ViewSonic Q19wb-3, VS11578 Service Manual

ViewSonic Q19wb-3

Model No. VS11578

19” Color TFT LCD Display

(Q19wb-3_SM Rev. 1a Oct. 2006)

ViewSonic 381 Brea Canyon Road, Walnut, California 91789 USA - (800) 888-8583

Service Manual

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Copyright © 2006 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 10/31/2006 Initial Release Jamie Chang

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TABLE OF CONTENTS

1. Precautions and Safety Notices 1

2. Specification 4

3. Front Panel Function Control Description 10

4. Circuit Description 12

5. Adjustment Procedure 20

6. Troubleshooting Flow Chart 42

7. Recommended Spare Parts List 46

8. Exploded Diagram and Exploded Parts List 48

9. Block Diagram 52

10. Schematic Diagrams 53

11. PCB Layout Diagrams 61

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1. Precautions and Safety Notices

1. Precaution & Safety Notice

1. Caution :

No modification of any circuit should be attempted . Service work should only be performed after you are thoroughly familiar with all of the following safety checks and servicing guide line

2. Safety Check :

Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit. These voltage are exposed in such areas as the associated transformer circuits .

3. POWER SUPPLY REQUIREMENTS The external power converter for this display utilizes AC and DC cords , AC cord is detachable , but DC cord is

permanently attached . Any attempt to replace another adapter could result in serious problem on the display .

4. LEAKAGE CURRENT HOT CHECK 4-1 Plug the AC cord directly into the AC outlet. Do not use an isolation transformer during this check. 4-2 Connect a 1500 ohm , 10 watt resistor , paralleled by a 0.15uF capacitor between each metallic part and a good earth

ground

4-3 Use an AC voltmeter with 1000 ohm / volt or more sensitivity and measure the AC voltage across the combination

1500 ohm resistor and 0.15uF capacito r. 4-4 Move the resistor connection to each exposed metallic part and measure the voltage. 4-5 Reverse the polarity of the AC plug in the AC outlet and repeat the above measurement. 4-6 Voltage measured must not exceed 1.5 volt RMS, from any exposed metallic part to the ground. A leakage current

tester may be used in the above hot check, in which case any circuit measured must not exceed 1.0 milliamp. In the

case of a measurement exceeding the 1.0 milliamp value, a rework is required to eliminate the chance of a shock

hazard .

To Metal Parts

AC VOLTMETER

1500 10W

0.15u .

Earth Ground

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Q19wb-3 series handling Notice

Correct Method Incorrect method

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Correct Method Incorrect method

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2. Specification

1. GENERAL REQUIREMENTS

General Specification

Test Resolution & Frequency 1440x900 @ 60Hz Test Image Size Full Size

Contrast and Brightness Controls

Factory Default: Contrast = 80%, Brightness = 100%

2. SIGNAL INTERFACE

Video Interface

Input Connector (refer the appendix A) D-Sub = DB-15 (Analog) Default Input Connector D-Sub

Video Cable Strain Relief

Equal to twice the weight of the monitor for five minutes

Video Cable Connector DB-15 Pin out Compliant DDC1/2B

Video RGB (Analog)

Video Signals

Separate Sync / SOG / Composite Video Impedance 75 Ohms (Analog) Maximum PC Video Signal 950 mV with no damage to monitor Maximum Mac Video Signal 1250 mV with no damage to monitor Sync Signals TTL DDC/CI N/A Sync Compatibility Separate Sync / Composite Sync / SOG

Video Compatibility

Shall be compatible with all PC type

computers, Macintosh computers, and after

market video cards

Resolution Compatibility

640 x 350, 640 x 400, 640 x 480, 720 x 400,

800 x 600, 832 x 624, 1024 x 768,

1152 x 864, 1152 x 870,1280 x 1024,

1440 x 900, Exclusions Not compatible with interlaced video

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3. Power

Internal Power Supply Delta EADP-45AF BF Input Volt age Range 90 to 264 VAC Input Frequency Range 47.5 to 63 Hertz Short Circuit Protection Output can be shorted without damage Over Current Protection 5.0 A typical at 12.0 VDC Leakage Current 0.75mA (Max) at 264VAC / 50Hz Efficiency 75 % (min.) Fuse Internal and not user replaceable Power Dissipation 45 Watts (typ) Max Input AC Current 1.2 Arms @ 90VAC, 0.7 Arms @264VAC

Inrush Current (Cold Start)

60 A (max) @ 115VAC 90A(Max)264VAC

Power Supply Cold Start

Shall start and function properly when under full load, with all combinations of input voltage, input frequency, and operating temperature.

Power Supply Transient Immunity

Shall be able to withstand an ANSI/IEEE C62.41-1980 6000V 200 ampere ring wave transient test with no damage.

Power Supply Line Surge Immunity

Shall be able to withstand 1.5 times nominal line voltage for one cycle with no damage.

Power Supply Missing Cycle Immunity

Shall be able to function properly,without reset or visible screen artifacts, when ½ cycle of AC power is randomly missing at nominal input.

Power Supply Acoustics

The power supply shall not produce audible noise that would be detectable by the user. Audible shall defined to be in compliance with ISO 7779 (DIN EN27779:1991) Noise measurements of machines acoustics. Power Switch noise shall not be considered.

Power Saving Operation(Method) VESA DPMS Signaling

On Mode < 40 W (Typ ) / 36 W (max)

Power Consumption

Active Off < 1 W

Recovery Time On Mode = N/A, Active Off < 5 sec

4. ELECTRICAL REQUIREMENTS

Horizontal /Vertical Frequency Horizontal Frequency

31 – 81 kHz

Vertical Refresh Rate

50 – 75 Hz.

Maximum Pixel Clock 140 MHz Sync Polarity Independent of sync polarity.

Timing Table

Analog Item Timing

Separated

Composite

SOG

Digital - TMDS

Remark

1 640 x 350 @ 70 Hz, 31.5 KHz 　　　

2 640 x 400 @ 70 Hz, 31.5 KHz 　　　

For Separated Sync, Switch 640x400@70Hz and 720x400@70Hz by [AUTO]+[MENU] short cut key (primary = 720x400@70Hz)

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3 640 x 480 @ 60 Hz, 31.5 KHz 　　　 4 640 x 480 @ 67 Hz, 35 KHz 　　　 5 640 x 480 @ 72 Hz, 37.9 KHz 　　　 6 640 x 480 @ 75 Hz, 37.5 KHz 　　　 7 720 x 400 @ 70 Hz, 31.5 KHz 　　　 8 800 x 600 @ 56 Hz, 35.1 KHz 　　　 9 800 x 600 @ 60 Hz, 37.9 KHz 　　　 10 800 x 600 @ 72 Hz, 48.1 KHz 　　　 1 1 800 x 600 @ 75 Hz, 49.6 KHz 　　　 12 832 x 624 @ 75 Hz, 49.7 KHz 　　　 13 1024 x 768 @ 60 Hz, 48.4 KHz 　　　 14 1024 x 768 @ 70 Hz, 56.5 KHz 　　　 15 1024 x 768 @ 72 Hz, 58.1 KHz 　　　 16 1024 x 768 @ 75 Hz, 60 KHz 　　　 17 1152 x 864 @ 75 Hz, 67.5 KHz 　　　 18 1152 x 870 @ 75 Hz, 68.7 KHz 　　　 19 1280 x 1024 @ 60 Hz, 64 KHz 　　　 20 1280 x 1024 @ 75 Hz, 80 KHz 　　　 21 1280 x 960 @ 60 Hz 59.7 KHz 　 22 1440 x 900 @ 60 Hz, 55.9 KHz 　　　 23 1440 x 900 @ 75 Hz, 70 KHz 　　　

Changing Modes

● Maximum Mode Change Blank Time for image stability : 3 seconds (Max), excluding “Auto Adjust” time

● Under DOS mode (640 x 350, 720 x 400 & 640 x 400), it should recall factory setting when execute “Auto

Adjust”

● The monitor needs to do “Auto Adjust” the first time a new mode is detected (see section “0-Touch™ Function Actions”)

● While running Change Mode, Auto Adjust or Memory Recall, the image shall blank

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5. LCD Panel

1st Source Panel

Model number Hannstar HSD190MGW1-A00 Type Active Matrix TFT Active Size 19.1"w Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.2835mm x 0.2835mm Glass Treatment Anti-Glare # of Backlights 4 CCFL Backlight Life 50000 Hrs (Min)@6.5mA

300 cd/m2 (Typ after 30 minute warm up) Luminance (Center) –

CT = 6500K, Contrast/ Brightness = Max

240 cd/m2 (Min after 30 minute warm up)

Brightness Uniformity 75% (min) Contrast Ratio 700 :1 (Typ) 450 : 1 (Min) Color Depth 16.2 million colors (6-bit+FRC panel) Horizontal Viewing Angle 150 degrees (Typ) @ CR>10 130 degrees (Min) @ CR>10 Vertical Viewing Angle 140 degrees (Typ) @ CR>10 120 degrees (Min) @ CR>10 Response Time

On/Off

10%-90% @ Ta=25°C Typical = 5 ms (Tr = 1.5 ms; Tf = 3.5 ms) Maximun = 10 ms (Tr = 3ms; Tf = 7ms) Mercury 3.5 mg per lamp Panel Defects Please see Panel Quality Specifications.

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2nd Source Panel

Model number Hannstar HSD190MGW1-A02 Type Active Matrix TFT Active Size 19.1"w Pixel Arrangement RGB Vertical Stripe Pixel Pitch 0.2835mm x 0.2835mm Glass Treatment Anti-Glare # of Backlights 4 CCFL Backlight Life 50000 Hrs (Min)@6.5mA

300 cd/m2 (Typ after 30 minute warm up) Luminance (Center) –

CT = 6500K, Contrast/ Brightness = Max

240 cd/m2 (Min after 30 minute warm up)

On/Off

10%-90% @ Ta=25°C Typical = 5 ms (Tr = 1.5 ms; Tf = 3.5 ms) Maximun = 10 ms (Tr = 3ms; Tf = 7ms) Mercury 3.5 mg per lamp Panel Defects Please see Panel Quality Specifications.

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6. MECHANICAL.

Dimension (Desktop)

Width 446mm (17.6") Height (Height adjust to the bottom) 364mm (14.3") Depth 213.6mm (8.4") Monitor Weight 4.4Kg (9.7 lbs) *Refer to Figure 1

Dimension (Head Only / Wall Mount)

Width 446mm (17.6") Height 292mm (11.5") Depth 66.6mm (2.6") Monitor Weight 4.0 Kg (8.8 lbs) *Refer to Figure 1

Ergonomics

Tilt Up ≧ 20º Tilt Down From 0º down to -3º ~ -5º

7. ENVIRONMENTAL

z Operating Temperature : 0°C to +40°C z Storage Temperature : -20°C to +60°C z Operating Relative Humidity : 20% to 90% RH Non-Condensing z Storage Relative Humidity : 5% to 90% RH Non-Condensing z Operating Altitude : 0 to +3,000 meters z Storage Altitude : 0 to +12,000 meters

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3. Front Panel Function Control Description

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Main Menu Controls

Adjust the menu items shown below by using the left and right buttons.

A. Brightness adjusts the lamps current to control the screen brightness. B. Contrast adjusts the difference between the image background (black level) and the foreground (white level). C. Image adjust controls are explained below:

Auto Adjustment automatically sizes, centers, clock ,phase and fine tunes the video signal to eliminate waviness and distortion. Press the [menu] button to obtain a sharper image. H./V. Position adjusts horizontal and vertical position of the screen image. You can toggle between Horizontal and Vertical by pressing button [menu]. Horizontal moves the screen image to the left or to the right. Vertical moves the screen image up and down. Clock adjust Sets up the internal clock. Larger values make the displayed image appear wider; smaller values make it appear compressed.

Phase adjust Adjusts the internal clock’s time lag in order to optimize the screen image. Sharpness adjust

the clarity and focus of the screen image.

D. Color Adjust

provides several color options: preset color temperatures and Custom User Color which allows you to adjust

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). 5400K — Adds red to the screen image for warmer white and richer red. Custom User Color — Individual adjustments for red, green, and blue. 1 To select color (R, G or B) press button [menu]. 2 To adjust selected color, press [<] or [>]

3 When you are finished making all color adjustments, press button [Auto] twice.

E. OSD CONTROL controls are explained below:

H/V.OSD Position allows you to move the on-screen display menus and control screens.

OSD Timeout sets the length of time an on-screen display screen is displayed. For example, with a“15 second” setting,

if a control is not pushed within 15 seconds, the display OSD disappears.

F. Other Adjust

controls are explained below:

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

Speaker volume allows you to increase or decrease the volume

Information there is an optional OSD window that displays the newly adjusted screen resolution settings.

G. Reset returns adjustments to the o riginal factory settings if the display is op erating in a factory Preset Timing Mode listed

in this user guide.

H. Exit allows you exit the OSD menu, press button [Menu].

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4. Circuit Description

1. Outline

1.1 Auto button, left arrow button, right arrow button, Menu button, Power button on the front panel.

1.2 D-sub 15pin connector, audio line-in receptacle, and AC-IN are located on the back side of the cabinet.

1.3 OSD menu includes the following function; (1)Brightness& Contrast adjusts

(2) Image Adjust (3) Color Adjust (4) OSD Control (5) Other Adjust (6) Reset (7) Exit

1.4 Speaker Volume & the control bar is adjustable by [<], [>] button. Mute or Speaker [MENU] key when speaker

volume OSD appear

Audio volume can be controlled with right arrow button when Audio Adjust menu is acti ve.

2. CONNECTORS

2.1 AC inlet : CEE7-7 typed connector

2.2 Audio : Line-in,

AJ1

PHONE JACK 5P (ZD005D100)

Line-in receptacle (Line-in receptacle is green)

2.3 Video signal connector for analog input: 15P Mini D-Sub

CN1

VGA

1 6 2 7 3 8 4 9 5

11 12 13 14 15

1617

PIN MNEMONI SIGNAL

1 RV Red Video

2 GV Green Video

3 BV Blue Video

4 NC None

5 GND Ground(DDC return)

6 RG Red GND

7 GG Green GND

8 BG Blue GND

9 +5V +5V (for DDC)

10 SG Sync GND

11 NC None

12 SDA DDC Data

13 HS Horizontal Sync

14 VS Vertical Sync

15 SCL DDC Clock

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3. ELECTRICAL SPECIFICATIONS

3.1 Standard Testing conditions

Display Area 408.24(H) x 255.15(V) mm Video Signal 0.7Vpp Contrast Default Brightness Default Ambient 25 +/- 5 °C Input AC230V+/-10%@50HZ Warming up > 30 min Display 1400 x 900@60HZ

3.2 POWER

3.2.1 Power supply Input voltage 90~264Vac

Power frequency 47~63Hz

<1.2Arms@90Vac Input current

<0.7 Arms @264Vac Inrush current 90A(Max) @ 264Vac(cold start) Power consumption 40W(MAX)

3.2.2 Power Management

State Power Indicator On <40Watts Green Standby < 1Watts Amber off <1Watts Dark

3.3 Acceptable timing

If the timing is within following specification, this LCD display can automatically function with a certain position.

Horizontal: Sync frequency: 31~81 KHz (Analog: 165MHz) Vertical: Sync frequency: 50~75Hz

3.4 Signal level and input impedance

3.4.1 Video Signal level: 0.7Vp-p Video signal.

3.4.2 Sync Signal level H/V Separate: TTL level

3.4.3 Input impedance

Analog video input: 75 ohm Sync input: > 1 k ohm Audio input: 10K ohm

4. SIGNAL CABLE: Signal cable with Mini D-Sub 15P connectors at both ends. Length: 1.8 meter.

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5. EDID data

5.1. Analog EDID: Analog EDID is stored in U6

HSD panel: VIEWSONIC CORPORATION

EDID Version # 1, Revision # 3 DDCTest For: ViewSonic Q19wb-3 ______________________________________________________________________ EDID Block 0, Bytes 0-127 128 BYTES OF EDID CODE: 0 1 2 3 4 5 6 7 8 9 ________________________________________ 0 | 00 FF FF FF FF FF FF 00 5A 63 10 | 1F 3E 01 01 01 01 01 10 01 03 20 | 08 29 1A 78 2E 9B B6 A4 53 4B 30 | 9D 24 14 4F 54 BF EF 80 95 00 40 | 95 0F 81 80 81 40 71 4F 01 01 50 | 01 01 01 01 9A 29 A0 D0 51 84 60 | 22 30 50 98 36 00 98 FF 10 00 70 | 00 1C 00 00 00 FF 00 51 48 5A 80 | 30 36 30 31 30 30 30 30 31 0A 90 | 00 00 00 FD 00 38 4B 1F 50 0E 100 | 00 0A 20 20 20 20 20 20 00 00 110 | 00 FC 00 51 31 39 77 62 2D 33 120 | 0A 20 20 20 20 20 00 98 ______________________________________________________________________ (08-09) ID Manufacturer Name ________________ = VSC (11-10) Product ID Code _____________________ = 3E1F (12-15) Last 5 Digits of Serial Number ______ = Not Used (16) Week of Manufacture _________________ = 01 (17) Year of Manufacture _________________ = 2006 (10-17) Complete Serial Number ______________ = See Descriptor Block (18) EDID Version Number _________________ = 1 (19) EDID Revision Number ________________ = 3 (20) VIDEO INPUT DEFINITION: Analog Signal

0.700, 0.300 (1.000 Vp-p) Separate Syncs (21) Maximum Horizontal Image Size ________________ = 410 mm (22) Maximum Vertical Image Size __________________ = 260 mm (23) Display Gamma ________________________________ = 2.20 (24) Power Management and Supported Feature(s):

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Active Off/Very Low Power, Standard Default Color Space, Preferred Timing Mode Display Type = R/G/B Color (25-34) CHROMA INFO: Red X - 0.643 Green X - 0.295 Blue X - 0.143 White X - 0.310 Red Y - 0.325 Green Y - 0.616 Blue Y - 0.081 White Y - 0.330 (35) ESTABLISHED TIMING I: 720 X 400 @ 70Hz (IBM,VGA) 640 X 480 @ 60Hz (IBM,VGA) 640 X 480 @ 67Hz (Apple,Mac II) 640 X 480 @ 72Hz (VESA) 640 X 480 @ 75Hz (VESA) 800 X 600 @ 56Hz (VESA) 800 X 600 @ 60Hz (VESA) (36) ESTABLISHED TIMING II: 800 X 600 @ 72Hz (VESA) 800 X 600 @ 75Hz (VESA) 832 X 624 @ 75Hz (Apple,Mac II) 1024 X 768 @ 60Hz (VESA) 1024 X 768 @ 70Hz (VESA) 1024 X 768 @ 75Hz (VESA) 1280 X 1024 @ 75Hz (VESA) (37) Manufacturer's Reserved Timing: 1152 X 870 @ 75Hz (Apple,Mac II) (38-53) Standard Timing Identification: 1440 X 900 @60Hz 1440 X 900 @75Hz 1280 X 1024 @60Hz 1280 X 960 @60Hz 1152 X 864 @75Hz Not Used Not Used Not Used ______________________________________________________________________ (54-71) Detailed Timing / Descriptor Block 1: 1440x900 Pixel Clock: 106.50 MHz ______________________________________________________________________ Horizontal Image Size: 408 mm Vertical Image Size: 255 mm Refreshed Mode: Non-Interlaced Normal Display - No Stereo

Horizontal: Active Time: 1440 pixels Blanking Time: 464 pixels

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Sync Offset: 80 pixels Sync Pulse Width: 152 pixels Border: 0 pixels Frequency: 55.93 KHz

Vertical: Active Time: 900 lines Blanking Time: 34 lines Sync Offset: 3 lines Sync Pulse Width: 6 lines Border: 0 lines Frequency: 59.89 Hz

Digital Separate, Horizontal Polarity (-) Vertical Polarity (+)

______________________________________________________________________ (72-89) Detailed Timing / Descriptor Block 2:

Monitor Serial Number: QHZ060100001 ______________________________________________________________________ (90-107) Detailed Timing / Descriptor Block 3:

Monitor Range Limits: Min Vertical Freq - 56 Hz Max Vertical Freq - 75 Hz Min Horiz. Freq - 31 KHz Max Horiz. Freq - 80 KHz Pixel Clock - 140 MHz Secondary GTF - Not Supported ______________________________________________________________________ (108-125) Detailed Timing / Descriptor Block 4:

Monitor Name: Q19wb-3 (126) No Extension EDID Block(s) (127) CheckSum OK

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6. THEORY OF OPERATION

This section describes the function of the LCD monitor per functional block.19” monitor includes MB board (including audio board function inside), inverter board, (including adapter function inside) and button board.

6.1 MB BOARD

The MB board is a two-layer, sin gle-landed design with ground and ground planes provided. The VGA cable is a sig nal cable that contains video signal, sync signal and DDC signal from PC VGA adapter This system board consists of 3 functional areas : flat panel controller, Micro controller and audio controller.

6.1.1 Flat panel controller…… TSUM16AK-LF-1 (U4)

The heart of the system board is Mstar TSUM16AK-L F-1. The TSUM16AK-LF-1 is a graphics processing IC for LCD monitor. It provides all key IC cont rol functions required for LCD panel. On-chip functions include a high-speed triple-ADC , PLL, high sacling engine Micro processor and OSD controller ,manages other devices in the system such as the keypad, the backlight, LED and audio general purpose input/output pins.

a) Clock Generation :

Crystal Input Clock (XTALI and XTAL). This is the input pair to an internal crystal oscillator andco rresponding

logic. A 14.318 MHz crystal is recommended.

b) Hardware Reset ( Pin 19 )

Hardware Reset signal is generated by TSUM16AK-LF-1 (U4/Pin 19).It assert a reset signal at least 1 ms.

Pin number Pin name Pin function

23 GPIO_P00/SAR1 Key-Menu

24 GPIO_P01/SAR2 Key-Sel/Auto

25 GPIO_P02/SAR3 Key-Power on/off

26 GPIO_P03 Key-Right

27 GPIO_P06 Key-Left

28 GPIO_P07 Key-Down(NC)

29 PWM0/GPIO_P26 Key-Up(NC)

30 GPIO_P13 LED-Green

31 GPIO_P14 LED-Orange

35 GPIO_P16/PWM2 Audio-MUTE(NC)

69 GPIO_P15/PWM0 Audio-Stby-Power

78 PWM2/GPIO_P24 Audio-Volume

21 PWM1/GPIO_P25 Backlight-adi

36 DDCD_SDA SDA-VGA (Debug)

37 DDCD_SCL SCL-VGA (Debug)

65 DDCA_SDA/RS232_TX SDA(Debug)

66 DDCA_SCL/RS232_RX SDA(Debug)

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c) Analog to Digital Converter

The TSUM16AK-LF-1 chip has three ADC's (analog-to-digital converters), one for each color (red, green and blue) . The analog RGB signals are connected to TSUM16AK-LF-1 as described below

Pin Name Pin Number Red + 59 Red - 58 Green + 56 Green - 55 Blue + 54 Blue - 53

d) OSD :

The TSUM16AK-LF-1 has a fully programmable, high-quality OSD controller. The on-chip static RAM(256 different fonts at size of 12X18) stores the cell map and the cell definitions.

e) Panel Power Sequencing (VDDCTRL_2, on_BACKLIGHT) ( Pin 74~20)

The TSUM16AK-LF-1 has two dedicated output s VDDCTRL_2 and on_backlight( Pin74 and Pin20) to control LCD power sequencing once data and control signals a re stable.

f) Inverter Brightness control (PWM1) (Pin 21)

The TSUM16AK-LF-1 has one PWM output PWM1 (Pin21) to control Inverter Brightness Range.

g) Panel LVDS interface (Pin105~114, Pin118~127)

The TSUM16AK-LF-1 driver interface is highly programmable. It supports LVDS port for panel.

6.1.2 Audio controller TDA7496L (AU1)

The TDA7496L is a 2 channel audio power amplifier capable of delivering 2W of continuous av erage power to an 8 ohms with less than 3% (THD) from a 12 V power supply. TDA7496L can directly drive 8 ohms speaker , Features of the TDA7496L include linear volume(pin6), Stand-by(pin11) and mute(pin12) functions. Audio line-in are feed into pin 4,9 of the TDA7496L. The output power is controlled by the DC voltage of AQ1.

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ViewSonic Q19wb-3, VS11578 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual