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Diamond View LCD Monitor
DV172 / DV172B (B=Black Cosmetic)
Service Guide
February 2003
Distributed by
Mitsubishi Electric Australia Pty. Ltd.
A.B.N. 58 001 215 792
348 Victoria Road
RYDALMERE NSW 2116
Australia
Telephone 1300 605 808
Copyright
Copyright ã 1996 by the Company. 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 the Company.
Disclaimer
The Company makes no representations or warranties, either expressed or implied, with respect to
the contents hereof and specifically disclaims any warranties, merchantability or fitness for any
particular purpose. Further, the Company reserves the right to reserve this publication and to make
changes from time to time in the contents hereof without obligation of the Company to notify any
person of such revision or changes.
ii
Diamond View LCD Monitor
DV172 / DV172B
(B = Black Cosmetic's)
Manual Contents
Section
1. Engineering Specifications
2. Circuit Operation Theory
3. Alignment procedure
4. Trouble Shooting
5. Parts Lists (DV172 & DV172B)
6. Schematic Diagrams
7. Assembly
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DV172 LCD Monitor Service Guide
Engineering Specification
Table of Contents
1. INTRODUCTION ...................................................................................................................................2
2. ELECTRICAL CHARACTERISTICS .................................................................................................3
2.1 POWER SUPPLY......................................................................................................................................3
2.2 SIGNAL INTERFACE ...............................................................................................................................3
2.3 VIDEO PERFORMANCE ...........................................................................................................................5
2.4 SCAN RANGE .........................................................................................................................................5
2.5 PLUG & PLAY DDC2B SUPPORT ..........................................................................................................5
2.6 SUPPORT TIMINGS .................................................................................................................................5
3. OPERATIONAL & FUNCTIONAL SPECIFICATION .....................................................................6
3.1 VIDEO PERFORMANCE ...........................................................................................................................6
3.2 BRIGHTNESS ADJUSTABLE RANGE ........................................................................................................6
3.3 ACOUSTICAL NOISE ..............................................................................................................................6
3.4 AUDIO PERFORMANCE ..........................................................................................................................7
4. LCD CHARACTERISTICS ...................................................................................................................7
4.1 THE PHYSICAL DEFINITION & TECHNOLOGY SUMMARY OF LCD PANEL ...............................................7
5. USER CONTROLS .................................................................................................................................8
5.1 USER'S HARDWARE CONTROL DEFINITION: ...........................................................................................8
5.2 OSD CONTROL FUNCTION DEFINITION ..................................................................................................8
6. MECHANICAL CHARACTERISTICS ...............................................................................................9
6.1 DIMENSION ...........................................................................................................................................9
6.2 WEIGHT ................................................................................................................................................9
6.3 PLASTIC ................................................................................................................................................9
6.4 CARTON ................................................................................................................................................9
7. CERTIFICATION ...................................................................................................................................9
APPENDIX: PHYSICAL DIMENSION FRONT VIEW AND SIDE VIEW......................................11
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DV172 LCD Monitor Service Guide
Engineering Specification
1. Introduction
This specification describes DV172, a 17.0" dual interface color TFT LCD monitor with speakers
supported. The display supports up to 1280x1024/75Hz resolution & refresh rate and 262144 colors with
dithering. The features summary is as below,
Feature items Specifications Remark
Panel supplier & Panel type of supplier AUO M170EN05 TN with Film type
Actual Size Diagonal display 17.0" Panel display size
Actual Resolution display SXGA(1280x1024) Panel display resolution
+/- 70 degrees Horizontal (typ.)
+/- 70 degrees Vertical (typ.)
+/- 60 degrees Horizontal (min.)
Viewing Angle (at Contrast Ratio ¡Ù 10) +/- 60 degrees Vertical (min.) Panel spec
Analog interface with Scaling supported Yes With 15 pin D-sub connector
DVI interface with Scaling supported Yes With 24 pin DVI connector.
Video interface with Scaling supported No N.A.
Max resolution mode supported 1280 x 1024 at 75Hz
Number of Display Colors supported 262144 (with dithering) Panel driver is 6 bit
Contrast Ratio 250:1 (min.), 500:1 (typ.)
200 cd/m2 (min.), At R,G,B saturated condition
Luminance 260 cd/m2 (typ.) (Default "User" color setting)
AC power input Yes 90-264 Volts, 47-63 Hz.
DC power input(with AC power adapter) No N.A.
DPMS supported Yes < 3 watts
LED indicator for power status showed Yes Green/Amber/Non
OSD for control & information supported Yes
Multi-language supported for OSD Yes 6 languages
6 buttons including 1 monitor
Buttons control supported Yes power on/off control button.
Flywheel control supported No N.A.
Scaling function supported Yes Genesis gm5120
Auto adjustment function supported Yes "Auto" key function
DDC function supported(EDID ver. 1.3) Yes DDC2B only
Audio speakers supported Yes
Audio Jack(input connector) supported Yes
Earphone Jack(input connector) supported No N.A.
Microphone function supported No N.A.
Mechanical Tilt base design Yes From 0 to +20 degree
VESA wall mounting design Yes
Mechanical Rotate design No N.A.
Mechanical Lift base design No N.A.
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DV172 LCD Monitor Service Guide
Engineering Specification
2. Electrical Characteristics
2.1 Power supply
Item Condition Spec OK N.A Remark
Input Voltage range Universal input full range 90~264VAC /47~63Hz
Input Current range 90 ~ 264VAC < 2.0 Arms
Power Consumption Normal "On" operation < 50 Watts LED: Green
DPMS DPMS "Off" state < 3 Watts LED: Amber
Inrush Current 110 VAC < 30 A (peak) Cold-start
220 VAC < 60 A (peak)
Earth Leakage Current 264 VAC/50Hz < 3.5 mA
Hi-Pot 1. 1500VAC, 1 sec Without damage (on-line test)
2. Ground test: 30A, 1sec < 0.1 ohm (in-lab test)
Power Line Transient IEC1000-4-4 1KV
IEC1000-4-5 (Surge) Common: 2KV,
Differential: 1KV
CCFL operation range 90 ~ 264VAC 6mA ~ 15mA Each connector
CCFL Frequency 90 ~ 264VAC 40KHz ~ 80KHz
Power cord Color: White or Black Depends on shipping
Length: 1800 +/- 20 mm requirement (99 level)
2.2 Signal interface
Item Condition Spec OK N.A Remark
Signal Cable 15 pin D-Sub Color: White or Black Depends on shipping
Length: 1600 +/- 20 mm requirement (99 level)
Pin assignment 15 pin D-sub connector See Note-1 For 15 pin D-sub
24 pin DVI connector See Note-2 For 24 pin DVI
Video input Signal type-1 Separate analog R,G,B signals For 15 pin D-sub
Level(R,G,B signals) 700 mV (peak to peak)
Impedance(R,G,B signals) 75 Ohms +/- 1.5 Ohms
Signal type-2 TMDS signals For 24 pin DVI
Single-ended input swing 200mVV-swing780mV
voltage (V-swing)
Impedance(TMDS signals) 100 Ohms +/- 10 Ohms
Sync input Signal type Separate H/V-sync For 15 pin D-sub
Composite H/V-sync
(Positive/Negative)
Level Logic High: 2.4V ~ 5.5V Refer to VESA VSIS
Logic Low: 0V ~ 0.5V Standard V1R1
(TTL level)
Impedance Minimum 2.2K£(pull down)
[ 10K£[ for application
Sync Pulse Width (SPW) 0.7£g s < H-SPW
1H < V-SPW
Note-1: The pin assignment of 15 pin D-sub connector:
5 1
10 6
15 11
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DV172 LCD Monitor Service Guide
Engineering Specification
Pin Signal Assignment Pin Signal Assignment
1 Red video 9 PC5V (+5 volt power)
2 Green video 10 Sync Ground
3 Blue video 11 Ground
4 Ground 12 SDA
5 Ground 13 H-Sync (or H+V)
6 Red Ground 14 V-sync
7 Green Ground 15 SCL
8 Blue Ground
Note-2: The pin assignment of 24 pins DVI connector: (C1 ~ C5 are NC)
1 2 3 4 5 6 7 8
C1 C2
9 10 11 12 13 14 15 16 C5
C3 C4
17 18 19 20 21 22 23 24
Pin Signal Assignment Pin Signal Assignment
1 TMDS RX2- 16 Hot Plug Detect
2 TMDS RX2+ 17 TMDS RX0-
3 TMDS Ground 18 TMDS RX0+
4 Floating 19 TMDS Ground
5 Floating 20 Floating
6 DDC Clock 21 Floating
7 DDC Data 22 TMDS Ground
8 Floating 23 TMDS Clock+
9 TMDS RX1- 24 TMDS Clock-
10 TMDS RX1+ C1 Floating (NC)
11 TMDS Ground C2 Floating (NC)
12 Floating C3 Floating (NC)
13 Floating C4 Floating (NC)
14 +5V Power C5 Floating (NC)
15 Ground
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DV172 LCD Monitor Service Guide
Engineering Specification
2.3 Video performance
Item Condition Spec OK N.A Remark
Max. support Pixel rate 135 MHz
Max. Resolution 1280 x 1024
Rise time + Fall time < 3.7 ns 1280x1024 @ 75Hz
(50% of minimum pixel (max. support timing)
clock period)
Settling Time after < 5% final full-scale value Refer to VESA VSIS
overshoot /undershoot Standard V1R1
Overshoot/Undershoot < 12% of step function Refer to VESA VSIS
voltage level over the full Standard V1R1
voltage range
2.4 Scan range
Item Condition Spec OK N.A Remark
Horizontal 31 ~ 81KHz
Vertical 56 ~ 75 Hz Without Frame buffer
2.5 Plug & Play DDC2B Support
Item Condition Spec OK N.A Remark
DDC channel type DDC2B
EDID Version 1.3 Refer to FP767-MEA
DV172 C212 S/W spec
document to see the
detailed EDID data
definition..
2.6 Support Timings
Input Timing Actual Output
Horizontal Vertical Dot Clock Actual display OK N.A Remark
Resolution
Frequency (KHz) Frequency (Hz) Frequency (MHz) Resolution
640x350 31.47(P) 70.08(N) 25.17 1280x943 DOS
720x400 31.47(N) 70.08(P) 28.32 1280x1024 DOS
640x480 31.47(N) 60.00(N) 25.18 1280x1024 DOS
640x480 35.00(N) 67.00(N) 30.24 1280x1024 Macintosh
640x480 37.86(N) 72.80(N) 31.5 1280x1024 VESA
640x480 37.50(N) 75.00(N) 31.5 1280x1024 VESA
800x600 37.88(P) 60.32(P) 40.00 1280x1024 VESA
800x600 48.08(P) 72.19(P) 50.00 1280x1024 VESA
800x600 46.86(P) 75.00(P) 49.50 1280x1024 VESA
832X624 49.72(N) 74.55(N) 57.29 1280x1024 Macintosh
1024x768 48.36(N) 60.00(N) 65.00 1280x1024 VESA
1024x768 56.48(N) 70.10(N) 75.00 1280x1024 VESA
1024x768 60.02(P) 75.00(P) 78.75 1280x1024 VESA
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DV172 LCD Monitor Service Guide
Engineering Specification
Input Timing Actual Output
Horizontal Vertical Dot Clock Actual display OK N.A Remark
Resolution
Frequency (KHz) Frequency (Hz) Frequency (MHz) Resolution
1024X768 60.24(N) 74.93(N) 80.00 1280x1024 Macintosh
1152x864 67.50(P) 75.00(P) 108.00 1280x1024 VESA
1152x870 68.68(N) 75.06(N) 100.00 1280x1024 Macintosh
1152x900 61.80(N) 66.00(N) 94.50 1280x1024 SUN 66
1152x900 71.81(N) 76.14(N) 108.00 1280x1024 SUN
1280x1024 64.00(P) 60.00(P) 108.00 1280x1024 VESA
1280x1024 75.83(N) 71.53(N) 128.00 1280x1024 IBM1
1280x1024 80.00(P) 75.00(P) 135.00 1280x1024 VESA
1280x1024 81.18(N) 76.16(N) 135.09 1280x1024 SPARC2
Note-2: "P", "N" stands for "Positive", "Negative" polarity of incoming H-sync/V-sync (input timing)
3. Operational & Functional Specification
3.1 Video performance
Item Condition Spec OK N.A Remark
Resolution Any input resolution modes 1280 x1024
which are under 1280x1024
Contrast ratio 250:1(min.), 500:1 (typ.)
Brightness At R,G,B saturated condition 200 cd/m2(min.)
(Default "User" color setting) 260 cd/m2(typ.)
Response time Rising + Falling time 16 ms(typ.), 25ms(max.)
Viewing angle At Contrast ratio ¡Ù 10 R/L: 60 degrees (min.)
70 degrees (typ.)
At Contrast ratio ¡Ù 10 U/D: 60 degrees (min.)
70 degrees (typ.)
CIE coordinate of White (0.31, 0.33) +/- (0.03, 0.03)
Display colors 262144 color with dithering 18 bits with
dithering
3.2 Brightness Adjustable Range
Item Condition Spec OK N.A Remark
Brightness adjustable range At Max. Contrast level & (Max. brightness value
Full-white color pattern Min. brightness value)
¡Ù 40 cd/¢T
3.3 Acoustical Noise
Item Condition Spec OK N.A Remark
Acoustical Noise At 1 meter distance ¡Ø 40 dB/A
& "Audio" function disabled
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DV172 LCD Monitor Service Guide
Engineering Specification
3.4 Audio performance
Item Condition Spec OK N.A Remark
Preamp + Power amp
(1)Output power 1 Wrms/CH @ 1KHz Real output
(2)THD (@ 1W) <10%
(3)S/N ratio 40dB
Speaker Driver
(1)Nominal impedance 8 ohm
(2)Maximum input power 2W/CH
(3)Frequency response 12KHz
(4)Mean sound pressure level 83 ± 3 dB
(5)Size 28x 40 mm
Audio Control
(1)Volume range 0 ~100 levels
(2)Mute On/Off
4. LCD Characteristics
4.1 The Physical definition & Technology summary of LCD panel
Item Condition Spec OK N.A Remark
LCD Supplier AUO
Panel type of Supplier M170EN05
Screen Diagonal 432mm(17.0")
Display area Unit=mm 337.920(H) x 270.336(V)
Physical Size Unit=mm 358.5(W) x 296.5(H) x 19.0(V)
Weight Unit=gram 1900 (typ.)
Technology TN with Film
Pixel pitch Unit=mm 0.264 x 0.264 Per one triad
Pixel arrangement R,G,B vertical stripe
Display mode Normally white
Support color 262K colors(R,G, B 6-bit data)
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DV172 LCD Monitor Service Guide
Engineering Specification
5. User Controls
5.1 User's hardware control definition:
Item Condition Spec OK N.A Remark
Monitor Power button
Enter button
¡¶ /Inc. button
¡¿ /Dec. button
Exit button
Auto button
Mute button
Input source select button
5.2 OSD control function definition
Item Condition Spec OK N.A Remark
Contrast See Table 3
Brightness
Horizontal Position
Vertical Position
Pixel Clock
Phase
Color Temperature C1: 9300
C2: 6500
C3: 5800
User: Separate R,G,B adjustment
OSD Position OSD Horizontal position
OSD Vertical position
Language 6 languages
OSD Time From 5 sec to 60 sec
Volume
Hot key for Contrast
Hot key for Brightness
Hot key for Volume
Auto adjustment Auto-Geometry/Color
Information For input timing
Mute
Input Source select
Recall
* The detailed Firmware functions' specification, please refer to C212, S/W spec document.
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DV172 LCD Monitor Service Guide
Engineering Specification
6. Mechanical Characteristics
6.1 Dimension
Item Condition Spec OK N.A Remark
Bezel opening 340x272.4 mm Refer to Table 6
Monitor without Stand L x W x H mm 382.7x118x402.85 mm
Monitor with Stand L x W x H mm 382.7x200x404.3 mm
Carton Box (outside) L x W x H mm 495x450x158 mm
Tilt and Swivel range Tilt : 0/20 degree
Swivel:0 degrees
6.2 Weight
Item Condition Spec OK N.A Remark
Monitor (Net) 4.7Kg
Monitor with packing (Gross) 6.5Kg
6.3 Plastic
Item Condition Spec OK N.A Remark
Flammability 94HB
Heat deflection To ABS 65 ¢J
UV stability ABS Delta E < 8.0 MPR2/TCO
Resin MPR2 : ABS
(VW55/VE0856/D350)
Texture MT-11030
Color Pearl White
6.4 Carton
Item Condition Spec OK N.A Remark
Color Kraft
Material B Flute
Compression strength 530 KGF
Burst Strength 16 KGF/cm2
Stacked quantity 13 Layers
7. Certification
Item Condition Spec OK N.A Remark
Environment Green design API Doc. 715-C49 ISO14000
Requirement
Blue Angel German Standard
E-2000 Switzerland
EPA USA Standard
EN61000-3-2 Harmonics
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DV172 LCD Monitor Service Guide
Engineering Specification
TCO92/95
TCO99
PC-Monitor Microsoft Windows PC98/99
DPMS VESA
DDC 2B Version 1.3
USB External
Safety UL (USA) UL 1950 3rd edition
CSA (Canada) C22.2 No. 950-M95
FIMKO EN60950
IEC950
EN60950
73/23/EEC
CB
TUV/GS EN60950
CCIB (China)
EIAJ/JEIDA (Japan)
Item Condition Spec OK N.A Remark
NOM (Mexico)
JEON (Korea)
EZU
PSB
EMC CE Mark 89/336/EEC
FCC (USA) Class B
EN55022 Class B
CISPR 22 Class B
VCCI (Japan) Class B
BSMI (Taiwan)
C-Tick (Australia) AS3548
RRL (Korean)
X- Ray Requirement DHHS (21 CFR) USA X- Ray Standard
DNHW
PTB German X- Ray standard
MPRII
MPRIII
Ergonomics ZH1/618 German ergonomic
ISO 9241-3 -7 & 8
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DV172 LCD Monitor Service Guide
Engineering Specification
Appendix: Physical Dimension Front View and Side view
382. 7
340. 0
78. 5
272. 4
357. 5
250 200
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
I. Introduction:
DV172 model is a 17" SXGA (1280x1024) 18 bits color TFT LCD monitor with multi-media function.
The features of DV172 are as below,
(a)Dual signal input supported for a 15pins D-sub and a DVI-D input connectors.
(b)It's compliant with VESA DPMS spec to offer a smart power management and power saving function.
(c)OSD menu supported for users to control the adjustable items and get some information about this monitor.
(d)"Auto" button function supported to offer users an easy method to set all adjustable & controlled items well
by just pressing one button, "Auto".
(e)VESA DDC2B function supported.
(f)Audio function supported with 2 speakers.
II. Block diagram
DV172 consists of a head and a stand (base). The head consists of a LCD module with 4 lamps, a power
board (include AC-DC, inverter power & audio circuit), a control board and an interface board. The block
diagram is shown as below.
TFT-LCD module with 4 CCFL(backlight)
To
backlight Interface board LVDS xtmr
Power sequence
Inverter circuit Scaler
+
AC-DC board Scaler Power (Genesis
+ Flash
gm5120)
Audio circuit ROM ADC TMDS rcvr
EEPROM
AC Audio DDC D-sub DDC DVI-D
socket IN IC connector IC connector
Speaker Control board Speaker
AC input Analog RGB signals DVI-D(TMDS) signals
III. Circuit operation theory for electrical circuits in HEAD of DV172:
A.) Interface board diagram:
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
Interface Board
RX0
RX1
A/D To
RX2 TMDS LCD
MCU module
RXC
Scaling
Red OSD
Green
Blue
Gm5120
Vsync
Hsync
(H+V)
DDC
SCL
SDA
ROM
FLASH-
EEPROM
DSCL
DDC
DSDA
(a) Circuit operation theory: (The scaling IC used in DV172 is Genesis gm5120)
A basic operation theory for this interface board in Analog input signals processing, the scaling IC
inside A/D converter will convert analog input signals of Red, Green and Blue to 8 bits digital signals of
Red, Green and Blue, and for interface board in DVI-D(TMDS) digital input signals processing, the scaling
IC inside TMDS receiver will convert TMDS signals to 8 bits digital signals of Red, Green and Blue. Then
no matter input signals Analog or DVI-D(TMDS) format are, they have been converted to 8 bits digital Red,
Green and Blue signals, and the scaling IC inside MCU and scaling control circuit will start to do timing
signal detecting and calculating to output the proper LCD panel signals to LCD panel circuit.
The timing signal detecting function in the scaling IC is to detect whether input H-sync, V-sync or
digital pixel clock signals' status have been changed by host PC system, then it will do short-time picture
blanking, signal processing and converting again if input signals have been changed.
The scaling IC inside OSD circuit will be programmed to an OSD menu which can be showed on the
screen to offer adjustable functions to end-users to control and adjust some picture settings by themselves.
After the scaling IC internal signal processing is done, it will output the digital RGB data, the H-sync,
V-sync, pixel clock and DE(data enable) signal to LVDS transmitter and then to LCD panel driver circuit.
There are two kinds of EEPROM used in interface board, one is 24C02 which is used to store DDC
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
data, we also call it, DDC IC, and another is to store OSD common data and those picture controlled and
data.
Flash-Rom is to store the source code which will be accessed by the scaling IC inside MCU to run
program.
(b) IC introduction:
1.) DDC (Display Data Channel) function: We use DDC IC to support DDC/2B function. DDC data is
stored in 24C02(EEPROM). Those data related to LCD monitor specification. PC can read them by
"SDA" and "SCL"("DSDA" & "DSCL" for DVI-D input port) serial communication for I 2C
communication for DDC2B.
2.) Gm5120 IC: There are A/DC, TMDS receiver, Scaling, OSD, MCU in the gm5120 IC. Scaling IC is
revolutionary scaling engine, capable of expanding any source resolution to a highly uniform and sharp
image or down scaling from UXGA, combined with the critically proven integrated 8 bit triple-ADC
and patented Rapid-lock digital clock recovery system. It also support detect mode and DPMS control.
MCU control unit, it controls all the functions of this interface board, just like the OSD display setting,
the adjustable items, adjusted data storage, the external IIC communication, support DDC2B.
3.) EEPROM: All the adjustable data and user settings are stored in EEPROM (24C16).
4.) FLASH ROM: To store source code which will be accessed by Scaling IC inside MCU to run program.
B.) Power board diagram:
EMI Filter Rectifier and Isolation power Rectifier and filter Audio Amp and
filter transformer Pre-Amp
Inverter circuit
Rectifier and filter
PWM controller Switching element
LDO regulator
Feedback Isolation
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
(a) EMI Filter
This circuit (fig. 2) is designed to inhibit electrical and magnetic interference for meeting FCC, VDE,
VCCI standard requirements.
Fig. 2
(b) Rectifier and filter
AC Voltage (90-264V) is rectified and filtered by BD601, C605 (See Fig 3) and the DC Output
voltage is 1.4*(AC input). (See Fig.3)
Fig. 3
(c) Switching element and Isolation power transformer
When the Q601 turns on, energy is stored in the transformer. During Q601 turn-off period, the stored
energy is delivered to the secondary of transformer. R607, C607 and D601 is a snubber circuit. R615 is
current sense resistor to control output power. (See Fig.4)
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
Fig. 4
(d) Rectifier and filter
D701 and C703 are to produce DC output. L701 and C704 are to suppress high Frequency switching
spikes. (See Fig.5)
Fig. 5
(e) PWM Controller
The current mode control IC UC3842B is used to control PWM. When the VCC terminal of it gets
16V, IC601 turns on. +5V will be set up at Pin8 through soft start circuit, which includes R617, C611,
D606 and D605. R616 and C610 generate a fixed frequency saw-tooth wave at Pin4.
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
Fig. 6
(f) Feedback circuit
PC123 is a photo-coupler and TL431 is a shunt regulation. They are used to detect the output voltage
change and be the primary and secondary isolation. When output voltage changes, the feedback voltage
will be compared and duty cycle will be decided to control the correct output voltage. (See Fig.7)
Fig. 7
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
(g) Audio circuit:
Connect with
PC Audio output
DC POWER AUDIO
Connect with INPUT INPUT
8 ohm/2W
Speaker
POWER IC
TDA7496
The Audio circuit is in Power board. The Audio Speaker has DC Volume control, use
28mmX40mm Speaker (2W per channel), power supply from AC-DC board and Audio input from
PC Audio output (Line Out).
1.)Power IC: Use ST POWER IC TDA7496.The IC are stereo Class AB output amplifiers with DC
Volume control. The devices are designed for use in TV and monitor, but are also suitable
for battery-Fed portable recorders and radios. Use +15V from AC-DC Board and connect
speaker to offer 1W per channel.
2.)DC Power Input: To supply +15V to be VCC source Voltage for TDA7496 and built-in AC-DC board.
3.)Audio Input: connect with PC Audio output in 3.5mm to 3.5mm signal line.
4.)Speaker: Use 8 ohm and 28mmX40mm speaker (2W/per channel)
5.)DC Volume Control: The voltage range is 1 5 V (From MC)
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
(h) Inverter circuit:
1.) Block Diagram:
ON/OFF OSCILATOR TRANSFORMER CCFL
15Vin
switching CIRCUIT
ON/OFF PWM CONTROLLER
PROTECTION
TL1451 CIRCUIT
AND DETECT
BRT_ADJ
2.) General Specification
Input Voltage: 15V
Input Current: 2A max.
ON/OFF Voltage: 3.3V
PWM Duty: 3.3V/47KHz
Output Requirement:
Max. Output Current: 15mA
Min. Output Current: 6mA
Lamp Working Voltage: 600Vrms
Open Lamp Voltage: 1800Vrms
Frequency: 55KHz
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
3.)Circuit Operation Theorem
3.1) ON/OFF SWITCH
The turn-on voltage was controlled by R756 and R757.The inverter was turned on or off by the
switching transistors Q761 and Q757, Also regulator IC751 is control by Q761 and Q757 decide
supply 15V to inverter part or instead.
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
3.2) PWM Control circuit
TL1451 is a dual PWM controller.C765 and R765 decide the working frequency.BLT_ADJ
signal is from control board, control pulse width then decide how much energy delivery to CCFL also
decide CCFL brightness. Q741 and Q742 be the buffer to rise the drive capability and the totem poles
circuit can improve a capable of driving for Q743.C770 decide the striking time delay.
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DV172 LCD Monitor Service Guide
Circuit Operation Theory
3.3) Oscillator Circuit
Royer circuit uses the characteristic of transformer saturation to oscillate. When the DC power inject,
Q759 or Q760 will turns on, and the current Ic increases. After a period, the transistor will leave the
saturation status and Vce increase. The result causes the voltage of primary coil get lower. Finally the
transistor turn off, and another transistor turn on. These statuses are repeated and the pin7 and pin8 of
T751 will get a Sin Wave to turn on CCFL.
C.) Control board introduction:
The main parts of the control board are a push button, and a led.
(a) Push button: It's a simple switch function, pressing it for "ON" to do the auto adjustment
function, releasing it for "OFF" to do nothing.
(b) Led: It indicates the DPMS status of this LCD monitor; green light means DPMS on (Normal
operating condition). Amber light means DPMS off (Power off condition).
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DV172 LCD Monitor Service Guide
Alignment procedure
Table of Contents
1. Alignment procedure (for function adjustment)..............................................................................2
A. Preparation: ......................................................................................................................2
B. Timing adjustment: (Analog only, it's no need for DVI-D input source) ........................2
C. Auto color balance adjustment: (Analog only, it's no need for DVI-D input source) .....2
D. Color adjustment: (Analog only)......................................................................................2
E. Writing EDID file: (Analog and DVI-D both) .................................................................3
F. Command definition for Auto Alignment:........................................................................3
2. Wire Dressing..................................................................................................................................4
3. Add Glue .........................................................................................................................................7
4.Touch Up..........................................................................................................................................8
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DV172 LCD Monitor Service Guide
Alignment procedure
1. Alignment procedure (for function adjustment)
The list of necessary alignment for a LCD monitor:
Items Description Remark
1 Timing adjustment Preset timing
2 Auto color balance adjustment SVGA2 60Hz
3 Color temperature adjustment C1, C2 & C3
4 Writing EDID file Analog and Digital
A. Preparation:
1. Setup input timing to any preset modes, any patterns.
2. Enter factory mode (press "EXIT" & "ENTER" at the same time, then press "power" button to turn on monitor).
3. Move blue cursor into "BURN IN MODE" tag and select "YES" to enable burn-in mode.
4. Power off the monitor, then power on again.
5. Setup unit and keep it warm up at least 30 minutes.
B. Timing adjustment: (Analog only, it's no need for DVI-D input source)
1. Enter factory mode (press "EXIT" & "Enter" at the same time, then press "power" button to turn on monitor).
2. Select timing from figure-1. The timing marked with star sign (*) have to be adjusted with Analog signals from
Chroma video pattern generator..
3. Press AUTO key to run "AUTO adjustment" function.
4. Clear user area in EEPROM.
5. Check the phase of the image; if phase is not perfect adjust it to the best condition.
6. Adjust the settings to following values:
CONTRAST = 55
BRIGHTNESS = 90
OSD TIME = 20
VOLUME = 20
COLOR = USER
7. Press "EXIT" key until the "SAVE" shows on the OSD to save factory parameters and turn off the monitor power.
8. Turn on the power enter user mode.
C. Auto color balance adjustment: (Analog only, it's no need for DVI-D input source)
1. Setup input timing SVGA2 (800x600@60Hz), pattern 1(crosshatch pattern with white color frame) with Analog
signals from Chroma video pattern generator.
2. Enter factory mode (press "EXIT" & "Enter" at the same time, then press "power" button to turn on monitor).
3. Move blue cursor into "BURN IN MODE" tag and select "YES" to enable burn-in mode.
4. Set color pointer to USER mode
5. Press " ¡¿ " button to do white balance for auto color balance adjustment.
D. Color adjustment: (Analog only)
1. Setup input timing to any preset modes, pattern 41(full white color pattern) with Analog signals from Chroma video
pattern generator.
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DV172 LCD Monitor Service Guide
Alignment procedure
2. Enter factory mode (press "EXIT" & "ENTER" at the same time, then press "power" button to turn on monitor).
3. Confirm auto color balance adjustment had already been done.
4. Measure each color temperature (C1, C2 & C3) by Minolta CA-110 (or equivalent equipment).
5. Two methods can be used to adjust RED, GREEN, BLUE value of each color temperature, C1, C2 & C3 to meet
following spec requirement, the 1st method is by using external PC and IIC alignment protocol to do automatic
adjustment, and the 2nd method is by manually and must be in factory mode.
Color temperature X+- 0.283+(-) 0.03
(C1, 9300K set on OSD) Y+- 0.297+(-) 0.03
Color temperature X+- 0.313+(-) 0.03
(C2, 6500K set on OSD) Y+- 0.329+(-) 0.03
Color temperature X+- 0.326+(-) 0.03
(C3, 5800K set on OSD) Y+- 0.342+(-) 0.03
6. Turns off the monitor power.
E. Writing EDID file: (Analog and DVI-D both)
1. Setup a PC with DDC card.
2. Connect PC to monitor with a D-sub signal cable.
3. Please refer to the C212 for the correct EDID file.
4. Runs the writing program to write the EDID file into EEPROM for analog input.
5. Read both EEPROM data and confirm if it's matched with the C212 definition.
6. Repeat the above step 1 to step 5 with DVI-D signal cable connected.
F. Command definition for Auto Alignment:
1. PC Host will send 0x7C IIC slave address and then following 4 bytes command
I2C Send Command Byte1 Byte2 Byte3 Byte4
Change Color Temperature to C1 CC 1 XX checksum
Change Color Temperature to C2 CC 2 XX checksum
Change Color Temperature to C3 CC 3 XX checksum
Change C/T to User CC 4 XX checksum
User mode to factory mode 1A 5A XX checksum
Auto Color (Offset1, Offset2, Gain) 1B 5A XX checksum
Factory mode to User mode 1E 5A XX checksum
Clear user area data 1F 5A XX checksum
Off burn in mode CE 2 XX checksum
Change language setting 66 0~5 XX checksum
Note A: Byte4(Checksum) = Byte1 + Byte2 + Byte3
Note B: Data = The value write to MCU
Note C: XX = don't care, any value(<=0xFF).
Note D: The Byte-2 definition of "Change Language Setting" is as below,
0=DE, 1=EN, 2=ES, 3=FR, 4=IT, 5=JA
2. When PC Host sends 0x7D command to MCU, MCU must return as following (2 bytes)
Return Code R-Byte1 R-Byte2
Checksum error code FC AA
Normal return code the above Byte3 (/data) FC
If normal return code is exact FCh FC CF
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DV172 LCD Monitor Service Guide
Alignment procedure
3. The Table is for alignment machine to read data from EEPROM to check if the alignment process and write data are
correct.
I2C Send Command Byte1 Byte2 Byte3 Byte4
Read EEPROM Contrast A3 92 XX checksum
Read EEPROM Brightness A3 93 XX checksum
Read EEPROM C/T Point A3 94 XX checksum
Read EEPROM OSD-Hpos A3 95 XX checksum
Read EEPROM OSD-Vpos A3 96 XX checksum
Read EEPROM Language A3 97 XX checksum
Read EEPROM OSD Timer A3 98 XX checksum
Read EEPROM Volume A3 99 XX Checksum
Figure-1: Preset Timing modes list
Horizontal Vertical Dot Clock Actual display
Resolution Remark
Frequency (KHz) Frequency (Hz) Frequency (MHz) resolution
640x350 31.47(P) 70.08(N) 25.17 DOS 1280x943
720x400 31.47(N) 70.08(P) 28.32 DOS
640x480 31.47(N) 60.00(N) 25.18 DOS
640x480 35.00(N) 67.00(N) 30.24 Macintosh
640x480 37.86(N) 72.80(N) 31.5 VESA
640x480 37.50(N) 75.00(N) 31.5 VESA
800x600 37.88(P) 60.32(P) 40.00 VESA
800x600 48.08(P) 72.19(P) 50.00 VESA
800x600 46.86(P) 75.00(P) 49.50 VESA
832X624 49.72(N) 74.55(N) 57.29 Macintosh
1024x768 48.36(N) 60.00(N) 65.00 VESA
Full screen
1024x768 56.48(N) 70.10(N) 75.00 VESA
1024x768 60.02(P) 75.00(P) 78.75 VESA 1280x1024
1024X768 60.24(N) 74.93(N) 80.00 Macintosh
1152x864 67.50(P) 75.00(P) 108.00 VESA
1152x870 68.68(N) 75.06(N) 100.00 Macintosh
1152x900 61.80(N) 66.00(N) 94.50 SUN 66
1152x900 71.81(N) 76.14(N) 108.00 SUN
1280x1024 64.00(P)