Toshiba 40L2546, 50L2546, 40L2556, 50L2556 Schematic

40_50L2546/56 Service manual

Caution

Be sure to read this manual before servicing. To ensure safety from fire, electric shock, injury, harmful radiation and materials, various measures are provided in this LCD Television. Be sure to read cautionary items described in the manual before servicing. These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock, do not perform any servicing other than that described in the operating instructions unless you are qualified to do so.

Service Warning

1. Since the Panel Module and the front Filter are made of glass, handling the broken Module and Filter carefully and with caution in order not to receive injury.

2. Replacement work should be started after the Panel Module and the AC/DC Power supply have become sufficiently cool.

3. Special care should be taken when working near the display area in order not to damage its surface.

4. The Panel Module should not be touched with bare hands in order to protect its surface from blemishes and damage.

5. It is recommended that you use clean soft gloves during the replacement work in order to protect not only the display area of the Panel Module but also yourself.

1. Features……………………………3

2. ………………………4 2. Specifications

3. …………..…….9 Component names

4. Side Inputs………………….……..10

5. Remote Control……………….…..11

Contents

Service points………………………..13

Adjustment…………………….……..14

8. TTroubleshooting……………………..20

CAUTION FOR SAFETY

Please read this page before repair the monitor. The following safety precautions are designed to help you stay safe and prevent accidents during the repair work.

z Please take note of these cautionary flags.

Warning

Caution

z Also note these cautionary icons

This means "CAUTION"

This means "POTENTIAL ELECTRIC SHOCK"

This means "Potential to sustain injury or even death."

This means "Potential to sustain breakage or irreparable damage."

This means "MUST"

This means "DO NOT"

WARNING

 Follow instructions.  Must use same types of wires and

components.

The cabinet, chassis, and labels are parts that require attention. You must follow the caution notes and safety instructions presented throughout this User Manual to prevent damage to them or injury to yourself.

 Prevent electric shock.

Exercise caution while working on the device as the Monitor contains high voltage parts and power supply.It is possible to sustain severe injury or death if you accidentally touch the wrong parts.You must disconnect the power supply while servicing, reassembling, or change parts. If you touch a live connection it is possible to sustain severe injury or death.

 Use recommended components.

Use only the recommended components or componentst that structurally identical to the originals. This is to ensure safety and reliability. Pay special attention to parts in the parts list and circuit diagrams

marked with non-recommended components, then electric shock or fire may result.

. If you use

 Perform safety check when done.

 Do not try to check the HDCP code and

combination circuit.

The Monitor uses special tubes and tapes made from insulated materials. Moreover, some materials are kept from making contact with the PWB for the sake of safety.Internal leads are kept from hot parts or high voltage parts by means of clamps or other measures. As such, you must restored these parts to their original conditions in order to prevent electric shock or fire.

Every part (such as removed screws, components, and wiring) must be restored to their prior conditions after servicing.Be sure to check everything that was repaired for damage or mistakes. Also measure the insulated impedance with a meg-ohm meter to confirm that the impedance value is more than 4M ohm.If the impedance value is less than 4M ohm, then electric shock or fire may result.

Never remove the shield case protecting the HDCP code and combination circuit.

PRECAUTIONS

z Cleaning the LCD panel of the television

Please make sure to unplug the power cord before cleaning the television.

● Wipe the panel with a lint-free and dry cloth in order to prevent damage to the panel surface.

● Do not use a chemical cloth or cleaner. Depending on the ingredients, it may cause discoloration and

damage the panel surface.

● Do not wipe with a hard cloth or rub hard. It may hurt the panel surface.

● In case of the greasy dirt such as fingerprint, wipe with a lint-free cloth moistened by a diluted neutral

detergent solution, and then wipe with a soft and dry cloth.

● Do not use a spray cleaner. It could cause malfunction.

z Cleaning the monitor's cabinet of the television

● The following may cause crack, deformation, and paint peeling.

● Do not wipe the cabinet with benzene, thinner, and other chemical products.

● Do not spray volatile solutions such as insecticide over the cabinet.

● Do not leave the cabinet in prolonged contact with plastic or rubber materials.

● Do not use a chemical cloth, cleaner or wax. Depending on the ingredients, it may cause crack and

deformation.

● Use a lint-free cloth to clean the cabinet and control panel of the television. In case of the heavy dirt,

wipe with a soft cloth moistened by a diluted neutral detergent solution, and then wipe with a soft and dry cloth.

● Never use the following detergents. It could cause crack, discoloration, and scratch.

● Acid/ alkaline detergent, alcoholic detergent, abrasive cleaner, powder soap, OA cleaner, car wax, glass

cleaner, etc.

Features

● Large-screen and high-definition LCD panel.

● Improved Digital signal processor.

● Accept more digital input devices with HDMI terminals.

● Great diversity of connecting terminals to cover wide range of audio-visual equipments.

● Enjoy the image from PC with large, high-definition LCD screen.

● Easy-to-use On-Screen Display system operating with Remote control.

● Low power consumption.

●

2. Specifications

SPECIFICATION 40L2546/56 50L2546/56

Display dimensions

Panel

Resolution 1920(H) x 1080 (V) pixels 1920(H) x 1080 (V) pixels

Net dimensions

Net weight

Ambient conditio ns

Power consumption in standby mode

(VIDEO input)

Input terminals

Temperature

Relative Humidity

878.112 (H) x 485.352 (V) mm 1095.84 (H) x 616.41 (V) mm

including Stand: 904 (W) x 567 (H) x

194(D) mm

including Stand: 11.0 kg

Operating: 5°C to 35°C, Storage: 20°C to 80°C

Operating: 20% to 80%, Storage: 5% to 90%

0.4W 0.4W

SCART :Full RGB output Component : Y incluse composite video input terminal

(RCA : L/R audio input terminal (RCA)

HDMI 1,2 : HDMI input terminal



including Stand: 1122 (W) x 701(H) x

216(D) mm

including Stand: 16.5 kg

Operating: 5 C to 35°C, Storage: 20°C to 80°C

Operating: 20% to 80%, Storage: 5% to 90%

AC 110~240V±10%, 50~60Hz±3Hz Power supply AC 110~240V±10%, 50~60Hz±3Hz

7W+7W Audio output 7W+7W

Output signals

(RF input)

RF Video System

(RGB input)

Input terminals

Headphone output: Socket (3.5mm) Optical output : SPDIF

ATV:NTSC/PAL/SECAM standard

DTV:DVB-T/C/T2

DVB-S/S2 : Satellite

Analog RGB input terminal (D-sub 15-pin) Audio input terminal (Component L/R audio input terminal (RCA)

0.7 V, analog RGB (Recommended Signal) Input signals

`H/V separate, TTL level [2kΩ] Sync signals

Video support timing

PAL 50/60Hz

Composite Video

Component Video

PC Input (D-Sub)

HDMIVideo Format

SECAM NTSC 480i / 480p / 720p / 1080i (60Hz) 576i / 576p / 720p / 1080i (50Hz) VGA (640 x 480) (60Hz) S-VGA (800 x 600) (60Hz) XGA (1024 x 768) (60Hz) W-XGA (1280 x 768) (60Hz) W-XGA (1280 x 800) (60Hz) W-XGA1360 x 768) (60Hz) W-XGA+ (1440 x 900) (60Hz) S-XGA (1280 x 1024) (60Hz) 480i (60Hz) / 576i (50Hz) 480p (60Hz) / 576p (50Hz) 720p (24/30/50/60Hz) 1080i (60Hz) / 1080i (50Hz)

HDMI-

PC Format

1080p (24/30/50/60Hz) VGA (640 x 480) (60Hz) SVGA (800 x 600) (60Hz) XGA (1024 x 768) (60Hz) WXGA (1280 x 768) (60Hz) WXGA (1360 x 768) (60Hz) SXGA (1280 x 1024) (60Hz)

PC/HDMI timing table

Mode

VGA 60Hz

640x480

SVGA 60Hz

800x600

XGA 60Hz

1024x768

WXGA 60Hz

1280x768

WXGA 60Hz

1280x768

WXGA 60Hz

FREQ PERIOD

LINE(kHz)

FRAME(Hz)

LINE (pixel)

FIELD(lines)

SYNC

POLARITY

LINE

FIELD

PIXEL

CLOCK

(MHz)

Display

LINE (pixel)

FRAME(lines)

SYNC

WIDTH

LINE (pixel)

FRAME

(lines)

BACK

PORCH

LINE (pixel)

FRAME

(lines)

31.469 800 Negative 25.175 640 96 40

59.941 525 Negative 480 2 25

37.879 1056 Positive 40 800 128 88

60.317 628 Positive 600 4 23

48.363 1344 Negative 65 1024 136 160

60.004 806 Negative 768 6 29

47.396 1440 Positive 68.25 1280 32 80

59.995 790 Negative 768 7 12

47.776 1664 Negative 79.5 1280 128 192

59.87 798 Positive 768 7 20

63.981 1688 Positive 108 1280 112 248

1280x1024

WXGA 60Hz

1360x768

W-XGA+ 60Hz

1440x900

60.02 1066 Positive 1024 3 38

47.712 1792 Positive 85.5 1360 112 256

60.015 795 Positive 768 6 18

55.935 1904 Negative 106.5 1440 152 232

59.887 934 Positive 900 6 25

HDMI Video timing table

FREQ FREQ PERIOD

SYNC

POLARITY

PIXEL

CLOCK

Display

SYNC

WIDTH

BACK

PORCH

MODE

59.94Hz 1440x480i

59.94 262.5 Negative 240 3 15

60Hz 1440x480i

60 262.5 Negative 240 3 15

50Hz 1440x576i

50 312.5 Negative 288 3 19

59.94Hz 720x480P

60Hz 720x480P

60 525 Negative 480 6 30

50Hz 720x576P

59.94Hz 1280x720P

LINE(kHz)

FRAME(Hz)

15.734 1716 Negative 27 1440 124

15.75 1716 Negative 27.027 1440 124

15.625 1728 Negative 27 1440 126

31.469 858 Negative 27 720 62

59.94 525 Negative

31.5 858 Negative 27.027 720 62

31.25 864 Negative 27 720 64

50 625 Negative

44.955 1650 Positive 74.175 1280 40

LINE (pixel)

FIELD(lines)

LINE

(MHz)

FIELD

LINE (pixel)

FRAME

(lines)

480 6

576 5

LINE (pixel)

FRAME

(lines)

LINE (pixel)

FRAME

(lines)

114

138

220

59.939 750 Positive 720 5 20

60Hz 1280x720P

60 750 Positive 720 5 20

50Hz 1280x720P

60 750 Positive 720 5 20

59.94Hz 1920X1080i

60Hz 1920X1080i

60 562.5 Positive 540 5 15

50Hz 1920X1080i

59.94Hz

45 1650 Positive 74.25 1280 40

37.5 1980 Positive 74.25 1280 40

33.716 2200 Positive 74.175 1920 44

59.94 562.5 Positive

540 5

33.75 2200 Positive 74.25 1920 44

28.125 2640 Positive 74.25 1920 44

50 562.5 Positive

540 5

220

148

67.43 2200 Positive 148.352 1920 44 148

1920X1080P

59.94 1125 Positive 1080 5 36

60Hz 1920X1080P

60 1125 Positive 1080 5 36

67.5 2200 Positive 148.5 1920 44

148

50Hz 1920X1080P

50 1125 Positive 1080 5 36

24Hz 1920x1080P

24 1125 Positive 1080 5 36

29.97Hz

56.25 2200 Positive 148.5 1920 44

27 2750 Positive 74.25 1920 44 148

148

33.72 2750 Positive 74.25 1920 44 148

1920x1080P

29.97 1125 Positive 1080 5 36

30Hz 1920x1080P

33.75 2750 Positive 74.25 1920 44 148

30 1125 Positive 1080 5 36

Component timing table

FREQ PERIOD

MODE

59.94Hz 720x480i

50Hz 720x576i

59.94Hz 720x483P

50Hz 720x576P

59.94Hz 1280x720P

LINE(kHz)

FRAME

(Hz)

15.734 858 Negative 13.5 712 64 62

59.94 262.5 Negative 242 3 14

15.625 864 Negative 13.5 702 64 78

50 312.5 Negative 287 2.5 20.5

31.47 858 Negative 27 720 63 59

59.94 525 Negative 483 6 30

31.25 864 Negative 27 720 63 69

50 625 Negative 576 5 39

44.96 1650 Positive 74.176 1280 40 220

59.94 750 Positive 720 5 20

LINE (pixel)

FIELD

(lines)

SYNC

POLARITY

LINE

FIELD

PIXEL

CLOCK

(MHz)

Display

LINE (pixel)

FRAME

(lines)

SYNC

WIDTH

LINE (pixel)

FRAME

(lines)

BACK

PORCH

LINE (pixel)

FRAME

(lines)

60Hz 1280x720P

50Hz 1280x720P

59.94Hz 1920X1080i

60Hz 1920X1080i

50Hz 1920X1080i

45 1650 Positive 74.25 1280 40 220

60 750 Positive 720 5 20

37.5 1920 Positive 74.25 1280 40 220

50 750 Positive 720 5 20

33.72 2200 Positive 74.176 1920 44 148

59.94 562.5 Positive 540 5 15

33.75 2200 Positive 74.25 1920 44 148

60 562.5 Positive 540 5 15

28.13 2640 Positive 74.25 1920 44 148

50 562.5 Positive 540 5 15

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