Funai LT850-M22 Schematic

SERVICE MANUAL

This Service Manual is for the LT850-M22 (A0C70EP) / LT851-M22 (A0C71EP) model. For the LT850-M22 (A0C70EP) / LT851-M22 (A0C71EP) model, the letter (A0C70EP) / (A0C71EP) is printed on the Serial Number Label on the back of the unit. Refer to the Serial Number Label below.

Serial No. Label Serial No. Label

"A0C70EP" "A0C71EP"

22″ COLOR LCD TELEVISION

LT850-M22 / LT851-M22

22″ COLOR LCD TELEVISION

LT850-M22 / LT851-M22

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 Television. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1

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

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

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.

1-1 A0C70_1SP

SPECIFICATIONS

< TUNER >

VHS/UHF Input ----------- 75Ω unbal., IEC Connector Center IF ------------------- SECAM-L 38.9MHz, SECAM-L’ 33.9MHz

< LCD PANEL >

<DVB-T>

*1: modulation parameters = [8k 64QAM CR=2/3 GI=1/32] *2: modulation parameters = [8k 16QAM CR=3/4 GI=1/8] *3: modulation parameters = [2k 64QAM CR=2/3 GI=1/32] *4: modulation parameters = [2k 16QAM CR=3/4 GI=1/32]

< VIDEO >

Description Condition Unit Nominal Limit

1. Video S/N 80 dB --- 40

2. Audio S/N --- dB --- 40/40

Description Condition Unit Nominal Limit

1. Number of Pixels

Horizontal

Ver ti ca l

pixels pixels

1366

768

---

2. Viewing Angle

Horizontal

Ver ti ca l

° °

-85 to 85

-80 to 80

-75 to 75

-70 to 70

Description Condition Unit Nominal Limit

RECEIVED FREQ.RANGE (-60dBm, 45ch.) *1, *2

kHz kHz

1000

900

500 167

2. INPUT DYNAMIC RANGE (mix./max)

c:*1 VHF HIGH 8ch.

UHF 45ch.

dBuV dBuV

25/101 25/101

28/98 29/98

d:*2 VHF HIGH 8ch.

UHF 45ch.

dBuV dBuV

18/101 18/101

21/98 21/98

3. C/N PERFORMANCE

(-50dBm)

c:*1 VHF HIGH 8ch.

UHF 45ch.

dB dB

15 15

≦18 ≦18

d:*2 VHF HIGH 8ch.

UHF 45ch.

dB dB

11 11

≦14 ≦14

4. MULTIPATH (-50dBm)

a. Performance with

short delay echoes

b. Performance with

long delay echoes

UHF 45ch.

c:*3 d:*4 c:*3 d:*4

dB dB dB dB

18.7

14.0

19.1

13.0

≦23 ≦20 ≦23 ≦18

Description Condition Unit Nominal Limit

1. Over Scan

Horizontal

Vert i cal

% %

5 5

---

2. Color Temperature

AT 70% WHITE FIELD

x y

°K 9200

0.286

0.295

--±0.008 ±0.008

3. Resolution

Horizontal

Vert i cal

line line

400 350

---

4. Brightness

AT 100% WHITE FIELD

Retail Home

cd/m

230 160

---

1-2 A0C70_1SP

< AUDIO >

All items are measured across 16 Ω load at speaker output terminal.

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.

Description Condition Unit Nominal Limit

1. Audio Output Power 10% THD: Lch/Rch W 3.0/3.0 2.0/2.0

2. Audio Distortion 500mW: Lch/Rch % 1.5/1.5 3.0/3.0

3. Audio Freq. Response

6dB: Lch

6dB: Rch

Hz Hz

70 to 10 k 70 to 10 k

---

4. Audio S/N Lch/Rch dB ---

≧45/45

2-1 LTVP_ISP

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.

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.

ALSO TEST WITH PLUG REVERSED USING AC ADAPTER PLUG AS REQUIRED

TEST ALL EXPOSED METAL SURFACES

READING SHOULD NOT BE ABOVE 0.5 mA

EARTH GROUND

DEVICE

LEAKAGE

CURRENT

TESTER

BEING

TESTED

2-2 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

1.0 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.

2-3 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. 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.

2-4 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

Note: This table is unofficial and for reference only.

Be sure to confirm the precise values.

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.).

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

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

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

220 to 240 V

≥ 3mm(d)

≥ 8mm(d’)

Fig. 1

Chassis or Secondary Conductor

Primary Circuit

d' d

Fig. 2

AC Voltmeter (High Impedance)

Exposed Accessible Part

One side of Power Cord Plug Prongs

AC Line Voltage Load Z Leakage Current (i)

One side of power cord plug

prongs (B) to:

220 to 240 V

2kΩ RES.

Connected in

parallel

i≤0.7mA AC Peak

i≤2mA DC

RF or

Antenna terminals

50kΩ RES.

Connected in

parallel

i≤0.7mA AC Peak

i≤2mA DC

A/V Input, Output

3-1 TVP_SN

STANDARD NOTES FOR SERVICING

Circuit Board Indications

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

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

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

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.

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)

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.

To p Vi ew

Out

Bottom View

Input

Pin 1

Pb free mark

Fig. S-1-1

Hot-air Flat Pack-IC Desoldering Machine

CBA

Flat Pack-IC

Tweezers

Masking Ta pe

Fig. S-1-2

3-2 TVP_SN

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)

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)

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

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.

Flat Pack-IC

Desoldering Braid

Soldering Iron

Fig. S-1-3

Fine Tip Soldering Iron

Sharp Pin

Fig. S-1-4

To Solid Mounting Point

Soldering Iron

Iron Wire

Hot Air Blower

Fig. S-1-5

Fine Tip Soldering Iron

CBA

Flat Pack-IC

Tweezers

Fig. S-1-6

3-3 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 “ I ” 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.

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.

Example :

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

Fig. S-1-7

Presolder

CBA

Flat Pack-IC

Fig. S-1-8

CBA

Grounding Band

Conductive Sheet or Copper Plate

1MΩ

CBA

4-1 A0C72_73DC

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.

2. Disassembly Method

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, 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 b l e. "

Step/

Loc.

No.

Part

Removal

Fig.

No.

Remove/*Unhook/

Unlock/Release/

Unplug/Unclamp/

Desolder

Note

[1]

Stand Assembly

D1 3(S-1) ---

[2]

Rear Cabinet

12(S-2), 3(S-3), (S-4), (S-5)

---

[3]

Tuner Shield

D2 (S-6) ---

[4] Main CBA

D2 D3

10(S-7), *CN102A, *CN103, *CN301, *CN401, *CN402, *CN403, *CN404, *CN801, *CN802, *CN1550, *CN1650, *CN1750

---

[5]

HP Jack Holder

D2 (S-8) ---

[6] Jack CBA

D2 D3

3(S-9) ---

[7] Jack Holder D2 (S-10) ---

[1] Stand

Assembly

[2] Rear Cabinet

[11] Speaker

[8] Shield Box

[3] Tuner Shield

[7] Jack Holder

[9] Digital Main CBA Unit

[4] Main CBA

[10] LCD Module Assembly

[14] Front Cabinet

[12] Junction CBA

[13] Function CBA

[6] Jack CBA

[5] HP Jack Holder

[8] Shield Box

D2 D3

2(S-11), (S-12), 5(S-13), 2(H-1), *CN3901

---

[9]

Digital Main CBA UnitD2D3

--------------- ---

[10]

LCD Module Assembly

(S-14), 2(S-15), Stand Holder, Separation Sheet

---

[11] Speaker D2

4(S-16), Speaker Holder

---

[12]

Junction CBA

D2 D3

Desolder ---

[13]

Function CBA

D2 D3

2(S-17) ---

[14]

Front Cabinet

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

↓

(1)

↓

(2)

↓

(3)

↓

(4)

↓

(5)

Step/

Loc.

No.

Part

Removal

Fig.

No.

Remove/*Unhook/

Unlock/Release/

Unplug/Unclamp/

Desolder

Note

4-2 A0C72_73DC

[2] Rear Cabinet

[1] Stand Assembly

(S-3)

(S-2)

(S-4)

(S-5)

(S-1)

Fig. D1

4-3 A0C72_73DC

(S-8)

(S-10)

[3] Tuner Shield

[5] HP Jack Holder

[7] Jack Holder

[6] Jack CBA

[4] Main CBA

[9] Digital Main CBA Unit

[10] LCD Module Assembly

[11] Speaker

[12] Junction CBA

[13] Function CBA

[14] Front Cabinet

(S-11)

(S-13)

(S-7)

(S-15)

(S-14)

(S-6)

(S-9)

(S-16)

(S-12)

(H-1)

Speaker Holder

Separation Sheet

Stand Holder

Speaker Holder

(S-17)

[8] Shield Box

Fig. D2

4-4 A0C72_73DC

TV Cable Wiring Diagram

Main CBA

Digital Main CBA Unit

Jack CBA

CN3704

CN3702

CN3703

CN3701

CN3901

Junction CBA

Function CBA

To Speaker

To LCD Module Assembly

CN101B

CN102B CN101A

CN452

CN401

CN404

CN403

CN402

CN1550

CN1650

CN1750

CN801

AC CORD

CN301

CN802

CN102A

CN103

Fig. D3

5-1 A0CN0EA

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 set up the service mode:

Service mode:

1. Turn the power on.

2. Press [MENU] button to display Setup menu.

3. Select “Software” in “OTHERS” and press [OK] button.

4. Press [0], [4], [2], [5], [7], [4] and [ ] buttons on the remote control unit in this order. The following screen appears.

Code : Pic code :

Inch : MIPS :

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

Safety : Safety_Non

"*" differs depending on the models.

5-2 A0CN0EA

1. 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 remote control unit, the display changes as follows.

3. To cancel or to exit from the Purity Check Mode, press [BACK] button.

2. VCOM Adjustment

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. To enter the “VCOM-2 adjustment mode”, press [3] button on the remote control unit. To enter the “VCOM-1 adjustment mode”, press [2] button on the remote control unit.

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

6. To cancel or to exit from the VCOM Adjustment, press [BACK] button.

[7] button

Note:

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

Purity Check Mode

[7] button

Red mode

Green mode

Blue mode

Black mode

[7] button

White mode

[7] button

White 20% mode

[7] button

Test Point Adj. Point

Screen

[P / ]

buttons

M. EQ. Spec.

Color analyzer See below

Figure

Color Analyzer

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

L = 3 cm

Perpendicularity

5-3 A0CN0EA

The White Balance Adjustment should be performed when replacing the LCD Panel or Digital Main 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.

1. Operate the unit for more than 20 minutes.

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

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

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 [P / ] buttons to adjust the values of color.

7. Adjust Cutoff and Drive so that the color temperature becomes 9200°K (x

0.286 / y= 0.295

±0.005).

8. To cancel or to exit from the White Balance Adjustment, press [BACK] button.

Tes t Po int

Adj. Point Mode Input

Screen

[P / ]

buttons

[VIDEO1]

C/D

White Raster

(APL 70%)

(APL 40%)

M. EQ. Spec.

Pattern Generator,

Color analyzer

x= 0.286 ± 0.005 y= 0.295 ± 0.005

Figure

Color Analyzer

L = 3 cm

Perpendicularity

INPUT: WHITE 70%, 40%

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

40%=40IRE

70%=70IRE

100IRE

0IRE 0IRE

INPUT SIGNAL

Low

Light

Hight Light

6-1 A0CN0INT

HOW TO INITIALIZE THE LCD TELEVISION

How to initialize the LCD television:

1. Turn the power on.

2. Enter the service mode. (Refer to page 5-1.)

- To cancel the service mode, press [ ] button on the remote control unit.

3. Press [ ] 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 initializing is complete.

7-1 LC8.5FW

FIRMWARE RENEWAL MODE

Equipment Required

a. USB storage device b. Remote Control Unit

Firmware Update Procedure

[Check the current version]

1. Press [MENU] button on the remote control unit to display the menu mode.

2. Press [ÅK] or [ÅL] to select “OTHERS”, then press [OK] button.

3. Press [ÅK] or [ÅL] to select “Software”, then press [OK] button.

The current FW version will be displayed.

[Preparation]

1. Prepare USB storage device.

2. Copy F/W-file (ecc file) to USB storage device. Note: Make sure to use the blank USB Storage.

3. Rename the F/W-file’s name.

Step1. Add the “_F” at the end of the name.

(If the file name in USB says “ZF6731915NOS-030-05.ecc”, the new file name should be “ZF6731915NOS-030-05_F.ecc”.)

Step2. The 6th and 7th digit of the file name

indicate the size of TV. If the size of your TV and the file name were not the same, you must change the file name.

[Update procedure]

1. Plug in the AC power cord.

2. Press [ ] button on the remote control unit to turn off (standby).

3. Check “STAND BY” indicator (Red LED) lighting.

4. Insert USB storage device with F/W to TV set.

5. Press [ ] button to turn on.

6. After approximately 70 seconds, the following will appear on the screen and the update begins automatically.

Note: Do not turn off the TV set and do not remove the USB storage device while this procedure.

The update will be completed in about 2 minutes. And the following screen appears.

7. Press [ ] button to turn off (standby).

8. Check “STAND BY” indicator (Red LED) lighting.

9. Remove USB storage device from TV set.

10. Press [ ] button to turn on.

(Example)

The software upgrade is completed.

Remove USB storage device, turn TV off and then on again.

(Example)

8-1 A0CN0TR

TROUBLESHOOTING

Check IC605, D603, D606 and their pe

riphery, and

service it if defective.

The power cannot be turned on.

The fuse blows out.

FLOW CHART NO.1

FLOW CHART NO.2

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

Check if there is any leak or short-circuiting on the primary circuit component, and service it if defective. (IC605, Q601, Q602, D602, D604, D605, D607, T601, R602)

Ye s

Is the fuse (F601) normal?

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

Ye s

Is approximately 32V voltage supplied to the cathode of D618?

Check each rectifying circuit of the secondar

y circuit

and service it if defective.

Check the presence that the

primary component is

leaking or shorted and service it if defective.

Check the presence that the

rectifying diode or circuit

is shorted in each r

ectifying circuit of secondary side,

and service it if de

fective.

After servicing, replace the fus

e (F601).

When the output voltage fluctuates.

FLOW CHART NO.3

Does the photocoupler circuit on

the secondary side

operate normally?

Ye s

Check IC605, Q603, D615, D623, D628 and their periphery, and service it if defective.

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

FLOW CHART NO.4

Check if there is any short-circuit on the rectifying diode and the circ

uit in each rectifying circuit of the secondary side, and

service it if defective. (D612, D616, D618, D6

22, D637, Q605, Q606, Q609, Q611, Q615, Q616)

8-2 A0CN0TR

P-ON+5V is not output.

FLOW CHART NO.6

Ye s

Is approximately 6V voltage supplied to the base of Q616?

AL+3.3V is not output.

FLOW CHART NO.5

Ye s

Is approximately 5V voltage supplied to the collector of Q605?

Check D637, C628 and their periphery circuit, and service it if defective.

Check Q607, Q610, D653, P-ON-H2 line and their periphery circuit, and service it if defective.

Ye s

Is approximately 4V voltage supplied to the base of Q605?

Check D634 and their periphery circuit, and service it if defective.

Replace Q605.

Is approximately 7.5V voltage supp

lied to the collector

of Q616?

AL+7.5V is not outputted.

FLOW CHART NO.7

Ye s

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

Check D637, C628 and their periphery circuit, and service it if defective.

Is approximately 7.5V voltage supplied to the cathode of D637?

AL+15V(1) is not outputted.

FLOW CHART NO.8

Ye s

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

Check D612, D620, C613 and their periphery circuit, and service it if defective.

Is approximately 15V voltage supplied to the cathode of D612?

8-3 A0CN0TR

PANEL+12.5V is not output.

FLOW CHART NO.10

Is approximately

15V voltage supplied to the cathode

of D612?

Ye s

Check D612, D620, C613 and their per

iphery circuit,

and service it if defec

tive.

Check D613, C618 and their periphery circuit, and service it if defective.

Check D640, R657, R658 and their periphery circuit, and service it if defective.

Ye s

Replace Q611.

Replace Q615.

LCD-5.5V is not output.

FLOW CHART NO.11

Is approximately -10V voltage supplied to the anode of D613?

Is approximately -10V voltage supplied to the base of Q611?

Ye s

Is approximately 1

3V voltage supplied to the base

of Q615?

Check D664 an

d their periphery circuit, and

service it if defective.

PANEL+25.6V is not output.

FLOW CHART NO.9

Ye s

Is approximately 32V voltage supplied to the cathode of D618?

Is approximately 32V voltage outputted to the collector of Q612?

Ye s

Check D617, D636 and their periphery circuit, and service it if defective.

Check D618, D623, C616 and their periphery circuit, and service it if defective.

Check Q612, Q613, P-ON-H1 line and their periphery circuit, and service it if defective.

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