Tatung VL7A9DA, LM700 Schematic

SERVICE MANUAL

LCD Monitor

VL7A9DA

TABLE OF CONTENTS

PAGE

1. SPECIFICATIONS .................................................................................................... 3

1-1 GENERAL SPECIFICATIONS ...................................................….............. 3

1-2 LCD MONITOR

DESCRIPTION ..................................................................

1-3 INTERFACE

CONNECTOR .................................................................…….

2. PRECAUTION AND NOTICES ................................................................................ 5

2-1 ASSEMBLY

PRECAUTION .........................................................................

2-2 OPERATIONG

PRECAUTION .....................................................................

2-3 STORAGE

PRECAUTION …........................................................................

2-4 HIGH VOLTAGE

WARNING .......................................................................

3. OPERATING INSTRUCTIONS ................................................................................ 6

4. ADJUSTMENT .......................................................................................................... 7

4-1 ADJUSTMENT CONDITIONS AND

PRECAUTIONS ...............................

4-2 ADJUSTMENTS METHOD & DESCRIPTION......................... 7-8

4-3 FRONT PANEL CONTROL

KNOBS ............................................................

5. CIRCUIT & SOFTWARE DESCRIPTION ................ 10

5-1 THE DIFFERENT BETWEEN EACH PANEL ……………………………. 5-2 SPECIAL FUNCTION WITH PRESS KEY ……………………………….. 5-3 THE OPTIONAL ON MAINBOARD USING SHUTTLE & 4 KEY.. 10 5-4 THE OPTIONAL ON MAINBOARD OR OTHER ACCESSORY USING

DIFFERENT PANEL 5-5 SIMPLE INTRODUCTION ABOUT LM500 CHIPSET …………………... 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

4 4

10. PCB LAYOUT .....................................................................………………………... 74

11. MAINBOARD SCHEMATIC DIAGRAM …............................................... 75

12. ADAPTER SCHEMATIC DIAGRAM

13.AUDIO SCHEMATIC DIAGRAM

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 ±1 Hz

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

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 provides the 12V DC-power 5 Amp to Main-board and Inverter module.

Inverter

AC-IN 100v-240v

1-3 Interface Connectors

(A) AC-Power Cable (B) Video Signal Connectors and Cable (C) External Adapter

Main Board or Interface Board

ADAPTER

Monitor Block Diagram

CCFT Drive.

Keyboard

Flat Panel and CCFL backlight

HOST Computer

RS232 Connector For white balance adjustment in factory mode

Video signal, DDC

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-40

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)

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 plug–in 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:

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.

11 15

15 - Pin Color Display Signal Cable

PIN NO.

DESCRIPTION

4. ADJUSTMENT

4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS

Adjustments should be undertaken only on following function: contrast, brightness focus, clock, h-position, vposition, 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 Black level value on OSD should be large than 30, if less than 30 that means the offset calculation FAIL, please manual adjust the black level 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 ±5 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 ±10, y = 311 ±10 , Y = 160 ±5 cd/m2

8. Adjust the RED on OSD window until chroma 7120 indicator reached the value R=100

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±2

12. switch the chroma-7120 to xyY mod e 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 ±10 , y = 329 ±10, Y = 160 ±5

cd/m2 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

±2 9 switch the chroma-7120 to xyY mod e 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)

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 whitebalance 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

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

5-3 SIMPLE -INTRODUCTION about VL7A9DA 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

LVDS chip (U601,

Panel-Power Control MCU ( U302 )

Rs232 communication

Oscillator 50 mhz

Crystal 20 mhz

DDC-chip

PANEL

Keyboard module

EXTERNAL-

Input analog RGB & H,V,& ddc signal &

DC 12V

ADAPTER

Main-board Block diagram

GMZAN1 (U200)

Data Digital RGB

U602)

Panel Control Signal: Dhs, Dvs, Dclk

Panel Power 5V

Communication signal: Hclk,Hfs,Hdata0

(U202)

INVERTER module

5-4 SOFTWARE FLOW CHART

Yes

Clear factory mode flag

I. Power-On Subrotine CHART

POWER-ON START

Initial MCU I/O , Interrupt vector & Ram

Check Eeprom is empty ?

Check White-balance data(6500 & 7800) same with the backup data ? Check POC( backlight counter) data same with the backup data ?

IF not same, overwrite the data with backup value.

Check Previous power -switch status from Eeprom, & other system status

Check if in Factory mode?(when power -on,press the MENU Button will be in FACTORY mode)

MAIN-SUBROTINE LOOP

Initial 1.POC (backlight counter)

2. Clr all mode value

SET factory mode flag

II. MAIN SUBROTINE LOOP

Yes

Yes , freq had been change

Yes

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

)

Yes, IFM have change

Is current system status in Power -saving ?

Check the IFM result is in the standard Mode table ?

Check the IFM result is in the user mode table ?

Out of range ( input not support) be confirm

confirm the frequency ( Hsyn or Vsyn) from IFM already

been changed ? ( check the change mode flag)

Process ( turn off OSD , setting GMZAN1according to above parameter,set LED status, set backlight status)

Check Auto-config mode flag already been set?

Read Key status and Process on OSD-screen

Check Factory mode flag= 1

Monitoring the time-out of osd status ( if no key input persist for 10 sec , the osd time-out counter will trigger )

Wake-up GMZAN1 (because GMZAN1 was in partial sleeping state)

Set mode index & parameter Set change mode flag

Do Auto-config automatically

if the RS232 buffer is full, process the command( while adjust white-balance in factory mode)

6. A). Interface-Board Trouble-Shooting chart

Connected” ?

No, nothing is show

Yes, there have OSD show

Check the Wire-Harness from CN601,CN602

check the Wire connection to panel side too

OK,Wire tight enough

Led Green

Block

OK,Panel Power OK

Replace Inverter and Check

do White balance adjust

OK, U200 data OK

Check Power switch is in Power-on status , and check if Power switch had

Measured RGB (r200,r201,r202) H,V Input at U401 pin 9 ,4 ,was there have signal ?

Measured Oscillator Block

Check communication pin between U200 & Led Orange

U200 (Gmzan1)

OK, Keyboard no stuck

OK,input Normal

OK,clock normal

OK, Mcu have transition

Replace U302 (MCU)

must be change from High to

NG, no transition

Led orange

Replace MCU

Led Green

Yes, all DC level exist

Check Correspondent component.

Check Correspondent

( Protection Diode )

*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

Measured Input DC-voltage ( J1)= 12 V? Measured U305 AIC 1084 pin 2 = 3.3V? Measured U904 LT1117 pin 2= 3.3V?

Disconnected the Signal cable( Loose the Signal cable ),Is the screen show “Cable Not

Connected the Signal cable again, Check LED status.

was tight enough?,

Check Panel-Power Circuit

Check U200 Data-output Block

Inverter control relative circuit

Re-

Note: 1. if Replace “MAIN-BOARD” , Please re-do “DDC-content” programmed & “WHITE -Balance”.

2. if Replace “ INVERTER” only, Please re-do “ WHITE -Balance”

DC-Power Part

Is there any shortage or cold solder?

Connected the Signal cable again, Check LED status.

been stuck ?

component short/open

and Signal cable bad ?

Oscillator U201 & Crystal X300

MCU pin 2,6,7. , is it have transition?

& check Reset pin 10

Replace

low when first AC power plug in

PANEL-POWER CIRCUIT

h the power switch from on to off

Check the PPWR panel power relative circuit,

NG, no Voltage

Replace INVERTER-module

NG, still no screen

NG,no transition

OK, has transition

NG,no transition

NG , no transition

Check U202 pin 1,2,3,4= 5V

check R225 should have response from 12V to 0V When we switc

Measured the U202 pin 5,6,7,8= 5 V?

OK,R225 have response

INVERTER Control Relative Circuit

Measured the inveter connector CN303 Pin 1=12V, pin 3 on/off control=5V (on)

Replace INVERTER to new -one, and Check the screen is normal ??

OSCILLATOR BLOCK

Measured U201 Oscillator output R215= 50mhZ ?

Measured X300 Crystal output R340= 20mhZ ?

U200-DATA OUTPUT

Measured PCLK(L207) PVS,PHS (pin 73,74 from U200 ) Is there have any transition? Pclk around 47MHz to 57MHZ , PVS=60.09Hz , PHS around 67 KHz ??(refer to input signal=640x480@60 Hz 31k, and LED is green)

R223, Q200,U202(pin 5,6,7,8) In normal operation, when LED =green, R223 should =0 v, If PPWR no-response when the power switch

Turn on and turn off, replace the U200-GMZAN1

Replace U202 ( Nmos, SI9933)

Check U304 relative circuit.(R905,T300..)

Check the Bklt-On relative circuit, R315, Q304, R311, In normal operation, when LED =green, R315 Bklt-On should =0 v, If Bklt-On no-response when the power switch turn on-off, Replace the MCU

& Re-do white balance

Replace Oscillator U201

Replace Crystal X300

Replace GMZAN1 (U200) or replace MAINBOARD.

If MainBoard being replace , please do the DDC – content reprogrammed

II (a) THE SCREEN is Abnormal , stuck at white screen, OSD window can’t appear, but

Check U904,which convert the 5V to

Check U200 DATA-OUPUT block as

AC power -on

OK, reset is normal

NG,still no data out

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? Check the wire on both Panel -side and Mainboard side.

Tighten it.

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 the LVDS-Power L603,L604,L601,L602,L900= 3.3V ?

Yes, Voltage normal

3.3V

Check the both U601 & U602 LVDS-Input pin 31= 45mhz – 65mhz, and pin 27 = Vsyn freq, pin 28 = 45khz - 65 khz

Yes, Frequency normal

Replace both LVDS chip ( U601 & U602)

above ( page 15)

NG,no data output

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

Check U200 DATA-OUTPUT block again

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.

R300,R301 cold solder

OK, no keep transition

KEYBOARD BLOCK check

Check U302 MCU pin 43,42,41,40,39 at High state(5V)? without press any key

Press power key and check U302 pin 43 = low (0V) ?

Check U302 pin 38 (LED green) will have transition from hi to low or low to hi when we press the power key??

Check U302 pin 20= 20MHz ? and pin 44 (VDD)=5V ? and pin 10 (reset)=0V ? at normal condition

Without press key and change mode, Check U302 pin 16,17(sda,scl)= hi 5V ? or keep transition ?

Replace U302 MCU

NG, MCU no response

Mechanical was stuck, Check !

Replace Tact-switch SW105 at keyboard if still no work replace U302 MCU at main-board and check MCU relative reset circuit, and crystal

If still no Led green indicator, check Q102, R106 & LED at keyboard !! cold solder or bad

If one of this item was NG, check the relative circuit

Keep transition, that means eeprom no response

Check U300 eeprom 24LC04 relative circuit, check U300 pin 7 = low?

Check JP202 is connect ?

Check U300 pin 8 (vdd)= 5V, and check

Replace eeprom

POWER-BLOCK check

pulse

OK, unstable wave

saving state, press power key to wake

**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 .

Measure input power at U304 LM2596 pin 1= 12V ?

Check U304 pin 2 is a stable rectangle wave? Around 150k-158kHz stable rectangle wave with equal duty without any spike or harmonic pulse?

The interface board power is good

Check ADAPTER and connector if loose?

Check U304 pin 2 is a unstable rectangle wave ?

Check all 3.3V & 5V power, there is short circuit or bad component was happened

The interface board is in power -

up & check your signal input

NG, with harmonic

May be the additional cable grounding is

NG, interferences still exist

Yes, only happened on one mode

NO, all mode

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 interferences disappear ??

Adjust “FOCUS” step by step, until the horizontal interferences disappear

Does your signal -cable have an additional cable for extension ??

Does your noise only exist in one mode only? (ex: only at 1280x1024 @ 75 Hz, other is normal)

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

NO additional extension cable

Yes, has extension

END

Put away the additional cable

not quite well

Change the Signal -cable to new-one or Try other brand VGA-CARD (make sure just only that brand VGACARD has this problem ,contact RDtaipei)

There is an interferences in DOS MODE

Set Contrast, brightness =maximal, RGB= 50 Adjust VR201 until maximal, measured Y =

If the Y less than 160 cd/m2 (after the VR201= MAX, contrast, brightness = max) then change the

If Y can reach 190 cd/m2 that means

do the

press AUTO button to automatically adjust

Set contrast, brightness to max, and turn the VR201 to max , wait for 20 minutes until the luminance Y

NOTE :the criteria of doing AUTO-CONFIGURATION : must be a full -size screen, if the screen not full , the autoconfiguration 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

Quit from OSD-screen, measured Y(luminance) With chroma 7120, check Y= 240±10 CD/M2 ?

The lamp still working well, so we just rewhite-balance process

As following procedure

240±10 cd/m2 ?

Use white-pattern, press MENU button along with AC power -plug in ( you will in factory mode) The OSD-menu will be at left-top of screen,

LAMP of panel

blacklevel value, you will see the sign PASS ,if FAIL , manual adjust the blacklevel until value 43 !

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

6 B). Inverter –MODULE Spec &Trouble Shooting Chart

TYPE: L0037 FOR CHI-MEI 17”PANEL

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)

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

MODEL NO.: S5B-PH-SM3-TB

4-2. CON2,CON3 : OUTPUT MODEL NO. : SM04(4.0)B-BHS-1-TB

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

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

1 2 3 4 5

TV TV

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

Input current Iin -- 2200 2500 mA output current

Iout

adj:0v( min.)

(min)

Output current

Iout

adj.:5 v(max.)

(max)

Frequency H.V open

H.V Load

F 40 50 60 KHZ

Vopen

Vload

6. FUNCTION LOAD CIRCUIT:

10.8 12 13.2

2.1

5.5

2.6

6.0

3.1

6.5

1400 1500 1600 Vrms

630 730 830 Vrms

FOR 1 CCFL

LOAD:120KÙ

FOR 1 CCFL LOAD:120KÙ

NO LOAD RL=120KÙ

120KÙ

10Ù

1 2

4 2

CON1

120KÙ

10Ù

120KÙ

PIN SYMBOL

120KÙ

1 Vin 12V

10Ù 10Ù

2 Vin 12V 3 ON/OFF 4 Dimming 5 GND

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