Sharp LC-37DB5U User manual

LC-37DB5U
SERVICE MANUAL
LCD COLORTELEVISION
MODEL LC-37DB5U
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 Page
»LIST OF CHANGED PARTS ...........................................................................................................................2
»IMPORTANT SERVICE SAFETY PRECAUTION ........................................................................................3
»SPECIFICATIONS........................................................................................................................................6
»OPERATION MANUAL ................................................................................................................................7
»DIMENSIONS ............................................................................................................................................13
»REMOVING OF MAJOR PARTS................................................................................................................14
»BLOCK DIAGRAM .....................................................................................................................................18
»OVERALL WIRING DIAGRAM...................................................................................................................20
»PARTS LIST ...............................................................................................................................................22
»PACKING OF THE SET .............................................................................................................................26
OUTLINE
This model is based on the LC-37D4U and is equipped with a redesigned speaker, and is changed some
function. This Service Manual covers the modifications alone. For the other points, refer to the LC-26/32/
37D4U Service Manual.
S95N9LC37DB5U
SHARP CORPORATION This document has been published to be used for
after sales service only.
The contents are subject to change without notice.

2
LC-37DB5U
LIST OF CHANGED PARTS
LC-37D4U → LC-37DB5U
Ref.No. Description LC-37D4U LC-37DB5U Note
PWB ASSEMBLIES
DIGITAL Unit DUNTKD331FE14 DUNTKD331FE16 *Some parts changed
AV Unit DUNTKD352DE19 DUNTKD352WE03 *Some parts changed
KEY Unit DUNTKD353DE19 DUNTKD353WE01 No parts changed
R/C, LED Unit DUNTKD354DE19 DUNTKD354WE01 *Some parts changed
MAIN Unit DUNTKD376FE06 DUNTKD376FM07 No parts changed
POWER Unit RDENCA140WJQZ 
LCD PANEL
37 WIDE LCD PANEL MODULE Unit RLCUCA026WJZZ 
AV Unit
R3926 Metal Oxide VRS-CY1JF222JY VRS-CY1JF102JY *Change
R3930 Metal Oxide VRS-CY1JF682JY VRS-CY1JF102JY *Change
These parts is deleted from “LC-37D4U”. *Delete
Q1110, L1103, C1110, C1113, R1114, R1118, UNT1101
R/C, LED Unit
D103 Diode RH-PXA087WJZZY RH-PXA089WJZZY *Change
R108 Metal Oxide VRS-CY1JF911JY VRS-CY1JF561JY *Change
DIGITAL Unit
R8106 Metal Oxide VRS-CZ1JF000JY VRS-CZ1JF470JY *Change
R8107 Metal Oxide VRS-CH1JF000JY VRS-CH1JF470JY *Change
R8125 Metal Oxide VRS-CH1JF103JY VRS-CH1JF470JY *Change
R8164 Metal Oxide VRS-CZ1JF000JY VRS-CZ1JF470JY *Change
R8198 Metal Oxide VRS-CZ1JF103JY VRS-CZ1JF470JY *Change
R8208 Metal Oxide  VRS-CZ1JF103JY *Add
R8209 Metal Oxide  VRS-CZ1JF103JY *Add
R9537 Metal Oxide VRS-CH1JF470JY VRS-CH1JF000JY *Change
R9538 Metal Oxide VRS-CH1JF470JY VRS-CH1JF000JY *Change
R9539 Metal Oxide  VRS-CZ1JF000JY *Add
These parts is deleted from “LC-37D4U”. *Delete
CABINET AND MECHANICAL PARTS
Please refer to a Parts list.
PACKING PARTS AND ACCESSORIES
Please refer to a Parts list.
IC8051, IC8052, IC9402, IC9403, IC9405, IC9501, IC9502, IC9503, IC9701, IC9702, D9701, D9702, D9703,
FL8051, L8051, L8052, L8053, L8054, L8055, L8056, L8057, L8058, L8059, L8060, L8061, L9702, L9703,
C8051, C8052, C8053, C8054, C8055, C8056, C8057, C8058, C8059, C8060, C8061, C8062, C8063, C8064,
C8065, C8066, C8067, C8068, C8069, C8070, C8071, C8072, C8073, C8074, C8075, C8076, C8077, C8078,
C8079, C8080, C8081, C8082, C8083, C8084, C8085, C8086, C8087, C9404, C9405, C9406, C9407, C9408,
C9409, C9410, C9411, C9413, C9417, C9501, C9502, C9503, C9504, C9505, C9506, C9507, C9508, C9509,
C9510, C9511, C9512, C9513, C9514, C9515, C9516, C9517, C9518, C9701, C9702, C9703, C9704, C9705,
C9706, C9707, C9708, C9709, C9711, C9714, R8051, R8052, R8053, R8054, R8056, R8057, R8101, R8105,
R8112, R8117, R8124, R8132, R8414, R8415, R9124, R9125, R9126, R9401, R9402, R9403, R9404, R9405,
R9407, R9408, R9409, R9410, R9411, R9413, R9414, R9418, R9501, R9502, R9503, R9504, R9505, R9507,
R9509, R9511, R9513, R9515, R9517, R9519, R9521, R9523, R9524, R9525, R9526, R9527, R9528, R9701,
R9702, R9704, R9705, R9706, R9710, R9711, FB9401, FB9402, FB9403, FB9701, J8052, SC9401, SC9501,
LUG9401, LUG9402

3
LC-37DB5U
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SAFETY NOTICE
Many electrical and mechanical parts in LCD color
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
components having such features are identified by " å"
and shaded areas in the Replacement Parts List and
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.
CAUTION: FOR CONTINUED PROTECTION
AGAINST A RISK OF FIRE REPLACE ONLY WITH
SAMETYPE FUSE.
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
BEFORE RETURNINGTHE 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 120 volt AC outlet.
»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 having with 5000 ohm per volt,
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 0.75 Vrms (this corresponds to 0.5
mA rms AC.) or more is excessive and indicates a
potential shock hazard which must be corrected
before returning the monitor to the owner.
IMPORTANT SERVICE SAFETY PRECAUTION
ËService work should be performed only by qualified service technicians who are thor-
oughly familiar with all safety checks and the servicing guidelines which follow:
DVM
AC SCALE
1.5k ohm
10W
TO EXPOSED
METAL PARTS CONNECT TO KNOWN EARTH
GROUND
0.15 µF
TEST PROBE
F701, F702 (5A, 250V)
F703 (1A, AC250V), F704 (117°C, 2A)

4
LC-37DB5U
PRECAUTION:POUR LA PROTECTION CONTINUE
CONTRELESRISQUESD'INCENDIE,REMPLACER
LE FUSIBLE
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AVIS POUR LA SECURITE
De nombreuses pièces, électriques et mécaniques,
dans les téléviseur ACL présentent des caractéristiques
spéciales relatives àla sécurité, qui ne sont souvent
pas évidentes àvue. Le degréde 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
PRECAUTIONS A PRENDRE LORS DE LA REPARATION
ËNe peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement
accoutumé à toute vérification de sécurité et aux conseils suivants.
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 àcelles 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.
AVERTISSEMENT
1. N'entreprendre aucune modification de tout circuit.
C'est dangereux.
2. Débrancher le récepteur avant toute réparation.
VERIFICATIONS CONTRE L'INCEN-DIE ET
LE CHOC ELECTRIQUE
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 placéentre 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,
ledosducoffret,lescouverclesoublindagesde réglage
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 àune
prise de courant de 120V. (Ne pas utiliser de
transformateur d'isolation pour cet essai).
•A l'aide de deux fils àpinces, brancher une résistance
de 1.5 kΩ10 watts en parallèle avec un condensateur
de 0.15µF en série avec toutes les pièces métalliques
exposées du coffret et une terre connue comme une
conduite électrique ou une prise de terre branchée à
la terre.
•Utiliser un voltmètre CA d'une sensibilitéd'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
inverséla 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.
Dans le cas contraire, il y a une possibilitéde choc
électrique qui doit être supprimée avant de rendre le
récepteur au client.
DVM
ECHELLE CA
1.5k ohm
10W
0.15 µF
SONDE D'ESSAI
AUX PIECES
METALLIQUES
EXPOSEES
BRANCHER A UNE
TERRE CONNUE
F701, F702 (5A, 250V)
F703 (1A, AC250V), F704 (117°C, 2A)

5
LC-37DB5U
Precautions for using lead-free solder
1 Employing lead-free solder
"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:
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 how 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, remove the bit from the PWB as soon as you 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 alloyed 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.
Indicates lead-free solder of tin, silver and copper.
Lead-free wire solder for servicing
Part No, ★Description Code
ZHNDAi123250E J φ0.3mm 250g(1roll) BL
ZHNDAi126500E J φ0.6mm 500g(1roll) BK
ZHNDAi12801KE J φ1.0mm 1kg(1roll) BM
LFa

6
LC-37DB5U
SPECIFICATIONS
Item 37"LIQUID CRYSTAL TELEVISION,
Model: LC-37DB5U
TV
Function
American TV Standard ATSC/NTSC System
VHF/UHF VHF 2-13ch, UHF 14-69ch
CATV 1-125ch
Audio multiplex BTSC System
Terminals AV in, COMPONENT in
INPUT 2 AV in, COMPONENT in
INPUT 4 Audio in, HDMI in with HDCP
INPUT 3 S-VIDEO in, AV in
OSD language English/French/Spanish
Power Requirement AC 120 V, 60 Hz (FOR NORTH AMERICA)
AC 110-240 V, 50/60 Hz(FOR OTHERS)
Power Consumption
Weight
Accessories Operation manual ( 1), Remote control unit ( 1), AC cord ( 1), " AAA" size
battery ( 2), Cable clamp ( 1), Cable tie ( 1)
TV-standard (CCIR)
Receiving
Channel
Rear INPUT 1
As 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.
LCD panel 37" Advanced Super View & BLACK TFT LCD
Number of dots 3,147,264 dots (1366 768 3 dots)
Brightness 450 cd/m2
Backlight 60,000 hours (at Backlight Standard position)
Viewing angles H : 170OV : 170O
Audio out 10W 2
MONITOR OUTPUT S-VIDEO out, AV out
188 W
ANALOG ANTENNA 75 Unbalance, F Type for VHF/UHF/CATV in 1
DIGITAL ANTENNA 75 Unbalance, F Type for Digital Air in 1
DIGITAL AUDIO OUTPUT
Optical Digital audio output 1 (PCM/Dolby Digital)
45.2 lbs./20.5 kg (w/o stand)
56.2 lbs./25.5 kg (with stand)
Digital Terrestrial
Broadcast (8VSB)
2-69ch
Dimension (W H D) 431/2221/84
31/64 inch (w/o stand),
431/22515/32 123/64 inch (with stand)
Operating temperature 32OF to 104OF (0OC to 40OC)
××
×
×
×
×
×
×× ×
×××
×××
××
Ω
Ω
++ +

7
LC-37DB5U
OPERATION MANUAL
Part names
TV (Front) TV (Rear)
POWER indicator**
OPC sensor*
POWER (On/Off)
button
INPUT
button
Volume buttons (VOL / )
Channel buttons
(CH / )
Remote control sensor OPC indicator*
RESET*
INPUT 3
terminals
SYSTEM
RESET**
DIGITAL AUDIO
OUTPUT
*Press RESET if the TV cannot return to its original state after performing various operations.
AV MODE resets to DYNAMIC (Fixed)
TV channel returns to initial channel setting (Air: 2ch, Cable:1 or 2ch)
Audio setting initializes
Surround resets to Off
Image position initializes
**Press SYSTEM RESET if the TV does not operate after starting up.
NOTE
Pressing RESET will not work if the TV is in standby mode.
Pressing RESET will not delete channel preset or secret number.
AC INPUT terminal
RS-232C
terminal
INPUT 2 terminals
INPUT 1
terminals
INPUT 4
terminals
MONITOR OUTPUT terminals
Antenna input terminal
(ANALOG)
Antenna input
terminal (DIGITAL)

8
LC-37DB5U
P Using external equipmentart names
Remote control unit
1TVPOWER: Switch the TV power on or standby.
2 DISPLAY: Display the channel information.
3 SOURCE POWER: Turns the power of the external
equipment on and off.
4 External equipment operational buttons:Operate the
external equipment.
5 0 9: Set the channel.
6(DOT)
7 INPUT: Select a TV input source. (TV, INPUT 1, INPUT
2, INPUT 3, INPUT 4)
8VOL/: Set the volume.
9 SURROUND:Select Surround settings.
10 FREEZE: Set the still image. Press again to return to
normal screen.
11 EXIT: Turn off the menu screen.
12 SLEEP: Set the sleep timer.
13 AUDIO: Selects the MTS/SAP or the audio mode during
multi-channel audio broadcasts.
14 FUNCTION: Switches the remote control for TV, CBL/
SAT, VCR, DVD and AUDIO operation. Indicator lights
up for the current mode.
* To enter the code registration mode, you need to press
FUNCTION and DISPLAY at the same time.
15 LIGHT :When pressed all buttons on the remote
control unit will light. The lighting will turn off if no
operations are performed within about 5 seconds. This
button is used for performing operations in low-light
situations.
16 VIEW MODE: Select the screen size.
17 ENT: Enters a channel selection when choosing with
the 0-9 buttons.
18 FLASHBACK: Return to the previous channel or input
external mode.
19 CH / : Select the channel.
20 MUTE: Mute the sound.
21 MENU: Display the menu screen.
22 ////ENTER:Select a desired item on the screen.
23 RETURN: Return to the previous menu screen.
24 FAVORITE CH
A, B, C, D: Select four preset favorite channels in four
different categories.
While watching, you can toggle the selected channels
by pressing A, B, C and D.
25 FAVORITE: Register favorite channel.
26 CC: Display captions during closed-caption source.
27 AV MODE: Select an audio or video setting.
(STANDARD, MOVIE, GAME, USER, DYNAMIC
(Fixed), DYNAMIC.)
NOTE
When using the remote control unit, point it at the TV.
3
2
114
5
6
4
8
17
15
16
18
19
7
20
10
9
21
11 23
24
25
12
13 27
22
26
_
You can connect many types of external equipment to your TV, like a DVD player, VCR, Digital TV tuner, HDMI
equipment, game console and camcorder. To view external source images, select the input source from INPUT
on the remote control unit or on the TV.
CAUTION
To protect all equipment, always turn off the TV before
connecting to a DVD player, VCR, Digital TV tuner, HDMI
equipment, game console, camcorder or other external
equipment.
NOTE
Please refer to the relevant operation manual (DVD player,
etc.) carefully before making connections.
Each time INPUT is pressed, the input source toggles.
Refer to your external equipment operation manual for
the signal type.
Displaying an external equipment
image
Explanation here is for the setting when connecting
DVD to INPUT1 terminal.
INPUT button
To watch a DVD image, select "INPUT1" from "INPUT
SOURCE" menu using INPUT on the remote control
unit or on the TV.
INPUT SOURCE
TV
INPUT1
INPUT2
INPUT3
INPUT4
1
Auto
COMPONENT
VIDEO
For INPUT1 signal
Select the desired signal type.
The setting is stored and can be selected on the
"INPUT SOURCE" menu.
Press MENU and the MENU screen displays.
2
3
Press / to select "Input Select", and then
press ENTER.
4
Press / to select "Option".
NOTE
If the image does not come in clearly, you may need to
change the input signal type setting on the "Input Select"
menu.
Selecting the INPUT signal
(Example)

9
LC-37DB5U
Using external equipment
DVD player/
DigitalTV STB
Connecting a DVD player or a DigitalTV STB (Air or Cable)
You can use the INPUT 1, INPUT 2 or INPUT 3 terminals when connecting to a DVD player, a Digital TV STB (Air
or Cable) and other audiovisual equipment.
TE
AV cable
(commercially
available)
DVD player/
DigitalTV STB
When using component cable. (INPUT 1 or 2) When using composite cable. (INPUT 1, 2 or 3)
Component
video cable
(commercially
available)
Audio cable
(commercially
available)
VCR/Game console/
Camcorder
AV cable
(commercially available)
Connecting aVCR, game console or
camcorder
A VCR, game console, camcorder and some other
audiovisual equipment are conveniently connected
using the INPUT 1 to 3 terminals.
S-video cable
(commercially
available)
NOTE
The S-video terminal has priority over the video terminals.
(INPUT 3 only)
To optical digital input of external audio devices
Optical fiber cable
Using Digital Audio Output
It is possible to output audio through the DIGITAL
AUDIO OUTPUT terminal.
PCM audio outputs from the terminal.
NOTE
When attempting to record copy protected material on a VCR or other recording device, the copy protection will activate
and the protected material will not be recorded correctly. In addition, attempting to display copy protected material on a
monitor connected via a VCR, whether for the purpose of viewing or not, will cause an inferior quality picture to be
displayed. This is not a fault of the equipment. Please view copy protected material by connecting the product directly to
the monitor.
Connecting HDMI equipment
You can use the INPUT 4 terminal when connecting an HDMI equipment.
HDMI equipment
HDMI cable (Commercially available)
Displaying an image from HDMI
equipment
To watch an HDMI equipment image, select
"INPUT4" from "INPUT SOURCE" menu
using INPUT on the remote control unit or
on the TV.
INPUT SOURCE
TV
INPUT1
INPUT2
INPUT3
INPUT4
1
Press MENU and the MENU screen displays.
2
3
Press / to select "HDMI Setup", and then
press ENTER.
4
Press / to select "Option".
MENU
[Option ... HDMI Setup]
Option
Digital Noise Reduction
Output Select
Audio Only
Quick Shoot
[Fixed]
HDMI Setup
[Low]
[Off]
5
Press / to select the desired item and
press ENTER.
Press / / / to select the desired setting
and press ENTER.
6
NOTE
Refer to your external equipment operation manual for
the signal type.
When using an HDMI-DVI
conversion cable, input the
audio signal to AUDIO
terminal of INPUT4.
Selectable items
RGB/YCbCr 4:4:4/
YCbCr 4:2:2
ITU601/ITU709
Standard/
Out of standard
Enable/Disable
Digital/Analog
HDMI Setup
items
Signal
Type
Color
Matrix
Dynamic
Range
Auto View
Audio
Select
Description
Select the video signal
type from the HDMI
terminal.
Select the internal color
space conversion method
when an RGB signal is
input.
Select the signal amplitude
range. Usually, select
"Standard".
Set whether or not to use
VIEW MODE based on
signal recognition,
including an HDMI signal.
Select "Digital" for audio
signal via the HDMI
terminal. Select "Analog"
for audio signal via the R-
AUDIO -L terminal.

10
LC-37DB5U
Appendix
Removing the stand
Before detaching (or attaching) stand, unplug the AC cord from the AC INPUT terminal.
CAUTION
Do not remove the stand from theTV unless using an optional wall mount bracket to mount it.
Before attaching/detaching stand
Before performing work make sure to turn off the TV.
Before performing work spread cushioning over the base area to lay the TV on. This will prevent it from being
damaged.
NOTE
To attach the stand, perform the above steps in reverse order.
Setting theTV on the wall
CAUTION
Installing the TV requires special skill that should only be performed by qualified service personnel. Customers
should not attempt to do the work themselves.SHARP bears no responsibility for improper mounting or mounting
that results in accident or injury.
Using an optional bracket to mount theTV
You can ask a qualified service professional about using an optional bracket to mount the TV to the wall.
Carefully read the instructions that come with the bracket before beginning work.
Vertical mounting Angular mounting
Hanging on the wall
Wall mount bracket. (See the bracket instructions for details.)
2
Unfasten the four screws used to
secure the stand in place.
1
Unfasten the screw used to secure the
bracket in place.
3
Detach the stand from the TV.
(Hold the stand so it will not drop from
the edge of the base area.)
About setting theTV angle
5
o
No power
Unit cannot be operated.
Remote control unit does not
operate.
Picture is cut off/with sidebar
screen.
Strange color, light color, or color
misalignment
Power is suddenly turned off.
No picture
No sound
Problem Possible Solution
Check if you pressed TV POWER on the remote control unit.
If the indicator on the TV does not light up, press TV POWER on the remote
control unit.
Is the AC cord disconnected?
Has the power been turned on?
External influences such as lightning, static electricity, may cause improper
operation. In this case, operate the unit after first turning on the power of the TV
or unplugging the AC cord and replugging it in after 1 or 2 minutes.
Is the FUNCTION set correctly? Set it to the TV setting position.
Are batteries inserted with polarity ( , ) aligned?
Are batteries worn out? (Replace with new batteries.)
Are you using it under strong or fluorescent lighting?
Is a fluorescent light illuminated near the remote control sensor?
Is the image position correct?
Are screen mode adjustments such as picture size made correctly?
Adjust the picture tone.
Is the room too bright? The picture may look dark in a room that is too bright.
Is the sleep timer set?
Check the power control settings.
The unit's internal temperature has increased.
Remove any objects blocking vent or clean.
Is connection to other components correct?
Is correct input signal source selected after connection?
Is the correct input selected?
Is picture adjustment correct?
Is "On" selected in "Audio Only"?
Is the volume too low?
Is "Variable" selected in "Output Select"?
Troubleshooting
Cautions regarding use in high and low temperature environments
When the unit is used in a low temperature space (e.g. room, office), the picture may leave trails or appear slightly
delayed. This is not a malfunction, and the unit will recover when the temperature returns to normal.
Do not leave the unit in a hot or cold location. Also, do not leave the unit in a location exposed to direct sunlight or near
a heater, as this may cause the cabinet to deform and the Liquid Crystal panel to malfunction.
Storage temperature:
–
4
o
F to +140
o
F (
–
20
o
C to +60
o
C)
Troubleshooting-Digital broadcasting
The error message about reception of broadcast
The example of an error message
displayed on a screen Error code Possible Solution
Failed to receive broadcast. E202
No broadcast now. E203
Check the antenna cable. Check that the antenna is correctly
setup.
Check the broadcast time in the program guide.
+_

11
LC-37DB5U
Appendix
RS-232C port specifications
Return codeCommand 4-digits Parameter 4-digits
PC Control of theTV
When a program is set, the TV can be controlled from the PC using the RS-232C terminal. The input signal
(PC/AV) can be selected, the volume can be adjusted and various other adjustments and settings can be
made, enabling automatic programmed playing.
Attach an RS-232C cable cross-type (commercially available) to the supplied Din/D-Sub RS-232C for the
connections.
NOTE
This operation system should be used by a person who is accustomed to using computers.
Communication conditions
Set the RS-232C communications settings on the PC to match the TV's communications conditions.
The TV's communications settings are as follows:
Baud rate:
Parity bit:
Data length:
Stop bit:
Flow control:
9,600 bps
8 bits
None
1 bit
None
Command format
Communication procedure
Send the control commands from the PC via the RS-232C connector.
The TV operates according to the received command and sends a response message to the PC.
Do not send multiple commands at the same time. Wait until the PC receives the OK response before sending
the next command.
Eight ASCII codes CR
Command 4-digits: Command. The text of four characters.
Parameter 4-digits: Parameter 0 9, x, blank, ?
Parameter
Input the parameter values, aligning left, and fill with blank(s) for the remainder. (Be sure that 4 values are input for the
parameter.)
When the input parameter is not within an adjustable range, "ERR" returns. (Refer to "Response code format".)
Any numerical value can replace the "x" on the table.
When "?" is input for some commands, the present setting value responds.
C1 C2 C3 C4 P1 P2 P3 P4
0055
100
30
0009
0
????
?
_
_
+
Command table
Commands not indicated here are not guaranteed to operate.
CONTROL ITEM COMMAND
PARAMETER
CONTROL CONTENTS
POWER SETTING It shifts to standby.
It input-switches by the toggle. (It is the same as an input change key)
It input-switches to TV. (A channel remains as it is. (Last memory))
It input-switches to INPUT1~INPUT4.
An input change is also included.
Although it can choose now, it is toggle operation in inside.
Although it can choose now, it is toggle operation in inside.
(Toggle)
Input terminal number (1 4)
AUTO
VIDEO
COMPONENT
(Toggle)
STANDARD
MOVIE
USER
GAME
DYNAMIC (Fixed)
DYNAMIC
Volume (0 60)
AV mode. ( 10)
AV mode. ( 20)
(Toggle)
An input change is included if it is not TV display.
In Air, 2 69ch is effective.
In Cable, 1 125ch is effective.
If it is not TV display, it will input-switch to TV. (same function as CH )
If it is not TV display, it will input-switch to TV. (same function as CH )
Toggle operation of a closed caption.
Side Bar
S.Stretch
Zoom
Stretch
OFF
OFF TIMER 30 MIN.
The channel number of TV
The channel number of TV 1
The channel number of TV 1
(Toggle)
(1 125)
AUTO
POWR
ITGD
ITVD
IAVD
INP1
INPUT SELECTION A TOGGLE
INPUT SELECTION B
AV MODE SELECTION
VOLUME
POSITION
VIEWMODE
SLEEP TIMER
CHANNEL
CC
DIRECT
(ANALOG)
(DIGITAL)
CH UP
CH DOWN
CHANNEL
H-POSITIONH-POSITION
V-POSITION
INPUT 1
AVMD
VOLM
HPOS
VPOS
OFTM
DCCH
CHUP
CHDW
CLCP
WIDE
0
x
x
*
0
1
2
0
*
*
*
0
*
x
x
x
1
0
1
2
3
4
1
2
3
4
5
6
*
_
_
_
_
_
_
_
_
_
_
*
*
*
_
_
_
_
_
_
_
_
_
_
_
_
_
_
*
_
_
_
_
_
_
_
_
_
_
*
*
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
DIGITAL Air (Two-Part numbers, 2-digit plus 2-digit)(0101-9999)
DIRECT
CHANNEL
DA2P * * * *
_
_
_
(Toggle)
AUDIO SELECTION ACHA x _ _ _
_
_
OFF TIMER 60 MIN.
OFF TIMER 90 MIN.
2
3
_
_
_
_
_
_
OFF TIMER 120 MIN.4___
(Toggle)
On
Off
MUTE MU T E 0
1
2
_
_
_
_
_
_
_
_
_
(Toggle)
On
Off
SURROUND ACSU 0
1
2
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
AUTO
VIDEO
COMPONENT
AUTOINP2
INPUT 2 0
1
2
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
_
TV
INPUT1-4
NOTE
If an underbar (_) appears in the parameter column, enter a space.
If an asterisk (*) appears, enter a value in the range indicated in brackets under CONTROL CONTENTS.
As long as that from which the parameter ( ) in the table is a numerical value, it may write anything.
Return code (0DH)
Response code format
Normal response
Problem response (communication error or incorrect command)
Return code (0DH)
OK
ERR
+
_
_
_
_
_
_
_
_
_
±
±
_
×

12
LC-37DB5U
Basic adjustment settings
Menu items
List of menu items to help you with operations
OPC
Backlight
Contrast
Brightness
Color
Tint
Sharpness
Advanced
ColorTemp.
Black
3D-Y/C
Monochrome
Film Mode
Picture
No Signal Off
No Operation Off
EZ Setup
CH Setup
Antenna Setup-DIGITAL
Input Label
Parental CTRL
Position
Picture Flip
Standby Mode
Language
Treble
Bass
Balance
Surround
Audio Only
Digital Noise Reduction
HDMI Setup
Input Select
Output Select
Quick Shoot
Color System
Caption Setup
ProgramTitle Display
Audio
Power Control
Setup
Option
Audio Setup
Digital Setup

13
LC-37DB5U
DIMENSIONS
2613/32 ( 671)
431/2 ( 1105)
323/8 ( 822.6)
77/8 ( 200)
123/64 ( 306)
431/64 ( 114) 41/8 ( 105)
77/8 (
200)
41/64 (
104)
221/8 (
562)
311/32 (
85)
2515/32 (
647)
1817/64 (
463.9)
1431/64 (
367.8)
Unit: inch/(mm)

14
LC-37DB5U
REMOVING OF MAJOR PARTS
1. Remove the Terminal Cover 1.
2. Remove the 1 lock screw 2and detach the Bracket Cover.
3. Remove the 4 lock screws 3and detach the Stand.
4. Remove the Rear Cabinet.
Remove the 19 lock screws 4, 9 lock screws 5, 7 lock screws 6and detach the Rear Cabinet.
2
4
1
3
6
5
5
Stand
Terminal Cover
Bracket
Cover
Rear
Cabinet
5

15
LC-37DB5U
5. Remove the 7 lock screws 7and detach the Center Angle.
6. Detach the LCD Control Shield 8.
7. Remove the 5 lock screws 9and detach the Main Shield A.
8. Disconnect the connectors 0and q, and detach the SP Box (R) and SP Box (L).
9. Remove the connectors,(P5703,P3103,P1105,P2501,P3005,P3101,CN1,CN2,CN801,CN802,CN803,
CN804,CN805,CN7502,CN7501,and CN7601) Remove the 2 Coaxial Cables,(RED and BLACK).
LCD Control Shield
Main Shield A
SP Box (R) SP Box (L)
7
8
9
10 11
P3005
P3101
P2501
P1105
P5703 CN803 CN801
CN802
CN804
CN805
P3103
CN1 CN2
CN7501
CN7601
CN7502
LC-32/37D4U
Coaxial Cables
RED & BLACK

16
LC-37DB5U
10. Remove the 4 lock screws wand FFC. Detach the Main Shield B and Digital PWB.
11. Remove the 4 lock screws eand detach the Digital PWB.
12. Remove the 2 lock screws rand detach the Jack Cover C.
13. Remove the 2 lock screws tand detach the Main PWB.
14. Remove the 3 lock screws yand the 1 lock screw u, and detach the AV PWB. Remove 1 lock screw iand
detach the Jack Cover B. Remove the 4 lock screws oand detach the Jack Cover A.
15. Remove the 6 lock screws pand detach the Power PWB.
16. Remove the 4 lock screws aand detach the LCD Control PWB.
17. Remove the 2 lock screws sand detach the R/C, LED PWB.
18. Remove the KEY PWB.
18-1. Remove the 2 lock screws dfrom theTop Control Cover.
18-2. Remove the 3 lock screws ffrom the KEY PWB.
24
23
21
20
15
22 R/C, LED PWB
Main PWB
Main Shield B
POWER PWB
LCD Control PWB
AV PWB
FFC
Jack Cover A
Jack Cover C
Jack Cover B
12
13
16
17
18
19
KEY PWB
Top Control Cover
Digital PWB
14
14

17
LC-37DB5U
19. Remove the 4 lock screws gand take out of the LCD Panel Module.
25 25
LCD Panel Module
25 25

19
LC-37DB5U
18
LC-37DB5U
A
B
C
D
E
F
G
H
I
J
12345678910
11 12 13 14 15 16 17 18 19
BLOCK DIAGRAM

21
LC-37DB5U
20
LC-37DB5U
A
B
C
D
E
F
G
H
I
J
12345678910
11 12 13 14 15 16 17 18 19
OVERALL WIRING DIAGRAM

22
LC-37DB5U
Ref. No. Part No. ★Description Code Ref. No. Part No. ★Description Code
PARTS LIST
PARTS REPLACEMENT
Replacement parts which have these special safety characteristics
identified in this manual;electrical components having such features
are identified by åand shaded areas in the Replacement Parts Lists
and Schematic Diagrams.The use of a substitute replacement part
which dose no have the same safety characteristic as the factory
recommended replacement parts shown in this service manual may
create shock, fire or other hazards.
"HOWTO ORDER REPLACEMENT PARTS"
To have your order filled promptly and correctly, please furnish the
following informations.
1. MODEL NUMBER 2. REF. NO.
3. PART NO. 4. DESCRIPTION
in USA: Contact your nearest SHARP Parts Distributor to order.
For location of SHARP Parts Distributor, Please call Toll-
Free; 1-800-BE-SHARP
★ MARK: SPARE PARTS-DELIVERY SECTION
LISTE DES PIECES
CHANGE DES PIECES
Les pi`eces de rechange qui pr élelesentent ces caract éleristiques
sp éleciales de s élecurit éle, sont identifi élees dans ce manuel :
lespi`eces élelectriques qui pr élesentent ces particularit éles, sont
rep éler élee par la marque ået sont hachur élees dans les listes de
pi`eces et dans les diagrammes sch élematiques.
La substitution d'une pi`ece de rechange par une autre qui ne pr
éLesente pas les m éoemes caract éLeristiques de s élecurit éle que
la pi`ece recommand élee parl'usine et dans ce manuel de service,
peut provoquer une éLelectrocution, un incendie ou toutautre sinistre.
"COMMENT COMMANDER LES PIECES DE
RECHANGE"
Pour que votre commande soit rapidement et correctement remplie,
veuillez fournir les renseignements suivants.
1.NUMERO DU MODELE 2. NO.DE REF
3. NO. DE PIECE 4. DESCRIPTION
in CANADA: Contact SHARP Electronics of Canada Limited
Phone [phone]
PRINTEDWIRING BOARD ASSEMBLIES
(NOT REPLACEMENT ITEM)
DUNTKD331FE16 J DIGITAL Unit CG
DUNTKD352WE03 R AV Unit CB
DUNTKD353WE01 R KEY Unit AK
DUNTKD354WE01 R R/C, LED Unit AN
DUNTKD376FM07 R MAIN Unit CB
RDENCA140WJQZ X POWER Unit BX
LCD PANEL
NOTE: THE PARTS HERE SHOWN ARE SUPPLIED AS AN
ASSEMBLY BUT NOT INDEPENDENTLY.
RLCUCA026WJZZ J 37 WIDE LCD PANEL MODULE Unit ER
DUNTKD331FE16
DIGITAL UNIT
RESISTORS
R8106 VRS-CZ1JF470JY J 47 1/16W Metal Oxide AA
R8107 VRS-CH1JF470JY J 47 1/16W Metal Oxide AA
R8125 VRS-CH1JF470JY J 47 1/16W Metal Oxide AA
R8164 VRS-CZ1JF470JY J 47 1/16W Metal Oxide AA
R8198 VRS-CZ1JF470JY J 47 1/16W Metal Oxide AA
R8208 VRS-CZ1JF103JY J 10k 1/16W Metal Oxide AA
R8209 VRS-CZ1JF103JY J 10k 1/16W Metal Oxide AA
R9537 VRS-CH1JF000JY J 0 1/16W Metal Oxide AA
R9538 VRS-CH1JF000JY J 0 1/16W Metal Oxide AA
R9539 VRS-CZ1JF000JY J 0 1/16W Metal Oxide AA
DUNTKD352WE03
AV UNIT
DIODE
D103 RH-PXA089WJZZY R PhotoDiode AC
RESISTOR
R108 VRS-CY1JF561JY R 560 1/16W Metal Oxide AA
RESISTORS
R3926 VRS-CY1JF102JY R 1k 1/16W Metal Oxide AA
R3930 VRS-CY1JF102JY R 1k 1/16W Metal Oxide AA
DUNTKD354WE01
R/C, LED UNIT