Magnavox SYLVANIA EMERSON 19MF339B/F7 Schematic

LCD TV

chassis FL9.0

SERVICE MANUAL

Contents

19” LC195SLX SYLVANIA (Serial No. : DS1A**********) 19” LC195SLX SYLVANIA (Serial No. : DS2A**********) 19” LC195SLX SYLVANIA (Serial No. : DS3A**********) 19” LC195SLX SYLVANIA (Serial No. : DS4A**********) 19” LC195SLX SYLVANIA (Serial No. : TH3A**********) 19” LC195SLX SYLVANIA (Serial No. : TH4A**********) 19” LC195SLX SYLVANIA (Serial No. : TH6A**********) 19” LC195EMX EMERSON (Serial No. : DS1A**********) 19” LC195EMX EMERSON (Serial No. : DS2A**********) 19” LC195EMX EMERSON (Serial No. : DS3A**********) 19” LC195EMX EMERSON (Serial No. : DS4A**********) 19” LC195EMX EMERSON (Serial No. : TH3A**********) 19” LC195EMX EMERSON (Serial No. : TH4A**********) 19” LC195EMX EMERSON (Serial No. : TH5A**********) 19” LC195EMX EMERSON (Serial No. : TH6A**********) 22” 22MF339B/F7 MAGNAVOX 22” LC225SSX SYLVANIA Limited 19” LC195SSX SYLVANIA Limited (Serial No. : DS1A**********) 19” LC195SSX SYLVANIA Limited (Serial No. : DS2A**********) 19” 19MF339B/F7 MAGNAVOX (Serial No. : DS1A**********) 19” 19MF339B/F7 MAGNAVOX (Serial No. : DS2A**********)

All rights reserved. No part of this manual may be reproduced, copied, transmitted, disseminated, transcribed, downloaded or stored in any storage medium, in any form or for any purpose without the express prior written consent of Funai. Furthermore, any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.

Information in this document is subject to change without notice. Funai reserves the right to change the content herein without the obligation to notify any person or organization of such changes.

with the design is a registered trademark of Funai Electric Co., Ltd and may not be used in any way without the express written consent of Funai. All other trademarks used herein remain the exclusive property of their respective owners. Nothing contained in this manual should be construed as granting, by implication or otherwise, any license or right to use any of the trademarks displayed herein. Misuse of any trademarks or any other content in this manual is strictly prohibited. Funai shall aggressively enforce its intellectual property rights to the fullest extent of the law.

A91N3UH/N4UH/70UH/71UH/N1UH/N0UH/N5UH/N6UH/N8UT/N9UT/NCUT/NBUT

A9AN3UH/N4UH/N0UH/N5UH/N6UH/N1UH/NBUH/N9UT/NCUT

091020

IMPORTANT SAFETY NOTICE

Proper service and repair is important to the safe, reliable operation of all Funai Equipment. The service procedures recommended by Funai and described in this service manual are effective methods of performing service operations. Some of these service special tools should be used when and as recommended.

It is important to note that this service manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods may damage the equipment. It also is important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. Funai could not possibly know, evaluate and advice the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. Consequently, Funai has not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by Funai must first use all precautions thoroughly so that neither his safety nor the safe operation of the equipment will be jeopardized by the service method selected.

The LCD panel is manufactured to provide many years of useful life. Occasionally a few non active pixels may appear as a tiny spec of col This is not to be considered a defect in the LCD screen.

TABLE OF CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Standard Notes for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Cabinet Disassembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Electrical Adjustment Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

How to Initialize the LCD TV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Firmware Renewal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Block Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

Schematic Diagrams / CBA and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

Exploded Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1

Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-1

Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-1

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-1

SPECIFICATIONS

< TUNER / NTSC >

ANT. Input ---------------------- 75 Ω Unbal., F type

Description Condition Unit Nominal Limit

1. AFT Pull-In Range --- MHz ±2.3 ±2.1 TV.ch.4

2. Synchronizing Sens.

CA.ch.31 CA.ch.87

< TUNER / ATSC >

Description Condition Unit Nominal Limit

1. Received Freq. Range (-28dBm) --- kHz --- ±100

ch.4

2. ATSC Dynamic Range (min / max)

ch.10 ch.41

< LCD PANEL >

Description Condition Unit Nominal Limit

1. Native Pixel Resolution

2. Brightness (w / filter) --- cd/m

3. Viewing Angle

Horizontal

Vert ical

Horizontal

Vert ical

dBµ dBµ dBµ

dBm dBm dBm

pixels pixels

° °

18 18 18

---

1366

768

[LC195SLX, LC195EMX,

LC195SSX,

19MF339B/F7]

300

[22MF339B/F7,

LC225SSX]

330

-85 to 85

-80 to 80

20 20 23

-76/0

-76/+4

---

< VIDEO >

Description Condition Unit Nominal Limit

1. Over Scan

2. Color Temperature

3. Resolution (composite video)

Horizontal

Vert ical

--x y

Horizontal

Vert ical

% %

°K 12000

line line

5 5

0.272

0.278 400

350

5±5 5±5

--±3% ±3%

---

< AUDIO >

All items are measured across 8 Ω load at speaker output terminal with L.P.F.

Description Condition Unit Nominal Limit

1. Audio Output 10% Distortion (ATSC 0 dBfs)

2. Audio Distortion (NTSC) 500mW: Lch/Rch % 0.5/0.5 2.0/2.0

3. Audio Freq. Response (NTSC)

Lch/Rch W 3.0/3.0 2.8/2.8

6dB: Lch

6dB: Rch

1-1 FL9.0SP

Hz Hz

70 to 10 k 70 to 10 k

---

IMPORTANT SAFETY PRECAUTIONS

Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

Safety Precautions for LCD TV Circuit

1. Before returning an instrument to the

customer, always make a safety check of the

entire instrument, including, but not limited to, the following items:

a. Be sure that no built-in protective devices are

defective and have been defeated during servicing. (1) Protective shields are provided on this chassis to protect both the technician and the customer. Correctly replace all missing protective shields, including any removed for servicing convenience. (2) When reinstalling the chassis and/or other assembly in the cabinet, be sure to put back in place all protective devices, including but not limited to, nonmetallic control knobs, insulating fishpapers, adjustment and compartment covers/shields, and isolation resistor/capacitor networks. Do not operate this instrument or

permit it to be operated without all protective devices correctly installed and functioning. Servicers who defeat safety features or fail to perform safety checks may be liable for any resulting damage.

b. Be sure that there are no cabinet openings

through which an adult or child might be able to insert their fingers and contact a hazardous voltage. Such openings include, but are not limited to, (1) spacing between the Liquid Crystal Panel and the cabinet mask, (2) excessively wide cabinet ventilation slots, and (3) an improperly fitted and/or incorrectly secured cabinet back cover.

c. Antenna Cold Check - With the instrument AC

plug removed from any AC source, connect an electrical jumper across the two AC plug prongs. Place the instrument AC switch in the on position. Connect one lead of an ohmmeter to the AC plug prongs tied together and touch the other ohmmeter lead in turn to each tuner antenna input exposed terminal screw and, if applicable, to the coaxial connector. If the measured resistance is less than 1.0 megohm or greater than 5.2 megohm, an abnormality exists that must be corrected before the instrument is returned to the customer. Repeat this test with the instrument AC switch in the off position.

d. Leakage Current Hot Check - With the

instrument completely reassembled, plug the AC line cord directly into a 120 V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI) C101.1 Leakage Current for Appliances and Underwriters Laboratories (UL) 1410, (50.7). With the instrument AC switch first in the on position and then in the off position, measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the instrument (antennas, handle brackets, metal cabinet, screw heads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milli-ampere. Reverse the instrument power cord plug in the outlet and repeat the test.

READING SHOULD NOT BE ABOVE 0.5 mA

LEAKAGE

DEVICE

BEING

TESTED

TEST ALL EXPOSED METAL SURFACES

ALSO TEST WITH PLUG REVERSED USING AC ADAPTER PLUG AS REQUIRED

ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE INSTRUMENT TO THE CUSTOMER OR BEFORE CONNECTING THE ANTENNA OR ACCESSORIES.

2. Read and comply with all caution and safety-

related notes on or inside the receiver cabinet, on the receiver chassis, or on the Liquid Crystal Panel.

CURRENT

TESTER

EARTH GROUND

2-1 LTVN_ISP

3. Design Alteration Warning - Do not alter or add to the mechanical or electrical design of this TV receiver. Design alterations and additions, including, but not limited to circuit modifications and the addition of items such as auxiliary audio and/or video output connections, might alter the safety characteristics of this receiver and create a hazard to the user. Any design alterations or additions will void the manufacturer's warranty and may make you, the servicer, responsible for personal injury or property damage resulting therefrom.

4. Hot Chassis Warning a. Some TV receiver chassis are electrically

connected directly to one conductor of the AC power cord and maybe safety-serviced without an isolation transformer only if the AC power plug is inserted so that the chassis is connected to the ground side of the AC power source. To confirm that the AC power plug is inserted correctly, with an AC voltmeter, measure between the chassis and a known earth ground. If a voltage reading in excess of

1.0 V is obtained, remove and reinsert the AC power plug in the opposite polarity and again measure the voltage potential between the chassis and a known earth ground.

b. Some TV receiver chassis normally have 85V

AC(RMS) between chassis and earth ground regardless of the AC plug polarity. This chassis can be safety-serviced only with an isolation transformer inserted in the power line between the receiver and the AC power source, for both personnel and test equipment protection.

c. Some TV receiver chassis have a secondary

ground system in addition to the main chassis ground. This secondary ground system is not isolated from the AC power line. The two ground systems are electrically separated by insulation material that must not be defeated or altered.

5. Observe original lead dress. Take extra care to assure correct lead dress in the following areas: a. near sharp edges, b. near thermally hot parts-be sure that leads and components do not touch thermally hot parts, c. the AC supply, d. high voltage, and, e. antenna wiring. Always inspect in all areas for pinched, out of place, or frayed wiring. Check AC power cord for damage.

6. Components, parts, and/or wiring that appear to have overheated or are otherwise damaged should be replaced with components, parts, or wiring that meet original specifications. Additionally, determine the cause of overheating and/or damage and, if necessary, take corrective action to remove any potential safety hazard.

7. Product Safety Notice - Some electrical and mechanical parts have special safety-related characteristics which are often not evident from visual inspection, nor can the protection they give necessarily be obtained by replacing them with components rated for higher voltage, wattage, etc. Parts that have special safety characteristics are identified by a # on schematics and in parts lists. Use of a substitute replacement that does not have the same safety characteristics as the recommended replacement part might create shock, fire, and/or other hazards. The product's safety is under review continuously and new instructions are issued whenever appropriate. Prior to shipment from the factory, our products are strictly inspected to confirm they comply with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

2-2 LTVN_ISP

Precautions during Servicing

A. Parts identified by the # symbol are critical for

safety. Replace only with part number specified.

B. In addition to safety, other parts and assemblies

are specified for conformance with regulations applying to spurious radiation. These must also be replaced only with specified replacements. Examples: RF converters, RF cables, noise blocking capacitors, and noise blocking filters, etc.

C. Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

D. Use specified insulating materials for hazardous

live parts. Note especially:

1) Insulation Tape

2) PVC tubing

3) Spacers

4) Insulators for transistors.

E. When replacing AC primary side components

(transformers, power cord, etc.), wrap ends of wires securely about the terminals before soldering.

F. Observe that the wires do not contact heat

producing parts (heat sinks, oxide metal film resistors, fusible resistors, etc.)

G. Check that replaced wires do not contact sharp

edged or pointed parts.

H. When a power cord has been replaced, check that

5~6 kg of force in any direction will not loosen it.

I. Also check areas surrounding repaired locations. J. Use care that foreign objects (screws, solder

droplets, etc.) do not remain inside the set.

K. When connecting or disconnecting the internal

connectors, first, disconnect the AC plug from the AC supply outlet.

L. When installing parts or assembling the cabinet

parts, be sure to use the proper screws and tighten certainly.

2-3 LTVN_ISP

Safety Check after Servicing

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards.

1. Clearance Distance

When replacing primary circuit components, confirm specified clearance distance (d) and (d') between soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)

Table 1: Ratings for selected area

Chassis or Secondary Conductor

Primary Circuit

AC Line Voltage Region

110 to 130 V

Note: This table is unofficial and for reference only. Be

sure to confirm the precise values.

U.S.A. or

Canada

Clearance

Distance (d), (d’)

≥ 3.2 mm

(0.126 inches)

2. Leakage Current Test

Confirm the specified (or lower) leakage current between B (earth ground, power cord plug prongs) and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) is lower than or equal to the specified value in the table below.

Measuring Method: (Power ON)

Insert load Z between B (earth ground, power cord plug prongs) and exposed accessible parts. Use an AC voltmeter to measure across both terminals of load Z. See Fig. 2 and following table.

d' d

Fig. 1

Exposed Accessible Part

AC Voltmeter (High Impedance)

Earth Ground

Power Cord Plug Prongs

Fig. 2

Table 2: Leakage current ratings for selected areas

AC Line Voltage Region Load Z Leakage Current (i) Earth Ground (B) to:

110 to 130 V

Note: This table is unofficial and for reference only. Be sure to confirm the precise values.

U.S.A. or

Canada

0.15 µF CAP. & 1.5 kΩ

RES. Connected in parallel

2-4 LTVN_ISP

i ≤ 0.5 mA rms

Exposed accessible

parts

STANDARD NOTES FOR SERVICING

Circuit Board Indications

1. The output pin of the 3 pin Regulator ICs is indicated as shown.

Top View

Out

2. For other ICs, pin 1 and every fifth pin are indicated as shown.

Pin 1

3. The 1st pin of every male connector is indicated as shown.

Pin 1

Input

Bottom View

Pb (Lead) Free Solder

Pb free mark will be found on PCBs which use Pb free solder. (Refer to figure.) For PCBs with Pb free mark, be sure to use Pb free solder. For PCBs without Pb free mark, use standard solder.

Pb free mark

How to Remove / Install Flat Pack-IC

1. Removal

With Hot-Air Flat Pack-IC Desoldering Machine:

1. Prepare the hot-air flat pack-IC desoldering machine, then apply hot air to the Flat Pack-IC (about 5 to 6 seconds). (Fig. S-1-1)

Fig. S-1-1

2. Remove the flat pack-IC with tweezers while applying the hot air.

3. Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

4. Release the flat pack-IC from the CBA using tweezers. (Fig. S-1-6)

CAUTION:

1. The Flat Pack-IC shape may differ by models. Use an appropriate hot-air flat pack-IC desoldering machine, whose shape matches that of the Flat Pack-IC.

2. Do not supply hot air to the chip parts around the flat pack-IC for over 6 seconds because damage to the chip parts may occur. Put masking tape around the flat pack-IC to protect other parts from damage. (Fig. S-1-2)

3-1 TVN_SN

3. The flat pack-IC on the CBA is affixed with glue, so be careful not to break or damage the foil of each pin or the solder lands under the IC when removing it.

With Soldering Iron:

1. Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3)

CBA

Masking Tape

Tweezers

Hot-air Flat Pack-IC Desoldering Machine

Flat Pack-IC

Fig. S-1-2

Flat Pack-IC

Desoldering Braid

Soldering Iron

Fig. S-1-3

2. Lift each lead of the flat pack-IC upward one by one, using a sharp pin or wire to which solder will not adhere (iron wire). When heating the pins, use a fine tip soldering iron or a hot air desoldering machine. (Fig. S-1-4)

Sharp Pin

Fine Tip Soldering Iron

4. Release the flat pack-IC from the CBA using tweezers. (Fig. S-1-6)

Fig. S-1-4

3-2 TVN_SN

With Iron Wire:

1. Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3)

2. Affix the wire to a workbench or solid mounting point, as shown in Fig. S-1-5.

3. While heating the pins using a fine tip soldering iron or hot air blower, pull up the wire as the solder melts so as to lift the IC leads from the CBA contact pads as shown in Fig. S-1-5.

4. Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

5. Release the flat pack-IC from the CBA using tweezers. (Fig. S-1-6)

Note: When using a soldering iron, care must be

taken to ensure that the flat pack-IC is not being held by glue. When the flat pack-IC is removed from the CBA, handle it gently because it may be damaged if force is applied.

Hot Air Blower

2. Installation

1. Using desoldering braid, remove the solder from the foil of each pin of the flat pack-IC on the CBA so you can install a replacement flat pack-IC more easily.

2. The “●” mark on the flat pack-IC indicates pin 1. (See Fig. S-1-7.) Be sure this mark matches the pin 1 on the PCB when positioning for installation. Then presolder the four corners of the flat pack-IC. (See Fig. S-1-8.)

3. Solder all pins of the flat pack-IC. Be sure that none of the pins have solder bridges.

Example :

Pin 1 of the Flat Pack-IC is indicated by a " " mark.

Fig. S-1-7

To Solid Mounting Point

CBA

Tweezers

Iron Wire

Soldering Iron

Fig. S-1-5

Fine Tip Soldering Iron

Flat Pack-IC

Presolder

Flat Pack-IC

CBA

Fig. S-1-8

Fig. S-1-6

3-3 TVN_SN

Instructions for Handling Semiconductors

Electrostatic breakdown of the semi-conductors may occur due to a potential difference caused by electrostatic charge during unpacking or repair work.

1. Ground for Human Body

Be sure to wear a grounding band (1 MΩ) that is properly grounded to remove any static electricity that may be charged on the body.

2. Ground for Workbench

Be sure to place a conductive sheet or copper plate with proper grounding (1 MΩ) on the workbench or other surface, where the semi-conductors are to be placed. Because the static electricity charge on clothing will not escape through the body grounding band, be careful to avoid contacting semi-conductors with your clothing.

1MΩ

CBA

Grounding Band

1MΩ

CBA

Conductive Sheet or Copper Plate

3-4 TVN_SN

CABINET DISASSEMBLY INSTRUCTIONS

[LC195SLX, LC195EMX, LC195SSX, 19MF339B/F7]

1. Disassembly Flowchart

This flowchart indicates the disassembly steps for the cabinet parts, and the CBA in order to gain access to item(s) to be serviced. When reassembling, follow the steps in reverse order. Bend, route and dress the cables as they were.

[12] Junction-C CBA

[13] Junction-B CBA

[5] Jack Holder (A)

[6] Jack CBA

[15] Function CBA

[14] Junction-A CBA

[3] Jack Holder (D)

[4] Digital Main CBA Unit

[10] Speaker Holder (s)

[11] Speaker (s)

[1] Stand

Assembly

[2] Rear Cabinet

[7] Main CBA

[8] Stand Holder

[9] LCD Module Assembly

[16] Front Cabinet

Removal

Step/

Loc.

No.

Part

Fig.

Remove/*Unhook/

Unlock/Release/

No.

Unplug/Unclamp/

Note

Desolder

[6] Jack CBA

[7] Main CBA

Stand

[8]

Holder

D2D34(S-10), CN702,

*CN861A 10(S-11), *CN102,

*CN201, *CN862A,

*CN1001, *CN1002

D2 2(S-12), (S-13) ---

LCD

[9]

Module

D2 --------------- ---

Assembly Speaker

[10]

Holder(s)

D2 4(S-14) ---

[11] Speaker(s) D2 --------------- ---

[12]

[13]

[14]

Junction-C CBA

Junction-B CBA

Junction-A CBA

Desolder ---

D3 D2

Desolder ---

D3 D2

Desolder ---

---

2. Disassembly Method

Removal

Step/

Loc.

No.

Stand

[1]

Assembly Rear

[2]

Cabinet Jack

[3]

Holder(D)

Digital Main

[4]

CBA UnitD2D3

Jack

[5]

Holder(A)

Part

Remove/*Unhook/

Fig.

No.

Unlock/Release/

Unplug/Unclamp/

Desolder

D1 3(S-1) ---

D1 9(S-2), 2(S-3), 2(S-4) ---

D2 (S-5) ---

4(S-6), (S-7), 4(S-8), 2(H-1), *CN301, *CN302, *CN3902, Shield Box

D2 (S-9) ---

Note

---

[15]

[16]

↓

(1)

Function CBA

Front Cabinet

↓

(2)

2(S-15) ---

D2 --------------- ---

↓

(3)

↓

(4)

(5)

↓

Note:

(1) Order of steps in procedure. When reassembling,

follow the steps in reverse order. These numbers are also used as the Identification (location) No. of parts in figures.

(2) Parts to be removed or installed. (3) Fig. No. showing procedure of part location (4) Identification of parts to be removed, unhooked,

unlocked, released, unplugged, unclamped, or desoldered. P = Spring, L = Locking Tab, S = Screw, H = Hex Screw, CN = Connector * = Unhook, Unlock, Release, Unplug, or Desolder e.g. 2(S-2) = two Screws (S-2), 2(L-2) = two Locking Tabs (L-2)

(5) Refer to the following "Reference Notes in the

Ta bl e ."

4-1 A91N3DC

[2] Rear Cabinet

[1] Stand Assembly

(S-2)

(S-3)

(S-2)

(S-3)

(S-2)

(S-4)

(S-2)

(S-1)

Fig. D1

4-2 A91N3DC

[16] Front Cabinet

[14] Junction-A CBA

[15] Function CBA

[4] Digital Main CBA Unit

(S-8)

[3] Jack Holder(D)

(S-5)

[11] Speaker(s)

(S-14)

[10] Speaker Holder(s)

[13] Junction-B CBA

[12] Junction-C CBA

(S-15)

(S-14)

[9] LCD Module Assembly

[8] Stand Holder

(S-11)

[7] Main CBA

(S-13)

Shield Box

[6] Jack CBA

(S-12)

(S-10)

(H-1)

(S-9)

[5] Jack Holder(A)

(S-10)

(S-11)

(S-6)

(S-7)

(S-6)

(S-11)

Fig. D2

4-3 A91N3DC

TV Cable Wiring Diagram

To LCD Module Assembly

Main CBA

To LCD Module Assembly

Digital Main CBA Unit

CN862B

CN1001

CN1002

CN862A

AC CORD

Junction-B CBA

CL862

To Speaker

CN201

CN301

CN302

CN702

CN102

Junction-A CBA

CN101 CN101A

CN861B

CN3902

CN3701

CN3702

Jack CBA

CN701

CN861A

Junction-C CBA

CL861

Function CBA

CN101B

4-4 A91N3DC

To Speaker

Fig. D3

CABINET DISASSEMBLY INSTRUCTIONS

[22MF339B/F7, LC225SSX]

1. Disassembly Flowchart

[12] Junction-C CBA

[13] Junction-B CBA

[5] Jack Holder (A)

[6] Jack CBA

[15] Function CBA

[14] Junction-A CBA

[3] Jack Holder (D)

[4] Digital Main CBA Unit

[10] Speaker Holder (s)

[11] Speaker (s)

[1] Stand

Assembly

[2] Rear Cabinet

[7] Main CBA

[8] Stand Holder

[9] LCD Module Assembly

[16] Front Cabinet

Removal

Step/

Loc.

No.

Part

Fig.

Remove/*Unhook/

Unlock/Release/

No.

Unplug/Unclamp/

Note

Desolder

10(S-11), *CN102,

[7] Main CBA

*CN201, *CN862A,

*CN1550, *CN1650, *CN1750

Stand

[8]

Holder

D2 2(S-12), (S-13) ---

LCD

[9]

Module

D2 --------------- ---

Assembly Speaker

[10]

Holder(s)

D2 4(S-14) ---

[11] Speaker(s) D2 --------------- ---

[12]

[13]

[14]

[15]

Junction-C CBA

Junction-B CBA

Junction-A CBA

Function CBA

Desolder ---

D3 D2

Desolder ---

D3 D2

Desolder ---

D3 D2

2(S-15) ---

---

2. Disassembly Method

Removal

Step/

Loc.

Part

No.

Stand

[1]

Assembly Rear

[2]

Cabinet Jack

[3]

Holder(D)

Digital Main

[4]

CBA UnitD2D3

Jack

[5]

Holder(A)

[6] Jack CBA

Remove/*Unhook/

Fig.

No.

Unlock/Release/

Unplug/Unclamp/

Desolder

D1 3(S-1) ---

D1 9(S-2), 3(S-3), 3(S-4) ---

D2 (S-5) ---

4(S-6), (S-7), 4(S-8), 2(H-1), *CN301, *CN302, *CN3902, Shield Box

D2 (S-9) ---

D2D34(S-10), CN702,

*CN861A

Note

---

Front

[16]

↓

(1)

Cabinet

↓

(2)

D2 --------------- ---

↓

(3)

↓

(4)

(5)

↓

Note:

(1) Order of steps in procedure. When reassembling,

follow the steps in reverse order. These numbers are also used as the Identification (location) No. of parts in figures.

(2) Parts to be removed or installed. (3) Fig. No. showing procedure of part location (4) Identification of parts to be removed, unhooked,

(5) Refer to the following "Reference Notes in the

Ta bl e ."

4-5 A9170DC

(S-2)

(S-3)

(S-2)

[2] Rear Cabinet

[1] Stand Assembly

(S-4)

(S-2)

(S-1)

Fig. D1

4-6 A9170DC

[4] Digital Main CBA Unit

[3] Jack Holder(D)

[16] Front Cabinet

[11] Speaker(s)

(S-14)

[13] Junction-B CBA

[14] Junction-A CBA [15] Function CBA

[12] Junction-C CBA

(S-15)

(S-14)

[10] Speaker Holder(s)

[9] LCD Module Assembly

(S-8)

(S-12)

(S-13)

Shield Box

(H-1)

[6] Jack CBA

(S-5)

(S-6)

(S-7)

(S-6)

[5] Jack Holder(A)

(S-9)

(S-10)

(S-11)

[8] Stand Holder

[7] Main CBA

(S-11)

Fig. D2

4-7 A9170DC

TV Cable Wiring Diagram

To LCD Module Assembly

Main CBA

To LCD Module Assembly

Digital Main CBA Unit

CN862B

CN1550

CN1650

CN1750

CN862A

Junction-B CBA

CL862

To Speaker

AC CORD

CN201

CN301

CN302

CN702

CN102

Junction-A CBA

CN101 CN101A

CN861B

CN3902

CN3701

CN3702

Jack CBA

CN701

CN861A

Junction-C CBA

CL861

Function CBA

CN101B

4-8 A9170DC

To Speaker

Fig. D3

ELECTRICAL ADJUSTMENT INSTRUCTIONS

General Note: “CBA” is abbreviation for “Circuit Board Assembly.”

Note: Electrical adjustments are required after

replacing circuit components and certain mechanical parts. It is important to perform these adjustments only after all repairs and replacements have been completed. Also, do not attempt these adjustments unless the proper equipment is available.

Test Equipment Required

1. NTSC Pattern Generator (Color Bar W/White Window, Red Color, Dot Pattern, Gray Scale, Monoscope, Multi-Burst)

2. Remote control unit

3. Color Analyzer

How to make the Service remote control unit: [LC195SLX, LC195EMX]

Cut “A” portion of the attached remote control unit as shown in Fig. 1.

service button (There is a button under the plastic housing.)

[LC225SSX, LC195SSX]

Cut “A” portion of the attached remote control unit as shown in Fig. 3.

service button

Fig. 3

How to set up the service mode:

Service mode:

1. Use the service remote control unit.

2. Turn the power on.

3. Press the service button on the service remote control unit. The following screen appears.

"*" differs depending on the models.

Code :

***********-***

Pic code :

**-***-**-*****-***

MIPS :

Push 0key

Fig. 1

[22MF339B/F7, 19MF339B/F7]

Cut “A” portion of the attached remote control unit as shown in Fig. 2.

service button (There is a button under the plastic housing.)

Fig. 2

Tuner :

****-*****-**** safety_Non

Safety :

5-1 FL9.0EA

1. Purity Check Mode

2. VCOM Adjustment

This mode cycles through full-screen displays of red, green, blue, and white to check for non-active pixels.

1. Enter the Service mode.

2. Each time pressing [7] button on the service remote control unit, the display changes as follows.

Purity Check Mode

White mode

[7] button

Black mode

[7] button

Red mode

[7] button

Green mode

[7] button

Blue mode

Test Point Adj. Point

Screen

[CHANNEL UP/DOWN ]

buttons

M. EQ. Spec.

Color analyzer See below

Figure

To avoid interference from ambinent light, this adjustment should be performed in a dark room.

Perpendicularity

L = 3 cm

Color Analyzer

1. Operate the unit for more than 20 minutes.

2. Set the color analyzer and bring the optical receptor to the center on the LCD-Panel surface after zero point calibration as shown above. Note: The optical receptor must be set perpendicularly to the LCD Panel surface.

3. Enter the Service mode.

4. Press [3] button on the service remote control unit.

5. Press [CHANNEL UP/DOWN] buttons on the service remote control unit so that the color analyzer value becomes minimum.

[7] button

White 20% mode

Note:

When entering this mode, the default setting is White mode.

5-2 LC7NEA

The white balance adjustment should be performed when replacing the LCD Panel or Digital CBA.

3. White Balance Adjustment

Purpose: To mix red, green and blue beams correctly

for pure white. Symptom of Misadjustment: White becomes bluish

or reddish.

Test Point

Screen

Adj. Point Mode Input

[VOLUME

DOWN]

button

[VIDEO1]

C/D

M. EQ. Spec.

White Raster

(APL 70%)

(APL 40%)

5. [CUTOFF] Press [1] button to select “COR” for Red Cutoff adjustment. Press [3] button to select “COB” for Blue Cutoff adjustment.

[DRIVE]

Press [4] button to select “DR” for Red Drive adjustment. Press [6] button to select “DB” for Blue Drive adjustment.

6. In each color mode, press [CHANNEL UP/DOWN] buttons to adjust the values of color.

7. Adjust Cutoff and Drive so that the color temperature becomes 12000°K (x

0.272 / y

0.278 ±0.005).

Pattern Generator,

Color analyzer

x= 0.272 ± 0.005 y= 0.278 ± 0.005

Figure

To avoid interference from ambinent light, this adjustment should be performed in a dark room.

Perpendicularity

L = 3 cm

INPUT: WHITE 70%, 40%

Color Analyzer

1. Operate the unit for more than 20 minutes.

2. Input the White Raster(70%=70IRE, 40%=40IRE).

INPUT SIGNAL

0IRE 0IRE

Low

Hight

Light

100IRE

40%=40IRE

70%=70IRE

100IRE

3. Set the color analyzer to the CHROMA mode and bring the optical receptor to the center on the LCD-Panel surface after zero point calibration as shown above. Note: The optical receptor must be set perpendicularly to the LCD Panel surface.

4. Enter the Service mode. Press [VOLUME DOWN] button on the service remote control unit and select “C/D” mode.

5-3 LC7NEA

HOW TO INITIALIZE THE LCD TV

The purpose of initialization is to place the set in a new out of box condition. The customer will be prompted to select a language and program channels after the set has been initialized. To put the program back at the factory-default, initialize the LCD TV using the following procedure.

1. Turn the power on.

2. To enter the service mode, press the service button on the service remote control unit.

- To cancel the service mode, press [POWER]

button on the service remote control unit.

3. Press [INFO] button on the service remote control unit to initialize the LCD television.

4. "INITIALIZED" will appear in the upper right of the screen. "INITIALIZED" color will change to green from red when initializing is complete.

6-1 A91F3INT

FIRMWARE RENEWAL MODE

Equipment Required

a. USB memory b. Remote Control Unit

Firmware Update Procedure

Note: There are two states (the User Upgrade and

the Factory Upgrade) in firmware update.

User Upgrade Upgrade the firmware only.

The setting values are not initialized.

Factory upgrade Upgrade the firmware and

initialize the setting values.

The identification of User Upgrade and Factory Upgrade are done by the filename.

1. Turn the power off and unplug the AC Cord.

2. Insert the USB memory to the USB port as shown below.

Rear Cabinet

USB port

Note: If the above screen isn’t displayed, repeat from

step 1.

The appearance shown in *1 is described as follows.

Appearance State

Downloading...

Writing...

Downloading the firmware from the USB memory.

Writing the downloaded firmware in flash memory.

Checking... Checking the new firmware.

5. When the firmware update is completed, the following will appear on the screen.

Software Upgrade

The software upgrade is completed. Remove USB storage device, unplug and replug power code.

USB Memory

3. Plug the AC cord in the wall outlet and turn the power on.

4. The update will start and the following will appear on the screen.

Software Upgrade

Software upgrade in progress. Please wait. Do not remove the USB device or turn the TV off while upgrade is in progress.

Unplug the AC cord and kindly remove the USB memory from the USB port. Plug the AC cord in the wall outlet again and turn the power on.

Note:

When the Factory Upgrade is used, after restarting TV, shift to initial screen menu in service mode. "INITIALIZED" will appear on the upper right of the screen. "INITIALIZED" color will change to green from red when initializing is complete.

Downloading...

7-1 A91N3FW

[ Power Supply Section ]

FLOW CHART NO.1

The power cannot be turned on.

TROUBLESHOOTING

Is the fuse (F601) normal?

Ye s

Is normal state restored when once unplugged power cord is plugged again several seconds?

Ye s

Is the INV+31V line voltage normal?

Ye s

Check each rectifying circuit of the secondary circuit and service it if defective.

FLOW CHART NO.2

The fuse blows out.

Check the presence that the primary component is leaking or shorted and service it if defective.

After servicing, replace the fuse.

FLOW CHART NO.3

When the output voltage fluctuates.

See FLOW CHART No.2 <The fuse blows out.>

Check if there is any leak or short-circuiting on the primary circuit component, and service it if defective. (D601, D602, D603, D604, Q601, Q602, T601)

Check the presence that the rectifying diode or circuit is shorted in each rectifying circuit of secondary side, and service it if defective.

Does the photocoupler circuit on the secondary side operate normally?

Ye s

Check IC601, D608, D610 and their periphery, circuit and service it if defective.

FLOW CHART NO.4

When buzz sound can be heard in the vicinity of power circuit.

Check if there is any short-circuit on the rectifying diode and the circuit and service it if defective. (IC631, Q201, Q205, Q206, Q634, Q635, Q636, Q637, Q640, Q641, Q643, D631, D632, D636, D638, D639, D641, D643)

FLOW CHART NO.5

INV+31V is not output.

Is approximately +31V voltage supplied to the cathode of D632?

Ye s

Check if there is any leak or short-circuit on the loaded circuit, and service it if defective.

Check IC601, D633, Q631 and their periphery circuit, and service it if defective.

in each rectifying circuit of the secondary side,

Check C632, D632, D633 and their periphery circuit, and service it if defective.

8-1 A91N3TR

FLOW CHART NO.6

PANEL+24.5V is not output.

Is approximately +30V voltage supplied to the collector of Q205?

Ye s

Check Q202, Q203, D203, P-ON-H1 line and their periphery circuit, and service it if defective.

FLOW CHART NO.7

PANEL+13V is not output.

Is approximately +15V voltage supplied to the collector of Q201?

Ye s

Is approximately +13V voltage supplied to the base of Q201?

Ye s

Replace Q201.

FLOW CHART NO.8

P-ON+7V is not output.

See FLOW CHART No.5

Check C631, D631, D668 and their periphery circuit, and service it if defective.

Check Q202, Q203, D201, D202, D210 and their periphery circuit, and service it if defective.

Is approximately +7V voltage supplied to the cathode of D641?

Ye s

Check if there is any leak or short-circuit on the loaded circuit, and service it if defective.

FLOW CHART NO.9

P-ON+5V is not output. (PANEL+13V is outputted normally.)

Is approximately +6.8V voltage supplied to the collector of Q635?

Ye s

Is approximately +6V voltage supplied to the base of Q635 and the base of Q636?

Ye s

Replace Q635 and Q636.

Check C641, D641 and their periphery circuit, and service it if defective.

See FLOW CHART No.8

Check D659 and their periphery circuit, and service it if defective.

8-2 A91N3TR

FLOW CHART NO.10

TUNER+5V is not output. (PANEL+13V is outputted normally.)

Is approximately +6.7V voltage supplied to the collector of Q637?

Ye s

Is approximately +6V voltage supplied to the base of Q637?

Ye s

Replace Q637.

FLOW CHART NO.11

P-ON+3V is not output.

Is approximately +3V voltage supplied to the cathode of D638?

Ye s

Check if there is any leak or short-circuit on the loaded circuit, and service it if defective.

FLOW CHART NO.12

P-ON+3.3V(PANEL+3.3V) is not output.

See FLOW CHART No.8

Check D659 and their periphery circuit, and service it if defective.

Check C638, D638 and their periphery circuit, and service it if defective.

Is approximately +5V voltage supplied to the cathode of D639?

Ye s

Is the "H" signal (approximately +3.5V) inputted to base of Q640?

Ye s

Replace Q640.

FLOW CHART NO.13

P-ON+9V is not output. (PANEL+13V is outputted normally.)

Is approximately +13V voltage supplied to the collector o

Is approximately +10V voltage supplied to the base of Q641?

Replace Q641.

f Q641?

Ye s

the

Check C639, D639 and their periphery circuit, and service it if defective.

Check Q638, Q639, P-ON-H2 line and their periphery circuit, and service it if defective.

Check C643, D643 and their per and service it if defective.

Check D666 and their periphery circuit, and service it if defective.

iphery circuit,

8-3 A91N3TR

FLOW CHART NO.14

AL+3.3V is not output.

Is approximately +34V voltage supplied to the collector of Q634?

Ye s

Is approximately +5V voltage supplied to Pin(1) of IC631?

Ye s

Replace IC631.

FLOW CHART NO.15

LCD-7.1V is not output.

Is approximately -9V voltage supplied to the Anode of D636?

Ye s

Is approximately -8V voltage supplied to the base of Q206?

Ye s

Replace Q206.

See FLOW CHART No.5

Check Q634, D650 and their periphery circuit, and service it if defective.

Check C636, D636, D637 and their periphery circuit, and service it if defective.

Check Q202, Q203, D204, P-ON-H1 line and thei periphery circuit, and service it if defective.

8-4 A91N3TR

[ Video Signal Section ]

FLOW CHART NO.1

The key operation is not functioning.

Are the contact point and installation state of the key switches (SW104~SW109) normal?

Ye s

When pressing each switches (SW104~SW109) do the voltage of Pin(29) of CN302 increase?

Ye s

Replace Digital Main CBA Unit.

FLOW CHART NO.2

No operation is possible from the remote control unit.

Operation is possible from the remote control unit.

Is 3.3V voltage supplied to Pin(2) terminal of the remote control receiver (RS101)?

Ye s

Is the "L" pulse sent out Pin(1) terminal of remote control receiver (RS101) when the infrared remote

control is activated?

Ye s

Is the "L" pulse supplied to Pin(25) of CN301?

Ye s

Replace Digital Main CBA Unit.

Re-install the switches (SW104~SW109) correctly or replace the poor switch.

Check the switches (SW104~SW109) and their periphery, and service it if defective.

Check AL+3.3V line and service it if defective.

Replace the remote control receiver(RS101) or the remote control unit.

Check the line between Pin(1) terminal of remote control receiver(RS101) and Pin(25) of CN301, and service it if defective.

FLOW CHART NO.3

Picture does not appear normally.(Video input)

Are the video signal inputted to Pin(4) of CN302?

Ye s

Replace Digital Main CBA Unit or LCD Module Assembly.

Check the line between Pin(4) of CN302 and JK752, and service it if defective.

8-5 A91N3TR

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