Funai LCD-D3206, LCD-C3206, LCD-B3206, LCD-A3206 Service Manual

SERVICE MANUAL

32" COLOR LCD TELEVISION

LCD-A3206/LCD-B3206/

LCD-C3206/LCD-D3206

32″ COLOR LCD TELEVISION

LCD-A3206/LCD-B3206/

LCD-C3206/LCD-D3206

TABLE OF CONTENTS

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

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

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

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

How to Initialize the LCD Television. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

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

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Schematic Diagrams / CBA’s and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1

Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

Electrical Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1

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.

SPECIFICATIONS

< TUNER >

ANT. Input -----------------------75 ohm Unbal., F type Reference Level ---------------20 Vp-p (LCD Green Cathode) Test Input Signal---------------400 Hz 30% modulation

Description Condition Unit Nominal Limit

1. Intermediate Freq.

2. Color Killer Sens.

3. AFT Pull In Range (10 mV input) --- MHz ±2.4 ±2.1

Picture

Sound

CH-2 CH-10 CH-55

MHz MHz

dBµV dBµV dBµV

45.75

41.25

17 17 17

---

23 23 23

< LCD PANEL >

Description Condition Unit Nominal Limit

1. Number of Pixels

2. Brightness cd/m

3. Response Time (tr+tf) --- msec 25 ---

4. Support Color --- - 16.7 mil. (8 bit) ---

5. Viewing Angle

Horizontal

Ver ti ca l

Horizontal

Ver ti ca l

pixels pixels

° °

1366× 3

768

470 ---

-85 to 85

---

< VIDEO >

Description Condition Unit Nominal Limit

1. Over Scan

2. Color Temperature

3. Resolution

Horizontal

Ver ti ca l

--x y

Horizontal

Ver ti ca l

% %

°K

line line

5 5

12000

0.272

0.278

400 350

---

--±0.03 ±0.03

---

< 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 Power 10% THD: Lch/Rch W 5.0/5.0 4.5/4.5

2. Audio Distortion 500mW: Lch/Rch % 1.0/1.0 4.0/4.0

3. Audio Freq. Response

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.

6dB: Lch

6dB: Rch

Hz Hz

100 to 10 k 100 to 10 k

---

1-1 L5920SP

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 LCD module 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 230 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 LCD module.

3. Design Alteration Warning - Do not alter or add to the mechanical or electrical design of this LCD 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.

CURRENT

TESTER

EARTH GROUND

2-1 LTVP_ISP

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

1.0V 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 LTVP_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. Crimp type wire connector

The power transformer uses crimp type connectors which connect the power cord and the primary side of the transformer. When replacing the transformer, follow these steps carefully and precisely to prevent shock hazards. Replacement procedure

1) Remove the old connector by cutting the wires at a point close to the connector. Important: Do not re-use a connector (discard it).

2) Strip about 15 mm of the insulation from the ends of the wires. If the wires are stranded, twist the strands to avoid frayed conductors.

3) Align the lengths of the wires to be connected. Insert the wires fully into the connector.

4) Use the crimping tool to crimp the metal sleeve at the center position. Be sure to crimp fully to the complete closure of the tool.

L. When connecting or disconnecting the internal

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

M. When installing parts or assembling the cabinet

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

2-3 LTVP_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

AC Line Voltage Clearance Distance (d), (d’)

230 V

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

≥ 3mm(d)

≥ 6 mm(d’)

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.).

Chassis or Secondary Conductor

Primary Circuit

d' d

Exposed Accessible Part

AC Voltmeter (High Impedance)

Fig. 1

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.

Table 2: Leakage current ratings for selected areas

AC Line Voltage Load Z Leakage Current (i)

2kΩ RES.

Connected in

parallel

230 V

50kΩ RES.

Connected in

parallel

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

i≤0.7mA AC Peak

i≤2mA DC

i≤0.7mA AC Peak

i≤2mA DC

One side of

Power Cord Plug Prongs

One side of power cord plug

prongs (B) to:

Antenna terminals

A/V Input, Output

Fig. 2

RF or

2-4 LTVP_ISP

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. 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

Masking Tape

Tweezers

3-1 TVP_SN

Machine

Flat Pack-IC

Fig. S-1-2

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

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)

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.

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

To Solid Mounting Point

CBA

Hot Air Blower

Iron Wire

Soldering Iron

Fig. S-1-5

Fine Tip Soldering Iron

Flat Pack-IC

Tweezers

Fig. S-1-6

3-2 TVP_SN

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

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.

CBA

Presolder

Flat Pack-IC

Fig. S-1-8

1MΩ

CBA

Grounding Band

1MΩ

CBA

Conductive Sheet or Copper Plate

3-3 TVP_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.

[1] Stand Base Plate

[2] Stand Hinge

[18] Speaker (R)

[7] Jack Holder(D)

[9] Shield Box

[11] Digital Main CBA Unit

[3] Stand Cover

[4] Rear Cabinet

[6] Chassis Bracket

[8] Jack Holder(A)

[10] Main CBA

[13] PCB Holder

[14] Panel Holder

[16] LCD Module Assembly

[20] Front Cabinet

[19] Speaker (L)

[5] Function CBA

[17] LED CBA

[12] Inverter CBA

[15] 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

Chassis

[6]

Bracket

Jack

[7]

Holder(D)

Jack

[8]

Holder(A)

[9] Shield Box D2 4(S-11) ---

Remove/*Unhook/

Fig.

No.

Unlock/Release/

Unplug/Unclamp/

Note

Desolder

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

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

D1 12(S-4), 4(S-5) ---

D1D53(S-6), *CN10, *CN11,

*CN11B

D2 10(S-7), 2(S-8) ---

D2 (S-9) ---

D2 5(S-10) ---

---

Removal

Step/

Loc.

No.

Part

Remove/*Unhook/

Fig.

No.

Unlock/Release/

Unplug/Unclamp/

Note

Desolder

6(S-12), *CN54,

[10] Main CBA

*CN103A, *CN104A,

---

*CN101A, *CN102A,

*CN703

Digital Main

[11]

CBA UnitD3D5

4(S-13), *CN111, *CN400

---

6(S-14), *CN1050,

[12]

Inverter CBA

*CN1100, *CN1150,

*CN1150, *CN1200,

---

*CN1250, CN1300

[13] PCB Holder D3 2(S-15), 2(S-16) ---

Panel

[14]

[15]

Holder

T-CON CBA

D4 6(S-17), 9(S-18) ---

5(S-19), *CN211,

*CN212, *CN213,

*CN214

---

LCD

[16]

Module

D4 --------------- ---

Assembly

[17] LED CBA D4 (S-20) ---

Speaker

[18]

(R)

D4 4(S-21) ---

[19] Speaker (L) D4 4(S-22) ---

Front

[20]

↓

(1)

Cabinet

↓

(2)

D4 --------------- ---

↓

(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. N = Nut, 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

Ta b le . "

4-1 L5920DC

S-6

[5] Function CBA

S-4

[4] Rear Cabinet

[3] Stand Cover

[2] Stand Hinge

[1] Stand Base Plate

S-4

S-5

S-4

S-5

S-1

S-4

S-3

S-2

S-3

S-2

Fig. D1

4-2 L5920DC

[9] Shield Box

[8] Jack Holder(A)

S-10

S-11

S-9

S-11

[7] Jack Holder(D)

S-7

[6] Chassis Bracket

[12] Inverter CBA

S-7

S-8

S-7

Fig. D2

[13] PCB Holder

S-16

S-15

S-16

S-15

S-13

S-12

[11] Digital Main CBA Unit

S-13

S-14

[10] Main CBA

S-12

Fig. D3

4-3 L5920DC

[20] Front Cabinet

[18] Speaker (R)

[14] Panel Holder

S-18

S-20

[17] LED CBA

S-22

[19] Speaker (L)

[16] LCD Module Assembly

[14] Panel Holder

S-17

S-18

S-17

S-21

S-18

S-17

S-18

[15] T-CON CBA

S-17

S-19

S-17

S-18

S-17

Fig. D4

4-4 L5920DC

TV Cable Wiring Diagram

To LCD Module Assembly

CN214

CN211

CN213

CN111

T-CON CBA

CN11A

CN111

CN400

CN212

Digital Main CBA Unit

CN101B

CN102B

CN103B

Inverter CBA

Main CBA

CN101A

CN102A

CN103A

CN54

CN1050

CN1100

CN1000

CN1150

CN1200

CN1250

CN1300

CN703

LED CBA

CN54B

CN104B

Function CBA

CN104A

To Speaker

CN10

CN11

CN11B

Fig. D5

4-5 L5920DC

HOW TO INITIALIZE THE LCD TELEVISION

To put the program back at the factory-default, initialize the LCD television as the following procedure.

How to initialize the LCD television:

1. Turn the power off.

2. To enter the service mode, while pressing [SETUP] button, press [STANDBY-ON] button on the TV unit.

- To cancel the service mode, press [STANDBY-

ON] button on the remote control.

3. To initialize the LCD television, press “DISPLAY” button on the remote control unit.

4. Confirm "FF" indication on the upper left of the screen.

5-1 L5820INT

ELECTRICAL ADJUSTMENT INSTRUCTIONS

General Note: “CBA” is abbreviation for “Circuit Board Assem-

bly.” 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. Pattern Generator

3. Color Analyzer

How to Set up the Service mode:

1. Turn the power off.

2. While pressing [SETUP] button, press [STANDBYON] button on the TV unit

- To cancel the service mode, press [STANDBY-ON] button on the TV unit.

1. Initial Setting

General

Enter the Service mode.

Set the each initial data as shown on table 1 below.

Table 1: Initial Data

BUTTON

ITEM

D1-BRT D1-CNT 128 D1-CLR-R 128 D1-CLR-B 128 D1-TNT 128 D1-SHR 70 D2-BRT D2-CNT 128 D2-CLR-R 128 D2-CLR-B 128 D2-TNT 128 D2-SHR 70 D3-BRT D3-CNT 128 D3-CLR-R 128 D3-CLR-B 128 D3-TNT 128 D3-SHR 40 D4-BRT D4-CNT 128 D4-CLR-R 128 D4-CLR-B 128 D4-TNT 128 D4-SHR 40 BRT CNT 170 CLR-R 128 CLR-B 128 TNT 128 SHR 45 S-BRT S-CNT 170 S-CLR-R 128 S-CLR-B 128 S-TNT 128 S-SHR 45 C-BRT C-CNT 128 C-CLR-R 128 C-CLR-B 128 C-TNT 128 C-SHR 70

(on the remote

control)

MENU → 1

MENU → 2

MENU → 3

MENU → 4

MENU → 5

MENU → 6

MENU → 7

DATA

VALUE

128

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DT-BRT

ITEM

BUTTON

(on the remote

control)

DATA

VALUE

128 DT-CNT 170 DT-CLR-R 128 DT-CLR-B 128

MENU → 8

DT-TNT 128 DT-SHR 45 BRIGHT 0 255 NORMAL 0 176 DARK 0 112 7F LAST POWER ON NCM ON

VOL. p

XV100 OFF *COR 1(C/D/S 1) VOL. p → 1 120 COG 1(C/D/S 1) VOL. p → 2 127 *COB 1(C/D/S 1) VOL. p → 3 131 *DR 1(C/D/S 1) VOL. p → 4 134 DG 1(C/D/S 1) VOL. p → 5 119 *DB 1(C/D/S 1) VOL. p → 6 114 SBR 1(C/D/S 1) VOL. p → 763 SBB 1(C/D/S 1) VOL. p → 963 *COR 2(C/D/S 2) VOL. p → 1 111 COG 2(C/D/S 2) VOL. p → 2 110 *COB 2(C/D/S 2) VOL. p → 3 110 *DR 2(C/D/S 2) VOL. p → 4 125 DG 2(C/D/S 2) VOL. p → 5 115 *DB 2(C/D/S 2) VOL. p → 6 115 SBR 2(C/D/S 2) VOL. p → 763 SBB 2(C/D/S 2) VOL. p → 963 *COR 3(C/D/S 3) VOL. p → 1 120 COG 3(C/D/S 3) VOL. p → 2 127 *COB 3(C/D/S 3) VOL. p → 3 131 *DR 3(C/D/S 3) VOL. p → 4 134 DG 3(C/D/S 3) VOL. p → 5 119 *DB 3(C/D/S 3) VOL. p → 6 114 SBR 3(C/D/S 3) VOL. p → 763 SBB 3(C/D/S 3) VOL. p → 963

2. Purity Check Mode

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

Red mode

[7] button

Green mode

[7] button

Blue mode

[7] button

White mode

Note:

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

NOTE: * These data value will be changed by the White

Balance Adjustment.

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3. Flicker Adjustment

4. Auto Calibration

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

1. Enter the Service mode.

2. Press [2] button on the remote control unit. The following screen appears.

3. If Flicker Adjustment is not fit, the screen become the following.

Purpose: To bring the color adjustment of each component into standard alignment.

Symptom of Misadjustment: If this adjustment is incorrect, component signals do not reproduce the corresponding color.

Gain Adjustment

1. Input white raster signal (5%=5 IRE, 100%=100 IRE) from Component jack.

INPUT SIGNAL

5%=5IRE

2. Enter the service mode.

3. To enter the Auto Calibration adjustment mode, press [5] button on the service remote control unit.

4. To start auto adjustment, press [CH o] button on the service remote control unit.

- In the auto adjustment mode, “Please Wait”

appears on the screen.

- Upon completion, “OK” and appears on the

screen.

- If the auto adjustment failure, “ NG” appears on

the screen.

100%=100IRE

FLASH (Go and Off)

4. Turn the VR1 on the LCD Module so that flash stops.

Offset Adjustment

5. Input white raster signal (5%=5 IRE) from Component jack.

INPUT SIGNAL

5%=5IRE

6. Enter the service mode.

7. To enter the Auto Calibration adjustment mode, press [6] button on the service remote control unit.

8. To start auto adjustment, press [CH o] button on the service remote control unit.

- In the auto adjustment mode, “Please Wait”

appears on the screen.

- Upon completion, “OK” and appears on the

screen.

- If the auto adjustment failure, “ NG” appears on

the screen.

6-3 L5920EA

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

5. White Balance Adjustment

*This adjustment is needed 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 Point Adj. Point Mode Input

[CVBS]

C/D/S 1

Screen

Pattern Generator,

Color analyzer

INPUT: WHITE 70%,25%

1. Operate the unit for more than 20 minutes.

2. Input the White Purity.

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. [CVBS] Enter the Service mode. Press “VOL p” button on the remote control unit and select “C/D/S 1” mode.

VOL. p buttons

M. EQ. Spec.

L = 50 cm

[YUV]

C/D/S 2

[RGB]

C/D/S 3

(APL 70%)

x: 0.242 to 0.302,

y: 0.248 to 0.308

(APL 25%)

x: 0.262 to 0.282,

y: 0.268 to 0.288

Figure

It carries out in a darkroom.

Perpendicularity

Color Analyzer

INPUT SIGNAL

25%=25IRE70%=70IRE

White Purity

(APL 70%)

(APL 25%)

[YUV]

Enter the Service mode. Press “VOL p” button on the remote control unit and select “C/D/S 2” mode.

[RGB]

Enter the Service mode. Press “VOL p” button on the remote control unit and select “C/D/S 3” mode.

5. [CVBS]----(APL 70%) Press “6” button to select “DB 1(C/D/S 1)” for Blue adjustment. Press “4” button to select “DR 1(C/D/S

1)” for Red adjustment. When “x” value and “y” value are not within specification, adjust “DB 1(C/ D/S 1)” or “DR 1(C/D/S 1)”. Refer to “1. Initial Setting.”

[CVBS]----(APL 25%)

Press “3” button to select “COB 1(C/D/S 1)” for Blue adjustment. Press “1” button to select “COR 1(C/D/S 1)” for Red adjustment. When “x” value and “y” value are not within specification, adjust “COB 1(C/D/S 1)” or “COR 1(C/D/S 1)”. Refer to “1. Initial Setting.” After adjusting (APL 25%), verify (APL 70%) again and adjust repeatedly until both values are within specification.

6. [YUV]----(APL 70%) Press “6” button to select “DB 2(C/D/S 2)” for Blue adjustment. Press “4” button to select “DR 2(C/D/S

2)” for Red adjustment.When “x” value and “y” value are not within specification, adjust “DB 2(C/ D/S 2)” or “DR 2(C/D/S 2)”. Refer to “1. Initial Setting.”

[YUV]----(APL 25%)

Press “3” button to select “COB 2(C/D/S 2)” for Blue adjustment. Press “1” button to select “COR 2(C/D/S 2)” for Red adjustment.When “x” value and “y” value are not within specification, adjust “ C O B 2 (C / D / S 2 )” o r “ C O R 2 ( C / D/ S 2 ) ” . Refer to “1. Initial Setting.” After adjusting (APL 25%), verify (APL 70%) again and adjust repeatedly until both values are within specification.

7. [RGB]----(APL 70%) Press “6” button to select “DB 3(C/D/S 3)” for Blue adjustment. Press “4” button to select “DR 3(C/D/S

3)” for Red adjustment.When “x” value and “y” value are not within specification, adjust “DB 3(C/ D/S 3)” or “DR 3(C/D/S 3)”. Refer to “1. Initial Setting.”

[RGB]----(APL 25%)

Press “3” button to select “COB 3(C/D/S 3)” for Blue adjustment. Press “1” button to select “COR 3(C/D/S 3)” for Red adjustment.When “x” value and “y” value are not within specification, adjust “ C O B 3 (C / D / S 3 )” o r “ C O R 3 ( C / D/ S 3 ) ” . Refer to “1. Initial Setting.” After adjusting (APL 25%), verify (APL 70%) again and adjust repeatedly until both values are within specification.

8. Turn the power off and on again. (Main power button on the TV unit.)

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