Tatung VL5A9DA Schematic

SER VICE MANUAL

LCD Monitor

VL5A9DA

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. Hannstar-inverter spec & trouble shooting chart

23
II. LG-inverter spec & trouble shooting chart 32
III. CPT-inverter spec & trouble shooting chart 41

C). ADAPTER – MODULE TROUBLE SHOOTING CHART & BOM....... 50

D). Main-chip GMZAN1 specifications

54

7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...................................... 80

8. PARTS LISTING .........................................................................................………... 81

9. POWER SYSTEM AND CONSUMPTION CURRENT............................................ 86

9-1 HARDWARE BLOCK DIAGRAM ………………………………………… 87

10. PCB LAYOUT .....................................................................………………………... 88

11. SCHEMATIC DIAGRAM …..................................................................................... 89

1. SPECIFICATIONS FOR LCD MONITOR

1-1 General specifications

1. LCD-PANEL :
Active display area 15 inches or 15.1 inches diagonal

Pixel pitch 0.298 mm x 0.298 mm or 0.3 mm x0.3mm
Pixel format 1024 x 768 RGB vertical stripe arrangement

2. Display Color :
6-bit, 262144 colors or 8-bit, 16.7 million colors

•

External Controls :

3.
a).Power On/Off, Auto key, Ro tary-knob ( for shuttle)
b).Power On/Off, Auto key, Left key, Right key ( for 4-key )

•

OSD menu Controls
Contrast, Brightness, Focus, Clo ck,H-position, V-position, Language, Recall-7800, Recall-6500, Reset,
Exit-osd, Red, Green, Blue

4. Input Video Signal :
Analog-signal 0.7Vpp

Video signal termination impedance 75 OHM

5. Scanning Frequencies :
Horizontal: 29 KHz - 61 KHz
Vertical: 55 Hz – 75 Hz
Pixel clock: 80 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 Temperatur e : -20• - 60•

9. Humidity :

Operating : 20% to 80% RH (non-condensing)
Non Operating : 5% to 95%RH (38.7• maximu m wet bulb temperat ure)

10. Weight :

4.5 kg

11. External Connection : 15Pin D-type Connector, AC power-Cord

12. View Angle : x-axis right/left = 60, y-axis up/down = 45 ,40

13. Outside dimension : Width x Height x Thickness = 398mm x 401mm x 250mm

14. Plug and Play : VESA DDC1/DDC2B

15. Power saving : VESA DPMS

±1 Hz

AC-IN
100v-240v

1-2 LCD MONITOR DESCRIPTION

The LCD MONITOR will contain an main board, an Inverter module, Adapter module and a keyboard. The
main board will house the fla t panel control lo gic, brightness co ntrol logic, DDC a nd DC-DC conversio n to
supply the appropriate power to the whole board and LCD panel.

The Inverter module will drive the backlight of panel .
The Adapter module will provides the 12V DC-power 3.5 Amp to Main-board and Inverter module .

Monitor Block Diagram

Inverter

CCFT Drive.

Flat Panel and
CCFL backlight

Main Board or Interface Board

ADAPTER

Keyboard

HOST Computer

Video signal, DDC

1-3 Interface Connectors

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

RS232 Connector
For white balance
adjustment in
factory mode

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 p ay 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•)

•-40•

3. OPERATING INSTRUCTIONS

This procedure gives you instructions for installing and using the LM500 LCD monitor display.

1. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three­wire 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 lo ck 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 po wer saving f unction follo wing the VES A DPMS. B e sure to connect the signal cable
to the PC.

6. If your LM500 LCD mo nitor requires service, it must be returned with the power cord.

1

6

11 15

5

10

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, clo ck, 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 4 to 6500

and 6500 parameter is x = 313 ±10, y = 329 ±10, Y = 135 ±5 cd/m

How to setting MEM.channel you can reference to chroma 7120 user guide or simple use “ SC” key and

NEXT

“

.

MEM. Channel 3 to 7800

color, ( our 7800 parameter is x = 296 ±10, y = 311 ±10, Y = 135 ±5cd/m2

” key to modify xyY value and use “ID” key to modify the TEXT description

2

)

Following is the procedure to do white-balance adjust

Press MENU button during 2 seconds along with plug in the AC-power cord will activate the factory
mode, and the OSD screen will located at

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

3. adjust the
value Y=210 cd/m

II. Gain adjustment :

a. adjust 7800 color-temperature

4. Set the Contrast of OSD function to 15, Brightness to –10

5. Switch the chroma-7120 to

6. switch the MEM.channel to Channel 03 ( with up or down arrow on chroma 7120 )

7. The lcd-indicator on chroma 7120 will show x = 296
cd/m

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 under the tolence
=100±2

VR501 on

2

left top of panel

INTERFACE board until chroma 7120 measurement reach the

2

±5 cd/m2

RGB-mode

.

maximal

(with press “MODE” button )

value , RGB to “50”

±10

, y = 311

±10

, Y = 135 ±5

color and

2

xyY mod

e With press “MODE” button

12. switch the chroma-7120 to

13. Adjust the Contrast on OSD window until the Y measurement on chroma 7120 reached
the value Y= 155 cd/m

14. Press 78 on OSD window to save the adjustment result

b. adjust 6500 color-temperature

1 Set the Contrast of OSD function to 15, Brightness to –10
2 Switch the chroma-7120 to

RGB-mode

(with press “MODE” button )
3 switch the MEM.channel to Channel 04 ( with up or down arrow on chroma 7120 )
4 The lcd-indicator on chroma 7120 will show x = 313

cd/m

2

±10

, y = 329

±10

, Y = 135 ±5

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 under the tolence

=100±2

2

xyY mod

e With press “MODE” button

9 switch the chroma-7120 to
10 Adjust the Contrast on OSD window until the Y measurement on chroma 7120 reached

the value Y= 155 cd/m

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-shadow as wid e 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 can see the horizontal interference at
screen only at crosstalk pattern and dot pattern we can find this phenomena, other pattern the affect is very
light

4. H/V-Position adjustment
Set the Chroma at 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 select ion, press “MENU” to selected and confirm , press “ LEFT” or “ RIGHT”
to change the kind of language ( English , Deut ch , 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 opera tor 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 , not 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 AC power cord will be in factory mode, and the
OSD screen will located at
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 fro m 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

left top of panel but take cautions

don’t press icon “78” & “65”, if you

5. CIRCUIT-DESCRIPTION

5-1 THE DIFFERENT between LG-Panel & Samsung-Panel & CPT-Panel & Hannstar- Panel in

ELECTRICAL Charateristic

LG-Panel

2. Single Pixel, 6 bit color (262144 colors)

3. Panel Vdd = 3.3V (in JP202 select 3.3V)

Samsung-Panel

2. Double Pixel, 6 bit color (262144 colors)

3. Panel Vdd = 5V (in JP201 select 5V)

Chung-Hwa Panel

2. Double Pixel, 8 bit color (16.7 Million colors)

3. Panel Vdd = 5V (in JP201 select 5V)

Hannstar Panel

2. Double Pixel, 6 bit color (262144 colors)

3. Panel Vdd = 3.3V (in JP202 select 3.3V)

5-2 SPECIAL FUNCTION with PRESS-KEY

A)

B)

. Press

OSD-INDEX EXPLANATION

1.

2.

3.

5-3 THE OPTIONAL on MAINBOARD for using SHUTTLE interface or KEYB OARD ( 4-KEY) interface.

The RESISTOR
for choosing KEYBOARD interface or SHUTTLE interface

1). for KEYBOARD interface ( 4-key) , the R319 = 0 ohm resistor

2). For SHUTTLE interface , the R319 = OPEN

5-4 THE OPTION on MAINBOARD or other ACCESSORY when using different PANEL type

1). The MCU software should be change

2). the PANEL power should be switch ( JP202 is supply 3.3V, JP201 is supply 5V)

1. Two CCFL (Cold Cathode Fluorescent Tube)

1. Four CCFL (Cold Cathode Fluorescent Tube)

1. Two CCFL (Cold Cathode Flourescent Tube)

1. Two CCFL (Cold Cathode Flourescent Tube)

. press

Menu

button during 2 seconds along with
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-mod e .

both Left & Right button along with Power button

function, repeat this procedure will disable OSD-LOCK
In OSD-LOCK function, all OSD function will be lock , except Contrast and Brighness

CABLE NOT CONNECTED

INPUT NOT SUPPORT

a. INPUT frequency out of range: H > 62kHz, v > 75Hz or H < 28kHz, v < 55Hz
b. INPUT frequency out of VESA-spec. (out of tolerance too far)

UNSUPPORT mode, try different Video-card Setting

Input frequency out of tolerance, but still ca n catch-up by our system (if this message show, that means, this
is new-user mode, AUTO-CONFIG will disable)

R319 ( 0 ohm

example : for HANNSTAR panel , the MCU part-number is 56A-1125-61-H

for LG panel , the MCU part-number is 56A-1125-61-L

for CPT panel , the MCU part-number is 56A-1125-61-C

example : for HANNSTAR panel, the jumper on Mainboard JP202 = 0 ohm, JP201 = OPEN

for LG panel, JP202=0 ohm, JP201 = OPEN

for CPT panel, JP202=OPEN , JP201 = 0 ohm

: Signal-cable not connected.

:

) which placement between Regulator LM2596 and MCU will be the controller

plug-in the AC Power cord

off to on once will activate the OSD-LOCK

:

:

and the other ACCESSORY when use different panel type should be change as following:

1). The INVERTER module for HANNSTAR panel part-number is 79AL15-6-S
for LG panel the INVERTER part number is 79A-L15-1-S
for CPT panel the INVERTER part number is 79A-L15-2-S

2). The FPC cable for HANNSTAR panel part number is
for LG panel the FPC part number is
for CPT panel the FPC part number is

3). The

MAIN-FRAME
FRONT BEZEL
FPC SHIELD
Front Inverter Shield
Panel Shield ( for EMI)

Adding following Mechanical accessory will

1. BASE-PLATE 15A5676-1

2. EARTH SPRING 19A550-2

3. EARTH CLIP 85A562-1

5-5 SIMPLE-INTRODUCTION about LM500 chipset

1. GMZAN1 ( all-in-one chip solution for ADC, OSD, scalar and interpolation) :

2. M6759 (ALI- MCU, type 8052 series with 64k Rom-size and 512 byte ram) :

3. 24LC21 (MicroChip IC) :

4. 24C04 (ATMEL IC) :

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)

MODULE-TPYE COMPONENT :

1. ADAPTER : CONVERSION-module to convert AC 110V-240V to 12VDC, with 3.5 AMP

2. INVERTER : CONVERSION-module to convert DC 12V to High-Voltage around 1600V, with frequency

Mechanical accessory

following differ ent is for TCO9 2 only

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.

Use for calculate frequency, pixel-dot , detect change mode, rs232-communication, power-consumption
control, O S D-index warning , …etc.

EePROM type, 1K ROM-SIZE, for saving DDC-CONTENT.

EePROM type, 4K ROM-SIZE, for saving AUTO-config data, White-balance data, and Power-key status
and Backlight-counter data.

30K-50Khz, 7mA-9Ma

is change or adding as follow;

LG PANEL LM151X2 CPT PANEL HANNSTAR PANEL

15A5679-3 15A5675-2 15A5683-2
34A679-1-AL 34A798-1-AL 34A798-1-AL
85A556-1 85A560-1 NONE
85A558-1 85A561-1 85A580-1
NONE NONE 85A581-1

UPGRADE

your monitor to

TCO99

5-6 SOFTWARE FLOW CHART

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)

Clear factory mode flag

Initial 1.POC (backlight counter)

2. Clr all mode value

Check Keyboard interface (if PORT P2.7 =High 5V denoted Shuttle
interface, otherwise is 4-key interface)

MAIN-SUBROTINE LOOP

Yes

SET factory mode flag

No

been c

No

No

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

Check Auto-config mode flag already been set?

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

Yes, IFM have change

Is current system status in Po wer-sa vi ng ?

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)

Read Key status and Process on OSD-screen

Yes

Check Factory mode flag= 1

)

Yes

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

Set mode index & parameter
Set change mode flag

Yes , freq had

hange

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

.

n

NG, led

NG,

NG, s

N

NG

*Use the PC Win 98/95 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

OK, led in green-state
But still no screen

NG, led in orange

If LED in ORANGE-state, that means your PC or
CHROMA was in Power-saving status or the resolution
had over-range too far ( or the resolution of PC
is in interlace mode, or over 1280x1024 @75Hz )
so please fix the resoluti on to our spec.( you can check
the freq with CRT monitor, or install our LM500 driver disk

OK, still no screen
But led is in Green

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

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

Check Panel type, was it match with the JP201 or JP202
definition? Measured the R225 with turn on & turn off the
power button, check R225 should have response from 12V
To 0V or vice versa

Check the FPC cable from CN201,CN202
was tight enough?, check the FPC of
panel side too

Measured TCLK(pin 141 from U200)
PVS,PHS (pin 73,74 from U200)
Is there has any transition?
Tclk around 31.25MHZ ,PVS=60.09Hz ,
PHS around 50.4KHz ??(for input
signal=31K 60 Hz, and LED is green)

Re-plug in AC-power cord & make sure LED
was in green-state? If led is in off-state(dark),
press POWER-button to turn-on the monitor

till no screen

Yes, but still no screen

in dark state.

still in led Orange

Check INVERTER-module

G

Check the Pbias relative circuit, R314, Q303, Q304, R315, R225..
In normal operation, when LED =green, R314 Pbias should =3.3v,
If Pbias no-response when the power switch turn on-off, replace
the GMZAN1

If LED in DARK-state, check the key­Button ,it could be stuck by mechanical

,especially the POWER-butto

Keyboard circuit

Check

and check

Mechanical key button, why be stuck?

Check GMZAN1-BLOCK

White-balance

RE-do
(see 4-2)

adjust

Check the PPWR panel power relative circuit,
R400,Q250, Q200,Q201,R225
In normal operation, when LED =green, R400
should =3.3v,
R225=12V,R226=5V (for CPT),or =3.3v for
LG,HANNSTAR
If PPWR no-response when the power button
Turn on- turn off, replace the GMZAN1

RE-assemble the FPC cable for both side
(Cn201,202 & panel-side)

GMZAN1 BLOCK

Check

O

NG , no

n

No

es,

es,

Measured PCLK(pin 44 from CN201)
PVS,PHS (pin 40,38 from CN201)
Is there have any transition?
Pclk around 31.25MHZ ,PVS=60.09Hz ,
PHS around 50.4KHz ??(for input
signal=31K 60 Hz, and LED is green)

Change PANEL to new one

K

II THE SCREEN is Abnormal , stuck at white screen, OSD window can’t appear, but
keyboard & LED was normal operation.

Check the PCLK at CN201 pin 44 ( or L201) , PVS at CN201 pin 40, PHS at
CN201 pin 38, Pdispe at CN201 pin 42, is there have any transition?
Pclk around 31.25MHZ ,PVS=60.09Hz , PHS around 50.4KHz ??(for input
signal=31K 60 Hz, and LED is green)

Y

have transition

Check RGB data from bead-array (PD14-1•PD42-1)
At CN201 ,Is there have any transition ?

Y

have transition

Check panel power (R226) have DC voltage?
R226 ( Panel_P) =5V fro CPT,and 3.3V for
others panel
The maintainers must make sure the Power button
state is ON , ( check the LED should be green
state)

NO voltage

Check PERIPHERALS PANEL
BLOCK

transition

Check the bead-array & cap array(LP201•LP212
,CP201•CP212 was cold solder or bad)

White-balance

RE-do
(see 4-2)

adjust

transition

Check the bead-array & cap array(LP201•LP212
,CP201•CP212 was cold solder or bad)

Check all pin on GMZAN1 ( U200) for
cold-solder ?

Measured TCLK(pin 141 from U200),PVS, PHS (pin
73,74 from U200) Is there has any transition?
Tclk around 31.25MHZ ,PVS=60.09Hz , PHS around

50.4KHz ??(for input signal=31K 60 Hz, and LED is
green)
And check Gmzan1 RGB output ( PD14• PD42) have a
transition?

Check GMZAN1 BLOCK

O

NG

O

GMZAN1 BLOCK check
Note : set the input signal ( PC or CHROMA) to 640x480 31k 60 hz

Check input connector CN200 is loose??
Measure R212,R211= 31K & 60 hz ?
Measure R200,R201,R202 (RGB input )
had signal??

K

NG

Tighten CN200 cable & check relative circuit

NG

Screen is normal ?

Measure U201 oscillator 50MHz is normal??
(you can measure R215)

NG

Replace

U201 oscillator 50 MHz

Set chroma or PC to power-save mode
Check LED in ORANGE state ?

Set chroma or PC to 640x480 @60Hz or
Other frequency, check LE D in GREEN
State?

Measured PCLK(pin 44 from CN201)
PVS,PHS (pin 40,38 from CN201)
Is there has any transition?
Pclk around 31.25MHZ , PVS=60.09Hz , PHS around

50.4KHz ? (for input signal=31K 60 Hz)

Re-plug AC power-cord, and check again
Previous function, if still no screen, then
Replace

GMZAN1

K

OK, partial of Gmzan1 is good

chip

NG

Replace

GMZAN1

Check

END

Peripheral-panel block

PERIPHERAL PANEL BLOCK

NG

,

O

Note: “Panel vdd “ and “backlight on-off ” can be direct control by :

GMZAN1 or MCU
Some panel can direct control by GMZAN1 ,if the relative timing between panel-vdd and backlight on-off
is short ( under 80 ms) , otherwise, will be control by MCU
If J211 be connected, that means Panel-VDD control was by GMZAN1 ,otherwise by MCU( JP212)
If J300 be connected, that means Backlight control was by GMZAN1 ,otherwise by MCU ( JP301)

BUT Hannstar panel & CPT panel still control by J211 & J300

Press on-off ke y once, make-sure Led is in
Green state .check panel-VDD = 3.3V for
HANNSTAR
And 5V for CPT-panel , measured Panel-p
(pin 4,5 from CN201)??

Check CN303 pin 3 = 5 V ? ( that is
Backlight controller, On-state= 5V)

Check CN303 pin 4•4.6V ??(that VR is for
Backlight luminance control)

FOR HANNSTAR-PANEL , there is the relative timing between input resolution to output timing for panel
( output timing from GMZAN1 chip) as follow :

RESOLUTION( from PC or chroma) PCLK(U200.44) PHS ( U200.74) PVS (U200.73)
640X480 @60 Hz 31.25MHz 50.4 KHz 60.09 Hz
640X480 @70 Hz 35.56MHz 55.93KHz 69.83 Hz
640X480 @72 Hz 36.76MHz 57.64KHz 71.94 Hz
640X480 @75 Hz 37.71MHz 60.12KHz 74.96 Hz
800X600 @60 Hz 28.65MHz 48.45KHz 60.39 Hz
800X600 @70 Hz 32.94MHz 56.05KHz 70.03 Hz
800X600 @72 Hz 34.25MHz 57.61KHz 72.04 Hz
800X600 @75 Hz 35.71MHz 60.10KHz 75.08 Hz
1024x768@60 Hz 28.57MHz 48.36KHz 60.09 Hz
1024x768@70 Hz 32.77MHz 56.05KHz 70.03 Hz
1024x768 @72 Hz 33.97MHz 57.60KHz 71.84 Hz
1024x768@75 Hz 5.41MHz 60.24KHz 74.96 Hz

TURN VR until CN303

Pin 4= 4.7 V??

NG, still no
screen

If JP211 was connected, check PPWR relative circuit
( R400,R401,Q250,R223,Q200,R224,R225,C245,Q201
cold-solder or open loop)?? make-sure LED in
Green-state, and PPWR (U200.pin 76)= high 3.3V
If JP212 was connected, check Backlight_En relative circuit
(R223,Q200,R224,R225,Q201,C245), make sure
Backlight_E n = low 0V ??

K

If JP300 was connected ,check Pbias relative circuit( R314,R309,R315
Q303,Q304,R311 cold-solder or open loop)?? make-sure LED in
Green-state, and Pbias (U200.pin 75)= high 3.3V
If JP301 was connected, check Panel-en relative circuit( R315,Q304
R311 cold-solder or open loop ??) make-sure LED in green-state
And Panel-en= low 0V ??

If JP300 was connect, replace GMZAN1
Chip, if JP301 was connect , replace MCU

OK

Replace PANEL, maybe the lamp or
Driver board was bad

O

O

NG

NG

,

O

OK, no keep

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

K

NG, MCU no response

transition

NG

Keep transition, that means eeprom no response

Mechanical was stuck, Check !

Replace
no work replace U302 MCU at main-board and
check MCU relative reset circuit, and crystal

K

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

Tact-switch SW105

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

Check JP202 is
connect ?

at keyboard if still

Check U300 pin 8
(vdd)= 5V, and check
R300

Replace eeprom

R301 cold solder

K

POWER-BLOCK check

O

O

p

*

*Note : the waving of U304 pin 2 can determined the power situation

1. stable rectangle wave with equal duty, freq around 150K-158KHz
that means all power of this interface board is in normal operation
,all status of 5V & 3.3V is normal working

2. unstable rectangle wave without same duty, that means ABNORMAL operation was happened
check 3.3V or 5V ,short-circuit or bad component

3. rectangle wave with large spike & harmonic pulse on front side of rectangle wave, that means all 3.3v is
no load,

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

Gmzan1

was shut-down, and only

K

K

MCU

still working ,the monitor is in power saving state

NG

ADAPTER

Check

NG

Check U304 pin 2 is a unstable rectangle wave ?

OK, unstable wave

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

and connector if

The interface board is in power­saving state, pre ss power key to wake
up & check your signal input

loose?

NG, with
harmonic

ulse

O

III.ALL SCREEN HAS INTERFERENCES OR NOISE, CAN’T BE FIXED BY AUTO KEY

** NOTE:

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 1024x768 @ 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 ne w AGP-VGA-CARD such situation
always happened
So in your

advance ,screen-adjust,at
Size icon,

key every step you increase the
procedure( increase/decrease SIZE one-step and press
AUTO) until the interferences disappear, press “APPLY”
to save in your VGA

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)

Yes, has extension

NO additional extension

Yes, only happened on one

control-panel

increase step by step slowly, press “”AUTO”

icon ,select

monitor ,setting ,

SIZE .

repeat the

cable

K

END

END

Put away the additional cable
May be the additional cable grounding is
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)

DOS MODE has jitter

p

e

f

es No

N

NOTE :the rule of doing AUTO-CONFIGURATION : must be a full-size screen, if the screen not full , the auto­configuration will fail. So in do s mode ,just set your “CLOCK” i n OSD-MENU to zero or use some full screen edit
file (ex: PE2, HE) and press “AUTO”

. THERE WAS SNOW PHENOMENA or BRIGHT NOISE ON THE SCREEN

I•

When use pattern 32 Gray-scale / or 16 Gray scale, there is a
inside) that means some output bit to panel was bad, may be cause by FPC loose, or bead-array cold-solder
There were some panel (ex :LG),also have this phenomena too, the noise will reduce or increase depend on the
contrast/brightness value, this kind of proble m was cause b y P anel-driver-boa rd it sel f, we can’t fix it ,the o nly wa y to
do was find the best-point of brightness/contrast, that the noise is more light

Use following pattern :

1. pure-white 2. Pure Red 3. Pure Green

4. Pure Blue 5. Pure White 6. Character
repeat measure GMZAN1 (U200) all output pins must have some transition pulse, but notice

1. For LG panel and HANNSTAR panel , only 6 bit has output, (PD0~ PD17 , PD36 ~ PD41) the
corresponding beads was LP201 ~ LP206

2.

For Chung-hwa panel or other’s 8 bit panel, all output are available (PD0-PD47 ), the corresponding beads
was LP201-LP212

snow phenomena on the screen (like a noise spread

Ex : HANNSTAR Panel 6 bits

With 16 gray-scale, adjust contrast /brightness slowly

and observe the noise was increase or reduce or no-

influence at all ?especially at low luminance scale

No-

That was the panel noise, no solution,
Just set the brightness to the best point

which noise is more light

Set pattern to full-white, adjust contrast to 50

Check U200 GMZAN1
Pin 71,70,69,68,67,66 ( Red, Pd0 -Pd5)
Pin 64,63,62,57,56,55 (Green ,Pd6-Pd11)
Pin 54,53,52,51,50,48 (Blue, Pd12- Pd17)
There must be have some transition pulse in

each

in

Some pins no transition

Set pattern to Pure-Red or Pure Green or Pur
Blue repeat above-step until all pins had
transition

All pins has transition

Denotes U200 GMZAN1 work well

Check bead-array LP201~LP206, both side o
bead must have the same transition signal

o

All 5 pattern already change yet? ?

Check FPC cable for
loose, or FPC bad, if
FPC bad, replace it

Y

Replace the
correpondens beads
array and check the
capacitor arrays too

If all pattern already change but still had some pins no
transition. That means GMZAN1 (U200) fail, replace
U200

V. THE PANEL LUMINANCE WAS DOWN

NG

Use white pattern and resolution 1024x768 @ 60Hz , CHROMA 7120 measured the center of panel

Set Contrast, brightness =maximal, RGB= 50
Quit from OSD-screen, measured Y(luminance)
With chroma 7120, check Y= 210±10 CD/M2 ?

Adjust VR201 until maximal, measured Y =
210±10 cd/m2 ?

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

If Y can reach •180 cd/m2 that means
The lamp still working well, so we just re-do the
white-balance process
As following procedure

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,

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

Inverter –MODULE Spec &Trouble Shooting Chart

6 B).

In LM500 model , we use 3 kind of panel, each panel have their own inverter spec,therefore

following spec is Hannstar-panel Inverter, LG-panel Inverter,CPT-panel Inverter offer from

SAMPO-CORPORATION

I.) TROUBLE SHOOTING OF HANNSTAR-INVERTER (part no : 79AL15-6-S)

TYPE: L0048 FOR HANNSTAR 15”PANEL

SAMPO CORPORATION

T R O U B L E S H O O T I N G O F H ANN S T AR- IN V E R T E R ( DIVTL0048-D21- -)

1.SAMPO PART NO .:

2.SCOPE :

HANNSTAR(HSD150MX41) 15

this is to specify the requirements of the subject parts used in

L0048 ,AOC PART NO.: 79AL15-6-S

inch (2 C.C.F.L.) LCD monitor.

3.CONNECTOR PIN ASSIGMENT:

4-1. CON1: INPUT

MODEL NO.: S5B-PH-SM3-TB

PIN SYMBOL DESCRIPTION

1 Vin Input voltage: 12V
2 GND GND
3 ON/OFF ON: 3V OFF:0V
4 Dimming Dimming range (0V~+5.0V)

5 Dimming Dimming range (0V~+5.0V)

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 RETURN Return to c ont rol

2

2

SAMPO CORPORATION

T R O U B L E S H O O T I N G O F H ANN S T AR- IN V E R T E R ( DIVTL0048-D21- -)

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 -- 800 1300 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

Vopen

Vload

FUNCTION LOAD CIRCUIT:

6.

10.8 12 13.2 V

1.7

5.8

2.2

6.2

2.7

6.7

mA

mA

50 60 KHZ

1250 1400 1550 Vrms

580 680 780 Vrms

FOR 1 CCFL
LOAD:110K•

FOR 1 CCFL
LOAD:100K•

NO LOAD
RL=110K•

10•

CON1

1 2 3 4 5

1

110K•

VT

1

10•

PIN SYMBOL

110K•

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

VT

DDD

SSS

GD

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

3. R1 RESISTOR VRMHNVA--303J-A 1 SMD 0603 30K• 5% YAGEO

4. R2

5. R3

•

•

•

VCNCP0012-ZJSTA

VCNCP0012-ZGLEA 2 2

VRMHNVA--512J-A 1 SMD 0603 5.1K• 5% YAGEO

VRMHNVA--272J-A 1 SMD 0603 2.7K• 5% YAGEO

SM02(8.0)B.BHS-1-TB

GL SM02(8.0)-WH2

JST

GEAN-LEA

6. R4

7. R5

8. R6,10

9. R8

10. R9

11. R11

12. R12

13. R13

14. R14

15. R15,16

16. R17,18

17. Q1 TRANSIST0R VSTDTC144WKA--A 1 SMD DTC144WKA ROHM

18. Q2

19. Q3

20. Q4

21. Q5,6
Q7 TRANSIST0R VSTDTC143EKA--A 1 SMD DTC143EKA ROHM

22. C1 CAPACITOR VCEATU1EC336M--

23. C6

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

•

VRMHNVA--222J-A 1 SMD 0603 2.2K• 5% YAGEO
VRMHNVA--563J-A 1 SMD 0603 56K• 5% YAGEO

VRMHNVA--R00J-A 2 SMD 0603 0• 5% YAGEO

VRMHNVA--683J-A 1 SMD 0603 68K• 5% YAGEO
VRMHNVA--333J-A 1 SMD 0603 33K• 5% YAGEO
VRMHNVA--271J-A 1 SMD 0603 270• 5% YAGEO
VRMHNVA--103J-A 1 SMD 0603 10K• 5% YAGEO
VRMHNVA--472J-A 1 SMD 0603 4.7K• 5% YAGEO
VRMHNVA--363J-A 1 SMD 0603 36K• 5% YAGEO
VRMHNV4--122F-A 2 SMD 1206 1.2K• 1% YAGEO
VRMCNV8--102F-A 2 SMD 0805 1K• 1% YAGEO

VSTDTA144WKA--A 1 SMD DTA144WKA ROHM

VSTSST3904----A
VSTMMBT3904-A

VSTCEM9435A-----A

VSTSI9435DY---A

VST2SD2150----A 2 SMD 2SD2150 ROHM

VCEATU1VC476M-­VCEBCU1EC107M--

VCLRCN1EB104K-A 1 SMD 0805 0.1 µF/25V TDK

1 SMD SST3904T116

SMD MMBT3904

1 SMD CEM9435A

SMD SI9435DY

1

DIP UGX 33 µF/25V

1

DIP UGX 47µF/35V

1

DIP NK-CON 100µF/25V

ROHM

MOTOROLA

CEM

VISHAY

SANYO
SANYO

NK-CON

8-2 COMPONENTS LIST:

NO. REF. PART

24. C2,3,5,8,12 CAPACITOR VCLFCN1EY105Z-A 5 SMD 0805 1µF/25V TDK

NAME

PART NUMBER QTY DESCRIPTION SUPPLIER REMARK

25. C4

26. C7

27. C9

28. C10,11

29. C13

30. D1 DIODE VSDRLS4148----A

31. D2

32. D3

33. D4

34. I.C I.C VSITL5001CDR--A 1 SMDTL5001CDR TEXAS

35. F1 FUSE QFS-N152FIDZD-A

36. L1 COIL RCHOL0007ID151A 1 DIP 150µH 8% YST Attachment 1

37. PT1 TRANS RCVT-1508ID-Z-A 1 SMD YST-1508 YST Attachment 2

38. PCB PCB QPWBGL986IDLE2- 1 QPWBGL986IDLE2- LONGMAW

•

•

•

•

•

•

•

•

VCLRCN1HB103K-A 1 SMD 0805 0.01

µF/50V

VCLFCN1CY225Z-A 1 SMD 0805 2.2 µF/16V TDK

VCMECF2AC184J-P

VCMEBF2AB184J-P

VCMPH2AG184J--

VCDSEU3SL220K-- 2 DIP 22PF/3KV 10% TDK

VCLFBN1CY475Z-A 1 SMD 1206 4.7 µF/16V TDK

VSDLL4148-----A

VSDRB160L40---A

VSDB140-------A
VSZRLZ9.1B-----A 1 SMD RLZ9.1B ROHM
VSDDA204K-----A

VSDBAV99-7----A

QFS-Z152FIDZD-A

1 DIP 0.18µF/100V

DIP 0.18µF/100V
DIP 0.18µF/100V

1 SMD RLS4148

SMD LL4148

1 SMD RB160L40

SMD B140

1 SMD DA204K

SMD BAV99-7

1 SMD FUSE 1.5A/63

SMD FUSE 1.5A/63

TDK

THOMSON

ARCO

TAIWAN

TAI

ROHM

VISHAY

ROHM

DIODES

ROHM

DIODES

LITTLE

BUSSMANN

Attachment
(FEC1Q2)