SHARP lc 37db5u Diagram
LC-37DB5U
SERVICE MANUAL
S95N9LC37DB5U
LCD COLOR TELEVISION
MODEL
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.
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.
CONTENTS
» 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
LC-37DB5U
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-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
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
RLCUCA026WJZZ
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
CABINET AND MECHANICAL PARTS
Please refer to a Parts list.
PACKING PARTS AND ACCESSORIES
Please refer to a Parts list.
2
LC-37DB5U
2
2
2
2
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
» Use an AC voltmeter ha ving with 5000 ohm per v olt,
or higher, sensitivity or measure the A C v oltage drop
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
CAUTION: FOR CONTINUED PROTECTION
AGAINST A RISK OF FIRE REPLACE ONLY WITH
SAME TYPE FUSE.
F701, F702 (5A, 250V)
F703 (1A, AC250V), F704 (117°C , 2A)
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.
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 120 volt AC outlet.
» Using two clip leads, connect a 1.5k ohm, 10 watt
TO EXPOSED
METAL PARTS
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.
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DVM
AC SCALE
1.5k ohm
10W
0.15 µF
TEST PROBE
CONNECT TO
KNOWN EARTH
GROUND
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
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"
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3
Replacement Parts List
.
and
LC-37DB5U
2
2
2
PRECAUTIONS A PRENDRE LORS DE LA REPARATION
Ë
Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement
accoutumé à toute vérification de sécurité et aux conseils suivants.
AVERTISSEMENT
de 0.15µF en série avec toutes les pièces métalliques
exposées du coffret et une terre connue comme une
1. N'entreprendre aucune modification de tout circuit.
C'est dangereux.
2. Débrancher le récepteur avant toute réparation.
conduite électrique ou une prise de terre branchée à
la terre.
• Utiliser un voltmètre CA d'une sensibilité d'au moins
5000Ω/V pour mesurer la chute de tension en travers
PRECAUTION: POUR LA PROTECTION CONTINUE
CONTRE LES RISQUES D'INCENDIE, REMPLACER
LE FUSIBLE
F701, F702 (5A, 250V)
F703 (1A, AC250V), F704 (117°C , 2A)
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.
T outes les vérifications doivent être refaites après a voir
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.)
VERIFICATIONS CONTRE L'INCEN-DIE ET
LE CHOC ELECTRIQUE
Avant de rendre le récepteur à l'utilisateur, effectuer
les vérifications suivantes.
Tous les courants mesurés ne doivent pas dépasser
0.5 mA.
Dans le cas contraire, il y a une possibilité de choc
électrique qui doit être supprimée avant de rendre le
récepteur au client.
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,
DVM
ECHELLE CA
1.5k ohm
10W
le dos du coffret, les couvercles ou blindages de réglage
et de compartiment, les réseaux de résistancecapacité, 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 120V. (Ne pas utiliser de
transformateur d'isolation pour cet essai).
• A l'aide de deux fils à pinces, brancher une résistance
de 1.5 kΩ 10 watts en parallèle avec un condensateur
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AUX PIECES
METALLIQUES
EXPOSEES
BRANCHER A UNE
TERRE CONNUE
AVIS POUR LA SECURITE
De nombreuses pièces, électriques et mécaniques,
dans les téléviseur ACL 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
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identifiées par la marque " å " et hachurées dans la
liste des pièces de remplacement
schématiques
.
et les
diagrammes
Pour assurer la protection, ces pièces doivent être
identiques à celles utilisées dans le circuit d'or igine.
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.
4
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:
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 how to obtain lead-free wire solder or soldering bit,
contact our service station or ser vice 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 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 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, ★ Description Code
ZHNDAi123250E J φ0.3mm 250g(1roll) BL
ZHNDAi126500E J φ0.6mm 500g(1roll) BK
ZHNDAi12801KE J φ1.0mm 1kg(1roll) BM
5
LC-37DB5U
SPECIFICATIONS
Item 37" LIQUID CRYSTAL TELEVISION,
Model: LC-37DB5U
LCD panel 37" Advanced Super View & BLACK TFT LCD
Number of dots 3,147,264 dots (1366 768 3 dots)
TV
Function
TV-standard (CCIR)
Receiving
Channel
VHF/UHF
CATV 1-125ch
Digital Terrestrial
Broadcast (8VSB)
American TV Standard ATSC/NTSC System
VHF 2-13ch, UHF 14-69ch
2-69ch
××
Audio multiplex BTSC System
Brightness 450 cd/m
2
Backlight 60,000 hours (at Backlight Standard position)
Viewing angles H : 170
Audio out 10W 2
Terminals AV in, COMPONENT in
Rear INPUT 1
INPUT 2
INPUT 3
AV in, COMPONENT in
S-VIDEO in, AV in
O
V : 170
×
O
INPUT 4 Audio in, HDMI in with HDCP
ANALOG ANTENNA
DIGITAL ANTENNA
DIGITAL AUDIO OUTPUT
75 Unbalance, F Type for VHF/UHF/CATV in 1
Ω
Ω
75 Unbalance, F Type for Digital Air in 1
Optical Digital audio output 1 (PCM/Dolby Digital)
×
×
×
MONITOR OUTPUT
S-VIDEO out, AV out
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
188 W
45.2 lbs./20.5 kg (w/o stand)
56.2 lbs./25.5 kg (with stand)
Dimension (W H D)
××
×
431/2 221/8 431/64 inch (w/o stand),
1
××
43
/2 2515/32 123/64 inch (with stand)
Accessories Operation manual ( 1), Remote control unit ( 1), AC cord ( 1), "AAA" size
battery ( 2), Cable clamp ( 1), Cable tie ( 1)
++
Operating temperature
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.
32OF to 104OF (0OC to 40OC)
×
×××
×××
+
6
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 (DIGIT
AL)
OPERATION MANUAL
LC-37DB5U
7
LC-37DB5U
P Using external equipmentart names
Remote control unit
1TV POWER: 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" fr
om "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)
8
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