ViewSonic VT2645-M, VS12675 Schematic

Service Manual

ViewSonic VT2645-M

Model No. VS12675

26” LCD TV

(VT2645-M_SM Rev. 1b Apr. 2010)

ViewSonic® 381 Brea Canyon Road, Walnut, California 91789 USA - [phone]

Copyright

Copyright© 2010 by ViewSonic Corporation. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of ViewSonic Corporation.

Disclaimer

ViewSonic makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranty of merchantability or fitness for any particular purpose. Further, ViewSonic reserves the right to revise this publication and to make changes from time to time in the contents hereof without obligation of ViewSonic to notify any person of such revision or changes.

Trademarks

Optiquest is a registered trademark of ViewSonic Corporation. ViewSonic is a registered trademark of ViewSonic Corporation.

All other trademarks used within this document are the property of their respective owners.

Revision History

Revision	SM Editing Date	ECR Number	Description of Changes	Editor
1a	12/22/09		Initial Release	Sophia Kao
1b	04/06/10		Add Factory & Hospitality mode	Sophia Kao

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UTABLE OF CONTENTS

Item		Page
1.	Precautions and Safety Notices	3
2.	Product Specification	6
3.	Function Description	10
4.	Block Diagram	16
5.	Exploded Diagram and Exploded Parts List	17
6.	Disassembly Procedure	20
7.	Recommended Spare Parts List	33
8.	BIOS /Firmware Update SOP	34
9.	Trouble Shooting Flow Chart	57
10.	FAQ	61

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1. Precautions and Safety Notices

Safety Instructions

The symbol is intended to alert the user to presence of un-insulated “Hazardous Voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

This symbol is intended to alert the user that improper use of the product may result in product malfunction. The user should pay attention to avoid accidents or unnecessary problems.

Wet Location

Apparatus shall not be exposed to dripping or splashing and that no objects filled with liquids, such as vases, shall be placed on the apparatus.

Outdoor Use

WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.

Disconnect Device - The Mains Plug or An Appliance Coupler

The mains plug or an appliance coupler is used as the disconnect device for disconnection from the mains, the disconnect device shall remain readily operable.

Safety

Operate the TV on 100V and 120V AC only.

Use the AC power cord specified by ViewSonic and suitable for the voltage where you use it.

The plug is designed, for safety purposes, to fit into the wall outlet only one way. If you are unable to insert the plug fully into the outlet, contact your dealer.

If any liquid or solid object should fall inside the cabinet, stop operating, unplug the TV immediately and have it checked by qualified service technician.

If you will not be using the TV for a long time, disconnect the power by pulling the plug itself. Do not pull on the cord.

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Carrying The TV

To prevent dropping the TV and causing serious injury, you must follow these guidelines:

Disconnect all cables before carrying the TV.

Carrying the large size TV requires at least two or three people.

When you carry the TV, place your hands as illustrated and hold it securely. Do not put stress on the LCD panel and the frame around the screen.

When carrying the TV, do not subject it to shocks, vibration, or excessive force. When lifting or moving the TV, hold it securely from the bottom. Place your palm directly under the panel.

Installed on the wall

Installed with stand

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Leave at least this space around the set. Do not install the TV set as follows: Air circulation is blocked.

Broken pieces

Do not throw anything at the TV.

Doing so may break the screen glass and cause serious injury.

If the surface of the TV cracks, unplug the AC power cord before touching the TV. Otherwise electric shock may result.

Handling of broken glass and liquid crystal leakage

If the LCD panel gets damaged, crystalline liquid leakage may occur, or scattered broken glass may result.

Do not touch broken glass or crystalline liquid which is toxic, with bare hands as cuts, poisoning or skin irritation may occur.

Also do not glass fragments or leaked crystalline liquid get into your eyes or mouth. Should either contacted your eyes or mouth, rinse the contacted area thoroughly with water and consult your doctor.

Note

This television includes a QAM demodulator, which should allow you to receive unscrambled digital cable television programming via subscription service to a cable service provider.

The type of programming and signal provided by your cable service provider will affect the availability of digital cable television programming in your area.

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2. Product Specification

2.1 Specification

Dimensions (with stand)	657.7mm x 506.5mm x 220mm
Physical(W)x(H)x(D)
Weight	7.3 kg
LCD	26” TFT Active Matrix RGB
Pixel Pitch	0.1405 (H) x 0.4215 (V) mm
Native Resolution	1366 x 768
Display area	575.769mm (H) x 323.712mm (V)
Speaker Output	5W x 2

Warning: Do not set the graphics card in your computer to exceed these refresh rates; doing so may result in permanent damage to the LCD TV.

2.2 Front View

Item			Description
1	Remote Control Receiver		Receives IR signals from the remote control.
2	Power LED Indicator		Lights up in blue when the TV is turned on. Lights up in orange when the TV
			is in standby mode.
3	Power ON/OFF button		Turn the power on from standby mode or turn the power off to return to the
			standby mode.
4	SOURCE		Select input source.
5	MENU		Turn OSD menu ON/OFF.

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6Volume Up

7Volume Down

8CH Up

9CH Down

2.3Rear View

Increase sound volume or select a control while in OSD menu. Decrease sound volume or or select a control while in OSD menu.

Channel up when source is TV, or adjust a highlighted control while in OSD menu.

Channel down when source is TV, or adjust a highlighted control while in OSD menu.

Item		Description
1	Power (AC input)	Plug-in the supplied AC Power cord and connect to the AC input power
		source (110~120V).
2	USB Service Port	Service only. Not available for users.
3	HDMI 1 / 2	Connect this port to the HDMI/HDMI-DVI jack of the compatible equipment.
		*If you use HDMI-DVI connections, please use PC Audio In for audio input.
4	PC Audio In	Connect the PC Audio Out on your computer to the PC Audio In on the rear
		of the LCD TV.
5	VGA Signal Input	Connect a 15-pin D-sub RGB cable to the RGB output of your computer
		and the other end to the RGB input on the rear of the LCD TV.
6	R/L Audio Inputs (YPbPr)	Connect to an external device, such as a VCR, STB, or a DVD player.
7	YPbPr	Connect to an external device, such as a VCR, STB, or a DVD player.
8	Coaxial	Connect to a digital audio receiver supporting the S/PDIF standard, such as
		a home theater receiver.

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9	S-Video Input	Connect to an external device, such as a VCR, STB, or a DVD player.
10	AV	Connect to an external device, such as a VCR, STB, or a DVD player.
11	R/L Audio Input (AV/S-Video)	Connect to an external device, such as a VCR, STB, or a DVD player.
12	TV Cable/Antenna	Connect to a cable or antenna TV.

2.4 Remote Control

Button		Description
1	POWER	Press this button to turn the power on from standby mode. Press it again to
		return to the standby mode.
2	FAV 1-3	Press to select favorite channels
3	TV	Press to direct to TV source when in any other source.
4	HDMI	Press to select source to HDMI or VGA mode.
5	YPbPr	Press to select source to YPbPr mode.
6	AV	Press to select source to AV or S-Video mode.
7	CC	Press to turn Closed Caption On/Off
8	MTS	Press to activate Multichannel Television Sound, Stereo or Mono.

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90~9, - number buttons

10LAST

11INFO

12CH

13+VOL-

14MUTE

15SOURCE

16EXIT

17

18ENTER

19GUIDE

20MENU

21SLEEP

22PICTURE

23WIDE

24SOUND

Press 0~9 and “-” to select a channel.

After you input the channel numbers, press ENTER button to direct to the channel immediately, or wait for 3 seconds to change automatically. Press to return to previous channel.

Press this button to display the current state of the LCD TV. Press to change the channels up or down.

Press to adjust the volume.

Press to turn off the sound. To restore the sound, press this button again, or press the VOL+ / VOLbutton.

Press to display the INPUT source list and select the source with / buttons. To confirm the selection, press ENTER.

Press the button to exit the present menu.

Press these buttons to navigate the OSD menus.

/is for function select, and is for function adjustment.

Press to confirm the selection in the OSD menu, or to enter the OSD menu you select.

Pressing ENTER after you input channel numbers will change channels immediately.

Press to display the Electronic Program Guide (EPG).

It contains the program information for the channel you’re watching. Press to turn the OSD (On-Screen Display) menu on.

Press repeatedly to set the off timer.

The function is used to automatically shut off the LCD TV after a preset period of time passed. There are several times for choice – Off, 15 Min, 30 Min, 45 Min, 60 Min, 75 Min, 90 Min, 105 Min, and 120 Min.

Press to adjust Picture mode.

Press to select Video Display format. Press to adjust Sound mode.

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3. Function Description

3.1 Using the OSD Menu

3.1.1Press POWER to to turn the LCD TV on.

3.1.2Press MENU on the remote control to display the Main menu.

3.1.3Use to highlight an OSD Menu and press ENTER to enter the OSD Menu.

3.1.4Use to highlight an individual OSD option, then use to change the setting.

3.1.5Press ENTER to enter next OSD layer, use to change the setting, then press ENTER to confirm.

3.1.6Press MENU to exit the menu.

3.2 OSD Settings

3.2.1Video Settings

Brightness

Controls the overall brightness of the picture.

Contrast	Controls the difference between the brightest and darkest
	regions of the picture.

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Video

Sharpness	Increase this setting to see crisp edges in the picture;
	decrease it for soft edges.

Picture Mode	Show room
	Movie
	Game
	Sports
	Custom
	Controls the overall color of the picture.
Color

Tint	Controls the difference between the green and red regions of
	the picture.
Backlight	Dark Room
	Medium Room
	Bright Room.
Color Temperature
	Warm
	Cool
	Neutral
	Resets all settings of Video.
Memory Recall

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3.2.2 Audio Settings

Audio	Bass	Controls the relative intensity of lower-pitched sounds.
		Controls the relative intensity of higher pitched sounds.
	Treble
	Balance	Adjusts the relative volume of the speakers in a multiple speaker
		system.
	TV Speaker	OFF
		ON
	Audio mode	Rock
		POP
		Classical
		Flat
	Audio Only	Turns off video and gives out audio only. Press any key to show
		video.
		Resets all settings of Audio.
	Memory Recall

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3.2.3 Screen Settings

	No Scale	Displays the 1:1 size of the original content.
View Mode
	Normal	Keeps the source display ratio. If the original input content is 4:3, then
		shows 4:3. If the original input content is 16:9, then shows 16:9.
	Full	Enlarges the standard 4:3 source video to the 16:9 full screen video.
		When the source video is 16:9 in ratio, no change will occur.
	Overscan	Enlarges the original picture horizontally and vertically to an equal
		aspect ratio that fills the screen. The redundant part of the upper,
		bottom, left and right of the image will be removed.

3.2.4 TV Program Settings

TV Program	Channel skip	Channel Skip List
		Clear List
		Channel Name Edit
	Channel Edit	Channel Name Edit
		Allows you to assign a name to a
		channel.
	MTS	Mono
		Mono
		SAP
	Audio Language	English
		French
		Spanish
	Auto Scan	Cable
		Air

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	Manual Add	Channel Add
		Enter
		Add
		Cancel

3.2.5 Setup Settings

	Date and Time	Date. Allows the user to set the current time
		Day of Week
		Time Zone
		Current Time
		Adjust for Daylight Saving Time
		Auto Calibration
	Closed Captions	Closed Captions
		Analog Type
		Digital Type
		Font
		Size
		Font Color
		Background Color
Setup Settings	Parental Control	Enter Password
		Rating	Select ON/OFF to
		activate/deactivate the Rating programs.
		Block Unrated
		TV-Y (TV Rating)
		MPAA (MPAA Rating)

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		en-C8 (Canada English Rating)
		fr-8+ (Canada French Rating)
		Channel Block
		Change Password
	OSD Timeout	10 sec
		20 sec
		30 sec
	OSD Language	English
		French
		Spanish
	Reset All	Press ENTER to reset all settings and restore
		defaults.
	Version	Press ENTER to view the current TV version.

3.2.6 How to get into the factory mode and Hospitality mode

Factory model: Enter OSD "Setting" -> "Version" -> press arrow UP + "-" + ENTER+ENTER Carnival (Hospitality) model: Pressing "Menu" and then "9876" key.

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4. Block Diagram

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5. Exploded Diagram and Exploded Parts List

orpCci n Sowei V

M- 2645VT 17 opyCt o No D- alit n idefno C

EXPLODED PARTS LIST ( VT2645-M )

ViewSonic Model Number: VS12675

Rev: 1A

Item	ViewSonic P/N	Ref. P/N	Description	Q'ty
1	C-00009759	13EB-07B0201	B09 26 REAR COVER MO	1
2	NA	13EB-11B0211	EB11 26 BUTTON BEZEL MO	1
3	C-00009758	13EB-11B0101	EB11 26 FRONT COVER MO	1
4	C-00009761	13EB-11Q0301	EB11 26 STAND BASE	1
5	HW-00008942	13EB-0EN0111	EB0E 26 CHASSIS R1.1	1
6	HW-00008939	13EB-0EN0201	B17 26 BRACKET1 R1.0	1
7	HW-00008940	13EB-0EN0411	EB0E 26 BRACKET2 R1.1	2
8	C-00009760	13EB-0EQ0711	EB0E 26 BASE SUPPORT R1.1	1
9	HW-00008941	13EB-0EN0501	B17 26 TERMINAL BRACKET R1.0	1
10	HW-00008943	131C-006B000	SCREW M3*8L*9D (X) W-NI #2	6
11	HW-00008944	131C-0040000	SCREW M3*8L (B) B-NI	15
12	HW-00008946	131A-006C000	SCREW M4*6(K) W-NI #2	9
13	HW-00008947	131A-007C000	SCREW M3*6L (WS) W-ZN	14
14	HW-00008948	131A-007G000	SCREW M4*6L (W) W-NI	1
15	HW-00008949	131A-0082000	SCREW M3*8L (X) B-NI	7
16	HW-00008950	131C-001G000	SCREW M3*10L (B) B-NI #2	8
17	HW-00008951	131C-003U000	SCREW M3*14L (B) B-NI #2	4
18	HW-00008952	131A-000P000	SCREW M4*15L (W) B-NI #2	4
19	NA	13EB-0EL0223	EB0E 26 REAR LABEL	1
20	M-00008405	13EB-03U0201	B05 RUBBER FOOT D=12.1	4
21	M-00008406	13EB-03U0301	B05 RUBBER FOOT D=20.6	6

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3

Cable

Power

8

				batteries
				with
		Remote	control
				4
	User	Guide	5
			6	9
			7

1

2

11

10

12

PACKING PART LIST ( VT2645-M )

ViewSonic Model Number: VS12675

Rev:

Item	ViewSonic P/N	Ref. P/N	Description	Q'ty
1			TV	1
2			STAND	1
3			Power Cable	1
4			Remote control	1
5	DC-00009821	1506-09L9000	Quick Start Guide BAG	1
6	DC-00009822	1506-09UF000	Quick Start Guide	1
7	NA	1506-0B5D000	User Guide	1
8	P-00009734	1505-00YB000	EPS CUSHION VT3745-M(TR)	1
9	P-00009735	1505-00YC000	EPS CUSHION VT3745-M(TL)	1
10	P-00009736	1505-00YD000	EPS CUSHION VT3745-M(BR)	1
11	P-00009737	1505-00YE000	EPS CUSHION VT3745-M(BL)	1
12	NA	1503-024V000	CARTON	1

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