Sylvania LD370SS8 M Schematic

SERVICE MANUAL

37″ LCD TV/DVD

LD370SS8 M

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 color. This is not to be considered a defect in the LCD screen.

Manufactured under license from Dolby Laboratories. Dolby and the double-D symbol are trademarks of Dolby Laboratories.

TABLE OF CONTENTS

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

Laser Beam Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Standard Notes for Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Cabinet Disassembly Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Electrical Adjustment Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

How to Initialize the LCD TV/DVD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Firmware Renewal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

Schematic Diagrams / CBA's and Test Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1

Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1

System Control Timing Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-1

Lead Identifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-1

Exploded Views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-1

Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-1

Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-1

SPECIFICATIONS

< LCD TV Section >

< TUNER / NTSC >

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

Description Condition Unit Nominal Limit

1. AFT Pull-in Range --- MHz ±2.3 ±2.1

2. Syncronizing Sens.

TV.ch.4 CA.ch.31 CA.ch.87

dBµ dBµ dBµ

---

20 20 23

< TUNER / ATSC >

Description Condition Unit Nominal Limit

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

2. ATSC Dynamic Range (min / max)

ch.4 ch.10 ch.41

dBm dBm dBm

---

-76/0

< LCD PANEL >

Description Condition Unit Nominal Limit

1. Native Pixel Resolusion

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

3. Viewing Angle

Horizontal

Vert ical

Horizontal

Vert ical

pixels pixels

° °

1366

768

320 ---

-85 to 85

---

< 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

6 6

0.272

0.278 400

350

6±5 6±5

--±10% ±10%

---

< AUDIO >

All items are measured across 8 Ω load at speaker output terminal with L.P.F. / Video1 Input.

Description Condition Unit Nominal Limit

1. Audio Output Power -6dB: Lch/Rch W 10.0/10.0 9.0/9.0

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

3. Audio Freq. Response (NTSC)

6dB: Lch

6dB: Rch

1-1 A74F0SP

Hz Hz

70 to 10 k 70 to 10 k

---

< DVD >

Description Condition Unit Nominal Limit

1. Horizontal Resolution (TDV-540 TIT.2 CHP.16) --- Line 350 330

2. Video S/N (TDV-540 TIT.2 CHP.6) --- dB 60 55

3. Audio Distortion (LPCM 48 kHz, W/LPF) (PTD 1-NOR TIT.1 CHP.1)

4. Audio freq. response (LPCM 48 kHz) (PTD 1-NOR TIT.1 CHP.5 -- 10)

5. Audio S/N (LPCM 48 kHz, W/LPF, A-WTD) (PTD 1-NOR TIT.1 CHP.1 -- 2)

Note: Nominal specifications represent the design specifications. All units should be able to approximate these.

Some will exceed and some may drop slightly below these specifications. Limit specifications represent the absolute worst condition that still might be considered acceptable. In no case should a unit fail to meet limit specifications.

L, 20 Hz

R, 20 Hz

L, 20 kHz

R, 20 kHz

% 0.03 0.07

dB 0 +4/-5

dB 85 75

1-2 A74F0SP

LASER BEAM SAFETY PRECAUTIONS

This DVD player uses a pickup that emits a laser beam.

Do not look directly at the laser beam coming from the pickup or allow it to strike against your skin.

The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep your eyes at least 30 cm away from the pickup lens when the diode is turned on. Do not look directly at the laser beam.

CAUTION: Use of controls and adjustments, or doing procedures other than those specified herein, may result in hazardous radiation exposure.

Drive Mechanism Assembly

Laser Beam Radiation

Laser Pickup

Turntable

WHEN OPEN. DO NOT

CAUTION

LASER RADIATION

STARE INTO BEAM.

Location: Top of DVD mechanism.

2-1 E7NLSP

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

3-1 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.

3-2 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.

3-3 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

3-4 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.

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)

Pin 1

Instructions for Connectors

1. When you connect or disconnect the FFC (Flexible Foil Connector) cable, be sure to first disconnect the AC cord.

2. FFC (Flexible Foil Connector) cable should be inserted parallel into the connector, not at an angle.

FFC Cable

Connector

CBA

* Be careful to avoid a short circuit.

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

4-1 TVDVDN_SN

around the flat pack-IC to protect other parts from damage. (Fig. S-1-2)

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.

Hot-air Flat Pack-IC Desoldering

CBA

Machine

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)

Flat Pack-IC

Desoldering Braid

Soldering Iron

Fig. S-1-3

Masking Tape

Tweezers

Flat Pack-IC

Fig. S-1-2

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

4-2 TVDVDN_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 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

4-3 TVDVDN_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

4-4 TVDVDN_SN

CABINET DISASSEMBLY INSTRUCTIONS

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.

[23] IR Sensor CBA

[16] Jack Holder(A)

[17] Jack CBA

[22] LED CBA

[12] Jack Holder(D)

[13] Shield Box

[14] Digital Sub CBA

[15] Digital Main CBA Unit

[18] Inverter CBA[24] Speaker(s)

[4] Rear Cabinet [6] DVD Cover

[7] DVD Main CBA Unit

[8] DVD Mechanism

[9] DVD Holder

[10] Chassis Bracket

[19] Panel Holder

[21] LCD Module Assembly

[25] Front Cabinet

[5] Function CBA

[1] Stand Base Plate

[2] Stand Hinge

[3] Stand Cover

[11] Power Supply CBA

[20] T-CON CBA

2. Disassembly Method

Removal

Step/

Loc.

Part

No.

Stand Base

[1]

Plate Stand

[2]

Hinge Stand

[3]

Cover Rear

[4]

Cabinet Function

[5]

CBA

[6] DVD Cover D1 4(S-7) ---

DVD Main

[7]

CBA UnitD2D6

DVD

[8]

Mechanism

Remove/*Unhook/

Fig.

No.

Unlock/Release/

Unplug/Unclamp/

Note

Desolder

D1 4(S-1), 6(S-2), 5(S-3) ---

D1 --------------- ---

D1 11(S-4), 4(S-5) ---

3(S-6), *CN3002 ---

(S-8), *CN201, *CN301, *CN401, *CN601, *CN801

D2 4(S-9)

2 3 4 5

Removal

Step/

Loc.

No.

Part

Remove/*Unhook/

Fig.

No.

Unlock/Release/

Unplug/Unclamp/

Note

Desolder

[9] DVD Holder D2 4(S-10) ---

Chassis

[10]

Bracket

Power

[11]

Supply CBA

Jack

[12]

Holder(D)

[13] Shield Box D3

Digital Sub

[14]

CBA Digital Main

[15]

CBA UnitD3D6 Jack

[16]

Holder(A)

[17] Jack CBA

D3 16(S-11) ---

4(S-12), *CN101B,

*CN501, *CN801,

*CN802, *CN3010, *CN3014, *CN3017

(S-13), 2(S-14),

2(S-15), (N-1), Earth Plate

5(S-16), *CN3001, Shield Plate

*CN1 ---

*CN3018, *CN3023 ---

D4 (S-17) ---

5(S-18) ---

8(S-19), *CN1050, *CN1100, *CN1150,

*CN1200, *CN1250,

*CN1300, *CN1350,

[18]

Inverter CBA

*CN1400

Panel

[19]

[20]

Holder T-CON

CBA

D4 8(S-20), 2(S-21) ---

D5D64(S-22), *CN9001,

*CN9002, *CN9005

LCD

[21]

Module

D5 8(S-23) ---

Assembly

[22] LED CBA

IR Sensor

[23]

CBA

2(S-24), *CN104 ---

D6 D5

2(S-25) ---

[24] Speaker(s) D5 8(S-26) ---

Front

[25]

↓

(1)

Cabinet

↓

(2)

D5 --------------- ---

↓

(3)

↓

(4)

---

↓

(5)

5-1 A74GADC

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,

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

Table."

Reference Notes

1. CAUTION 1: Electrostatic breakdown of the laser diode in the optical system block may occur as a potential difference caused by electrostatic charge accumulated on cloth, human body etc., during unpacking or repair work. To avoid damage of pickup follow next procedures.

1) Short the three short lands of FPC cable with

solder before removing the FFC cable (CN201) from it. If you disconnect the FFC cable (CN201), the laser diode of pickup will be destroyed. (Fig. D2)

2) Disconnect Connectors (CN301), (CN401),

(CN601) and (CN801). Remove Screw (S-8) and remove the DVD Main CBA Unit. (Fig. D2)

2. Reassembly Notes of New DVD Mechanism: a. To remove the Chassis Cover, remove two

screws A as shown in Fig. D2.

b. To avoid damage of the pickup unit (laser

diode), confirm that the three short lands (either of two places) are shorted out by soldering between them as shown in View A in Fig. D2.

c. Connect the FFC cables of the new DVD

Mechanism to the three connectors (CN201, CN301, CN801) on the DVD Main CBA Unit.

d. After confirming that the FFC cables are

securely connected to the three connectors, remove the solder from the three short lands. If the solder is not removed, the laser diode will not light and it will not be possible to read discs.

e. Insert the pin A on the Chassis Cover into the

hole A on the Main Chassis as shown in Fig. D2. Then tighten two screws A to install the Chassis Cover.

3. CAUTION 2: When reassembling, confirm the FFC cable (CN201) is connected completely. Then remove the solder from the three short lands of FPC cable. (Fig. D2)

4. How to eject a disc in emergency Press and hold [EJECT] on the unit for more than 5 seconds.

5. How to eject manually

1) Remove the Rear Cabinet and DVD Cover.

2) To remove the DVD Main CBA Unit, remove a

screw (S-8) in Fig. D2. Do not disconnect connectors.

3) To remove the Chassis Cover, remove two

screws A as shown in Fig. D2.

4) Remove a disc

5-2 A74GADC

(S-4)

[4] Rear Cabinet

(S-4)

(S-7)

[6] DVD Cover

[5] Function CBA

[1] Stand Base Plate

(S-4)

(S-6)

[3] Stand Cover

[2] Stand Hinge

(S-4)

(S-1)

(S-2)

(S-5)

(S-4)

(S-2)

(S-3)

(S-2)

Fig. D1

5-3 A74GADC

(S-8)

[7] DVD Main CBA Unit

(S-9)

[8] DVD Mechanism

(S-10)

[9] DVD Holder

Remove two screws A, then short the three short lands by soldering as shown in View for A.

Chassis Cover

FPC Cable

Either of two places

View for A

Hole A

Pin A

Screws A

Main Chassis

Fig. D2

5-4 A74GADC

[15] Digital Main CBA Unit

[14] Digital Sub CBA

[11] Power Supply CBA

[12] Jack Holder(D)

Earth Plate

(S-15)

(S-14)

(S-13)

(N-1)

[13] Shield Box

(S-12)

(S-8)

(S-12)

(S-16)

Shield Plate

(S-11)

[10] Chassis Bracket

Fig. D3

5-5 A74GADC

(S-20)

(S-21)

(S-20)

[18] Inverter CBA

[19] Panel Holder

[17] Jack CBA

(S-20)

(S-21)

(S-14)

(S-19)

[16] Jack Holder (A)

(S-17)

(S-18)

(S-19)

Fig. D4

5-6 A74GADC

[25] Front Cabinet

[21] LCD Module Assembly

[24] Speaker

(S-26)

(S-24)

[22] LED CBA

(S-25)

[23] IR Sensor CBA

[24] Speaker

(S-26)

(S-23)

(S-22)

[20] T-CON CBA

Fig. D5

5-7 A74GADC

TV Cable Wiring Diagram

DVD Mechanism

To LCD Module Assembly

Inverter CBA

CN1300

CN1250

CN1200

DVD Main CBA Unit

CN201

CN601

Function CBA

CN102

CN301

CN801

CN401

CN552

To LCD Module Assembly

CN9002 CN9001

CN9003

T-CON CBA

CN3002

CN3001

CN3025

CN9005

CN3023

Jack CBA

CN7501

Digital Main CBA Unit

CN3018

Digital Sub CBA

CN1

CN1150

CN1100

CN1050

CN1350

CN1400

IR Sensor CBA

CN001

CN103

CN501

AC CORD

LED CBA

CN104

CN3010 CN3014

CN301 CN302

CN601

CN201

CN3017

Power Supply CBA

CN303

To Speaker

CN802

CN801

CN202

CN101B

Fig. D6

5-8 A74GADC

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. DC Voltmeter

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

3. Remote control unit

4. Color Analyzer

How to make the Service remote control unit:

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

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.

Ver :

***********************

Boot

Push 0 key

System

Push 0 key

Pic Ver :

*********************** ***********************

Picture :

Push 0 key

Submicon Ver :

******

service button

Fig. 1

6-1 A74F0EA

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

Red mode

[7] button

Green mode

[7] button

Blue mode

Note:

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

*This adjustment is required when reparing T-CON CBA.

Test Point

Screen

Adj. Point

[CH. o/p]

buttons

M. EQ. Spec.

Color analyzer

See below

Figure

It carries out in a darkroom.

Perpendicularity

L = 3 cm

Color Analyzer

Note: Use the service remote control unit

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 remote control unit.

5. Press [CH. o / p] buttons on the remote control unit so that the color analyzer value becomes minimum.

6-2 A74F0EA

The following adjustment normally are not attempted in the field. Only when replacing the LCD Panel then adjust as a preparation.

3. White Balance Adjustment

*This adjustment is required when reparing T-CON CBA.

Purpose: To mix red, green and blue beams correctly for pure white.

Symptom of Misadjustment: White becomes bluish or reddish.

Test Poi nt

Screen

Adj. Point Mode Input

[CH. o/p]

buttons

M. EQ. Spec.

[RF/VIDEO1, 2]

C/D

White Raster

(APL 70%)

(APL 25%)

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

[DRIVE]

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

6. In each color mode, press [CH. o / p] buttons to adjust the values of color.

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

0.278 ±0.005).

0.272 / y

Pattern Generator,

Color analyzer

Figure

x= 0.272 ± 0.005 y= 0.278 ± 0.005

It carries out in a darkroom.

Perpendicularity

L = 3 cm

INPUT: WHITE 70%, 25%

1. Operate the unit for more than 20 minutes.

2. Input the White Raster(70%=70IRE, 25%=25IRE).

INPUT SIGNAL

Color Analyzer

25%=25IRE

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 [VOL. n] button on the remote control unit and select “C/D” mode.

70%=70IRE

6-3 A74F0EA

HOW TO INITIALIZE THE LCD TV/DVD

To put the program back at the factory-default, initialize the LCD TV/DVD using the following procedure.

< DVD Section >

1. Press [1], [2], [3], [4], and [INFO] buttons on the

remote control unit in that order. Fig. g appears on the screen.

" differs depending on the models.

*******

MODEL : *******

Version Region

: *.**

: *

EXIT: SELECTEEPROM CLEAR : CLEAR

Fig. g

" differs depending on the models.

*******

: *.**

: *

2. Press [CLEAR] button on the remote control unit.

Fig. h appears on the screen.

MODEL : *******

< LCD TV Section >

1. Turn the power on.

2. To enter the service mode, press the service button on the service remote control unit. (Refer to page 6-1.)

- To cancel the service mode, press [POWER]

button on the remote control unit.

3. Press [INFO] button on the 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 initialzing is complete.

EEPROM CLEAR : OK

EXIT: SELECTEEPROM CLEAR : CLEAR

Fig. h

When “OK” appears on the screen, the factory default will be set.

3. To exit this mode, press [CH. o / p] button to go to TV mode, or press [POWER] button to turn the power off.

7-1 A74F0INT

FIRMWARE RENEWAL MODE

1. Turn the power on and press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode. Then remove the disc.

2. To put the LCD TV/DVD into F/W version up mode, press [9], [8], [7], [6], and [SEARCH MODE] buttons on the remote control unit in that order. Fig. a appears on the screen.

" differs depending on the models.

*******

F/W Version Up Mode Model No : *******

Please insert a DISC

for F/W Version Up.

VERSION : *.**

EXIT: SELECT

Fig. a Version Up Mode Screen

3. Insert the disc for version up into the disc slot.

4. The LCD TV/DVD enters the F/W version up mode automatically. Fig. c appears on the screen. If you enter the F/W for different models, “Disc Error” will appear on the screen, then the disc will be ejected automatically.

" differ depending on the models.

*******

5. After programming is finished, the disc will be ejected automatically. Fig. e appears on the screen and the checksum will be shown in (*2).

" differ depending on the models.

*******

(*2)

F/W Version Up Mode

VERSION : ************.*** Completed

SUM : 7ABC

Model No : ******* VERSION : *.**

Fig. e Completed Program Mode Screen

At this time, no button is available.

6. Remove the disc.

7. Unplug the AC cord from the AC outlet. Then plug it again.

8. Press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode again.

9. Press [1], [2], [3], [4], and [INFO] buttons on the remote control unit in that order. Fig. g appears on the screen.

" differs depending on the models.

*******

(*1)

F/W Version Up Mode Model No : *******

VERSION : ************.*** Reading...

VERSION : *.**

Fig. c Programming Mode Screen

The appearance shown in (*1) of Fig. c is described as follows:

AppearanceNo. State

Reading... Sending files into the memory

Erasing... Erasing previous version data

Programming...

3 Writing new version data

MODEL : *******

Version Region

: *.**

: *

EXIT: SELECTEEPROM CLEAR : CLEAR

Fig. g

10.Press [CLEAR] button on the remote control unit. Fig. h appears on the screen.

" differs depending on the models.

*******

MODEL : *******

Version Region

: *.**

: *

EXIT: SELECTEEPROM CLEAR : CLEAR

EEPROM CLEAR : OK

Fig. h

When “OK” appears on the screen, the factory default will be set. Then the firmware renewal mode is complete.

11.To exit this mode, press [CH. o / p] button to go to TV mode, or press [POWER] button to turn the power off.

8-1 A74F0FW

FLOW CHART NO.1

The power cannot be turned on.

TROUBLESHOOTING

Is the fuse (F501) normal?

Ye s

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

Ye s

Is the +6.7V line voltage normal?

Ye s

Check each rectifying circuit of the secondary circuit and service it if de

FLOW CHART NO.2

The fuse blows out.

Check the prese is leaking or shorted and service it if defective.

After servicing, replace the fus

FLOW CHART NO.3

When the output voltage fluctuates.

nce that the primary component

fective.

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. (C601, D501, D502, D503, D504, Q601, Q602, T601)

Check the prese is shorted in each r and service it if de

nce that the rectifying diode or circuit

ectifying circuit of secondary side,

fective.

Does the photocoupler circuit on secondary side operate normally?

Check IC603, D603, D607 and their pe 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. (IC637, IC1601, Q632, Q637, Q638, Q D637, D640, D647, D1601, D1607)

FLOW CHART NO.5

+35V is not output.

Is approximately 35V voltage supplied to the cathode of D636?

Check if there is the loaded circuit, and service it if defective.

any leak or short-circuit on

the

Ye s

riphery,

Ye s

650, Q801, Q

Check IC603, D631, Q631 and their periphery, and service it if defective.

in each rectifying circuit of the secondar

1601, Q1603, Q1604, D632, D633, D

Check C647, D636 and their periphery circuit, and service it defective.

y side,

636,

9-1 A74GATR

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