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LM-729 Service Manual Rev: A
SERVICE MANUAL
17" LCD Monitor
LM-729
THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE
EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL; WE CANNOT
GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION
AND DISCLAIMS RE LIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
LM-729 Service Manual Rev: A
Prepared: Shiwei
Date: Jul-30-03
LM-729 Service Manual Rev: A
Revision History
Revision Date Page Items Modification
A Date:Jul-30-03 All First version release;
LM-729 Service Manual Rev: A
Table of Contents
Table of Contents ---------------------------------------------------------------------------------------------------3
1. MONITOR SPECIFICATIONS ---------------------------------------------------------------------------5
2. LCD MONITOR DESCRIPTION ---------------------------------------------------------------------------6
3. OPERATING INSTRUCTIONS ---------------------------------------------------------------------------7
3.1 GENERAL INSTRUCTIONS -------------------------------------------------------------------------7
3.2 CONTROL BUTTONS ------------------------------------------------------------------------------------7
3.3 ADJUSTING THE PICTURE--------------------------------------------------------------------------------7
4. Input/Output Specification - -------------------------------------------------------------------------------10
4.1 Input Signal Connector --------------------------------------------------------------------------------10
4.2 Factory Preset Display Modes -------------------------------------------------------------------------- 11
4.3 Power Supply Requirements ------------------------------------------------------------------------ 12
4.3.1 Input Requirements -------------------------------------------------------------------------------------12
4.3.2 Output Requirements ------------------------------ ------------------------------------------------12
4.4 PANEL SPECIFICATION -------------------------------------------------------------------------------14
4.4.1 Panel Feature ------------------------------------------------------------------------------------------14
4.4.2 Display Characteristics --------------------------------------------------------------------------------14
4.4.3 Optical Characteristics -------------------------------------------------------------------------------14
4.4.4 Parameter guide line for CCFL Inverter ------------------------------------------------------14
5. Block Diagram ------------------------------------------------------------- -----------------------------15
5.1 Monitor Exploded View ------------------------------------------------------------------------------------15
5.2 Software Flow Chart -------------------------------------------------------------------------------------16
5.3 Electrical Block Diagram ------------------------------------------------------------------------------18
5.3.1 Main Board -------------------------------------------------------------------------------------------------18
LM-729 Service Manual Rev: A
5.3.2 Inverter/Power Board -------------------------------------------------------------------------------------19
6. Schematic -------------------------------------------------------------------------------------------------------21
6.1 Main Board -----------------------------------------------------------------------------------------------21
6.2 AUDIO Board -----------------------------------------------------------------------------------------25
6.3 Key Board ------------------------------------------------------- ---------------------------------------26
6.4 Inverter/Power Board -----------------------------------------------------------------------------------27
7. PCB Layout -------------------------------------------------------------------------------------------------29
7.1 Main Board -----------------------------------------------------------------------------------------------29
7.2 Inverter/Power Board -----------------------------------------------------------------------------------31
7.3 Keypad Board And Audio board-------------------------------------------------------------------------34
8. Maintainability --------------------------------------------------------------------------------------------------34
8.1 Equipments and Tools Requirements ----------------------------------------------------------------35
8.2 Trouble Shooting ---------------------------------------------------------------------------------------------33
8.2.1 Main Board --------------------------------------------------------------------------------------------------35
8.2.2 Power/Inverter Board -------------------------------------------------------------------------- ----------38
8.2.3 Key Pad Board ---------------------------------------------------------------------------------------------40
9. White-Balance, Luminance adjustment ----------------------------------------------------------------41
10. EDIT Content -------------------------------------------------------------------------------------------42
11. BOM List -------------------------------------- -----------------------------------------------------------------43
LM-729 Service Manual Rev: A
1.MONITOR SPECIFICATIONS
Driving system TFT Color LCD
LCD Panel Size 43.2cm(17.0")
Pixel pitch 0.264mm( H )x 0.264mm( V )
Viewable angle 90° (H) 90° (V)
Response time (typ.) 25 ms
Video Analog /Digital
Input Sync. Type H/V TTL
H-Frequency 30kHz 80kHz
V-Frequency 55-75Hz
Display Colors Over 16 million Colors
Dot Clock 135MHz
Max. Resolution 1280 x 1024
Plug & Play VESA DDC2BTM
Power Consumption ON Mode <45W
OFF Mode <2W
Maximum Screen Size Horizontal : 13.3"(337.92mm)
Vertical : 10.6"(270.336mm)
Power Source 100~240VAC,47~63Hz
Environmental Operating Temp: 0°C to 40°C
Considerations Storage Temp.: -20°C to 60°C
Operating Humidity : 15% to 90%
Weight (N. W.) Packaged 7.0Kg Unit
Unpackaged 6.0Kg Unit
LM-729 Service Manual Rev: A
2. LCD MONITOR DESCRIPTION
The LCD MONITOR will contain a main board, an inverter/power board, keypad board , Audio board and
external power adapter which house the flat panel control logic, brightness control logic and DDC.
The Inverter board will drive the backlight of panel and the DC-DC conversion.
The Adapter will provide the 12V DC-power to inverter/power board.
Monitor Block Diagram
Flat Panel and
CCFT Drive.
CCFL backlight
Power board
RS232 Connector
(include:adapter,inverter) Main Board
For white balance
adjustment in
factory mode
Keyboard
AC-IN
HOST Computer Video signal, DDC
100V-240V
LM-729 Service Manual Rev: A
3. OPERATING INSTRUCTIONS
3.1 GENERAL INSTRUCTIONS
Press the power button to turn the monitor on or off. The other control buttons are located at front panel of the monitor. By
changing these settings, the picture can be adjusted to your personal preferences.
- The power cord should be connected.
- Connect the video cable from the monitor to the video card.
- Press the power button to turn on the monitor, the power indicator will light up.
3.2 CONTROL BUTTONS
- Power Button:
When pressed, the monitor enters the off mode, and the LED turns blank. Press again to restore normal status.
- Left / Right Button:
When the OSD show on screen, Left/Right Button are used to control the monitor functions. Press to switch functions or adjust
settings. And if the OSD off, Left/Right buttons are used to control the audio volume;
- Auto Adjust Key:
The Auto Adjust Key is used to automatically set the H Position, V Position, Clock and Phase.
- Power Indicator:
Green -- Power On mode.
Orange -- Power Saving mode.
Blank --Power Off Mode.
CONTROL Buttons
A B C D E F
Auto Volume Menu LED Power
A. Menu button
B. Left button/Volume down
C. Right button/Volume up
D. Auto button/Exit
E. Indicator light
F. Power button
3.3 ADJUSTING THE PICTURE
LM-729 Service Manual Rev: A
OSD Table:
Main Main Sub Menu Sub Description Adjust Reset Value
Menu Item Menu Icon Item Menu Range
Icon
Luminance Contrast Contrast from Digital-register. 0-100 Recall Cool
Contrast Value
Brightness Backlight Adjustment 0-100 Recall Cool
Brightness Value
Image Focus Adjust Picture Phase to reduce 0-100 Do Auto Config
Setup Horizontal-Line noise
Clock Adjust picture Clock to reduce 0-100 Do Auto Config
Vertical-Line noise.
Image H. Position Adjust the horizontal position 0-100 Do Auto Config
Position of the picture.
V. Position Adjust the verticalposition of 0-100 Do Auto Config
the picture.
Color Warm N/A Recall Warm Color N/A The Color
Temp. Temperature from EEPROM. Temperature will
Cool N/A Recall Cool Color N/A be set to Cool.
Temperature from EEPROM.
User / Red Red Gain from 0-100 The User R/G/B
Digital-register. value(default is
User / Green Green Gain Digital-register. 0-100 100) will not be
Modified by Reset
User / Blue Blue Gain from 0-100 function.
Digital-register.
Auto Yes N/A Auto Adjust the H/V Position, N/A N/A
Config Focus and Clock of picture.
(Analog-On No N/A Do not execute Auto Config, N/A N/A
ly Model) return to main menu.
Input Select Analog N/A Select input signal from analog N/A N/A
(Dual-Input (D-Sub)
Model) Digital N/A Select input signal from digital N/A N/A
(DVI)
OSD Setup H. Position Adjust the horizontal position 0-100 50
of the OSD.
V. Position Adjust the verticalposition of 0-100 50
the OSD.
OSD Timeout Adjust the OSD timeout. 10-120 10
LM-729 Service Manual Rev: A
Language English N/A Set OSD display language to N/A The Language will
English. be set to English.
Deutsch N/A Set OSD display language to N/A
German.
Français N/A Set OSD display language to N/A
French.
Español N/A Set OSD display language to N/A
Spain.
Italiano N/A Set OSD display language to N/A
Italian.
N/A Set OSD display language to N/A
Simplified Chinese.
Information Information N/A Show the resolution, H/V N/A N/A
frequency and input port of
current iput timing.
Reset Yes N/A Clear each old status of N/A N/A
Auto-configuration and set the
color temperature to Cool.
No N/A Do not execute reset, return to N/A N/A
main menu.
Exit N/A N/A Exit OSD N/A N/A
LM-729 Service Manual Rev: A
4. Input/Output Specification
4.1 Input Signal Connector
4.1.1 Analog D-SUB Connector
PIN NO. DESCRIPTION
DESCRIPTION PI N NO.
1. Red 9. +5V
2. Green 10. Detect Cable
3. Blue 11. NC
4. Ground 12. DDC-Serial Data
5. Ground 13. H-Sync
6. R-Ground 14. V-Sync
7. G-Ground 15. DDC-Serial Clock
8. B-Ground
VGA connector layout
1 5
6 10
11 15
4.1.2 DVI-D Connector
DVI-D Connector to be compliant to the latest DVI-DDWG specification version available.
Pin Meaning Pin Meaning Pin Meaning
TMDS Data2- TMDS Data1- TMDS Data0-
1 9 17
TMDS Data1+ TMDS Data0+
2 TMDS Data2+ 10 18
TMDS Data 0/5 Shield
3 TMDS Data 2/4 11 TMDS Data 1/3 Shield 19
Shield
not connected
4 12 not connected 20 not connected
not connected
5 not connected 13 21 not connected
6 DDC Clock 14 +5V Power 22 TMDS Clock Shield
7 DDC Data 15 Ground 23 TMDS Clock-
Hot Plug Detect
8 Analogue Vertical 16 24 TMDS Clock+
Sync
LM-729 Service Manual Rev: A
1
9
17
4.2 Factory Preset Display Modes
VESA MODES
Horizontal Vertical
Nominal Sync Nominal Sync Nominal Pixel
Mode Resolution Total Frequency Polarity Freq. Polarity Clock
+/- 0.5kHz +/- 1 Hz (MHz)
640x480@60Hz 800 x 525 31.469 N 59.940 N 25.175
VGA 640x480@72Hz 832 x 520 37.861 N 72.809 N 31.500
640x480@75Hz 840 x 500 37.500 N 75.00 N 31.500
800x600@56Hz 1024 x 625 35.156 N/P 56.250 N/P 36.000
800x600@60Hz 1056 x 628 37.879 P 60.317 P 40.000
SVGA
800x600@72Hz 1040 x 666 48.077 P 72.188 P 50.000
800x600@75Hz 1056x625 46.875 P 75.000 P 49.500
1024x768@60Hz 1344x806 48.363 N 60.004 N 65.000
1024x768@60Hz 1312x813 48.78 N 60.00 N 64.000
1024x768@70Hz 1328x806 56.476 N 70.069 N 75.000
XGA
1024x768@72Hz 1304x798 57.515 P 72.074 P 75.000
1024x768@75Hz 1328x804 60.200 N 74.90 N 80.000
1024x768@75Hz 1312x800 60.023 P 75.029 P 78.750
XGA 1152x864@75Hz 1600x900 67.50 P 75.000 P 108.000
1280x1024@60Hz 1688x1066 63.981 P 60.020 P 108.000
SXGA
1280x1024@75Hz 1688x1066 79.976 P 75.025 P 135.000
IBM MODES
Horizontal Vertical
Nominal
Nominal Nominal
Sync Sync Pixel
Mode Resolution Total Frequency Freq.
Polarity Polarity Clock
+/- 0.5kHz +/- 1 Hz
(MHz)
DOS* 720x400@70Hz 900 x 449 31.469 N 70.087 P 28.322
DOS** 640x400@70Hz 800 x 449 31.469 N 70.087 P 25.175
MAC MODES
VGA 640x480@67Hz 864x525 35.000 N 66.667 N 30.240
SVGA 832x624@75Hz 1152x667 49.725 N 74.551 N 57.2832
LM-729 Service Manual Rev: A
4.3 Power Supply Requirements
4.3.1 Input Requirements
PARAMETER RANGE CONDITION
Input AC Voltage 100 to 240VAC RMS Universal input full range
Input Frequency 60Hz @ 100VAC to 50Hz @
240VAC
Input Current Less than 2.0 Amps RMS Input voltage 100 VAC RMS ; 60 Hertz. Parameter
must be reached within 3 seconds of turn-on.
Less than 1.0 Amps RMS Input voltage 220 VAC RMS ; 50 Hertz. Parameter
must be reached within 3 seconds of turn-on.
Input Power Less than 75 Watts
Power factor > 0.5 Input voltage 120 VAC RMS ; 60
Hertz
Inrush Current Less than 30 A peak Input voltage 100 VAC RMS ; 60 Hertz at all
Phase(0, 90, 180, 270 degree)
Less than 50 A peak Input voltage 240 VAC RMS ; 50 Hertz at all
Phase(0, 90, 180, 270 degree)
Input Fusing Fuse should be located internal to the Fuse must be UL/CSA approved. Fuse value must no
adapter, easily accessible when the have to change for 115 VAC or 230 VAC operation
cover is removed
Leakage Current Less than 3.5 mA Input voltage 240 Volts RMS ; 50 Hertz
Hi-Pot Primary to secondary 1.5KVAC for 1 Minute(leakage current 10mA)
1.8KVAC for 1 Minute(leakage current 10mA)
3.0KVAC for 1 Minute(leakage current 10mA)
without Y-cap & Coupling cap.
Prima1ry to Safety Ground 1.5KVAC for 1 Minute(leakage current 10mA)
1.8KVAC for 1 Minute(leakage current 10mA)
4.3.2 Output Requirements
PARAMETER RANGE CONDITION
DC Out 12VDC ± 5% Min 0A Max 3.75A
Load Regulation 12.0V(12.12V) ± 5% 11.4 to 12.6VDC
Dynamic Load Any frequency up to 250Hz(duty 5% for 10% to 100%, 100% to 10% load change for
Regulation 50%) +12Vdc
Ripple & noise 170mVpp at 12VDC Input voltage : 100VAC at 60Hz 240VAC at 50Hz
* Ripple and noise are measured.
Output current less than 7.0A, more than 12.0A Current exceeds maximum rateing more than 20%
protection at 12.0VDC
Leakage Current Less than 0.25 mA Input voltage 100 Volts RMS ; 50 Hertz
Less than 0.5 mA Input voltage 240 Volts RMS ; 50 Hertz
LM-729 Service Manual Rev: A
4.4 PANEL SPECIFICATION
4.4.1 Panel Feature
-High contrast ratio, high aperture structure
-TN(Twisted Nematic) mode
-Wide viewing angle
-High speed response
-SXGA(1280 x 1024 pixels) resolution
-Low power consumption
-2 dual CCFTs(Cold Cathode Fluorescent Tube)
-DE(Data Enable) mode
-COMPACT SIZE DESIGN
4.4.2 Display Characteristics
Items Specification Unit
Display Area 337.92(H) x 270.336(V) mm
Driver element a-Si TFT active matrix
Display color 16.2M Colors
Number of pixels 1280 x 1024 pixel
Pixel Arrangement RGB vertical stripe
Pixel pitch 0.264(H) x 0.264(W) mm
Display Mode Normally White
4.4.3 Optical Characteristics
The optical characteristics are measured under stable conditions at 25 (Room Temperature):
Item Symbol Conditions Min. Typ. Max. Unit Note
Contrast Ratio
250 450 -
(Center of screen)
Rising Tr - 4 5
Response
msec
Time Falling Tf - 12 20
Luminance of White Normal
YL 200 260 - Cd/m2
(Center of screen) =0
Rx =0 0.64
Ry Viewing 0.34
Color Gx 0.29
Chromaticity Typ. TYP.
Gy 0.61
(CIE 1931) -0.03 +0.03
Bx 0.14
Coordinates (CIE)
By 0.07
Wx 0.31
Wy 0.33
Brightness Uniformity [%] 75 80 -
LM-729 Service Manual Rev: A
4.4.4 Parameter guide line for CCFL Inverter
INVERTER MAX BRINGTHNESS (Vadj:5.0v), LOAD=120K X4(ROOM TEMPERATURE 25 4 )
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
Input voltage Vin 10.8 12 13.2 V
Input current Iin 2250 2500 mA FOR 4 LOAD
Output Current Iout 6.0 6.5 7.0 mA FOR 1 LOAD
Frequency F 50.0 55.0 60.0 KHZ FOR 1 LOAD
H.V open Vopen 1450 1600 1750 Vrms NO LOAD
H.V Load Vload 710 810 910 Vrms RL=120K
Start voltage Vst 1650 1750 1850 Vrms RL=CCFL
Protect delay time PDT 0.4 1 4 Sec
INVERTER MIN BRINGTHNESS (Vadj:0.0v), LOAD=120K X4(ROOM TEMPERATURE 25 4 )
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
input voltage Vin 10.8 12 13.2 V
input current Iin 660 750 mA FOR 4 LOAD
Output Current Iout 3.0 3.5 4.0 mA FOR 1 LOAD
Frequency F 50.0 55.0 60.0 KHZ FOR 1 LOAD
H.V open Vopen 1450 1600 1750 Vrms NO LOAD
Start voltage Vst 1650 1750 1850 Vrms RL=CCFL
H.V Load Vload 350 450 550 Vrms RL=120K
LM-729 Service Manual Rev: A
5. Block Diagram
5.1 Monitor Exploded View
LM-729 Service Manual Rev: A
5.2 Software Flow Chart
1
Y
2 3
N
4
5 N
Y
6
7 N
8
Y
9
10 N 11
Y
N 12 13 N
Y Y
N
14 15 16
Y
17
18 N 19
Y
LM-729 Service Manual Rev: A
Remark:
1) MCU initialize.
2) Is the EEprom blank ?
3) Program the EEprom by default values.
4) Get the PWM value of brightness from EEprom.
5) Is the power key pressed ?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed ?
8) Enter factory mode.
9) Save the power key status into EEprom.
Turn on the LED and set it to green color.
Scalar initialize.
10) In standby mode ?
11) Update the life time of back light.
12) Check the analog port, are there any signals coming ?
13) Does the scalar send out a interrupt request ?
14) Wake up the scalar.
15) Are there any signals coming from analog port ?
16) Display "No connection Check Signal Cable" message. And go into standby mode after
the message disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed ?
LM-729 Service Manual Rev: A
5.3 Electrical Block Diagram
5.3.1 Main Board
LCD
Interface
(CN4/CN5)
Scalar gm5126/gm2126
Flash Memory (Include MCU,ADC,OSD)
W39f010P-70B
(U6) (U4)
RGB Hsync,
EPR_SDA RXD
Vsync
EPR_SCL TXD
OSD
DVI-I only
Control
EEPROM D-Sub Connector
Interface
24C16 Connector (CN1)
(CN9)
(U7) (CN2)
DB15_SDA,
DB15_SCL
EEPROM (D-I only)
EEPROM
24C02
24C02
(U1)
(U2)
LM-729 Service Manual Rev: A
5.3.2 Inverter/Power Board
Inverter Block Diagram
V in B u c k C o n n e c to r P a ra lle t-re s o n a n t
in v e rte r
D riv e r D im m in g c o n tro l
C irc u it (P W M )
( )
P a r a lle t- re s o n a n t
V in
in v e rte r
CC FL
D riv e r
C irc u it
D im m in g c o n tro l
PW M
LM-729 Service Manual Rev: A
Power Block Diagram
PWPC7425A3
LM-729 Service Manual Rev: A
6. Schematic
6.1 Main Board
+5V
C1
0.1uF/16V
Connect two grounds at one single point only.
2
1
2
1
GND
D1
D2 BAV99
BAV99
AGND GND
CN1
3
26 1 RX2-IN
3
A_GND T2- RX2- 3
2 RX2+IN
T2+ RX2+ 3
3
SGND 4 +5V
T4- 5
T4+ 6 R1 47 1/16W DDC_SCL_D1
DDCCLK 7 R2 47 1/16W DDC_SDA_D1
DDCDAT 8 C2
A_VSYNC
0.1uF/16V
9 RX1-IN
T1-
2
1
10 RX1+IN
T1+
2
1
11 GND
SGND 12 DVI_5V ZD1 D3
T3- 13 R3 10K 1/16W MLL5232B 5.6V D4
T3+ BAV99
14 BAV99
+5V 15
GND 16 HOT_PLUG
3
HPD
3
RX0-IN RX1- 3
17 GND
T0- RX0+IN RX1+ 3
18
T0+ 19 +5V
SGND 20
T5- 21 GND
T5+ 22
SGND 23 RXC+IN C3
TC+ 24 RXC-IN
TC- 0.1uF/16V
2
1
C1
A_RED
2
1
C2 GND
A_GREEN C3 D5
A_BLUE C4
DIGITAL USE D6 BAV99
A_HSYNC 27
A_GND BAV99
25
A_GND
3
3
RX0- 3
RX0+ 3
+5V
AGND
C4
0.1uF/16V DVI_5V
DVI_5V +5V
2
1
2
1
GND R4 NC
DVI_PLUG 3
2
1
D7
D9 D8 BAV99
BAV99 DDC_SCL_A1 R5 100 1/16W
BAT54C-GS08 DDC_SCL_A 3
DDC_SDA_A1 R6 100 1/16W
3
DDC_SDA_A 3
3
RXC+ 3
RXC- 3
3
C5 UART_DO R8 100 1/16W
UART_DI R10 100 1/16W GPIO5UART_DO 3
0.1uF/16V GPIO4UART_DI 3
MLL5232B 5.6V
MLL5232B 5.6V
1/16W
1/16W
R11 R12
GND
ZD2