Viewsonic VA712B-2, VA712-2 SERVICE MANUAL A01

Service Manual

ViewSonic VA712b-2

Model No VS10901

17” Color TFT LCD Display

Manufacture Date: Mar-30-06

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Copyright

Copyright © 2005 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 manual or otherwise, without the prior written permission of ViewSonic Corporation.

Disclaimer

ViewSonic® makes no representation or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranty of merchantability of 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 trademark used within this document are the property of their respective owners.

Revision History

Revision	Date	Description of changes	Approval
A00	Sep-9-05	Initial Release	YG.WANG
		Update the Handing and Placing Methods
A01	Mar-30-06	and the Circuit Description and the	YG.WANG
		Adjustment Procedure

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	TABLE OF CONTENTS
1. Precautions And Safety Notices		4
2.	Specification	7
3. Front Panel Control And Indicators		11
4.	Circuit Description	17
5. Adjusting Procedure		27
6. Troubleshooting Flow Chart		47
7.	Recommended Spare Parts List	48
8.	Exploded Diagram And Spare Parts List	66
9.	Disassemble Process	70
10. Block Diagram		75
11. Schematic Diagram		76
12. PCB Layout Diagram		83

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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.”

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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.”

Place the monitor on the lap, the panel	The panel is placed facedown on the lap. That
surface must be upwards.	may cause “Mura.”

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2.Specification

2.1PRODUCT SPECIFICATIONS

	LCD Panel	17.0” TFT
	Recommend Resolution	1280 x1024@60Hz
	Pixel Dimension	0.264(H) x 0.264(V)mm
	LCD Display Color	16.2M Colors (RGB 6-bit+FRC data)
	Viewing Angle	Horizontal: 140 °
		Vertical: 130 °
	Contrast Ratio	500 1 (Typ.)
	Brightness	300 cd/ (Typ.)
	Response Time	8ms(Typ.)
	Active Display Area	337.9mm(H) x 270.3mm(V)
	Maximum Pixel Clock	135 MHz
	Horizontal Frequency	30 – 82 kHz
	Vertical Refresh Rate	50 – 85 Hz.
	Temperature	Operating: 0°C to +40°C
		Storage: -20°C to +60°C
	Input Signal	Analog / Digital
		Energy Star compliant VESA
	Power Management	DPMS compatible
		1 W
	Power	Input Voltage : 90V~264ACV 50~60Hz(auto switch)
		Consumption: 39 Watts(Max.) 36 Watts(Typ.)
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2.2 FACTORY SUPPORTING MODES

Timing Table :

Item		Timing	Analog	Digital
1	640 x 350	@ 70Hz, 31.5kHz	Yes	Yes
2	640 x 480	@ 60Hz, 31.5kHz	Yes	Yes
3	640 x 480	@ 67Hz, 35.0kHz	Yes	Yes
4	640 x 480	@ 72Hz, 37.9kHz	Yes	Yes
5	640 x 480	@ 75Hz, 37.5kHz	Yes	Yes
6	640 x 480 @ 85Hz, 43.27kHz		Yes	Yes
7	720 x 400	@ 70Hz, 31.5kHz	Yes	Yes
8	800 x 600	@ 56Hz, 35.1kHz	Yes	Yes
9	800 x 600	@ 60Hz, 37.9kHz	Yes	Yes
10	800 x 600	@ 72Hz, 48.1kHz	Yes	Yes
11	800 x 600	@ 75Hz, 46.9kHz	Yes	Yes
12	800 x 600	@ 85Hz, 53.7kHz	Yes	Yes
13	832 x 624	@ 75Hz, 49.7kHz	Yes	Yes
14	1024 x 768 @ 60Hz, 48.4kHz		Yes	Yes
15	1024 x 768 @ 70Hz, 56.5kHz		Yes	Yes
16	1024 x 768 @ 72Hz, 58.1kHz		Yes	Yes
17	1024 x 768 @ 75Hz, 60.0kHz		Yes	Yes
18	1024 x 768	@ 85Hz, 68.67kHz	Yes	Yes
19	1152 x 870 @ 75Hz, 68.6kHz		Yes	Yes
20	1280 x 1024 @ 60Hz, 63.4kHz		Yes	Yes
21	1280 x 1024 @ 75Hz, 79.97kHz		Yes	Yes
22	1280 x 720 @ 60Hz, 45kHz		Yes	Yes

Primary Preset: VESA : 1280 x1024@60Hz

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2.3 INTERFACE DESCRIPTION

D-SUB 15 PIN CONNECTOR

1	5
6	10
11	15

SIGNAL LEVEL

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 command line at the bottom of the control screen tells what to do next from this screen. You can toggle between control screens, adjust the selected option, or exit the screen.

4.To adjust the setting, press the up ▼ or ▲ down T 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 1280 x 1024 @ 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 sizes and centers the screen image automatically.

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 allows the user to toggle between an analog and a digital signal.

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).

9300K-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. 5400K-Adds green to the screen image for a darker color. 5000K-Adds blue and 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.

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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 1280 x 1024 @ 60Hz (recommended) means that the resolution is 1280 x 1024 and the refresh rate is 60 Hertz.

Manual Image Adjust Sub-menu

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

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

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.

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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 allows the user to enable or disable this notice.

If you enable the Resolution Notice shown above and your computer is set at a resolution other than 1280 x 1024, the following screen appears.

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 “30 second” setting, if a control is not pushed within 30 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.

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SHORT CUTS FUNCTION FROM THE BUTTONS

	[1]	Main Menu
	[2]	Auto Image Adjust
	[▼] or [▲]	To immediately activate Contrast menu. It should be
		change to Brightness OSD by push button [2]
	[▼] + [▲]	Recall Contrast or Brightness while in the Contrast or
		Brightness adjustment, or recall both of Contrast and
		Brightness when the OSD is not open.
	[1] + [2]	Toggle 720x400 and 640x400 mode when input 720x400
		or 640x400 mode
	[1] + [▼] + [▲]	White Balance (Not shown on user’s guide)
		• Power Lock: Press and hold “[2], & ▼” for 10 seconds.
		If the power button is pressed the message Power
	[1] + [▼]	Button Locked will display for 5 seconds. With or without
		this setting, after a power failure, your LCD display’s
		power will automatically turn ON when power is restored.
		• Power Unlock: Press and hold “[2], & ▼” again for 10
		seconds.
		• OSD Lock: Press and hold "[1], & (▲)" for 10 seconds.
	[1] + [▲]	If any buttons are pressed the message OSD Locked will
		display for 5 seconds.
		• OSD Unlock: Press and hold “[1], & ▲” again for 10
		seconds.
	[; ]	Volume mute on/off

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.

The Power Board will provide AC to DC Inverter voltage to drive the backlight of panel and the Main Board chips each voltage.

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

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4.2POWER BLOCK FUNCTION DESCRIPTION

Inverter Block Function

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Power Block Function

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4.4 INTRODUCTION OF IC

RTD2523B-LF(U401): integrate ADC, OSD, TMPS, RSDS TX, LVDS TX, convert analog RGB into digital and room and shrink scaling output to LCD panel.

PIN Function:

Pin	Symbol	Description
127	XO	Crystal OSC output
128	XI	Reference clock input from external crystal or from
		single-ended CMOS/TTL OSC 3.3V tolerance
50	DDCSCL1 ADC	Open drain Internal 75K pull high
51	DDCSDA1 ADC	Open drain Internal 75K pull high
121	DDCSCL2 DVI	Open drain Internal 75K pull high
120	DDCSDA2 DVI	Open drain Internal 75K pull high
123	RESET_OUT	Reset out Open drain( internal 75KOhm high)
110/48	COUT	Crystal out
124	33VRST_REF	Reference 3.3V for Reset Out
109	33VPNLOUT	Panel on/off switch out Max current driving 1A
58	BJT_B	Embedded regulator P type BJT control pin out
5	TMDS_TST	TMDS_TEST Pin;
		Power-on-latch for host interface type.
7/13	TMDS_VDD	TMDS power 3.3V
6	REXT	Impedance Match Reference.
49/112	PWM2
4/48/111	PWM1
3/5/122	PWM0
4	BYPASS	For External Bypass Capacitor
125	DPLL_VDD	Power for digital PLL 3.3V
2	APLL_VDD	Power for multi-phase PLL 3.3V
3	PLL_TEST1	Test Pin 1;Power-on-latch for MCU crystal location
4	PLL_TEST2	Test Pin 2;Power-on-latch for crystal in frequency
56/118	SCSB	Serial control I/F chip select Open drain
57/119	SCLK	Serial control I/F clock Open drain
59/83/108	Pad 3.3V Power	PVCC
47/116	Digital 1.8V Power	VCCK
21/38	ADC_VDD	ADC Power 1.8V
40	VCLK	Video8 Clock
19	AVSO	ADC vertical sync input
		5V tolerance
		Power from PIN 13
20	AHSO	ADC horizontal sync input
		Adjustable Schmidt trigger 5V tolerance
		Power from PIN 13

AIC1084-33PM (U701): DC power convert, used to 5v convert 3.3v.

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MTV512GMV64 (U402): The MTV512M micro-controller is an 8051 CPU core embedded device especially tailored for flat panel display applications. It includes an 8051 CPU core, 768-byte SRAM, 4 channels of 6-bit ADC, 3 external counters/timers, 6 channels of PWM DAC, VESA DDC interface, and a 64K-byte internal program Flash-ROM memory.

Circuit Diagram

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PIN Function

	Name	Pin No.		DESCRIPTION
		PLCC	QFP
	NC	1	39	No connection
	DA0/P5.0	2	40	PWM DAC output/General purpose I/O (open drain)
	DA1/P5.1	3	41	PWM DAC output/General purpose I/O (open drain)
	DA2/P5.2	4	42	PWM DAC output/General purpose I/O (open drain)
	DA3/P5.3	5	43	PWM DAC output/General purpose I/O (open drain)
	DA4/P5.4	6	44	PWM DAC output/General purpose I/O (open drain)
	DA5/P5.5	7	1	PWM DAC output/General purpose I/O (open drain)
	P5.6/HSCL2	8	2	General purpose I/O/Slave llC1 SCL2 open drain
	P5.7/HSDA2	9	3	General purpose Output/Slave llC1 SCL2 open drain
	RST	10	4	High Active RESET
	HSCL1/P3.0/RXD	11	5	Slave IIC clock/General purpose I/O/Rxd (open drain)
	HSDA1/P3.1/RXD	13	7	Slave IIC clock/General purpose I/O/Txd (open drain)
	P3.2/INT0	14	8	General purpose I/O/External interrupt 0(Standard 8051)
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P3.3/INT1	15	9	General purpose I/O/External interrupt 1(Standard 8051)
P3.4/T0	16	10	General purpose I/O/T0 Ext. Counter/Timer 0(Standard8051)
P3.5/T1	17	11	General purpose I/O/T1 Ext. Counter/Timer 1(Standard8051)
P7.6/CLKO2	18	12	General purpose I/O/Clock out 2 (CMOS)
P7.7	19	13	General purpose I/O (CMOS)
X2	20	14	Crystal Out
X1	21	15	Crystal In
VSS	22	16	Ground
P6.0/AD0	24	18	General purpose I/O(COMS)/6-bit ADC channel 0 input
P6.1/AD1	25	19	General purpose I/O(COMS)/6-bit ADC channel 1 input
P6.2/AD2	26	20	General purpose I/O(COMS)/6-bit ADC channel 2 input
P6.3/AD3	27	21	General purpose I/O(COMS)/6-bit ADC channel 3 input
P6.4	28	22	General purpose I/O(COMS)
P6.5	29	23	General purpose I/O(COMS)
P6.6/CLKO1	30	24	General purpose I/OCLKO1(COMS)
P6.7	31	25	General purpose I/O(COMS)
VSYNC	32	26	VSYNC input
P1.7	36	30	General purpose I/O(Standard 8051/CMOS)
P1.6	37	31	General purpose I/O(Standard 8051/CMOS)
P1.5	38	32	General purpose I/O(Standard 8051/CMOS)
P1.4	39	33	General purpose I/O(Standard 8051/CMOS)
P1.3	40	34	General purpose I/O(Standard 8051/CMOS)
P1.2	41	35	General purpose I/O(Standard 8051/CMOS)
P1.1	42	36	General purpose I/O(Standard 8051/CMOS)
P1.0/ET2	43	37	General purpose I/O/External Counter/Timer2(Standard
			8051/CMOS)
VCC	44	38	3.3V power

TDA7496L (U201): The UTC TDA7496L is a stereo 2W+2W class AB power amplifier, specially designed for high quality sound, TV and Monitor applications. Features of the UTC TDA7496L include linear volume control, Stand-by and mute functions.

Pin Function

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Circuit Diagram

LD7552BS (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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FAN7547A(IC201): The FAN7547A provides all control functions for a current fed push-pull self oscillation type converter, and also contains voltage. Typical operating frequency range is between 30kHz depending on the CCFL(Cold Cathode Fluorescent Lamp) and the transformer’s characteristics:

NO.	Name	Function Description		NO.	Name	Function Description
1	GNDT	Ground		8	FB	Feedback Input
2	Vds	Dimming Voltage Input		9	COMP	Error Amplifier Output
3	Vref	Reference Voltage		10	S/S	Soft Start
4	Vms	Dimming Mode Selection		11	OSC	Main Ct
5	Rct	Burst Dimming Frequency		12	Vcc	Supply Voltage
		Set
6	OLP	Open Lamp Protection		13	Vcc1	Output Drive Source Voltage
7	SDP	Shutdown Protection		14	OUT	Output Drive
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5. Adjust 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 Chroma-7120 MEM .Channel setting

A Reference to Chroma 7120 user guide

B Use “ SC” key and “ NEXT” key to modify xyY value and use “ID” key to modify the TEXT description Following is the procedure to do white-balance adjust

2.)Setting the color temp. You want

A MEM.CHANNEL9 ( 9300 color):

9300 color temp. parameter is Wx = 0.283 ±0.02;Wy = 0.298 ±0.02;

Y > 190 cd/m2 , B MEM.CHANNEL10 ( 6500 color):

6500 color temp. parameter is Wx = 0.313±0.02;Wy = 0.329 ±0.02;

Y > 260 cd/m2, C MEM.CHANNEL 11 ( 5400 color):

5400 color temp. parameter is Wx = 0.335±0.02;Wy = 0.350 ±0.02;

Y > 210 cd/m2, D MEM.CHANNEL 12 ( 5000 color):

5000 color temp. parameter is Wx = 0.346±0.02;Wy = 0.359 ±0.02;

Y > 210 cd/m2 E MEM.CHANNEL13 ( SRGB color):

SRGB color temp. parameter is Wx = 0.313±0.02;Wy = 0.329 ±0.02; Y > 220 cd/m2,

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3.)Into factory mode of VA712b-2

A First Power off, then press Switch 2 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.

4.)Bias adjustment :

Set the Contrast to 70

Adjust the Brightness to 100.

5.)Gain adjustment :

Move cursor to “-F-” and press MENU key

A Adjust 9300 color-temperature

(1) Switch the Chroma-7120 to RGB-Mode (with press “MODE” button )

(2) Switch the MEM. channel to Channel 9 ( with up or down arrow on Chroma 7120 )

(3) The LCD-indicator on Chroma 7120 will show x = 0.283 ±0.02, y =0.298 ±0.02,

Y > 250 cd/m2

(4) Adjust the RED of color1 on factory window until chroma 7120 indicator reached the value R=100

(5) Adjust the GREEN of color1 on factory window until Chroma 7120 indicator reached the value G=100

(6) Adjust the BLUE of color1 on factory window until Chroma 7120 indicator reached the value B=100

(7) Repeat above procedure ( item 4,5,6) until Chroma 7120 RGB value meet the tolerance =100±5

B Adjust 6500 color-temperature

(1) Switch the chroma-7120 to RGB-Mode (with press “MODE” button )

(2) Switch the MEM .channel to Channel 10( with up or down arrow on Chroma 7120 )

(3) The LCD-indicator on Chroma 7120 will show x = 0.313 ±0.02, y = 0.329 ±0.02,

Y>260 cd/m2

(4) Adjust the RED of color3 on factory window until Chroma 7120 indicator reached the value R=100

(5) Adjust the GREEN of color3 on factory window until Chroma 7120 indicator reached

the value G=100

(6) Adjust the BLUE of color3 on factory window until Chroma 7120 indicator reached

the value B=100

(7) Repeat above procedure ( item 4,5,6) until Chroma 7120 RGB value meet the tolerance =100±5

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