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SERVICE MANUAL
SPECTRUM Series
LCD Monitor
LM-700/LM-700A
P/N : 41A50-144
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,
MANUFACTURE DATA : JULY. 2001
REVISE 7 SEP 2001
1
TABLE OF CONTENTS
PAGE
1. SPECIFICATIONS .................................................................................................... 3
1-1 GENERAL SPECIFICATIONS .................................................................... 3
1-2 LCD MONITOR DESCRIPTION .................................................................. 4
1-3 INTERFACE CONNECTOR ........................................................................ 4
2. PRECAUTION AND NOTICES ................................................................................ 5
2-1 ASSEMBLY PRECAUTION ......................................................................... 5
2-2 OPERATIONG PRECAUTION ..................................................................... 5
2-3 STORAGE PRECAUTION ........................................................................... 5
2-4 HIGH VOLTAGE WARNING ....................................................................... 5
3. OPERATING INSTRUCTIONS ................................................................................ 6
4. ADJUSTMENT .......................................................................................................... 7
4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS ............................... 7
4-2 ADJUSTMENTS METHOD .& DESCRIPTION......................... 7-8
4-3 FRONT PANEL CONTROL KNOBS ............................................................ 9
5. CIRCUIT & SOFTWARE DESCRIPTION ................ 10
5-1 THE DIFFERENT BETWEEN EACH PANEL .................................. 10
5-2 SPECIAL FUNCTION WITH PRESS KEY ...................................... 10
5-3 THE OPTIONAL ON MAINBOARD USING SHUTTLE & 4 KEY.. 10
5-4 THE OPTIONAL ON MAINBOARD OR OTHER ACCESSORY USING 10
DIFFERENT PANEL
5-5 SIMPLE INTRODUCTION ABOUT LM500 CHIPSET ........................ 11
5-6 SOFTWARE FLOW-CHART 12
6. A). INTERFACE-BOARD TROUBLE SHOOTING CHART .................... 14
B). INVERTER - MODULE TROUBLE SHOOTING CHART .................... 23
I. CHI-MEI-inverter spec & trouble shooting chart 23
C). ADAPTER TROUBLE SHOOTING CHART & BOM....... 50
D). AUDIO TROUBLE SHOOTING CHART & BOM
E). Main-chip GMZAN1 specifications 54
7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...................................... 64
8. PARTS LISTING ..................................................................................................... 65
9. POWER SYSTEM AND CONSUMPTION CURRENT............................................ 73
10. PCB LAYOUT ................................................................................................... 74
11. MAINBOARD SCHEMATIC DIAGRAM .................................................. 75
12. ADAPTER SCHEMATIC DIAGRAM
13.AUDIO SCHEMATIC DIAGRAM
2
1. SPECIFICATIONS FOR LCD MONITOR
1-1 General specifications
1. LCD-PANEL :
Active display area 17 inches diagonal
Pixel pitch 0.264 mm x 0.264 mm
Pixel format 1280 x 1024 RGB vertical stripe arrangement
2. Display Color :
8-bit, 16.7 million colors
3. External Controls :
Power On/Off, Auto key, Left key, Right key ( for 4-key )
OSD menu Controls
Contrast, Brightness, Focus, Clock,H-position, V-position, Language, Recall-7800, Recall-6500, Reset,
Exit-osd, Red, Green, Blue, Selected Dos-resolution
4. Input Video Signal :
Analog-signal 0.7Vpp
Video signal termination impedance 75 OHM
5. Scanning Frequencies :
Horizontal: 29 KHz - 80 KHz
Vertical: 55 Hz 75 Hz
Pixel clock: 135 MHz
6. Factory Preset Timing : 18
User Timings : 19
Input signal tolerance : H tolerance 1 K, V tolerance
7. Power Source :
Switching Mode Power Supply
AC 100 240 V, 50/60 Hz Universal Type
8. Operating Temperature : 0 - 50 Ambient
Non-operating Temperature : -20 - 60
9. Humidity :
Operating : 20% to 80% RH (non-condensing)
Non Operating : 5% to 95%RH (38.7 maximum wet bulb temperature)
10. Weight :
5.5 kg
11. External Connection : 15Pin D-type Connector, AC power-Cord
12. View Angle : x-axis right/left = 60, y-axis up/down = 40 ,60
13. Outside dimension : Width x Height x Thickness = 422x 449 x 215 mm
14. Plug and Play : VESA DDC1/DDC2B
15. Power saving : VESA DPMS
3
1-2 LCD MONITOR DESCRIPTION
The LCD MONITOR will contain an main board, an Inverter module, keyboard and External Adapter which
house the flat panel control logic, brightness control logic, DDC and DC-DC conversion
The Inverter module will drive the backlight of panel .
The Adapter will provides the 12V DC-power 5 Amp to Main-board and Inverter module .
Monitor Block Diagram
CCFT Drive. Flat Panel and
Inverter CCFL backlight
Main Board or Interface Board RS232 Connector
For white balance
adjustment in
factory mode
Keyboard
AC-IN
100v-240v ADAPTER
HOST Computer Video signal, DDC
1-3 Interface Connectors
(A) AC-Power Cable
(B) Video Signal Connectors and Cable
(C) External Adapter
4
2. PRECAUTIONS AND NOTICES
2-1 ASSEMBLY PRECAUTION
(1) Please do not press or scratch LCD panel surface with anything hard. And do not soil LCD panel surface
by touching with bare hands (Polarizer film, surface of LCD panel is easy to be flawed)
In the LCD panel, the gap between two glass plates is kept perfectly even to maintain display
characteristic and reliability. If this panel is subject to hard pressing, the following occurs :
(a) Uniform color (b) Orientation of liquid crystal becomes disorder
(2) Please wipe out LCD panel surface with absorbent cotton or soft cloth in case of it being soiled.
(3) Please wipe out drops of adhesive like saliva and water in LCD panel surface immediately.
They might damage to cause panel surface variation and color change.
(4) Do not apply any strong mechanical shock to the LCD panel.
2-2 OPERATING PRECAUTIONS
(1) Please be sure to unplug the power cord before remove the back-cover. (be sure the power is turn-off)
(2) Please do not change variable resistance settings in MAIN-BOARD, they are adjusted to the most suitable
value. If they are changed, it might happen LUMINANCE does not satisfy the white balance spec.
(3) Please consider that LCD backlight takes longer time to become stable of radiation characteristic in low
temperature than in room temperature.
(4) Please pay attention to displaying the same pattern for very long-time. Image might stick on LCD.
2-3 STORAGE PRECAUTIONS
(1) When you store LCD for a long time, it is recommended to keep the temperature between 0
without the exposure of sunlight and to keep the humidity less than 90% RH.
(2) Please do not leave the LCD in the environment of high humidity and high temperature such as 60
90%RH.
(3) Please do not leave the LCD in the environment of low temperature; below -15 .
2-4 HIGH VOLTAGE WARNING
The high voltage was only generated by INVERTER module, if carelessly contacted the transformer on this
module, can cause a serious shock. (the lamp voltage after stable around 600V, with lamp current around 8mA,
and the lamp starting voltage was around 1500V, at Ta=25 )
5
3. OPERATING INSTRUCTIONS
This procedure gives you instructions for installing and using the LM700 LCD monitor display.
1. Position the display on the desired operation and plugin the power cord into External Adapter AC outlet.
Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis
and cabinet to the electrical conduct ground. If the AC outlet in your location does not have provisions for
the grounded type plug, the installer should attach the proper adapter to ensure a safe ground potential.
2. Connect the 15-pin color display shielded signal cable to your signal system device and lock both screws
on the connector to ensure firm grounding. The connector information is as follow:
1 5
6
10
11 15
15 - Pin Color Display Signal Cable
PIN NO. DESCRIPTION PIN NO. DESCRIPTION
1. RED 9. 5V power from VGA-card
2. GREEN 10. GND
3. BLUE 11. SYNC. GND
4. GND 12. SDA
5. GND 13. HORIZ. SYNC
6. GND-R 14. VERT. SYNC
7. GND-G 15. SCL
8. GND-B
3. Apply power to the display by turning the power switch to the "ON" position and allow about thirty
seconds for Panel warm-up. The Power-On indicator lights when the display is on.
4. With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness
and contrast to the most pleasing display, or press auto-key to get the best picture-quality.
5. This monitor has power saving function following the VESA DPMS. Be sure to connect the signal cable
to the PC.
6. If your LM700 LCD monitor requires service, it must be returned with the power cord & Adapter.
6
4. ADJUSTMENT
4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS
Adjustments should be undertaken only on following function : contrast, brightness focus, clock, h-position,
v-position, red, green, blue since 6500 color & 7800 color.
4-2 ADJUSTMENT METHOD
Press MENU button to activate OSD Menu or make a confirmation on desired function, Press Left/Right button
to select the function or done the adjustment.
1. White-Balance, Luminance adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance
adjustment.
Before started adjust white balance ,please setting the Chroma-7120 MEM. Channel 5 to 7800 color and
MEM. channel 6 to 6500 color, ( our 7800 parameter is x = 296 10, y = 311 10, Y = 160 5cd/m2
and 6500 parameter is x = 313 10, y = 329 10, Y = 160 5 cd/m2)
How to setting MEM.channel you can reference to chroma 7120 user guide or simple 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
Press MENU button during 2 seconds along with plug in the DC-power cord will activate the factory
mode, and the OSD screen will located at left top of panel.
I. Bias (Low luminance) adjustment :
1. Press " AUTO" button , and wait for message " Pass" ,check the Blacklevel value on
OSD should be large than 30, if less than 30 that means the offset calculation FAIL,
please manual adjust the blacklevel to value 43
2. set the contrast and brightness on OSD window to maximal value , RGB to "50"
3. adjust the VR501 on INTERFACE board until chroma 7120 measurement reach the
value Y=240 cd/m2 cd/m2
II. Gain adjustment :
a. adjust 7800 color-temperature
4. Set the Contrast of OSD function to 40, Brightness to 48
5. Switch the chroma-7120 to RGB-mode (with press "MODE" button )
6. switch the MEM.channel to Channel 05 ( with up or down arrow on chroma 7120 )
7. The lcd-indicator on chroma 7120 will show x = 296 , y = 311 , Y = 160
cd/m2
8. Adjust the RED on OSD window until chroma 7120 indicator reached the value
R=100
7
9. adjust the GREEN on OSD, until chroma 7120 indicator reached G=100
10. adjust the BLUE on OSD, until chroma 7120 indicator reached B=100
11. repeat above procedure ( item 8,9,10) until chroma 7120 RGB value meet the tolence
=100
12. switch the chroma-7120 to xyY mode With press "MODE" button
13. Adjust the Contrast on OSD window until the Y measurement on chroma 7120 reached
the value Y= 180 cd/m2
14. Press 78 on OSD window to save the adjustment result
b. adjust 6500 color-temperature
1 Set the Contrast of OSD function to 40, Brightness to 48
2 Switch the chroma-7120 to RGB-mode (with press "MODE" button )
3 switch the MEM.channel to Channel 06 ( with up or down arrow on chroma 7120 )
4 The lcd-indicator on chroma 7120 will show x = 313 , y = 329 , Y = 160
2
cd/m
5 Adjust the RED on OSD window until chroma 7120 indicator reached the value R=100
6 adjust the GREEN on OSD, until chroma 7120 indicator reached G=100
7 adjust the BLUE on OSD, until chroma 7120 indicator reached B=100
8 repeat above procedure ( item 5,6,7) until chroma 7120 RGB value meet the tolence =100
9 switch the chroma-7120 to xyY mode With press "MODE" button
10 Adjust the Contrast on OSD window until the Y measurement on chroma 7120 reached
the value Y= 180 cd/m2
11 Press 65 on OSD window to save the adjustment result
Turn the POWER-button off to on to quit from factory mode ( in USER-mode, the OSD window
location was placed at middle of screen)
8
2. Clock adjustment
Set the Chroma at pattern 63 (cross-talk pattern) or WIN98/95 shut-down mode (dot-pattern).
Adjust until the vertical-Stripe-shadow as wide as possible or no visible.
This function is adjust the PLL divider of ADC to generate an accurate pixel clock
Example : Hsyn = 31.5KHz Pixel freq. = 25.175MHz (from VESA spec)
The Divider number is (N) = (Pixel freq. x 1000)/Hsyn
From this formula, we get the Divider number, if we fill this number in ADC register (divider register),
the PLL of ADC will generate a clock which have same period with above Pixel freq.(25.175MHz) the
accuracy of this clock will effect the size of screen.(this clock was called PIXEL-CLOCK)
3. Focus adjustment
Set the Chroma at pattern 63 (cross talk pattern) or WIN98/95 shut down mode (dot-pattern).
Adjust the horizontal interference as less as possible
This function is adjust the phase shift of PIXEL-CLOCK to acquire the right pixel data .
If the relationship of pixel data and pixel clock not so match, we will see the horizontal interference on
screen ,we only find this phenomena in crosstalk pattern or dot pattern , other pattern the affect is very
light
4. H/V-Position adjustment
Set the Chroma to pattern 1 (crosshatch pattern) or WIN98/95 full-white pattern confirm above item 2 & 3
functions (clock & focus) was done well, if that 2 functions failed, the H/V position will be failed too.
Adjust the four edge until all four-edges are visible at the edge of screen.
5. MULTI-LANGUAGE function
There have 5 language for selection, press "MENU" to selected and confirm , press " LEFT" or " RIGHT"
to change the kind of language ( English , Deutch , Francais, Espanol, Italian)
6. Reset function
Clear each old status of auto-configuration and re-do auto-configuration ( for all mode)
This function also recall 7800 color-temperature , if the monitor status was in " Factory-mode" this reset
function will clear Power-on counter ( backlight counter) too.
7. OSD-LOCK function
Press Left & Right key during switching on the monitor, the access to the OSD is locked, user only has
access to " Contrast, Brightness, Auto-key ".
If the operator pressed the Left & Right during switching on the monitor again , the OSD is unlocked.
8. View Power-on counter and reset the Power-on counter( if not necessary , no suggest to entry factory
mode)
The Power-on counter was used to record how long the backlight of panel already working, the backlight
life time was guarantee minimal 25000 hours, the maintainer can check the record only in factory mode.
Press MENU button for 2 seconds along with plug-in DC power cord will be in factory mode, and the
OSD screen will located at left top of panel but take cautions don't press icon "78" & "65", if you
press 78/65 , your white-balance data will overlap with the new-one, and you must perform the white-
balance process again.
The result of counter was place at top of OSD, the maximal of record memory was 65000 hours, if exceed
65000 hours the counter will keep in 65000 hours until press " RESET" at osd-menu in factory mode.
The " RESET" function in factory mode will execute following function:
1. clear the Power-on counter to zero hours
2. clear old auto-configuration status for all mode , so the monitor will automatically re-do auto-config
when change to next mode or power on-off
4-3 FRONT PANEL CONTROL KNOBS
Power button : Press to switch on or switch off the monitor.
Auto button : to perform the automatic adjustment from CLOCK, FOCUS, H/V POSITION, but no affect the
color-temperature
Left/Right button : select function or do an adjustment.
MENU button : to activate the OSD window or to confirm the desired function
9
5. CIRCUIT-DESCRIPTION
5-1 SPECIAL FUNCTION with PRESS-KEY
A). press Menu button during 2 seconds along with plug-in the DC Power cord:
That operation will set the monitor into "Factory- mode", in Factory mode we can do the White balance
adjustment with RS232 , and view the Backlight counter (this counter is use to record the panel activate
hours ,for convenient the maintainer to check the panel backlight life time)
In Factory mode, OSD-screen will locate in left top of screen.
Press POWER-button off to on once will quit from factory mode and back to user-mode.
B). Press both Left & Right button along with Power button off to on once will activate the OSD-LOCK
function, repeat this procedure will disable OSD-LOCK
In OSD-LOCK function, all OSD function will be lock , except Contrast and Brighness
OSD-INDEX EXPLANATION
1. CABLE NOT CONNECTED: Signal-cable not connected.
2. INPUT NOT SUPPORT:
a. INPUT frequency out of range: H > 81kHz, v > 75Hz or H < 28kHz, v < 55Hz
b. INPUT frequency out of VESA-spec. (out of tolerance too far)
3. UNSUPPORT mode, try different Video-card Setting:
Input frequency out of tolerance, but still can catch-up by our system (if this message show, that means, this
is new-user mode, AUTO-CONFIG will disable)
5-2 THE Different on MAINBOARD or other ACCESSORY when using different PANEL type
1). The MCU software should be change
example : for CHI-MEI panel , the MCU part-number is 56A-1125-61-M
for Hyundai panel , the MCU part-number is 56A-1125-61-Y
and the other ACCESSORY when use different panel type should be change as following:
1). The INVERTER module for CHI-MEI panel part-number is 79AL17-1-S
for Hyundai panel the INVERTER part number is 79A-L17-3-S
2). The cable to Panel side for CHI-MEI panel part number is 95A8018-30-1
for HYUNDAI panel is 95A8018-30-3
3). The Dsub cable for CHI-MEI is 89A-174D-5BF-GLF,
for Hyundai is 89A-174-L17-3.
4). The Mechanical accessory is change or adding as follow;
CHI-MEI PANEL M170E1 Hyundai PANELHT17E11-100
MAIN-FRAME 15A5684-1 15A5705-1
Panel 750ALCD170-3 750ALCD170-4
10
5-3 SIMPLE-INTRODUCTION about LM700 chipset
1. GMZAN1 ( all-in-one chip solution for ADC, OSD, scalar and interpolation) :
USE for computer graphics images to convert analog RGB data to digital data with interpolation process,
zooming, generated the OSD font , perform overlay function and generate drive-timing for LCD-PANEL.
2. M6759 (ALI- MCU, type 8052 series with 64k Rom-size and 512 byte ram) :
Use for calculate frequency, pixel-dot , detect change mode, rs232-communication, power-consumption
control, OSD-index warning , ...etc.
3. 24LC21 (MicroChip IC) :
EePROM type, 1K ROM-SIZE, for saving DDC-CONTENT.
4. 24C04 (ATMEL IC) :
EePROM type, 4K ROM-SIZE, for saving AUTO-config data, White-balance data, and Power-key status
and Backlight-counter data.
5. LM2569S( NS brand switching regulator 12V to 5V with 3A load current) .
6. AIC 1084-33CM (AIC brand linear regulator 5V to 3.3V)
7. LVDS ( use NOVATEK NT7181F)
Convert the TTL signal to LVDS signal
The advantage of LVDS signal is : the wire can be lengthen and eliminate wire number , low EMI .
LVDS signal is high frequency but low voltage, only 0.35 VPP ,the frequency is seven times higher than TTL
MODULE-TPYE COMPONENT :
1. ADAPTER : CONVERSION-module to convert AC 110V-240V to 12VDC, with 5.0 AMP
2. INVERTER : CONVERSION-module to convert DC 12V to High-Voltage around 1600V, with frequency
30K-80Khz, 7mA-9Ma
11
Main-board Block diagram
Input analog RGB &
H,V,& ddc signal &
Rs232 communication
GMZAN1 (U200)
Data Digital RGB
DDC-chip
LVDS chip (U601,
U602) PANEL
Panel Control Signal:
Oscillator 50 mhz Dhs, Dvs, Dclk
Panel Power 5V
Communication signal:
Hclk,Hfs,Hdata0
Panel-Power Control
MCU ( U302 ) (U202)
Crystal 20 mhz
Keyboard module INVERTER module
EXTERNAL-
ADAPTER
12
5-4 SOFTWARE FLOW CHART
I. Power-On Subrotine CHART
Initial MCU I/O, Interrupt vector & Ram
Yes
Initial 1.POC (backlight counter)
Check Eeprom is empty ? 2. Clr all mode value
No
OK
IF not same, overwrite the data with backup value.
Check Previous power-switch status from Eeprom, & other system status
Initial GMZAN1
Yes
Check if in Factory mode?(when power-on,press the
MENU Button will be in FACTORY mode) SET factory mode flag
No
Clear factory mode flag
MAIN-SUBROTINE LOOP
13
II. MAIN SUBROTINE LOOP
Main loop start
Process Power-saving status ( according to below flow-chart result)
)
Check GMZAN IFM status .is change or not.
And check Signal cable status ( cable not connected or not )
** IFM is the register which measured the HSYN & Vsyn status
No Yes, IFM have change Wake-up GMZAN1
Yes (because GMZAN1 was in
Is current system status in Power-saving ? partial sleeping state)
No
Yes
Check the IFM result is in the standard Set mode index & parameter
Mode table ? Set change mode flag
No Yes
Check the IFM result is in the user mode
table ?
No
Out of range ( input not support) be
confirm
No confirm the frequency ( Hsyn or Vsyn) from IFM already
been changed ? ( check the change mode flag)
Yes , freq had been change
Process ( turn off OSD , setting GMZAN1according to
above parameter,set LED status, set backlight status)
No
Check Auto-config mode flag already been set? Do Auto-config
automatically
Yes
Read Key status and Process on OSD-screen
Yes
if the RS232 buffer is full,
Check Factory mode flag= 1 process the command( while
adjust white-balance in factory
mode)
No
Monitoring the time-out of osd status ( if no key input persist for
10 sec , the osd time-out counter will trigger )
14
6. A). Interface-Board Trouble-Shooting chart
*Use the PC Win 98 white pattern, with some icon on it, and Change the Resolution to 640x480 60 Hz / 31 KHz
**NOTICE : The free-running freq. of our system is 48 KHz / 60 Hz, so we recommend to use another
resolution to do trouble shooting, this trouble shooting is proceed with 640x480 @60Hz 31Khz
I. NO SCREEN APPEAR
DC-Power Part
Measured Input DC-voltage ( J1)= 12 V?
Measured U305 AIC 1084 pin 2 = 3.3V? Check Correspondent component.
Measured U904 LT1117 pin 2= 3.3V? Is there any shortage or cold solder?
Yes, all DC level exist
Disconnected the Signal cable( Loose the Yes, there have OSD show
Signal cable ),Is the screen show "Cable Not Connected the Signal cable again, Led Green
Connected" ? Check LED status.
No, nothing is show Led Orange
Check Power switch is in Power-on
status , and check if Power switch had Replace MCU
Connected the Signal cable again, been stuck ?
Check LED status.
Led orange
OK, Keyboard no stuck
Led Green
NG Check Correspondent
component short/open
Check the Wire-Harness from CN601,CN602 Measured RGB (r200,r201,r202) H,V Input at U401 ( Protection Diode )
was tight enough?, pin 9 ,4 ,was there have signal ? and Signal cable
check the Wire connection to panel side too bad ?
OK,input Normal
OK,Wire tight enough
Measured Oscillator Block
Check Panel-Power Circuit Block Oscillator U201 & Crystal X300
OK,Panel Power OK OK,clock normal
Check communication pin between U200 &
Check U200 Data-output Block
MCU pin 2,6,7. , is it have transition?
OK, U200 data OK
OK, Mcu have transition NG, no transition
Replace Inverter and Check
Inverter control relative circuit
Replace U302 (MCU)
& check Reset pin 10
Re-do White balance adjust Replace U200 (Gmzan1) must be change from High to
low when first AC power plug-
in
OK OK
Note: 1. if Replace "MAIN-BOARD" , Please re-do "DDC-content" programmed & "WHITE-Balance".
2. if Replace " INVERTER" only, Please re-do " WHITE-Balance"
15
PANEL-POWER CIRCUIT Check the PPWR panel power relative circuit,
R223, Q200,U202(pin 5,6,7,8)
NG In normal operation, when LED =green, R223
check R225 should have response from 12V to 0V
should =0 v,
When we switch the power switch from on to off If PPWR no-response when the power switch
Turn on and turn off, replace the U200-GMZAN1
OK,R225 have response
NG, no Voltage
Measured the U202 pin 5,6,7,8= 5 V? Check U202 pin 1,2,3,4= 5V
Replace U202 ( Nmos, SI9933)
OK NG
OK
Check U304 relative circuit.(R905,T300..)
INVERTER Control Relative Circuit
NG
Measured the inveter connector CN303 Check the Bklt-On relative circuit, R315, Q304, R311,
Pin 1=12V, pin 3 on/off control=5V (on) In normal operation, when LED =green,
R315 Bklt-On should =0 v,
NG, still no screen If Bklt-On no-response when the power switch turn on-off,
Replace the MCU
NG
Replace INVERTER to new-one, and Replace INVERTER-module
Check the screen is normal ?? & Re-do white balance
OK
OSCILLATOR BLOCK
NG,no transition
Measured U201 Oscillator output R215= 50mhZ ?
Replace Oscillator U201
OK, has transition NG,no transition
Measured X300 Crystal output R340= 20mhZ ? Replace Crystal X300
OK
U200-DATA OUTPUT
NG , no transition
Measured PCLK(L207)
PVS,PHS (pin 73,74 from U200 )
Replace GMZAN1 (U200) or replace
Is there have any transition?
MAINBOARD.
Pclk around 47MHz to 57MHZ ,
PVS=60.09Hz , PHS around 67 KHz ??(refer to
input signal=640x480@60 Hz 31k, and LED is
green)
If MainBoard being replace , please
do the DDC content reprogrammed
OK
16
II (a) THE SCREEN is Abnormal , stuck at white screen, OSD window can't appear, but
keyboard & LED was normal operation.
At general, this symtom is cause by missing panel data or panel power, so we must check our
wire-harness which connected to panel or the panel power controller (U202)
Check if the Wire harness from CN601 & CN602 loose?
Tighten it.
Check the wire on both Panel-side and Mainboard side.
Yes, tight enough
Check the Panel-Power circuit as above (page 15)
U202 pin 5,6,7,8 ,must be 5V
Yes, Voltage normal
Check U904,which convert the 5V to
Check the LVDS-Power L603,L604,L601,L602,L900= 3.3V ?
3.3V
Yes, Voltage normal
Check U200 DATA-OUPUT block as
Check the both U601 & U602 LVDS-Input pin 31= 45mhz above ( page 15)
65mhz, and pin 27 = Vsyn freq, pin 28 = 45khz- 65 khz
NG,no data output
Yes, Frequency normal
Replace both LVDS chip ( U601 & U602) Check OSCILLATOR Block as
above ( page 15)
OK,all clock is normal
Replace U302 MCU and check it RESET
pin 10 ,must be turn high to low when first
AC power-on
OK, reset is normal
Check U200 DATA-OUTPUT block again
NG,still no data out
Replace U200 GMZAN1
II. (b)The screen had the Vertical Straight Line, might be stuck in Red, Green, Blue
That symptom is cause by bad Panel issue ( might be the Source IC from Panel is cold solder or
open loop ) so REPLACE THE PANEL TO NEW ONE.
17
KEYBOARD BLOCK check
NG
Check U302 MCU pin 43,42,41,40,39 at Mechanical was stuck, Check !
High state(5V)? without press any key
OK
NG Replace Tact-switch SW105 at keyboard if still
Press power key and check U302 pin 43 no work replace U302 MCU at main-board and
= low (0V) ? check MCU relative reset circuit, and crystal
OK
Check U302 pin 38 (LED green) will have OK
transition from hi to low or low to hi when we If still no Led green indicator, check Q102,
press the power key?? R106 & LED at keyboard !! cold solder or bad
NG, MCU no response
Check U302 pin 20= 20MHz ? and pin 44 NG
(VDD)=5V ? and pin 10 (reset)=0V ? at normal If one of this item was NG, check the relative
condition circuit
OK Keep transition, that means eeprom no response
Without press key and change mode, Check U302 NG
pin 16,17(sda,scl)= hi 5V ? or keep transition ? Check U300 eeprom 24LC04 relative circuit,
check U300 pin 7 = low?
NG OK
OK, no keep transition
Check JP202 is Check U300 pin 8
Replace U302 MCU connect ? (vdd)= 5V, and check
R300,R301 cold solder
Replace eeprom
18
POWER-BLOCK check
**Note : the Waveform of U304 pin 2 can determined the power situation
1. stable rectangle waveform with equal duty, freq around 150K-158KHz
that means all power of this interface board is in normal operation
,and all status of 5V & 3.3V is working well
2. unstable or uneven rectangle waveform without same duty, that means ABNORMAL operation was
happened, check 3.3V or 5V ,if short-circuit or bad component
3. rectangle waveform with large spike & harmonic pulse on front side , means all 3.3v is no load, U200
Gmzan1 was shut-down, and only U302 MCU still working , that means the monitor is in power saving
status , all power system is working well .
NG
Measure input power at U304 LM2596 pin 1= Check ADAPTER and connector if loose?
12V ?
OK
NG Check U304 pin 2 is a unstable rectangle wave ?
Check U304 pin 2 is a stable rectangle wave?
Around 150k-158kHz stable rectangle wave
with equal duty without any spike or harmonic
pulse? OK, unstable wave
NG, with
harmonic
Check all 3.3V & 5V power, there is
OK pulse
short circuit or bad component was
happened
The interface board power is good
The interface board is in power-
saving state, press power key to wake
up & check your signal input
19
III.ALL SCREEN HAS INTERFERENCES OR NOISE, CAN'T BE FIXED BY AUTO KEY
** NOTE: There is so many kind of interferences, 1). One is cause by some VGA-CARD that not meet VESA spec or
power grounding too bad that influence our circuit
2).other is cause by external interferences, move the monitor far from electronic equipment.( rarely
happened)
Use DOT-pattern, or win98/99 shut-down
mode pattern, press "AUTO" key, was the OK
END
interferences disappear ??
NG, interferences still exist
OK
Adjust "FOCUS" step by step, until the
END
horizontal interferences disappear
NG
Yes, has extension Put away the additional cable
Does your signal-cable have an additional May be the additional cable grounding is
cable for extension ?? not quite well
NO additional extension cable
NO, all mode
Does your noise only exist in one mode only?
(ex: only at 1280x1024 @ 75 Hz, other is normal) Change the Signal-cable to new-one or
Try other brand VGA-CARD
(make sure just only that brand VGA-
CARD has this problem ,contact RD-
taipei)
That was cause by you VGA-CARD setting, your VGA
card timing backporch/frontporch exceed vesa timing too
far, for some new AGP-VGA-CARD such situation
always happened
So in your control-panel icon ,select monitor ,setting ,
advance ,screen-adjust,at
Size icon, increase step by step slowly, press ""AUTO"
key every step you increase the SIZE . repeat the
procedure( increase/decrease SIZE one-step and press
AUTO) until the interferences disappear, press "APPLY"
to save in your VGA
20
There is an interferences in DOS MODE
NOTE :the criteria of doing AUTO-CONFIGURATION : must be a full-size screen, if the screen not full , the auto-
configuration will fail. So in dos mode ,just set your "CLOCK" in OSD-MENU to zero or use some EDITOR
software which can full fill the whole screen (ex: PE2, HE) and then press "AUTO"
Or you can use "DOS1.EXE" which attached in your Driver disk to optimize DOS mode performance
V. THE PANEL LUMINANCE WAS DOWN
Use white pattern and resolution 1280x1024 @ 60Hz , CHROMA 7120 measured the center of panel
Set Contrast, brightness =maximal, RGB= 50 If Y can reach 190 cd/m2 that means
Quit from OSD-screen, measured Y(luminance) The lamp still working well, so we just re-do the
With chroma 7120, check Y= 240±10 CD/M2 ? white-balance process
As following procedure
OK
NG
Adjust VR201 until maximal, measured Y = Use white-pattern, press MENU button along
240±10 cd/m2 ? OK with AC power-plug in ( you will in factory
mode) The OSD-menu will be at left-top of
screen,
NG
If the Y less than 160 cd/m2 (after the VR201=
MAX, contrast, brightness = max) then change the
LAMP of panel press AUTO button to automatically adjust
blacklevel value, you will see the sign PASS ,if
FAIL , manual adjust the blacklevel until value 43 !
Set contrast, brightness to max, and turn the VR201
to max , wait for 20 minutes until the luminance Y
stable
The Y should be larger than 200 cd/m2
(for panel which already use for a year, the Y
luminance might be a little down, around 180
cd/m2, there is acceptable too)
Follow this manual page 7 item 4-2 method to
more detail procedure for do a white-balance
adjust
21
6 B). Inverter MODULE Spec &Trouble Shooting Chart
In LM700 model , we use CHI-MEI panel, and the INVERTER PROVIDER is SAMPO-
CORPORATION
I.) TROUBLE SHOOTING OF CHI-MEI INVERTER (part no : 79AL17-1-S)
TYPE: L0037 FOR CHI-MEI 17"PANEL
SAMPO CORPORATION
TROUBLE SHOOTING OF CHI-MEI INVERTER ( DIVTL0037-D42- -)
1.SAMPO PART NO .: L0037 ,AOC PART NO.: 79AL17-1-S
2.SCOPE : this is to specify the requirements of the subject parts used in
CHI-MEI (M170E1) 17 inch (4 C.C.F.L.) LCD monitor.
3.CONNECTOR PIN ASSIGMENT:
4-1. CON1: INPUT
PIN SYMBOL DESCRIPTION
1 Vin Input voltage: 12V
2 Vin Input voltage: 12V
3 ON/OFF ON: 3V OFF:0V
4 Dimming Dimming range (0V~+5.0V)
5 GND GND
4-2. CON2,CON3 : OUTPUT
MODEL NO. : SM04(4.0)B-BHS-1-TB
PIN SYMBOL DESCRIPTION
1 HV OUTPUT Input H.V to lamps
2 HV OUTPUT Input H.V to lamps
3 N.C. N.C.
4 RETURN Return to control
22
SAMPO CORPORATION
TROUBLE SHOOTING OF CHI-MEI INVERTER ( DIVTL0037-D42- -)
5.FUNCTION SPECIFICATIONS:
The data test with the set of SAMPO, and the test circuit is as below.
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
Input voltage Vin 10.8 12 13.2 V
Input current Iin -- 2200 2500 mA
output current Iout FOR 1 CCFL
LOAD:120K
adj:0v( min.) (min) 2.1 2.6 3.1 mA
Output current Iout FOR 1 CCFL
LOAD:120K
adj.:5 v(max.) (max) 5.5 6.0 6.5 mA
Frequency F 40 50 60 KHZ
H.V open Vopen 1400 1500 1600 Vrms NO LOAD
H.V Load Vload 630 730 830 Vrms RL=120K
6. FUNCTION LOAD CIRCUIT:
CON1
1 2 3 4 5
PIN SYMBOL
1 Vin 12V
2 Vin 12V
3 ON/OFF
4 Dimming
5 GND
23
SAMPO CORPORATION
TROUBLE SHOOTING OF CHI-MEI INVERTER ( DIVTL0037-D42- -)
7.CIRCUIT DIAGRAM:
D
D
D
D
D
D
D
D
G
S
S
S
G
S
S
S
24
SAMPO CORPORATION
TROUBLE SHOOTING OF CHI-MEI INVERTER ( DIVTL0037-D42- -)
8.PART LIST
8-1 COMPONENTS LIST:
NO. REF. PART NAME PART NUMBER QTY DESCRIPTION SUPPLIER REMARK
1. CON1 CONNECTOR VCNCP0015-EJSTA 1 S5B-PH-SM3-TB JST
2. CON2,3 VCNCP0014-PJSTA 2 SM04(4.0)B.BHS-1-TB JST
VCNCP0014-ZGLEA GL SM02(4.0)-WH2 GEAN-LEA
3. R1,2 RESISTOR VRMHNVA--103J-A 2 SMD 0603 10K YAGEO
4. R3,4 VRMHNVA--683J-A 2 SMD 0603 68K YAGEO
5. R5,6 VRMHNVA--912J-A 2 SMD 0603 9.1K YAGEO
6. R7,8 VRMHNVA--274J-A 2 SMD 0603 270K YAGEO
7. R9,10 VRMHNVA--R00J-A 2 SMD 0603 0 YAGEO
8. R11,12, VRMCNV8--102F-A 4 SMD 0805 1K YAGEO
31,32
9. R13,14 VRMHNVA--752J-A 2 SMD 0603 7.5K YAGEO
10. R15,16 VRMHNVA--433J-A 2 SMD 0603 43K YAGEO
11. R17,18 VRMHNVA--271J-A 2 SMD 0603 270 YAGEO
12. R27 VRMHNVA--472J-A 1 SMD 0603 4.7K YAGEO
13. R28,29, VRMHNVA--392J-A 2 SMD 0603 3.9K YAGEO
14. R23,24, VRMBNV4--102F-A 4 SMD 1206 1K YAGEO
25,26
15. R19,20 VRMCNV8--183F-A 2 SMD 0805 18K YAGEO
16. R21,22 VRMCNV8--133F-A 2 SMD 0805 13K YAGEO
17. R33 VRMHNVA--363J-A 1 SMD 0603 36K YAGEO
18. Q1 TRANSIST0R VSTDTC144WKA--A 1 SMD DTC144WKA ROHM
19. Q2 VSTDTA144WKA--A 1 SMD DTA144WKA ROHM
20. Q3,5 VSTSST3904----A 2 SMD SST3904-T116 ROHM
VSTMMBT3904-A
SMD MMBT3904 MOTOROLA
21. Q4,6 VSTCEM9435A-----A 2 SMD CEM9435A CET
22. Q7,8,9, VST2SD2150----A 4 SMD 2SD2150 ROHM
10
23. C1,2 CAPACITOR VCLFCN1EY224Z-A 2 SMD 0805 0.22 µ /25V TDK
24. C3,4,,9 VCLRCN1EB104K-A 3 SMD 0805 0.1 µ /25V TDK
25. C5 VCEATU1EC336M-- 1 DIP UGX 33 µ /25V SANYO
VCEATU1VC476M-- DIP UGX 47 µ /35V
25
SAMPO CORPORATION
TROUBLE SHOOTING OF CHI-MEI INVERTER ( DIVTL0037-D42- -)
8-2 COMPONENTS LIST:
NO. REF. PART PART NUMBER QTY DESCRIPTION SUPPLIER REMARK
NAME
26. C6 VCLRCN1HB102K-A 1 SMD 0805 TDK
1000PF/50V
27. C10,11 VCLRCN1EB333K-A 2 SMD 0805 0.033 TDK
µ /25V
28. C12,13 VCMEBF2AB184J-P 2 DIP 0.18µ /100V ARCO
VCMECF2AC184J-P DIP 0.18µ /100V THOMSON
29 C14,15,19, CAPACITOR VCDSEU3SL220K-- 4 DIP 22PF/3KV TDK
20
30. C7,16,17 VCLFCN1EY105Z-A 3 SMD 0805 1 µ /25V TDK
31. C18 VCLFCN1CY225Z-A 1 SMD 0805 2.2 µ /16V TDK
32. C21 VCLFBN1CY475Z-A 1 SMD 0805 4.7 µ /16V TDK
33. D1,2 DIODE VSDRLS4148----A 2 SMD RLS4148 ROHM
34. D3,4 VSDRB160L40---A 2 SMD RB160L40 ROHM
VSDSMA160-----A SMD SMA160 TPC
35. D5,6 VSZRLZ8.2B-----A 2 SMD RLZ8.2B ROHM
36. D7,8 VSDDA204K-----A 2 SMD DA204K ROHM
37. I.C I.C VSITL1451ACNS-A 1 SMD TL1451ACNS TEXAS
38. F1 FUSE QFS-N302FIDZD-A 1 SMD FUSE 3.0A/63 LITTLE Attachment
QFS-Z302FIDZD-A SMD FUSE 3.0A/63 BUSSMANN (FEC1Q2)
40. L1,2 COIL RCHOL0007ID151A 2 DIP 150µ YST Attachment 1
RCHOL0007ID151- 150µ
41. PT1,2 TRANS RCVT-1207ID-Z-A 2 SMD YST-1207 YST Attachment 2
RCVT-1207ID-Z-C SMD WT-1207 WT Attachment 2-1
42. PCB PCB QPWBGL983IDLF3- 1 QPWBGL983IDLF3- EISO
LONGMAW
26
SAMPO CORPORATION
TROUBLE SHOOTING OF CHI-MEI INVERTER ( DIVTL0037-D42- -)
9. TROUBLE SHOOTING
9-1 NO POWER:
CHECK ON FUSE
. F1 Vin=12 FAIL TO CHANGE
F1= 4.0A/63V
TO CHANGE
TO CHECK ON Q4&Q6 L: Q4&Q3&
PASS Vout = 9V
FAIL
R: Q5&Q6&
TO CHECK ON L1&L2
PASS
INPUT 9V TO L1 OR L2
TO CHANGE
FAIL L: Q7&Q8&C12&PT1
R: Q9&Q10&C13&PT2
FUNCTION TEST OK! PASS
27
SAMPO CORPORATION
TROUBLE SHOOTING OF CHI-MEI INVERTER ( DIVTL0037-D42- -)
9-2 HIGHT VOLTAGE PROTECTION:
1. SHORT R30 OPEN LOAD
TEST C14 INPUT POINT TO CHANGE ON
VOLTAGE Vh=1600 100V rms FAIL PT1 OR PT2
PASS FUNCTION TEST OK!
9-3 OUTPUT CURRENT ABNORMALITY:
1 CHECK ON C6 FREQUNCY FAIL
&CHIP&IC CPIP TO CHANGE ON C6
2 OSCILLATOR FREQUNCY CHIP OR IC CHIP
RANGE = 100 ~ 250 KHZ
PASS FUNCTION TEST OK!
28
SAMPO CORPORATION
TROUBLE SHOOTING OF CHI-MEI INVERTER ( DIVTL0037-D42- -)
9-4. ENBALE ABNORMALITY:
IF ENBALE ABNORMALITY
1. TO CHECK IC PIN 9 TURN NO FAIL TO CHANGE ON Q1&Q2
HAVE 12 VOLTAGES
FUNCTION TEST OK!
PASS
9-5 DIMMING CONTROL ABNORMALITY:
IF DIMMING ABNORMALITY TO FAIL
CHECK R1&R2&C6 HAVR BREAK TO CHANGE ON R1 OR R2 OR
C6&R33
PASS
FUNCTION TEST OK!
29
-9-
SAMPO CORPORATION
TROUBLE SHOOTING OF CHI-MEI INVERTER ( DIVTL0037-D42- -)
9-6 TRANSFORMER ABNORMALITY:
IF TRANSFORMER ABNORMALITY TO FAIL
CHECK C3&C4 CHIP OUTLINE OR TO CHANGE ON C3&C4
TRANSFORMER OR TRANSFORMER
PASS
FUNCTION TEST OK!
10. INSTRUMENTS FOR TEST:
1. DC POWER SUPPLY GPS-3030D
2. AC VTVM VT:-181E
3. DIGITAL MULTIMERTER MODEL-34401
4. HIGHTVOLT PROB MODEL-1137A
5.SCOPE MODEL-V-6545
6. AC mA METER MODEL-2016 (YOKOGAWA)
30
6 C). ADAPTER-MODULE Trouble shooting chart
The following spec & block-diagram is offer by CHI-SAM COMPANY, for External Adapter
part number : 80AL17-1-CH ( Black), 80AL17-2-CH ( White)
CHECK U101 PIN4
FREQ. (50~70KHZ)
31
I.) Adapter Schematic CH-1205
Please see the ADAPTER-SCHEMATIC in the end of this Document ( page 75)
32
IV. ADAPTER BOM LIST ( PART no. 80AL15-2-LI)
33
34
35
6 D). AUDIO-MODULE Trouble shooting chart
I.) NO VOICE OUTPUT
Plug-out the DC power , make sure
the monitor is in OFF status .
NG
Use OHM-METER measure U1 pin 2, 4 Check J1,J2 is well connected?
(channel-A ) is speaker well connected? Measured J2 pin 4,5 & 2,3 is
Measure U1 pin 10,12 ( channel B) is speaker well connected ?
well connected ?
YES
] YES
Check is speaker open circuit ?
Plug-in the DC power, set the monitor
ON status .
NG
Check R10,R11 & J5, S1 is open
Check U1 pin 1 = VCC 12V circuit?
YES
Check U1 is work properly?
NG
Check U1 pin 5 standby-bias
voltage around 4 V ?
Check R4 is open circuit?
YES
NG
Check U1 pin 9 volume-bias Check R7 , VR1
around 1 V ?
YES
Check Audio cable and J4 is well connected
36
II.) SOUND DISTORTION
NG