Sharp LC-37AD5E Schematic

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LC-37AD5E

SERVICE MANUAL

No. S77K9LC37AD5E

LCD COLOUR TELEVISION

CONTENTS

SAFETY PRECAUTION

IMPORTANT SERVICE SAFETY PRE-

CAUTION ............................................................i

Precautions for using lead-free solder ...............ii

CHAPTER 1. OPERATION MANUAL

[1] SPECIFICATIONS ......................................... 1-1

[2] OPERATION MANUAL .................................. 1-2

[3] DIMENSIONS ................................................ 1-7

CHAPTER 2. REMOVING OF MAJOR PARTS

[1] REMOVING OF MAJOR PARTS ................... 2-1

CHAPTER 3. ADJUSTMENT PROCEDURE

[1] After replacement of any PWB and/or IC for

repair, note the following. ............................... 3-1

[2] SOFTWARE UPDATING................................ 3-1

[3] Entering and exiting the adjustment pro-

cess mode.................................................... 3-16

[4] Remote controller key operation and de-

scription of display in adjustment process

mode. ........................................................... 3-16

[5] Adjustment process mode menu.................. 3-17

[6] Special features............................................ 3-18

[7] Video signal adjustment procedure.............. 3-19

[8] White Balance Adjustment ........................... 3-20

[9] Initialization to factory settings ..................... 3-21

[10] Lamp error detection .................................... 3-21

[11] Public Mode (Hotel Mode)............................ 3-22

MODEL

CHAPTER 5. MAJOR IC INFORMATIONS

[1] MAJOR IC INFORMATIONS .........................5-1

CHAPTER 6. OVERALL WIRING DIAGRAM/BLOCK DIAGRAM

[1] OVERALL WIRING DIAGRAM ......................6-1

[2] MAIN BLOCK DIAGRAM...............................6-2

[3] SYSTEM BLOCK DIAGRAM .........................6-3

[4] POWER BLOCK DIAGRAM ..........................6-4

CHAPTER 7. PRINTED WIRING BOARD

[1] MAIN UNIT PRINTED WIRING BOARD........7-1

[2] AV UNIT PRINTED WIRING BOARD............7-5

[3] POWER UNIT PRINTED WIRING

BOARD.......................................................... 7-8

[4] D-TUNER UNIT PRINTED WIRING

BOARD........................................................7-10

[5] KEY UNIT PRINTED WIRING BOARD ....... 7-10

[6] DIGITAL UNIT PRINTED WIRING

BOARD........................................................ 7-11

[7] R/C, LED UNIT PRINTED WIRING

BOARD........................................................7-15

CHAPTER 8. SCHEMATIC DIAGRAM

[1] DESCRIPTION OF SCHEMATIC DIA-

GRAM............................................................8-1

[2] SCHEMATIC DIAGRAM................................8-2

Parts Guide

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CHAPTER 4. TROUBLESHOOTING TABLE

[1] TROBLESHOOTING TABLE ......................... 4-1

Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

This document has been published to be used for after sales service only. The contents are subject to change without notice.

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SAFETY PRECAUTION

Service Manual

IMPORTANT SERVICE SAFETY PRECAUTION

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 AGAINST A RISK OF FIRE REPLACE ONLY WITH SAME TYPE FUSE.

• 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 1.05 V peak (this corresponds to 0.7 mA peak AC.) or more is excessive and indicates a potential shock hazard which must be corrected before returning the monitor to the owner.

F701 (T4AL/AC250V)

 BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard)

Before returning the receiver to the user, perform the following safety checks:

3. 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.

4. 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.

5. To be sure that no shock hazard exists, check for leakage current in the following manner.

• Plug the AC cord directly into a 220~240 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.

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

TO EXPOSED METAL PARTS

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 “ ” 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.

DVM

AC SCALE

1.5k ohm 10W

0.15µF

TEST PROBE

CONNECT TO KNOWN EARTH GROUND

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Precautions for using lead-free solder

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.

L F a/a

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.

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.

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

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CHAPTER 1. OPERATION MANUAL

[1] SPECIFICATIONS

Service Manual

urkis h/Gr

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[2] OPERATION MANUAL

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[3] DIMENSIONS

Units: inches (mm)

919.0

822.6

650.5

601.5

463.8

370.4

49.0

547.0

200.0

293.0

116.5114.8

85.0

200.0

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Set each holder like this way. Others are omitted .

#LCD HOLDER Set to gide lib of CAB-A

Push untill Locked

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CHAPTER 2. REMOVING OF MAJOR PARTS

Service Manual

[1] REMOVING OF MAJOR PARTS

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1. Remove the 4 lock screws , and the 12 lock screws . Detach the Rear Cabinet.

Rear Cabinet

2. Remove the 6 lock LCD Side Holders .

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STAND ANGLE UNIT

Wire "KM" to WH

3. Remove the 9 lock screws . Detach the Stand Angle Unit.

4. Remove the 2 lock screws . Detach the Top Control Cover Ass'y.

TOP CONTROL COVER

Wire "KM"

TOP CONTROL COVER ASS'Y

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5. Remove the 2 lock scrwes , and the 4 lock screws . Detach the Center Angle-L/R.

CENTER ANGLE LCENTER ANGLE R

6. Remove the 2 lock scrwes . Detach the Digital Shield.

DIGITAL SHIELD

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FOR Wire "SP"

Wire "SP" to SP Lib

Wire "SP" to WH

FOR Wire "RA"

#StoptomoveCore, No shape to Shield A ngle

Wire "RA" to WH

7. Remove all the connectors from PWBs.

Wire "SP"

Wire "SP-R"

SP-R

Wire "SP-L"

SP-L

Wire "RA"

for "RA" wire

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8. Remove the 5 lock screws . and detach the Chassis Tray Unit.

9. Remove all the connectors from PWBs.

Chassis Tray Unit

Wire "SH"

Wire "LV"

Wire "LB" to WH

Wire "LB"

Wire "LV" to WH

Wire "LA"

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Tuner Unit

10.Remove the 1 lock screw . Detach the Terminal Cover.

11.Remove the 2 lock screws . Detach the D-Tuner Unit.

D-TUNER Unit

B to B connector

Chassis Tray Unit

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12.Remove the 2 lock screws . Detach the R/C, LCD Unit.

R/C LED UNIT With Wire "RA"

Wire "RA"

#R/C LED PWB Set to gide lib of CAB-A

Wire "RA"

LED COVER

Wire "RA"

R/C, LED UNIT

#R/CLEDPWBSettogidelibofCAB-A

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13.Remove the 4 lock screws , and 8 lock screws . Detach the LCD Angle.

LCD ANGLE TOP

14 13

LCD ANGLE BOTTOM

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CHAPTER 3. ADJUSTMENT PROCEDURE

Service Manual

[1] After replacement of any PWB and/or IC for repair, note the following.

When replacing the following units, be sure to prepare the new units loaded with updated software.

MAIN-UNIT: DUNTKD890FM32

• Note that an IC into which ROM data is written is available for MAIN-UNIT servicing (see below)

IC1901 VHi24LC2BiNEES EDID (HDMI) IC1902 RH-iXC023WJZZS EDID (HDMI) IC2303 RH-iXB731WJZZS EDID (PC)

[2] SOFTWARE UPDATING

There are 2 methods to update software in the VCTp: I2C method, RS-232C HyperTerminal and RS-232C Tera Term method.

• RS-232C method is allowed when the TV is working properly and the action should be only software upgrade.

1. RS-232C Method Description (HyperTerminal).

The hardware tools requirement are:

1. A Modem-null (Cross type) DB9 female to DB9 female cable.

2. An adaptor DB9 male to mini-Din 9 pin male cable (Sharp Code: QCNWGA015WJPZ)

3. Make the connections as indicated in the figure:

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Computer TV set

Before using RS-232C updating method is necessary to configure a Terminal PC software. HyperTerminal has been selected as a Terminal software because it’s include in all Windows versions as an accessory, and you can find it inside “Accessories\Communications” folder. For this reason, please follow carefully the next steps:

1) First time HyperTerminal is used, it’s necessary to configure some settings. Follows next action to configure two connection: low speed

(9600bps) and high speed (115200bps).

2) Create a New Connection file with name “P55_9600bps”.

3) Select a free COM port and select the Port Settings properties as follows:

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4) Click on “File\Properties” menu for selecting the General and ASCII properties as follows:

5) Select “New Connection” in the File Menu.

6) Answer “Yes” to close current connection and “Yes” to save session “P55_9600bps”.

7) Create a new connection with the name “P55_115200bps”.

8) Select a the same COM port used in item 2 and select the Port Settings properties as follows:

9) Select the same General and ASCII properties as item 3.

10)Close HyperTerminal session, answering “Yes” to close current connection and “Yes” to save session “P55_115200bps”.

To start updating session, click over “P55_9600bps” icon that you can find in the “START\All programs\Accessories\ Communications\HyperTerminal\HyperTerminal” folder and follow next procedure:

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1) Check the connection between TV set and PC, sending a wrong command, as for example: “aaa”. TV set returns an “ERR” label as an syntaxis

ERROR (Not correct order or sequence).

2) Send the command “DWMD” to enter TV set in Download Mode. The TV set answer sending same symbol continuosly. If this symbol character

doesn’t appear, please don’t worry and pass to next step.

3) Close this connection and open “P55_115200bps” connection clicking over the “P55_115200bps” that you can find in “START\All pro-

grams\Accessories\ Communications\HyperTerminal\HyperTerminal” folder.

4) Using “Transfer\Send file...” menu, select desired file (.bin format) and the transmission protocol (Xmodem) as show below.

5) After press “Send” button the updating process starts as follows:

6) When flash update process finishes, the “Flash Programming Complete” label appears in the screen, the device automatically go to switch off,

and in a few seconds go to switch on again.

VERY IMPORTANT NOTE:

During the updating time, please don’t use the PC for other purpouses, in order to abolish communication problems between TV set and PC. If TV set was not updated properly, the TV won’t have the software to startup again, and you must follow the “I2C method” to update another time the TV set.

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2. RS-232C Method Description (Tera Term)

The hardware tools requirement are:

1. A Modem-null (Cross type) DB9 female to DB9 female cable.

2. An adaptor DB9 male to mini-Din 9 pin male cable (Sharp Code: QCNWGA015WJPZ)

3. Make the connections as indicated in the figure:

Computer TV set

Software requirements:

To upgrade VCTp software from RS-232C external connector is necessary to use a Tera Term (Pro) free software.

The URL of Tera Term home page is:

http://hp.vector.co.jp/authors/VA002416/teraterm.html

(The address may be changed in future)

Tera Term (Pro) supported operating systems:

MS-Windows 95 or upper

MS-Windows NT 3.5 and 4.0 or upper

Note.- For Windows 3.1 use Tera Term version 1.X.

Copy all the distribution files to an empty floppy disk or temporary directory (for example C:\ TEMP).

Run SETUP.EXE and follow the instruction given by it.

After the installation, the distribution? les are no longer needed, you can delete them or may keep them in the floppy disk.

Ho w to us e Tera Te r m Pro:

When the Tera Term (Pro) program is used, it’s necessary to shape some settings. Follows next action to configure the connection:

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1) Select: Serial→COM X→ O.K.

2) Select: Term inal

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3) Choose the same options as the above picture.

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4) Select: Setup → Serial port → O.K. Appear the follow screen:

5) Select follows settings:

Serial port to use: COM x Baud rate: 9600 Data: 8 bits Parity: none Stop: 1 bit Flow control: none Enter O.K.

6) Check the connection between TV set and PC, sending a wrong command, as for example: “aaa”. TV set returns an “err” label as an syntaxes ERROR (Not correct order or sequence).

Send a “DWMD” (capital letters) command to enter TV set in Download Mode.

Change a baud rate to 115200.

Select: Setup → Baud rate → 115200 → O.K.

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7) Select: File → Transfer → XMODEM → Sent

8) Choose the file for upgrade and click “Open”.

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9) After select “Open” the upgrade process starts as follows:

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10)When flash update process finishes, the “Flash programming complete” label appear in the screen, the device automatically go to switch off, and in a few seconds go to switch on again.

VERY IMPORTANT NOTE:

During the updating time, please don’t use the PC for other purposes, in order to abolish communication problems between TV set and PC. If TV set was not updated properly, the TV won’t have the software to startup again, and you must follow the “I2C method” another time the TV set.

3. How to update the Digital Board Software.

There are 2 methods to update the Digital Board Software on Flash Memory (IC4203) thought the Digital Processor (IC4001).

• Jig RS-232 Method (From PC trough RS-232C COM port).

• PCMCIA CARD (Compact Flash Memory) Method.

NOTE: The PCMCIA method is only compatible with those PCs running XP Windows Version.

to update

3.1. Jig RS-232 Method Description

• Hardware requirements:

1. A modem null (Cross type) DB9 female to DB9 female cable.

2. The Jig Kit (Sharp Code: QCNWKA012WJZZ)

3. Make the connections as in the below figure.

Computer

TV Set

(CI Terminal)

Jig

RS-232C serial control cable (cross type, commercially available)

• Software requirements:

1. “Winupload” application software on PC.

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• How to setup the “Winupload” software for the first time:

1. Start “Winupload”. It will appear the following picture.

2. Select the most suitable RS232 Serial Port from “Port Setting” - “Process” Menu.

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3. Select the following settings from “Port Settings” Menu.

Bits Per Second: 115200

Parity: None

Data bits: 8

Stop bits: 1

Hardware Flow Control: OFF

• Procedure for updating the TV set.

1. Switch off the TV set to be updated, in DTV mode.

2. Start “Winupload”. It will appear the following picture on PC.

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3. Establish connection on Winupload Software.

4. Select “Upload URT file”

5. Select and open the “.urt” data file from data directory

NOTE: Consider the version shown below just an example, may be is not the latest one, and could be different depending on the TV set destination

(market/Country) or model.

6. Switch On the TV Set (previously in DTV Mode). The Uploading Process starts automatically.

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While the TV set is uploading the software, the following information is shown on the TV set screen.

Then, data transfer from PC to TV set finishes when the “Upload progress completed” label appears in the “Winupload” screen. Now, the TV set made some additional verification (Items #2 to #7). When the full uploading process is finished, in the “Winupload” window appears the label “Preparing to start application” for a new TV Set, and just now, in the TV screen of the updated set, appears a congratulations label (Item #8).

NOTE: Do not turn off the TV set while the software updating was in progress.

7. Unplug the AC cord.

8. Disconnect the Jig from TV Set.

• Software Version verification procedure.

1. Connect the AC cord and Switch On the TV Set.

2. Select DTV Menu on TV Set. The following On Screen Display will appear.

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3. Select “Version”. The updated version can be verified.

NOTE: Consider the version shown above just as example, may be is not the latest one, and could be different depending on the TV set destination

(market/Country) or model.

3.2. PCMCIA Card (Compact Flash) Method.

• Hardware requirements:

1. Compact Flash Memory Card.

2. PCMCIA Compact Flash Adapter or USB Multi Card Reader.

• Software requirements:

1. “StorageMediaManager1.0.1” application software, installed on PC.

2. “Loader 1.1” or higher application software, installed on DTV Set.

NOTE: Storage Media Manager only for Windows XP.

• How to prepare the CF Card using the “Storage Media Manager 1.0.1” (SMM):

1. Insert PCMCIA (Compact Flash (CF) + CF-Adapter)

2. Execute SMM. If SMM does not appear or a Windows Error Box appears, please verify there are no USB media drives connected to the PC.

NOTE: Consider that it's recommended remove unnecessary media during SMM execution. Probably, If you try to use an USB Multi Card Reader

with SMM doesn't work fine.

3. If the CF card has never been formatted for the SMM (is not same format type used in Windows), the SMM will show you the PCMCIA-CF drive as

a Windows Media Drives, hanged of the “My Computer” tree (“J” Drive in the picture showed below).

But, if the PCMCIA-CF card had been formatted previously by SMM, directly the PCMCIA-CF drive will appear in the SMM formatted Drives box (Sharp Drives). Please go to Item #6.

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