ViewSonic VX2262wm wmp, VS12132 Schematic

Service Manual

ViewSonic VX2262wm/wmp

Model No VS12132

22” Color TFT LCD Display

Manufacture Date: Apr-24-08

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Copyright Information

Copyright © ViewSonic® Corporation, 2006. All rights reserved.

Macintosh and Power Macintosh are registered trademarks of Apple Computer, Inc. Microsoft, Windows, Windows NT, and the Windows logo are registered trademarks of Microsoft Corporation in the United States and other countries.

ViewSonic, the three birds logo, OnView, ViewMatch, and ViewMeter are registered trademarks of ViewSonic Corporation.

VESA is a registered trademark of the Video Electronics Standards Association. DPMS and DDC are trademarks of VESA.

ENERGY STAR® is a registered trademark of the U.S. Environmental Protection Agency (EPA). As an ENERGY STAR® partner, ViewSonic Corporation has determined that this

product meets the ENERGY STAR® guidelines for energy efficiency.

Disclaimer: ViewSonic Corporation shall not be liable for technical or editorial errors or omissions contained herein; nor for incidental or consequential damages resulting from furnishing this material, or the performance or use of this product.

In the interest of continuing product improvement, ViewSonic Corporation reserves the right to change product specifications without notice. Information in this document may change without notice.

No part of this document may be copied, reproduced, or transmitted by any means, for any purpose without prior written permission from ViewSonic Corporation.

Copyright © ViewSonic® Corporation, 2006. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into

any language or manual or otherwise, without the prior written permission of ViewSonic® Corporation.

Revision History

	Revision	Date	Description of changes	Approval
	A01	Apr-24-08	Initial Release	YG.WANG
			TC8MM8MKWHVSD1J

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	TABLE OF CONTENTS
1. Precautions And Safety Notices		4
2.	Specification	7
3. Front Panel Control And Indicators		10
4. Circuit Description		17
5. Adjustment Procedure		25
6. Troubleshooting Flow Chart		43
7.	Recommended Spare Parts List	44
8.	Exploded Diagram And Spare Parts List	60
9.	Disassemble Process	64
10. Block Diagram		68
11. Schematic Diagram		69
12. PCB Layout Diagram		77

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1. Precautions And Safety Notices

1.1 SAFETY PRECAUTIONS

This monitor is manufactured and tested on a ground principle that a user’s safety comes first. However, improper use or installation may cause damage to the monitor as well as the user. Carefully go over the following WARNINGS before installing and keep this guide handy.

WARNINGS

This monitor should be operated only at the correct power sources indicated on the label on the rear end of the monitor. If you’re unsure of the power supply in your residence, consult you local dealer or power company.

Use only the special power adapter that comes with this monitor for power input.

Do not try to repair the monitor your self as it contains no user-serviceable parts. This monitor should only be repaired by a qualified technician.

Do not remove the monitor cabinet. There is high-voltage parts inside that may cause electric shock to human bodies, even when the power cord is unplugged.

Stop using the monitor if the cabinet is damaged. Have it checked by a service technician.Put your monitor only in a clean, dry environment. If it gets wet, unplug the power cable

immediately and consult your service technician.

Always unplug the monitor before cleaning it .Clean the cabinet with a clean, dry cloth. Apply non-ammonia based cleaner onto the cloth, not directly onto the glass screen.

Keep the monitor away from magnetic objects, motors, TV sets, and transformer.Do not place heavy objects on the monitor or power cord.

1.2PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety visual inspections and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltages, wattage, etc. Before replacing any of these components read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire ,or other hazards.

1.3SERVICE NOTES

1.When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.

2.When replacing a high wattage resistor(more than 1W of metal oxide film resistor) in circuit board, keep the resistor about 5mm away from circuit board.

3.Keep wires away from high voltage, high temperature components and sharp edges.

4.Keep wires in their original position so as to reduce interference.

5.Usage of this product please refer to also user’s manual.

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1.4HANDING AND PLACING METHODS

Correct Methods:	Incorrect Methods:

Only touch the metal frame of the LCD panel or the front cover of the monitor. Do not touch the surface of the polarizer.

Surface of the LCD panel is pressed by fingers and that may cause “Mura.”

	Take out the monitor with cushions	Taking out the monitor by grasping the LCD
		panel. That may cause “Mura.”

Place the monitor on a clean and soft foam pad.

Placing the monitor on foreign objects. That could scratch the surface of the panel or cause “Mura.”

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Place the monitor on the lap, the panel surface must be upwards.

The panel is placed facedown on the lap. That may cause “Mura.”

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2.Specification

2.1PRODUCT SPECIFICATIONS

LCD	Type
	Color Filter
	Glass Surface
Input Signal	Video Sync
Compatibility	PC
	Macintosh
Resolution	Recommended
	and supported

	Power	Voltage
	Display area	Full Scan
	Operating	Temperature
		Humidity
	conditions
		Altitude
	Storage	Temperature
		Humidity
	conditions
		Altitude
	Dimensions	Physical
	Weight	Physical
	Regulations
	Power saving	On
	modes	Off

22” (full 22” wide viewable diagonal area),

TFT(Thin Film Transistor), Active Matrix WXGA+LCD, 0.282mm pixel pitch

RGB vertical stripe Anti-Glare

RGB analog(0.7/1.0 Vp-p, 75ohms)/TMDS Digital(100ohms) Composite Sync, Separate Sync, Sync on Green

Fh:24-83 kHz, Fv:50-76 Hz

Up to 1680 x 1050 Non-interlaced Power Macintosh up to 1680 x 1050

1680 x 1050 @ 60 Hz

1440 x 900 @ 60, 75 Hz

1280 x 1024 @ 60, 75 Hz

1024 x768 @ 60, 70, 72, 75 Hz

800 x 600 @ 56, 60, 72, 75 Hz

640 x 480 @ 60, 75 Hz

720 x 400 @ 70 Hz

100V~240 VAC, 50/60Hz (auto switch)

473.76mm(H) x 296.1mm(V) 18.65”(H) x 11.66”(V)

32°F to + 104°F( 0°C to + 40°C) 10%C to + 90%(non-condensing) To 10,000 feet

-4°F to + 140°F( -20°C to + 60°C) 10%C to + 90%(non-condensing) To 40,000 feet

508.7mm(W) x 440.55mm(H) x 202.84mm(D) 20.02”(W) x 17.34”(H) x 7.98”(D)

12.23 Ib(5.56 kg)

BSMI, VCCI,CCC, PSB, C-Tick, MIC, CE, Gost-R/Hygienic, Ukraine, MPRII, ISO13406-2, SASO, TUVdotcom, UL/cUL,

FCC-B, ICES-B, TUV-S/IRAM/UL-AR S Mark, NOM,

®

ENERGY STAR

45W (Typical) (blue LED) <1W

Preset Timing Mode (pre-adjusted to VESA® 1680 x 1050 @ 60 Hz)

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 display.

1 Macintosh computers older than G3 require a ViewSonic® Macintosh adapter. To order an adapter, contact ViewSonic.

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2.2 INTERFACE DESCRIPTION

D-SUB 15 PIN CONNECTOR

1	5
6	10
11	15

Pin Number	Pin Function
1	Red video input
2	Green video input
3	Blue video input
4	No Connection
5	Ground
6	Red video ground
7	Green video ground
8	Blue video ground
9	+5V
10	H/V sync ground
11	No connection
12	(SDA)
13	Horizontal sync (Composite sync)
14	Vertical sync
15	(SCL)

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DVI-D 24 PIN CONNECTOR

	Pin No.	Signal Name		Description
	1	RX2-	TMDS negative differential input, channel 2
	2	RX2+	TMDS positive differential input, channel 2
	3	GND	Logic Ground
	4	Reserved 4	Reserved. No connection
	5	Reserved 5	Reserved. No connection
	6	DDC-CLK	DDC2B Clock
	7	DDC-DAT	DDC2B Data
	8	Reserved 8	Reserved. No connection
	9	RX1-	TMDS negative differential input, channel 1
	10	RX1+	TMDS positive differential input, channel 1
	11	GND	Logic Ground
	12	Reserved 12	Reserved. No connection
	13	Reserved 13	Reserved. No connection
	14	VCCX	Power
	15	GND	Logic Ground
	16	SENS	SENSE Pin, Pull High
	17	RX0-	TMDS negative differential input, channel 0
	18	RX0+	TMDS positive differential input, channel 0
	19	GND	Logic Ground
	20	Reserved 20	Reserved. No connection
	21	Reserved 21	Reserved. No connection
	22	GND	Logic Ground
	23	RXC+	TMDS positive differential input, reference clock
	24	RXC-	TMDS negative differential input, reference clock
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3.Front Panel Function Controls And Indicators

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Do the following to adjust the display setting: 1. To display the Main Menu, press button [1].

NOTE: All OSD menus and adjustment screens disappear automatically after about 15 seconds. This is adjustable through the OSD timeout setting in the setup menu.

2.To select a control to adjust, press ▲or ▼ to scroll up or down in the Main Menu.

3.After the desired control is selected, press button [2]. A control screen like the one shown below appears.

The line at the bottom of the screen shows the current functions of buttons 1 and 2: Exit or select the Brightness control.

4.To adjust the control, press the up ▲ or▼ down buttons.

5.To save the adjustments and exit the menu, press button [1] twice.

The following tips may help you optimize your display:

•Adjust the computer's graphics card so that it outputs a 1680 x 1050 @ 60Hz video signal to the LCD display. (Look for instructions on “changing the refresh rate” in the graphics card's user guide.)

•If necessary, make small adjustments using H. POSITION and V. POSITION until the screen image is completely visible. (The black border around the edge of the screen should barely touch the illuminated “active area” of the LCD display.)

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Main Menu Controls

Adjust the menu items shown below by using the up and down buttons.

Control	Explanation
	Auto Image Adjust automatically sizes, centers, and fine tunes the video
	signal to eliminate waviness and distortion. Press the [2] button to obtain a
	sharper image.
	NOTE: Auto Image Adjust works with most common video cards. If this
	function does not work on your LCD display, then lower the video refresh rate
	to 60 Hz and set the resolution to its pre-set value.
	Contrast adjusts the difference between the image background (black level)
	and the foreground (white level).
	Brightness adjusts background black level of the screen image.
	Input Select toggles between inputs if you have more than one computer
	connected to the LCD Display.

Audio Adjust

Volume increases the volume, decreases the volume, and mutes the audio. Mute temporarily silences audio output.

Color Adjust provides several color adjustment modes, including preset color temperatures and a User Color mode which allows independent adjustment of red (R), green (G), and blue (B). The factory setting for this product is 6500K (6500 Kelvin).

sRGB-This is quickly becoming the industry standard for color management, with support being included in many of the latest applications. Enabling this setting allows the LCD display to more accurately display colors the way they were originally intended. Enabling the intended. Enabling the sRGB setting will cause Contrast and Brightness adjustments to be disabled.

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9300K-Adds blue to the screen image for cooler white (used in most office settings with fluorescent lighting).

7500K-Adds blue to the screen image for cooler white(used in most office settings with fluorescent lighting).

6500K-Adds red to the screen image for warmer white and richer red.

5000K-Adds green to the screen image for a darker color.

User Color Individual adjustments for red (R), green (G), and blue (B).

1.To select color (R, G or B) press button [2].

2.To adjust selected color, press ▲ and▼.

Important: If you select RECALL from the Main Menu when the product is set to a Preset Timing Mode, colors return to the 6500K factory preset.

Information displays the timing mode (video signal input) coming from the graphics card in the computer, the LCD model number, the serial number, and

the ViewSonic® website URL. See your graphics card’s user guide for instructions on changing the resolution and refresh rate (vertical frequency). NOTE: VESA 1680 x 1050 @ 60Hz (recommended) means that the resolution is 1680 x 1050 and the refresh rate is 60 Hertz.

Manual Image Adjust display the Manual Image Adjust menu

H./V. Position (Horizontal/Vertical Position) moves the screen image left or right and up or down.

H. Size (Horizontal Size) adjusts the width of the screen image.

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Fine Tune sharpens the focus by aligning text and/or graphics with pixel boundaries.

NOTE: Try Auto Image Adjust first.

Sharpness adjusts the clarity and focus of the screen image.

Dynamic Contrast allows the user to turn the contrast ratio enhancement on or off.

Aspect ratio Selects the image size for 4:3, fill aspect ratio & full screen.

Response Time adjusts the response time of liquid-crystal display for image quality enhancement.

Setup Menu displays the menu shown below:

Language Select allows the user to choose the language used in the menus and control screens.

Resolution Notice advises the optimal resolution to use.

OSD Position allows the user to move the OSD menus and control screens.

OSD Timeout sets the length of time the OSD screen is displayed. For example, with a “15 second” setting, if a control is not pushed within 15 seconds, the display screen disappears.

OSD Background allows the user to turn the OSD background On or Off.

Memory Recall returns the adjustments back to factory settings if the display is operating in a factory Preset Timing Mode listed in the Specifications of this manual.

Exception: This control does not affect changes made with the User Color control, Language Select or Power Lock setting.

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SHORT CUTS FUNCTION FROM THE BUTTONS

	[1]	Main Menu
	[2]	Input toggle (D-sub/DVI); refer to Appendix D)
	[▼]	To immediately activate Audio menu.
		To immediately activate Contrast menu. It should be change
	[▲]	to Brightness OSD by push button [2]
		*1 refer to the Brightness OSD
		*2 Under sRGB or DCR mode, this function is disabled.
		1. In the CR/ BT menu, Recall both of Contrast and
	[▼] + [▲]	Brightness to default without OSD message.
		2. In the Audio menu, Recall both of audio volume and mute
		to default without OSD message.
		1. Toggle 720x400 and 640x400 mode when input 720x400
	[1] + [2]	or 640x400 mode.
		2. Toggle 1400x1050 and 1680x1050 mode when input
		1400x1050 or 1680x1050mode.
		White Balance
		1. It will not shown on user’s guide
		2. OSD message as below,
								(Image = no blanking)
	[1] + [▼] + [▲]	3. Recommend environment
		3.1. Optical (Best) input timing = 640 x 480 @ 60Hz;
	(Keep pushing 5 sec)			Following timing modes also recommended,
				800 x 600 @ 60 Hz
		1024 X 768 @ 60 Hz
		3.2. Pattern as below,
	[1] + [▲]	OSD Lock / Unlock
	[1] + [▼]	Power Lock / Unlock
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Toggle DDC/CI and DDC/2B (DDC/CI enable/disable) and show following message for 3 seconds,

When switch to DDC/CI

[2] + [▼]

When switch to DDC/2B

Default = DDC/CI

Signal + [2] + [ ]

Factory Mode

Remark : All the short cuts function are only available while OSD off

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4.Circuit Description

4.1LCD MONITOR DESCRIPTION

The LCD MONITOR will contain a Main Board, an Power Board, Key Board which

house the flat panel control logic, brightness control logic and DDC.

Monitor Block Diagram

CCFL Drive.	Flat Panel and
	CCFL backlight

								RS232 Connector
Power Board			Main Board
								For white balance
(Include: adapter, inverter)
								adjustment in factory
								mode
								Video signal, DDC
		Key Board
AC-IN
					HOST Computer
100V-240V

4.2MAIN BOARD BLOCK FUNCTION DESCRIPTION

The main board contains panel control logic, brightness control logic, DDC and DC

convert DC circuit and so on.

PWPC board

R

G

B

Backlight and Panel

H

TSUMO58CWHL-LF

V

SDA

SCL

OSC

Flash memory

Keyboard

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4.3 PWPC BOARD BLOCK FUNCTION DESCRIPTION

PWPC board combines to adapter and inverter, Adapter which commonly consists of bridge rectifier and filter, start circuit, PWM control circuit, protection circuits and convert to 16V, 5V,5.1V DC voltage by input 90V-240V AC voltage that provide power supply for each chips in the main board and inverter. Inverter is DC TO AC circuit. It changes the 16v DC of power supply to about 600-800v AC that drives the backlight. It mostly consists of starting circuit, PWM controller, DC changing circuit, LC surging circuit, output circuit and protection circuit etc.

AC input

Bridge

Rectifier

Transformer

EMI filter

Rectifier

CMOS

and Filter

Start Circuit

R904, R905, R906

CN902

5V

PWM

Over

5.1V

Control IC

Voltage

Protect

ON/OF

OSC and

MOSFET

Output

DC Convert

Q804,Q809

16V

Circuit

Circuit

Lamp

Feedback

Over

ON/OFF

PWM

Circuit

Voltage

Control

Control IC

DIM

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4.4 INTRODUCTION OF IC

TSUMO58CWHL-LF(U401): integrate ADC, OSD, SCALER, MCU, LVDS, convert analog RGB into digital and room and shrink scaling output to LCD panel.

PIN Function:

	Pin	Symbol		Description
	41	SDO	SPI flash serial data output
	42	CSZ	SPI flash chip select
	43	SCK	SPI flash serial select
	44	SDI	SPI flash serial data input
	34	DDCA_SDA/RS232_TX	DDC Data for analog interface/
			UART	Ttransmitter /
			General	Purpose	Input/Output;
			4mA driving strength
	35	DDCA_SCL/RS232_RX	DDC Clock for analog interface/
			UART Receiver /
			General	Purpose	Input/Output;
			4mA driving strength
	5	DDCD_SDA	DDC Data and HDCP Slave Serial
			Port Data for DVI/HDMI Interface;
			4mA driving strength
	6	DDCD_SCL	DDC Clock and HDCP Slave
			Serial Port Data for DVI/HDMI
			Interface
	102	BYPASS	For External Bypass Capacitor
	108	RST	Chip reset; High reset
	103	VCTRL	Regulator control
	32	HSYNCO	Analog HSYNC input
	33	VSYNCO	Analog VSYNC input
	31	REFP	Internal ADC top de-coupling pin
	30	REFM	Internal ADC bottom de-coupling
			pin
	7	REXT	External resistor 390 ohm to
			AVDD_33
	37	MODE	Chip Configuration		Input; 10K
			ohm pull-low for normal operation
	128	XIN	Xin; Crystal Oscillator Input
	127	XOUT	Xout; Crystal Oscillator Output
	8,12,20	AVDD 33	ADC Analog Power 3.3V
	21	AVDD 18	ADC Analog Power 1.8V
	40,54,58-60,65,66,71,87,107	VDDP	Digital Output Power 3.3V
	112,114
			Digital Core Power 1.8V
	53,74,104,126	VDDC
	1,11,17,29,52,62,63,68,69,72,	GND	Ground
	88,101,105,106,113

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AP1117D33LA(701): DC power convert, convert to 3.3v.

SST25LF020A-33-4C-SAE(U402): SST’s serial flash family features a four-wire, SPI-com-patible interface that allows for a low pin-count package occupying less board space and ultimately lowering total system costs. The SST25LF020A/040A devices significantly improve performance, while lowering power consumption. The total energy consumed is a function of the applied voltage, current, and time of application. The SST25LF020A/040A devices operate with a single 3.0-3.6V power supply. The SST25LF020A devices are offered in an 8-lead SOIC 150 mil body width (SA) package.

Pin Diagram:

PIN Descriptions:

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	Symbol	Pin Name	Functions
			To provide the timing of the serial interface.
	SCK	Serial Clock	Commands, addresses, or input data are latched on the
			rising edge of the clock input, while output data is shifted out
			on the falling edge of the clock input.
		Serial Data	To transfer commands, addresses, or data serially into the
	SI		device.
		Input	Inputs are latched on the rising edge of the serial clock.
	SO	Serial Data	To transfer data serially out of the device.
		Output	Data is shifted out on the falling edge of the serial clock.
			The device is enabled by a high to low transition on CE#.
	CE#	Chip Enable	CE# must remain low for the duration of any command
			sequence.
	WP#	Write Protect	The Write Protect (WP#) pin is used to enable/disable BPL
			bit in the status register.
	HOLD#	Hold	To temporarily stop serial communication with SPI flash
			memory without resetting the device.
	VDD	Power Supply	To provide power supply(3.0-3.6V)
	VSS	Ground

Circuit Diagram

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LD7552DPS (IC901): PWM control, high-voltage startup current. The circuit unit has functions such as over-current protection, over-voltage protection, output short-circuit protection and etc. The function of each pin and the inside circuit diagram are as follows:

	Pin	Name	Function
	1	GND	Ground
			Voltage feedback pin (same as the COMP pin in UC384X), By
	2	COMP	connecting a photo-coupler to close the control loop and achieve the
			regulation
	3	VCC	Supply voltage pin
	4	RT	This pin is to program the switching frequency. By connecting a resistor
			to ground to set the switching frequency.
	6	NC	Unconnected pin
	7	VCC	Supply voltage pin
	8	OUT	Gate drive output to drive the external MOSFET

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TL494IDR(IC801): The TL494 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application.

PIN Descriptions:

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5. Adjustment Procedure

5.1ADJUSTMENT CONDITIONS AND PRECAUTIONS

1.Approximately 30 minutes should be allowed for warm up before proceeding.

2.Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory.

3.ESD protection is needed before adjustment.

5.2MAIN ADJUSTMENTS

NO.	FUNCTIONS	DESIGNATION
1.	White Balance	Function Key
2.	Geometry	Function Key

5.3ALIGNMENT PROCEDURES

Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment.

1.Adjust of White Balance

1.) How to do the CA-210 MEM .Channel setting

A Reference to CA-210 user guide

B Use “ MODE” key to modify x y Lv value and use “MEMORY CH” key to modify the TEXT description Following is the procedure to do white-balance adjust

2.) Setting the color temp. You want
A MEM.CHANNEL1 ( 9300 color):
9300 color temp. parameter is	x = 0.283 ±0.003;	y = 0.298 ±0.003;
Lv ≥ 175 cd/m2 ,
B MEM.CHANNEL 1 ( 7500 color):
7500 color temp. parameter is	x = 0.299±0.003;	y = 0.315 ±0.003;
Lv ≥ 188cd/m2,
C MEM.CHANNEL1 ( 6500 color):
6500 color temp. parameter is	x = 0.313±0.003;	y = 0.329 ±0.003;
Lv ≥ 213cd/m2,
D MEM.CHANNEL 1 ( 5000 color):
5400 color temp. parameter is	x = 0.346±0.003;	y = 0.359 ±0.003;
Lv ≥ 175cd/m2,

E MEM.CHANNEL1 ( SRGB color):

SRGB color temp. parameter is x=0.313±0.003; y=0.329±0.003; Lv≥85cd/m2, 3.) Into factory mode of VX2262wm/wmp:

First Power off, then press Switch 1 button along with press Power button will activate the factory mode, then MCU will do AUTO LEVEL automatically. Meanwhile press MENU the OSD screen will located at LEFT TOP OF PANEL.

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