AAA” size, UM/
SUM-4) batteries.
3
Close the battery
cover.
Ë Slide the cover while
pressing the (
) part.
Ë Position the positive and
negative ends of the batteries
as indicated in the compart-
ment.
+
–
+
–
Ë Engage the claw on the
cover into the battery
housing and slide shut.
LC-20B4U-S
LC-20B4U-B
7
LC-20B4U-S
LC-20B4U-B
DIMENSIONS
Unit: inch (mm)
423/64(110.7)
3(76.1)
13
(471.5)
16
/
9
18
39
35
(188)
32
/
7
(193.5)
64
/
7
(90)
64
/
3
(1)
32
/
1
15
7
CHVOLTV/VIDEOMENU MAIN POWER
1617/32(420)
51
24
/8(403.3)
/64(630)
(300.8)
32
/
27
11
(68.6)
16
/
11
2
(381.5)
64
/
1
15
3(76.1)
53
/64(249.6)
9
(470.3)
64
/
33
18
(1)
32
/
1
VIDEO
AV-IN 2/OUT
AUDIO
COMPONENT
AUDIO
(51.5)
64
/
1
2
315/16 (100)
(100)
L
16
R
/
Y
15
3
PB
R
P
L
R
S-VIDEO
USE THE SUPPLIED
AC ADAPTER.
(
PART NO. LOCATED ON
THE MODEL LABEL.
VIDEO
AV-IN1
L
AUDIO
R
HEAD
PHONE
ANT.
)
POWER
INPUT
DC12V
8
REMOVING OF MAJOR PARTS
SC3403
1. Remove the stand fixing screws (4 pcs.).
2. Remove the two terminal covers.
3. Remove the terminal section fixing screws (2 pcs.).
4. Remove the cabinet B fixing screws (12 pcs.).
5. Remove the cabinet B after opening from the direction of an arrow.
6. Remove the reinforcement angle fixing screws (4 pcs.).
7. Release the wire holder at 2 location and peel off the tape.
8. Detach the connector from each PWB.
4
Terminal Cover (S)
2
4
R
E
W
O
P
LC-20B4U-S
LC-20B4U-B
Cabinet A
N
I
A
M
O
E
D
I
V
/
V
T
U
N
E
M
H
C
L
O
V
2
7
Wire holder
7
Tape
1
8
8
SC1204SC1204
R/C, LED PWB
SC1202SC1203
Main PWB
8
8
P4004
8
P701P1201P1201
P3601
8
8
8
P8401
P2001
8
8
P4001
P3602
SC2002
P3302
P3302
Stand
8
SC3403
SC3403
Tuner PWB
P3701
P3502
P3301
8
8
P3603P3603
P3604
3
Operation PWB
8
P6705
Inverter-A
PWB
8
8
P6706
8
8
Inverter
5
Reinforcement Angle
8
8
8
-B PWB
5
Cabinet B
4
Terminal Cover (L)
6
9
LC-20B4U-S
LC-20B4U-B
9. Remove the inverter-A PWB fixing screws (2 pcs.).
10. Remove the inverter-B PWB fixing screw (1 pc.).
11. Remove the main PWB fixing screws (3 pcs.).
12. Remove the tuner PWB fixing screws (3 pcs.) and detach the chassis frame cover fixing hooks.
13. Remove the R/C, LED PWB fixing screws (2 pcs.).
14. Remove the operation PWB fixing screws (2 pcs.).
11
Chassis Frame
Main PWB
12
Tuner
PWB
Inverter-A
PWB
9
10
Inverter-B
PWB
12
Chassis Frame Cover
Operation PWB
R/C, LED PWB
13
12
LCD panel unit
14
10
» Precautions in handling the LCD panels
1. Work in a clean room (with humidities below 50%).
2. Be sure to wear an anti-static armband.
3. Handle the panels on an electro-conductive mat.
4. Be careful not to fall, shake and shock the panels.
15. Remove the LCD panel unit fixing screws (4 pcs.).
16. Remove the ITO earth spring fixing screw (1 pc.).
17. Remove the reflection/deflection, prism, diffusion, ITO sheets and diffusion panel.
18. Remove the lamp fixing holder fixing screws (6 pcs.).
19. Detach the lamp unit-A/B.
20. Remove the reflection mirror fixing screws. (6 pcs.).
Reflection Mirror
(PMiR-0296CEZZ)
Lamp Fixing Holder
(LHLDZ2176CEZZ)
Diffusion Panel
(PCOVU0107CEZZ)
LC-20B4U-S
LC-20B4U-B
Back shield
(PSLDM4685CEFW)
21
ITO Sheet
(PSHEP0289CEZZ)
Prism Sheet
(PSHEP0287CEZZ)
20" LCD Panel Unit
15
15
18
17
Diffusion Sheet
(PSHEP0288CEZZ)
Reflection/Deflection Sheet
(PSHEP0286CEZZ)
18
16
ITO Earth Spring
(MSPRP1220CEFW)
19
Lamp Unit-A
(KLMP-0124CEZZ)
Lamp Unit-B
(KLMP-0125CEZZ)
Lamp Fixing Holder
(LHLDZ2176CEZZ)
11
LC-20B4U-S
P1201
LC-20B4U-B
Precautions at the time of the side B(back) service of digital unit.
1. Remove only SC2002 of the FFC for connection between Main unit (SC2002) and Tuner unit(SC3403), and connect the extended cable (QCNW-A556WJZZ) for service.
2. Remove the FFC for connection between Main unit (SC1204) and LCD panel unit, and connect the extended
cable (QCNW-A553WJZZ) for service.
3. Remove the FFC for connection between Main unit (SC1203) and LCD panel unit, and connect the extended
cable (QCNW-A556WJZZ) for service.
4. Remove the FFC for connection between Main unit (SC1202) and LCD panel unit, and connect the extended
cable (QCNW-A555WJZZ) for service.
5. Remove the main unit fixing screws (3 pcs.), a substrate is reversed.
5
3
SC1202
2
SC1203
SC1204
P1201
4
Main PWB
P701P1201
P2001
P8401
1
SC2002
Tuner PWB
SC3403
P3701
StepPart No.Description
1QCNW-A556WJZZExtension Cable 50-pin Main (SC2002)-Tuner (SC3403)
2QCNW-A553WJZZExtension Cable 30-pin Main (SC1204)-LCD Panel
3QCNW-A556WJZZExtension Cable 50-pin Main (SC1203)-LCD Panel
4QCNW-A555WJZZExtension Cable 20-pin Main (SC1202)-LCD Panel
12
LC-20B4U-S
LC-20B4U-B
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.
1.Preparation for Adjustments
Use the exclusive-use AC adapter or stable DC power supply.
AC adapter: UADP-0243CEPZ
DC power supply: 13 ± 0.5V
2.Special mode setting procedure
(1)After initialization of E2PROM the mode is changed to the adjustment mode.
[Procedure]
Connect TP2001 and TP2002 to GND, and turn on the power.
[Description]
» The initialization of microprocessor is as follows.
» AV position, DAC data, G/A data, sound processor data, and video chroma data adjustment values are taken
as defaults.
(2)Adjustment mode
[Procedure]
Short-circuit TP2001 to GND, and turn on the power.
Or short-circuit TP2002 to GND, and turn on the power.
Or holding down the "TV/VIDEO" key and "MENU" key, turn on the main power, and simultaneously press the
(inspection process) "CH (Ù)" key and "VOL (–)" key to change the mode to the adjustment mode.
[Description]
The manual adjustment or adjustment through communication with the automatic machine is performed.
(3)Shipping setting mode
[Procedure]
Holding down the "TV/VIDEO" key and "MENU" key, turn on the main power, and simultaneously press the
(inspection process) "CH (ù)" key and "VOL (+)" key to change the mode to the shipping setting mode.
Note: Keep it in mind to turn off the power immediately. If any key-in is accidentally made, the setting will be
canceled.
[Description]
User adjustment and other values are taken as defaults.
If TV is indicated as SETTING COMPLETE, setting has been completed.
3.Cancel of special mode
Turn off the main unit power.
13
LC-20B4U-S
LC-20B4U-B
4.Adjustments
AdjustmentAdjusting conditionsAdjusting method
1B+ Adjustment
(R3714)
2Inch Size setup
(If E2PROM is replaced)
(IC2010)
3Common-bias adjustment
4TAMP adjustment
1. Connect the DC voltmeter to
pin (4) of P3701.
1. Go to the adjustment mode.
1. Receive a B/W channel.
2. Go to the adjustment mode.
3. Select the "COM BIAS" with
[MENU] key.
1. Receive a half color bar signal in the
TV mode so that the top left zone
should turn white 75% as shown below. Other signal can be fed instead
of the half color bar signal, howev er,
if the point at the vertical 180th line
and horizontal 46th pixel is of white
75%. (Make the adjustment based
on the setting of this point.)
1. Adjust the "B+ Adj" value to
5.0±0.02V with R3714. Make exact
adjustment of the 5.00V level because it will be the reference for all
the other supply voltages. Be sure to
make this adjustment together with
the main PWB (digital PWB). During
the adjustment, be also careful not
to allow the voltage at pin (2) of
P3701 to go above 5.3 V.
1. Select "INCH SIZE" and adjust to
"20" with "VOL (+)" or "VOL (–)" key.
* The color of "INCH SIZE" must be
yellow.
1. Adjust "COM BIAS" to the darkest
screen with "VOL (+)" and "VOL (–)"
key.
* The color of "COM BIAS" must be
yellow.
White 75% at
top left zone
Vertical 180th line and
horizontal 46th pixel
640 pixels
480 lines
2. Adjust the "NTSC TAMP" setting on
page 2 of adjustment process mode
so that the "Y" reading on the same
page should be 187 - 202.
3. Make the same setting for the PALM TAMP and PAL-N TAMP data.
14
2
COM BIAS118
TAMP L187
TDATA–
TAMP H202
NTSC T AMP20
P AL-M TAMP20
P AL-N TAMP20
Red cut-off adjustment
Green cut-off adjustment
Blue cut-off adjustment
White balance
White balance
White balance
Red cut-off adjustment (D2)
Green cut-off adjustment (D2)
Blue cut-off adjustment (D2)
White balance (D2)
White balance (D2)
White balance (D2)
LC-20B4U-S
LC-20B4U-B
5White balance adjustment
6Checking and modifying
the settings adjustment
(If E2PROM is replaced)
1. The upper six items are for other than
D2, whereas the lower six are for D2.
When any of the upper six settings
has been modified, the equivalent
item in the lower six has the same
setting. Now the D2 settings can be
finely readjusted.
Go to the adjustment mode and
check the following settings.
DVD NTSC CB
DVD NTSC TINT
DVD NTSC BRIGHTNESS
DVD NTSC CONTRAST
DVD PAL CR
DVD PAL CB
DVD PAL TINT
DVD PAL BRIGHTNESS
DVD PAL CONTRAST
N358 BRIGHTNESS
N358 AV CTI7D
PAL-M BRIGHTNESS
PAL-N BRIGHTNESS
PAL BRIGHTNESS
SECAM BRIGHTNESS
PAL60 BRIGHTNESS
N443 BRIGHTNESS
D2 BRIGHTNESS
HPRESC FIL42
D2 RGB CON
OSD setting
40 → 35
40 → 35
5 → 1
60 → 68
30 → 28
40 → 35
40 → 35
7 → 1
60 → 68
30 → 28
0 → -2
153 → 57
0 → -2
0 → -2
0 → -2
0 → -2
0 → -2
0 → -2
5 → -11
0 → 48
29 → 33
See if all the settings are as specified. If not, select an item in question
with "VOL (+)" or "VOL (–)" key and
adjust the setting as shown at left.
* An item selected will be highlighted
in yellow.
15
LC-20B4U-S
LC-20B4U-B
AdjustmentAdjusting conditionsAdjusting method
7E2PROM data write
1. Call up the adjustment process menu
and get Page 6 displa y ed on-screen.
2. Enter "A40000002681 " for the "I
DATA" item in Line 1.
If the wrong data has been sent:
1. Initialize the E2PROM. (Take the
2
C
special mode setting procedure (1).)
2. Take the adjustment steps 2 thru 7.
3. Move the cursor to the "I2C DATA"
item in Line 2 and carry out "SEND"
with the right cursor key.
5.Shipping setting list
EZ SETUP AUTO START .............................................................................................. ON
LANGUAGE .................................................................................................................... ENGLISH
LAST CHANNEL............................................................................................................. 2ch
LAST TV/INPUT ............................................................................................................. TV
LAST AIR/CATV ............................................................................................................. AIR
SKIP DATA_CATV ......................................................................................................... ALL SKIP
SKIP DATA_AIR ............................................................................................................. ALL SKIP
TIME ..........................................................................................................................12:00AM
DST............................................................................................................................ OFF
16
Test patterns in adjustment process mode
[1] IC801 (Video decoder) test patterns
1-1. Getting the test patterns displayed
Put the screen in AV1, AV2 or COMPONENT but keep out any signal. Call the adjustment process mode,
select "TEST PATTERN" in the 3rd line of VPC 1, make the settings 1 thru 6, and the following test patterns
show up.
1-2. Test patterns
» Setting 1
The color bars are displayed as shown at left.
LC-20B4U-S
LC-20B4U-B
Yellow
Green
Cyan
Magenta
Green
Red
Blue
greengreen
Yellow
» Setting 2
Finer vertical stripes than Setting 1 are displayed.
» Setting 3
Green
BrightBrightDark
» Setting 4
A rather dark green-only pattern is displayed.
» Setting 5
A half-tone green-only pattern is displayed.
» Setting 6
A rather bright green-only pattern is displayed.
[2] IC1201 (LCD controller) test pattern
2-1. Getting the test pattern displayed
Put the screen in AV1, AV2 or COMPONENT but keep out any signal. Call the adjustment process mode,
select "TEST PATTERN" in the 3rd line of DPS 1, turn on the setting, and the follo wing test pattern shows up.
2-2. Test pattern
The following test pattern appears.
Cyan
Magenta
The green pattern is displayed as shown at left.
DarkDark
DarkRed
Dark
Dark
BlackGrayWhite
Gray scaleBright
Green
Blue
Gradation
Bright
Bright
Bright
Dark
Dark
Dark
Note: When the IC801 and IC1201 test pattern displa y commands are both turned on at the same time, the IC1201
test pattern is given priority.
17
LC-20B4U-S
LC-20B4U-B
Pin functions of microprocessor IC (IC2001) RH-iXA620WJZZQ
In Power Saving*
Pin No.Name of TerminalI/OName of FunctionFunction in Normal Times
1VHOLD1IVholdFor CLOSED CAPTION
2HLF1I/OHLFFor CLOSED CAPTION
3P94/DA1/SCL3/RXD2OLN.C.
4P93/DA0/SDA3/TXD2OLTIMELEDFor LED lighting in timer operation
5P92/TB2IN/DIGR0OLN.C.
6P91/TB1INIHi-ZCSYNCComposite sync signal
7P90/TB0INIHi-ZIREM1Remote control
8BYTEOBYTEGND
9CNVSSOCNVssGND ("H" at the time of flash writing)
10P87/XCIN/DIGG0IXcin32 kHz oscillation input
11P86/XCOUTDIGB0OXout32 kHz oscillation output
12RESETIRESETReset state at "L"
13XOUTOXoutMicroprocessor oscillator connection
14VSSIVssGND
15XINIXinMicrocomputer oscillator connection
16VCCIIVcclPower supply (3.3 V)
17OSC1/OSCHLFIOSCinClock input for OSD
18OSC2ON.C.
19P83/INT1IHi-ZPSWin
20P82/INT0OLN.C.
21OUT1OLBLKOSD blanking output
22OUT2OLNot Used
23P77/HC1OLDAC1CSGray scale control IC chip selection
24P76/TA3OUTOLN.C.
25P75/HC0OLN.C.
26P74/TA2OUTOLN.C.
27P73/CTS2, RTS2IHi-ZMRDYI2C bus open connection selection input
28P72/SCL2/CLK2I/OHi-ZSCL2I2C bus serial clock line 2 (EEPROM)
29P71/SCL1/RXD2I/OHi-ZSCL1
30P70/SDA1/TXD2I/OHi-ZSDA1I2C bus serial data line 1
31P67/SDA2I/OHi-ZSDA2I2C bus serial data line 2
32R/DIGR1OLOSD_RR signal output of OSD
33G/DIGG1OLOSD_GG signal output of OSD
34B/DIGB1OLOSD_BB signal output of OSD
35P63/TXD0OSUBDout(T x D at flash WRITE)
36P62/RXD0ISUBDin(R x D at flash WRITE)
37P61/CLK0ISCLKClock input at flash WRITE
38P60/CTS0/RTS0OBUSYBusy output at flash WRITE
39P57/RDY/CLKOUTOMAIN SW
40P56/ALEOLN.C.
41P55/HOLDIEPM"L" at flash WRITE
42P54/HLDAIHi-ZL_ERR
43P53/BCLKOLS IN/OUTAudio input/output selection (Audio output at "L")
44P52/RDOLPC/VD
45P51/WRH/BHEOLN.C.
46P50/WRL/WRICE"H" at flash WRITE
47P47/CS3OLAV1/AV2AV selector SW
48P46/CS2OLTV/AVAV selector SW
49P45/CS1OLN.C.
50P44/CS0OLVSHOUTPanel gate driver voltage control
* Except for AUTO CLOCK being in operation when the power is OFF
Within 1 min. after
Power-OFF by R/C Unit
Power supply monitor ("L" at the time of power-ON)
I2C bus serial clock line 1 (UV TUNER, VPC, MSP, 3D YC, DPS)
Main SW ON "H"/OFF "L" (LED power supply control)
Fluorescent lamp error detection processing (Error at "H")
D2 (& PC) mode selection (D2 or PC mode at "L")
18
LC-20B4U-S
LC-20B4U-B
In Power Saving*
Pin No.Name of TerminalI/OName of FunctionFunction in Normal Times
Within 1 min. after
Power-OFF by R/C Unit
51P43/A19OLREQAdjusting process
52P42/A18OLLED_POW
Green by TV power supply LED control at "H", and red at "L"
53P41/A17OLSP MUTE 1Main speaker MUTE
54P40/A16OLCVBS/YCVBS/Y selection (AV selector SW)
55P37/A15IHi-ZHP DETHeadphone detection (Headphone at "L")
56P36/A14OLSSTBYSpeaker standby ("L" at standby)
57P35/A13IHi-ZVSH IN
Panel gate driver voltage check (Standby maintained at "H")
58P34/A12OLLMUTELine-out audio MUTE (Audio output MUTE at "H")
59P33/A11OLV IN/OUTImage input/output selection (Image output at "L")
60P32/A10OLSRESET"L" output at multi-Sound IC (MSP) reset
61P31/A9OLN.C.
62HSYNCIHSYNCHorizontal sync signal for OSD
63P30/A8OLN.C.
64VSYNCIVSYNCVertical sync signal for OSD
65P27/A7OLN.C.
66P26/A6OLN.C.
67P25/A5OLN.C.
68P24/A4OLN.C.
69P23/A3OLN.C.
70P22/A2OLN.C.
71P21/A1OLN.C.
72P20/A0OLPOWoutDC/DC control output
73P17/D15IHi-ZADPPOWAdaptor ON/OFF input
74P01/D1OLDACOUTCON
Gray scale control IC for output control (Output at "H")
75P15/D13OLN.C.
76P14/D12OLN.C.
77P13/D11OLN.C.
78P12/D10OLMP_DAGray scale control IC for data output
79P11/D9OLMP_CLKGray scale control IC for clock output
80P10/D8OLDDC_RESET"L" output at VPC, G/A, 3DY/C, DPS reset
81P07/D7IHi-ZKEY4Key input 4
82P06/D6IHi-ZKEY5Key input 5
83P05/D5OLN.C.
84P04/D4OLN.C.
85P03/D3OLN.C.
86P02/D2OLN.C.
87P01/D1IHi-ZPOWinDC/DC start detection (Detection at "H")
88P00/D0IHi-ZSSWS terminal by S terminal connection at "L"
89P107/AN5/DIGR2IHi-ZAFTAFT voltage input
90P106/AN4/DIGG2IHi-ZAGCAGC input voltage
91P105/AN3/DIGB2IHi-ZKEY1Key input 1
92P104/AN2IHi-ZKEY2Key input 2
93P103/AN1IHi-ZSLOW SW
94P102/AN0OLN.C.
95VHOLD2IV HOLD2For CLOSED CAPTION
96HLF2I/OHLF2For CLOSED CAPTION
97CVIN2ICVin2For CLOSED CAPTION
98TVSETBITVSETBFor CLOSED CAPTION (For test, L fixed)
99VCCEIVccEPower supply (5V)
100CVIN1ICVin1For CLOSED CAPTION
* Except for AUTO CLOCK being in operation when the power is OFF
19
LC-20B4U-S
LC-20B4U-B
Table of Adjusting Process Defaults
1000 order
Title No. Page No.
01MODELA620←
02COM BIAS1100255Decimal
03RCUTOFF0-6363 +/- decimal
100 and 10 orders
INCH SIZE20→13/15/20
ERROR NO RESET005Decimal
PUBLIC MODEOFF→ON/OFF
V-CHIP1→1/2
CANADIAN VCHIPOFF→ON/OFF
EXT CONTROLOFF→ON/OFF
VPC SHARPNESSON→ON/OFF
EDS data captured is displayed at the top.
ROM and GAIBU version No. are displayed at the bottom.
ItemInitial Values Min. Value Max. ValueDisplayContent
Selection of model name (For prevention of malfunction, it is
impossible to change it.)
Selection of screen size (inch)
Lamp error count and reset
Hotel mode setting
VCHIP line MUTE setting
Setting for responding to CANADIAN VCHIP
Bus, UART opening ON/OFF (OSD display is not changed.)
Adjustment or no adjustment of SHARPNESS by VPC (No effect by D2)
Opposed bias adjustment
Setting Y lower limit value in TAMP adjustment
Data READ value in TAMP adjustment
Setting Y upper limit value in TAMP adjustment
TAMP adjustment
TAMP adjustment
TAMP adjustment
Red cut-off adjustment
Green cut-off adjustment
Blue cut-off adjustment
White balance
White balance
White balance
Red cut-off adjustment (D2)
Green cut-off adjustment (D2)
Blue cut-off adjustment (D2)
White balance (D2)
White balance (D2)
White balance (D2)
I
Execution of WRITE and READ
Goes to SOUND adjustment page.
Goes to VPC adjustment page.
Goes to DPS adjustment page.
Goes to DAC adjustment page.
Goes to TUNER adjustment page.
Goes to other adjustment page.
Volume
AVC setting
Sound IC MSP data WRITE and READ
Execution of WRITE and READ
Sound output setting without TV sync
For sound test
Image IC VPC data WRITE and READ
Execution of WRITE and READ
VPC test pattern selection
Line lock mode selection
Horizontal position setting (at N358)
Horizontal position setting (at other than N358)
Chroma band pass setting (at N358)
Chroma band pass setting (at other than N358)
Y/C phase setting
Measures against up/down bound
N358 SFIF004095Decimal
N358 SCINC1163510244095Decimal
N358 AV LDLY0-71 +/- decimal
N358 TV LDL Y0-71 +/- decimal
N358 PEAKING FILTER
N358 TV H-PEAKING
N358 AV H-PEAKING
N358 TV CORING101Decimal
N358 AV CORING101Decimal
2VPC4N358 TV CONTRAST48063Decimal
N358 AV CONTRAST48063Decimal
N358 TV COLOR207004094Decimal
N358 AV COLOR207004094Decimal
N358 TV TINT-10-512512 +/- decimal
N358 AV TINT-10-512512 +/- decimal
N358 BRIGHTNESS16-128127 +/- decimal
002Decimal
207Decimal
207Decimal
COM filter setting
COM filter setting
COM filter setting
COM filter setting
COM filter setting
Color killer level setting
Color killer hysteresis setting
V sync phase setting (in normal times)
V sync phase setting (at 480P)
DVCO setting (in normal times)
DVCO setting (at 480P)
PAL -M SF IF004095Decimal
PAL-M SCINC1163510244095Decimal
PAL-M AV LDLY0-71 +/- decimal
PAL-M TV LDLY0-71 +/- decimal
PAL-M PEAKING FILTER
P AL-M TV H-PEAKING
PAL-M AV H-PEAKING
P AL-M TV CORIMGf101Decimal
PAL-M AV CORING101Decimal
P AL-M TV CONTRAST
PAL-M AV CONTRAST
P AL-M TV COLOR207004094Decimal
PAL-M AV COLOR207004094Decimal
PAL-M TV TINT0-512512 +/- decimal
PAL-M AV TINT0-512512 +/- decimal
PAL-M BRIGHTNESS
PAL-N SFIF004095Decimal
PAL-N SCINC1163510244095Decimal
PAL-N AV LDLY0-71 +/- decimal
PAL-N TV LDLY0-71 +/- decimal
PAL-N PEAKING FILTER
P AL-N TV H-PEAKING
PAL-N AV H-PEAKING
P AL-N TV CORING101Decimal
PAL-N AV CORING101Decimal
ItemInitial Values Min. Value Max. ValueDisplayContent
PAL-N TV CONTRAST
PAL-N AV CONTRAST
P AL-N TV COLOR207004094Decimal
PAL-N AV COLOR207004094Decimal
P AL-N TV TINT0-512512 +/- decimal
PAL-N AV TINT0-512512 +/- decimal
PAL-N BRIGHTNESS
PAL SFIF004095Decimal
PAL SCINC1163510244095Decimal
PAL AV LDLY0-71 +/- decimal
PAL PEAKING FILTER
PAL AV H-PEAKING207Decimal
PAL AV CORING101Decimal
PAL AV COLOR207004094Decimal
PAL AV TINT0-512512 +/- decimal
PAL BRIGHTNESS16-128127 +/- decimal
SECAM SFIF004095Decimal
SECAM SCINC1163510244095Decimal
SECAM AV LDLY0-71 +/- decimal
SECAM PEAKING FILTER
SECAM AV H-PEAKING
SECAM AV CORING101Decimal
DVD NTSC CB40063Decimal
DVD NTSC TINT5-3131Decimal
DVD NTSC BRIGHTNESS
DVD NTSC BRIGHT216-128127Decimal
DVD NTSC CONTRAST
DVD NTSC CONTRAST2
DVD NTSC P FILTER002Decimal
DVD NTSC H-PEAKING
DVD NTSC CORING101Decimal
2VPC18DVD PAL CR40063Decimal
DVD PAL CB40063Decimal
DVD PAL TINT7-3131Decimal
DVD PAL BRIGHTNESS
DVD PAL BRIGHT216-128127Decimal
DVD PAL CONTRAST30063Decimal
DVD PAL CONTRAST2
DVD PAL P FILTER002Decimal
DVD PAL H-PEAKING
DVD PAL CORING101Decimal
3DPS1DPS DATA0–––
DPS DATAWAIT–––
DPS TESTPOFF→ON/OFF
N358 TVCOLOR40063Decimal
N358 AV COLOR40063Decimal
N358 TV TINT3-3231 +/- decimal
N358 AV TINT3-3231 +/- decimal
N358 BRIGHTNESS0-256255 +/- decimal
N358 TV CONTRAST
N358 AV CONTRAST50063Decimal
DPS data WRITE and READ
Execution of WRITE and READ
DPS test pattern select
Changes to DPS control (h’88 [5:0])
Changes to DPS control (h’88 [5:0])
Changes to DPS control (h’89 [5:0])
Changes to DPS control (h’89 [5:0])
Changes to DPS control (h’8A [7:0], h’8B [6])
Changes to DPS control (h’8B [5:0])
Changes to DPS control (h’8B [5:0])
23
LC-20B4U-S
LC-20B4U-B
1000 order
Title No. Page No.
3DPS2N358 TV PKLEVEL7015Decimal
3DPS3N358 TV LTI1430255Decimal
3DPS4N358 TV BLEMODE303Decimal
100 and 10 orders
N358 AV PKLEVEL7015Decimal
N358 TV PKCORRED7A
N358 AV PKCORRED7A
N358 TV PKCFSOFT7C
N358 AV PKCFSOFT7C
N358 VST AR T13501023Decimal
N358 VSTOP13601023Decimal
N358 HSDEL00511Decimal
N358 AV LTI1430255Decimal
N358 TV LMODE79670255Decimal
N358 AV LMODE79670255Decimal
N358 TV LMIX78790127Decimal
N358 AV LMIX78790127Decimal
N358 TV CTI7D1530255Decimal
N358 AV CTI7D1530255Decimal
N358 TV CTIBWLP7C
N358 AV CTIBWLP7C
N358 AV BLEMODE303Decimal
N358 TV BGAINREF71
N358 AV BGAINREF71
N358 TV POINT72210127Decimal
N358 AV POINT72210127Decimal
N358 TV MINFIL73710127Decimal
N358 AV MINFIL73710127Decimal
N358 TV CROP7015Decimal
N358 AV CR OP7015Decimal
ItemInitial Values Min. Value Max. ValueDisplayContent
PAL-M AV COLOR40063Decimal
PAL-M TV TINT0-3231 +/- decimal
PAL-M AV TINT0-3231 +/- decimal
PAL-M BRIGHTNESS
P AL-M TV CONTRAST
PAL-M AV CONTRAST
PAL-M AV PKLEVEL7015Decimal
PAL-M TV PKCORRED7A
PAL-M AV PKCORRED7A
PAL-M TV PKCFSOFT7C
PAL-M AV PKCFSOFT7C
PAL-M VSTART13501023Decimal
PAL-M VSTOP13601023Decimal
PAL-M HSDEL00511Decimal
Changes to DPS control (’88[5:0])
Changes to DPS control (’88[5:0])
Changes to DPS control (’89[5:0])
Changes to DPS control (’89[5:0])
Changes to DPS control (’8A[7:0],h’8B[6])
Changes to DPS control (’8B[5:0])
Changes to DPS control (’8B[5:0])
PAL-M AV LTI1430255Decimal
P AL-M TV LMODE79670255Decimal
PAL-M AV LMODE79670255Decimal
P AL-M TV LMIX78790127Decimal
PAL-M AV LMIX78790127Decimal
P AL-M TV CTI7D1530255Decimal
PAL-M AV CTI7D1530255Decimal
P AL-M TV CTIBWLP7C
PAL-M AV CTIBWLP7C
PAL-M AV BLEMODE303Decimal
P AL-M TV BGAINREF71
PAL-M AV BGAINREF71
P AL-M TV POINT72210127Decimal
PAL-M AV POINT72210127Decimal
P AL-M TV MINFIL73710127Decimal
PAL-M AV MINFIL73710127Decimal
PAL-M TV CROP7015Decimal
PAL-M AV CROP7015Decimal
PAL-M HPRESC FIL42
PAL-M HSCPRESC004095Decimal
PAL-M HPOSC UPSF60
PAL-M HSCPOSC404704095Decimal
P AL-M VSCPOSC 4E610255Decimal
P AL-M VSCPOSC 4F90255Decimal
P AL-M VSCPOSC 5000255Decimal
P AL-M V OFPOSC0025 5Decimal
P AL-M VPOSC UPSF60
PAL-M PPLOP82304095Decimal
PAL-M PPLOP REF.Display only
ItemInitial Values Min. Value Max. ValueDisplayContent
PAL-N AV COLOR40063Decimal
P AL-N TV TINT0-3231 +/- decimal
PAL-N AV TINT0-3231 +/- decimal
PAL-N BRIGHTNESS
P AL-N TV CONTRAST
PAL-N AV CONTRAST
3DPS12PAL-N TV PKLEVEL7015Decimal
PAL-N AV PKLEVEL7015Decimal
P AL-N TV PKCORRED7A
PAL-N AV PKCORRED7A
P AL-N TV PKCFSOFT7C
PAL-N AV PKCFSOFT7C
PAL-N VSTART14101023Decimal
P AL-N VSTOP14201023Decimal
PAL-N HSDEL00511Decimal
3DPS13P AL-N TV LTI1430255Decimal
PAL-N AV LTI1430255Decimal
P AL-N TV LMODE79670255Decimal
PAL-N AV LMODE79670255Decimal
P AL-N TV LMIX78790127Decimal
PAL-N AV LMIX78790127Decimal
P AL-N TV CTI7D1530255Decimal
PAL-N AV CTI7D1530255Decimal
P AL-N TV CTIBWLP7C
PAL-N AV CTIBWLP7C
0-256255 +/- decimal
50063Decimal
50063Decimal
1910255Decimal
1910255Decimal
407Decimal
407Decimal
003Decimal
003Decimal
Changes to DPS control (h’88[5:0])
Changes to DPS control (h’88[5:0])
Changes to DPS control (h’89[5:0])
Changes to DPS control (h’89[5:0])
Changes to DPS control (h’8A[7:0],h’8B[6])
Changes to DPS control (h’8B[5:0])
Changes to DPS control (h’8B[5:0])
PAL-N AV BLEMODE303Decimal
P AL-N TV BGAINREF71
PAL-N AV BGAINREF71
P AL-N TV POINT72210127Decimal
PAL-N AV POINT72210127Decimal
P AL-N TV MINFIL73710127Decimal
PAL-N AV MINFIL73710127Decimal
PAL-N TV CROP7015Decimal
PAL-N AV CROP7015Decimal
PAL-N HPRESC FIL42
PAL-N HSCPRESC004095Decimal
PAL-N HPOSC UPSF60
PAL-N HSCPOSC400004095Decimal
P AL-N VSCPOSC 4E360255Decimal
P AL-N VSCPOSC 4F360255Decimal
P AL-N VSCPOSC 5000255Decimal
PAL-N VOFPOSC0025 5Decimal
PAL-N VPOSC UPSF60
PAL-N PPLOP97504095Decimal
PAL-N PPLOP REF.Display only
PAL AV TINT0-3231 +/- decimal
PAL BRIGHTNESS0-256255 +/- decimal
PAL AV CONTRAST50063Decimal
ItemInitial Values Min. Value Max. ValueDisplayContent
Changes to DPS control (h’88[5:0])
Changes to DPS control (h’89[5:0])
Changes to DPS control (h’8A[7:0],h’8B[6])
Changes to DPS control (h’8B[5:0])
3DPS17PAL AV PKLEVEL7015Decimal
PAL AV PKCORRED7A
PAL AV PKCFSOFT7C
PAL VSTART14101023Decimal
P AL VST OP14201023Decimal
PAL HSDEL00511Decimal
3DPS18PAL AV L TI1430255Decimal
PAL AV LMODE79670255Decimal
PAL AV LMIX78790127Decimal
PAL AV CTI7D1530255Decimal
PAL AV CTIBWLP7C003Decimal
3DPS19PAL AV BLEMODE303Decimal
PAL AV BGAINREF71
PAL AV POINT72210127Decimal
PAL AV MINFIL73710127Decimal
PAL AV CROP7015Decimal
3DPS20PAL HPRESC FIL420063Decimal
PAL HSCPRESC004095Decimal
PAL HPOSC UPSF60003Decimal
PAL HSCPOSC400004095Decimal
P AL VSCPOSC 4E360255Decimal
P AL VSCPOSC 4F360255Decimal
P AL VSCPOSC 5000255Decimal
PAL VOFPOSC00255Decimal
P AL VPOSC UPSF60003Decimal
PAL PPLOP97504095Decimal
PAL PPLOP REF.Display only
PAL NALPF80255Decimal
PAL NALPFOP3304095Decimal
PAL ALPFOP48804095Decimal
PAL OSD VB4101023Decimal
PAL OSD VE4201023Decimal
PAL APPL32401023Decimal
PAL NAPPH003Decimal
PAL HSPPL510255Decimal
PAL VSLPF00127Decimal
AFT voltage standard value
AFT voltage standard value
Sync judgment threshold value (TV)
Sync judgment threshold value (TV)
Sync judgment threshold value (External input)
Last sync judgment frequency in AIR CH SEARCH
Display/No display of component system selection
Time (Seconds) required until judgment results in that no
EDS time data is available.
30
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