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	Contents		6.
2.	2. Specifications………………………4		Service points………………………..13
3.	Component names…………..…….9		7. Adjustment…………………….……..14
4.	Side Inputs………………….……..10		8. TTroubleshooting……………………..20
5.	Remote Control……………….…..11

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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.

zPlease take note of these cautionary flags.

Warning	This means "Potential to sustain injury or even death."
Caution	This means "Potential to sustain breakage or irreparable damage."

z Also note these cautionary icons

This means "CAUTION"

This means "POTENTIAL ELECTRIC

SHOCK"

This means "MUST"

This means "DO NOT"

WARNING

Follow instructions.

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 . If you use non-recommended components, then electric shock or fire may result.

Must use same types of wires and

components.

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.

Perform safety check when done.

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.

Do not try to check the HDCP code and

combination circuit.

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

2

PRECAUTIONS

zCleaning 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.

zCleaning 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.

1. 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.

●

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2. Specifications

	SPECIFICATION				40L2546/56			50L2546/56
			Display dimensions		878.112 (H) x 485.352 (V) mm			1095.84 (H) x 616.41 (V) mm
	Panel
			Resolution		1920(H) x 1080 (V) pixels			1920(H) x 1080 (V) pixels
	Net dimensions				including Stand: 904 (W) x 567 (H) x			including Stand: 1122 (W) x 701(H) x
					194(D) mm			216(D) mm
	Net weight				including Stand: 11.0 kg			including Stand: 16.5 kg
	Ambient		Temperature		Operating: 5°C to 35°C, Storage:			Operating: 5 C to 35°C, Storage: 20°C
					20°C to 80°C			to 80°C
	conditio
					Operating: 20% to 80%, Storage: 5%			Operating: 20% to 80%, Storage: 5%
	ns		Relative Humidity
					to 90%			to 90%
	Power supply				AC 110~240V±10%, 50~60Hz±3Hz			AC 110~240V±10%, 50~60Hz±3Hz
	Power consumption in standby				0.4W			0.4W
	mode
	Audio output				7W+7W			7W+7W
	(VIDEO input)
					SCART	:Full RGB output
	Input terminals				Component	: Y incluse composite video input terminal
						(RCA : L/R audio input terminal (RCA)
					HDMI 1,2	: HDMI input terminal
	Output signals				Headphone output: Socket (3.5mm)
					Optical output : SPDIF
	(RF input)
					ATV:NTSC/PAL/SECAM standard
	RF Video System				DTV:DVB-T/C/T2
					DVB-S/S2 : Satellite
	(RGB input)
	Input terminals				Analog RGB input terminal (D-sub 15-pin)
					Audio input terminal (Component L/R audio input terminal (RCA)
	Input signals				0.7 V, analog RGB (Recommended Signal)
	Sync signals				`H/V separate, TTL level [2kΩ]

4

Video support timing

		PAL 50/60Hz
	Composite Video
		SECAM
		NTSC
	Component Video	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)
	PC Input (D-Sub)	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)
	HDMI-	480p (60Hz) / 576p (50Hz)
		720p (24/30/50/60Hz)
	Video Format
		1080i (60Hz) / 1080i (50Hz)
		1080p (24/30/50/60Hz)
		VGA (640 x 480) (60Hz)
		SVGA (800 x 600) (60Hz)
	HDMI-
		XGA (1024 x 768) (60Hz)
	PC Format
		WXGA (1280 x 768) (60Hz)
		WXGA (1360 x 768) (60Hz)
		SXGA (1280 x 1024) (60Hz)

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PC/HDMI timing table

	FREQ	PERIOD	SYNC	PIXEL	Display	SYNC	BACK
			POLARITY	CLOCK		WIDTH	PORCH
Mode
	LINE(kHz)	LINE (pixel)	LINE		LINE (pixel)	LINE (pixel)	LINE (pixel)
				(MHz)		FRAME	FRAME
	FRAME(Hz)	FIELD(lines)	FIELD		FRAME(lines)
						(lines)	(lines)
VGA 60Hz	31.469	800	Negative	25.175	640	96	40
640x480	59.941	525	Negative		480	2	25
SVGA 60Hz	37.879	1056	Positive	40	800	128	88
800x600	60.317	628	Positive		600	4	23
XGA 60Hz	48.363	1344	Negative	65	1024	136	160
1024x768	60.004	806	Negative		768	6	29
WXGA 60Hz	47.396	1440	Positive	68.25	1280	32	80
1280x768	59.995	790	Negative		768	7	12
WXGA 60Hz	47.776	1664	Negative	79.5	1280	128	192
1280x768	59.87	798	Positive		768	7	20
WXGA 60Hz	63.981	1688	Positive	108	1280	112	248
1280x1024	60.02	1066	Positive		1024	3	38
WXGA 60Hz	47.712	1792	Positive	85.5	1360	112	256
1360x768	60.015	795	Positive		768	6	18
W-XGA+ 60Hz	55.935	1904	Negative	106.5	1440	152	232
1440x900	59.887	934	Positive		900	6	25

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HDMI Video timing table

	FREQ	FREQ	PERIOD	SYNC	PIXEL	Display	SYNC	BACK
				POLARITY	CLOCK		WIDTH	PORCH
		LINE(kHz)	LINE (pixel)	LINE		LINE (pixel)	LINE (pixel)	LINE (pixel)
	MODE				(MHz)	FRAME	FRAME	FRAME
		FRAME(Hz)	FIELD(lines)	FIELD
						(lines)	(lines)	(lines)
	59.94Hz 1440x480i	15.734	1716	Negative	27	1440	124	114
		59.94	262.5	Negative		240	3	15
	60Hz 1440x480i	15.75	1716	Negative	27.027	1440	124	114
		60	262.5	Negative		240	3	15
	50Hz 1440x576i	15.625	1728	Negative	27	1440	126	138
		50	312.5	Negative		288	3	19
	59.94Hz 720x480P	31.469	858	Negative	27	720	62	60
		59.94	525	Negative		480	6	30
	60Hz 720x480P	31.5	858	Negative	27.027	720	62	60
		60	525	Negative		480	6	30
	50Hz 720x576P	31.25	864	Negative	27	720	64	68
		50	625	Negative		576	5	39
	59.94Hz 1280x720P	44.955	1650	Positive	74.175	1280	40	220
		59.939	750	Positive		720	5	20
	60Hz 1280x720P	45	1650	Positive	74.25	1280	40	220
		60	750	Positive		720	5	20
	50Hz 1280x720P	37.5	1980	Positive	74.25	1280	40	220
		60	750	Positive		720	5	20
	59.94Hz 1920X1080i	33.716	2200	Positive	74.175	1920	44	148
		59.94	562.5	Positive		540	5	15
	60Hz 1920X1080i	33.75	2200	Positive	74.25	1920	44	148
		60	562.5	Positive		540	5	15
	50Hz 1920X1080i	28.125	2640	Positive	74.25	1920	44	148
		50	562.5	Positive		540	5	15
	59.94Hz	67.43	2200	Positive	148.352	1920	44	148
	1920X1080P
		59.94	1125	Positive		1080	5	36
	60Hz 1920X1080P	67.5	2200	Positive	148.5	1920	44	148
		60	1125	Positive		1080	5	36
	50Hz 1920X1080P	56.25	2200	Positive	148.5	1920	44	148
		50	1125	Positive		1080	5	36
	24Hz 1920x1080P	27	2750	Positive	74.25	1920	44	148
		24	1125	Positive		1080	5	36
	29.97Hz	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

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	30	1125	Positive		1080	5	36

Component timing table

	FREQ	PERIOD	SYNC	PIXEL	Display	SYNC	BACK
			POLARITY	CLOCK		WIDTH	PORCH
MODE
	LINE(kHz)	LINE (pixel)	LINE		LINE (pixel)	LINE (pixel)	LINE (pixel)
	FRAME	FIELD		(MHz)	FRAME	FRAME	FRAME
			FIELD
	(Hz)	(lines)			(lines)	(lines)	(lines)
59.94Hz 720x480i	15.734	858	Negative	13.5	712	64	62
	59.94	262.5	Negative		242	3	14
50Hz 720x576i	15.625	864	Negative	13.5	702	64	78
	50	312.5	Negative		287	2.5	20.5
59.94Hz 720x483P	31.47	858	Negative	27	720	63	59
	59.94	525	Negative		483	6	30
50Hz 720x576P	31.25	864	Negative	27	720	63	69
	50	625	Negative		576	5	39
59.94Hz 1280x720P	44.96	1650	Positive	74.176	1280	40	220
	59.94	750	Positive		720	5	20
60Hz 1280x720P	45	1650	Positive	74.25	1280	40	220
	60	750	Positive		720	5	20
50Hz 1280x720P	37.5	1920	Positive	74.25	1280	40	220
	50	750	Positive		720	5	20
59.94Hz 1920X1080i	33.72	2200	Positive	74.176	1920	44	148
	59.94	562.5	Positive		540	5	15
60Hz 1920X1080i	33.75	2200	Positive	74.25	1920	44	148
	60	562.5	Positive		540	5	15
50Hz 1920X1080i	28.13	2640	Positive	74.25	1920	44	148
	50	562.5	Positive		540	5	15

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