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

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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

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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

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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)
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

657.7mm x 506.5mm x 220mm

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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6 Volume Up Increase sound volume or select a control while in OSD menu.

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7 Volume Down Decrease sound volume or or select a control while in OSD menu.
8 CH Up Channel up when source is TV, or adjust a highlighted control while in OSD

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

OSD menu.

2.3 Rear View

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.

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

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After you input the channel numbers, press ENTER button to direct to the

channel immediately, or wait for 3 seconds to change automatically.
10 LAST Press to return to previous channel.
11 INFO Press this button to display the current state of the LCD TV.

12 CH
13 +VOL- Press to adjust the volume.

14 MUTE Press to turn off the sound. To restore the sound, press this button again, or

15 SOURCE

16 EXIT Press the button to exit the present menu.

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18 ENTER Press to confirm the selection in the OSD menu, or to enter the OSD menu you

19 GUIDE Press to display the Electronic Program Guide (EPG).

Press to change the channels up or down.

press the VOL+ / VOL- button.

Press to display the INPUT source list and select the source with

To confirm the selection, press ENTER.

Press these buttons to navigate the OSD menus.

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

select.

Pressing ENTER after you input channel numbers will change channels

immediately.

It contains the program information for the channel you’re watching.

/ buttons.

20 MENU Press to turn the OSD (On-Screen Display) menu on.
21 SLEEP 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.
22 PICTURE Press to adjust Picture mode.
23 WIDE Press to select Video Display format.
24 SOUND Press to adjust Sound mode.

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3. Function Description

3.1 Using the OSD Menu

3.1.1 Press POWER to to turn the LCD TV on.

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

3.1.3 Use

3.1.4 Use
setting.

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

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

to highlight an individual OSD option, then use to change the

3.1.6 Press MENU to exit the menu.

3.2 OSD Settings

3.2.1Video Settings

Brightness

Contrast Controls the difference between the brightest and darkest

Controls the overall brightness of the picture.

regions of the picture.

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Video

Sharpness

Picture Mode

Color

Tint

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

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

Controls the difference between the green and red regions of
the picture.

Backlight

Color Temperature

Memory Recall

Dark Room
Medium Room
Bright Room.

Warm

Cool

Neutral
Resets all settings of Video.

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3.2.2 Audio Settings

Audio

Bass

Controls the relative intensity of lower-pitched sounds.

Treble

Balance

Audio mode

Controls the relative intensity of higher pitched sounds.

Adjusts the relative volume of the speakers in a multiple speaker
system.

OFF TV Speaker

ON

Rock
POP
Classical
Flat

Audio Only

Memory Recall

Turns off video and gives out audio only. Press any key to show
video.

Resets all settings of Audio.

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3.2.3 Screen Settings

No Scale Displays the 1:1 size of the original content.

View Mode

3.2.4 TV Program Settings

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.

Overscan Enlarges the original picture horizontally and vertically to an equal

TV Program

When the source video is 16:9 in ratio, no change will occur.

aspect ratio that fills the screen. The redundant part of the upper,
bottom, left and right of the image will be removed.

Channel skip

Channel Skip List
Clear List

Channel Edit

Audio Language

Auto Scan

MTS

Channel Name Edit

Channel Name Edit
Allows you to assign a name to a
channel.

Mono
Mono
SAP

English
French
Spanish

Cable
Air

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3.2.5 Setup Settings

Setup Settings

Manual Add

Date and Time

Closed Captions

Parental Control

Channel Add
Enter
Add
Cancel

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
Analog Type
Digital Type
Font
Size
Font Color
Background Color
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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OSD Timeout

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OSD Language

en-C8 (Canada English Rating)

fr-8+ (Canada French Rating)

Channel Block

Change Password
10 sec

20 sec
30 sec

English
French
Spanish

Reset All

Version

3.2.6 How to get into the factory mode and Hospitality mode

Press ENTER to reset all settings and restore
defaults.

Press ENTER to view the current TV version.

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

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EXPLODED PARTS LIST ( VT2645-M )

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ViewSonic Model Number: VS12675
Rev: 1A

Item ViewSonic P/N Ref. P/N Description Q'ty

1
2 NA 13EB-11B0211 EB11 26 BUTTON BEZEL MO 1
3
4 C-00009761 13EB-11Q0301 EB11 26 STAND BASE 1
5
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
10 HW-00008943 131C-006B000 SCREW M3*8L*9D (X) W-NI #2 6
11
12
13
14
15
16
17
18
19 NA 13EB-0EL0223 EB0E 26 REAR LABEL 1
20
21

C-00009759

C-00009758

HW-00008942

HW-00008941

HW-00008944
HW-00008946
HW-00008947
HW-00008948
HW-00008949
HW-00008950
HW-00008951
HW-00008952

M-00008405
M-00008406

13EB-07B0201 B09 26 REAR COVER MO 1

13EB-11B0101 EB11 26 FRONT COVER MO 1

13EB-0EN0111 EB0E 26 CHASSIS R1.1 1

13EB-0EN0501 B17 26 TERMINAL BRACKET R1.0 1

131C-0040000 SCREW M3*8L (B) B-NI 15
131A-006C000 SCREW M4*6(K) W-NI #2 9
131A-007C000 SCREW M3*6L (WS) W-ZN 14
131A-007G000 SCREW M4*6L (W) W-NI 1
131A-0082000 SCREW M3*8L (X) B-NI 7
131C-001G000 SCREW M3*10L (B) B-NI #2 8
131C-003U000 SCREW M3*14L (B) B-NI #2 4
131A-000P000 SCREW M4*15L (W) B-NI #2 4

13EB-03U0201 B05 RUBBER FOOT D=12.1 4
13EB-03U0301 B05 RUBBER FOOT D=20.6 6

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19

Power Cable

8

Remote control with batteries

5

User Guide

6

7

4

9

1

2

10

11

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PACKING PART LIST ( VT2645-M )

ViewSonic Model Number: VS12675
Rev:

Item ViewSonic P/N Ref. P/N Description Q'ty

1TV1
2 STAND 1
3 Power Cable 1
4 Remote control 1
5

DC-00009821

6

DC-00009822

7 NA 1506-0B5D000 User Guide 1

P-00009734

8

P-00009735

9
10 P-00009736 1505-00YD000 EPS CUSHION VT3745-M(BR) 1
11

P-00009737

12 NA 1503-024V000 CARTON 1

1506-09L9000 Quick Start Guide BAG 1

1506-09UF000 Quick Start Guide 1

1505-00YB000 EPS CUSHION VT3745-M(TR) 1
1505-00YC000 EPS CUSHION VT3745-M(TL) 1

1505-00YE000 EPS CUSHION VT3745-M(BL) 1

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