Lenovo SPECTRUM Series User manual

SERVICE MANUAL
SPECTRUM Series
LCD Monitor
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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 : May-25. 2004
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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 .......................................................................................................... 7～8
5. CIRCUIT & SOFTWARE DESCRIPTION ................................................................ 8～13
6. TROUBLE SHOOTING............................................................................................. 14～22
7. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY........................................... 23
8. PARTS LISTING .........................................................................................………... 24～33
9. SCHEMATIC DIAGRAM …..................................................................................... 33～37
10 PCB LAYOUT .....................................................................………………………... 38～40
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1. SPECIFICATIONS FOR LCD MONITOR
1-1 General specifications
1. LCD-PANEL :
Active display area 15 inches or 15.1 inches diagonal
Pixel pitch 0.297 mm x 0.297 mm
Pixel format 1024 x 768 RGB vertical stripe arrangement
2. Display Color :
6-bit, 262144 colors or 8-bit, 16.7 million colors
3. ●External Controls :
a).Power On/Off, Auto key, Rotary-knob ( for shuttle)
b).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-C2(warm
color), Recall-C1 (Cool color), 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 - 63 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 ±1 Hz
7. Power Source :
Switching Mode Power Supply
AC 100 – 240 V, 50/60 Hz Universal Type
8. Operating Temperature : 5℃- 35℃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 : 3.0 kg
11.External Connection : 15Pin D-type Connector, AC power-Cord
12.View Angle : x-axis right/left = 60, y-axis up/down = 45 ,45
13.Outside dimension : Width x Height x Thickness = 356mm x 358mm x 160mm
14.Plug and Play : VESA DDC1/DDC2B
15.Power saving : VESA DPMS
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1-2 LCD MONITOR DESCRIPTION
The LCD MONITOR will contain an main board, an inverter/power board, keypad board
and internal adapter which house the flat panel control logic, brightness control logic and
DDC.
The power board will provide AC to DC Inverter voltage to drive the backlight of panel
and the main board chips each voltage.
1-3 Interface Connectors
(A) AC-Power Cable
(B) Video Signal Connectors and Cable
(C) Audio Cable
Power board
(include: adapter, inverter)
Flat Panel and
CCFL backlight
Main Board
Keyboard
RS232 Connector
For white balance
adjustment in factory
mode
HOST Computer
CCFL Drive.
AC-IN
100V-240V
Video signal, DDC
Monitor Block Diagram
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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 5℃-35 without the exposure of sunlight and to keep the humidity less than℃
80% 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℃)
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3. OPERATING INSTRUCTIONS
This procedure gives you instructions for installing and using the LM520 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:
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 LCD monitor requires service, it must be returned with the power cord &
Adapter.
1
6
11 15
5
10
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4. ADJUSTMENT
1024x768 48K 5 9 H z
亮 度 和 对 比 度
位 置 调 整
视 频 杂 讯
语 言 选 择
O S D 显 示 时 间
色 温 调 整
O S D 位 置
退 出 菜 单
恢 复 出 厂 模 式
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5. CIRCUIT-DESCRIPTION
5-1 PANEL SPECIFICATION (LG X08)
5-1-1Panel Feature
－15” XGA TFT LCD Panel
－2 CCFLS Backlight System
－Supported (H1024Pixel × V768Lines) resolution
－By applying 8 bit digital data
5-1-2 Display Characteristics
5-1-3 Optical Characteristics
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5-1-4 Parameter guide line for CCFL Inverter
INVERTER MAX BRINGTHNESS (Vadj:5.0v), LOAD=120KΩX4
(ROOM TEMPERATURE 25℃±4℃)
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
Input voltage Vin 10.8 12 13.2 V
Input current Iin 2250 2500 mA FOR 4 LOAD
Output Current Iout 6.0 6.5 7.0 mA FOR 1 LOAD
Frequency F 50.0
55.0 60.0 KHZ
FOR 1 LOAD
H.V open Vopen 1450 1600 1750 Vrms NO LOAD
H.V Load Vload 710 810 910 Vrms RL=120KΩ
Start voltage Vst 1650 1750 1850 Vrms RL=CCFL
Protect delay time PDT 0.4 1 4 Sec

INVERTER MIN BRINGTHNESS (Vadj:0.0v), LOAD=120KΩX4
(ROOM TEMPERATURE 25℃±4℃)
ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK
input voltage Vin 10.8 12 13.2 V
input current Iin 660 750 mA FOR 4 LOAD
Output Current Iout 3.0 3.5 4.0 mA FOR 1 LOAD
Frequency F 50.0
55.0 60.0 KHZ FOR 1 LOAD
H.V open Vopen 1450 1600 1750 Vrms NO LOAD
Start voltage Vst 1650 1750 1850 Vrms RL=CCFL
H.V Load Vload 350 450 550 Vrms RL=120KΩ
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5-2 SPECIAL FUNCTION with PRESS-KEY
press Menu button during 2 seconds along with plug-in the AC 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.
OSD-INDEX EXPLANATION
1. CABLE NOT CONNECTED: Signal-cable not connected.
2. INPUT NOT SUPPORT:
a. INPUT frequency out of range: H > 63kHz,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)
5-3 SIMPLE-INTRODUCTION about LXH-GJ15L4 chipset
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MODULE-TPYE COMPONENT : Inverter/Power Board
Inverter Block Diagram
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5-4 SOFTWARE FLOW CHART
1
2
N
Y
5
Y
N
10
Y
N
12
Y
N
7
Y
N
6
4
3
8
9
14
11
13
Y
N
1
5
Y
N
16
1
7
19
Y
N
18
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1) MCU initialize.
2) Is the eeprom blank ?
3) Program the eeprom by default values.
4) Get the PWM value of brightness from eeprom.
5) Is the power key pressed ?
6) Clear all global flags.
7) Are the AUTO and SELECT keys pressed ?
8) Enter factory mode.
9) Save the power key status into eeprom.
Turn on the LED and set it to green color.
Scaler initialize.
10) In standby mode ?
11) Update the life time of back light.
12) Check the analog port, are there any signals coming ?
13) Does the scalar send out a interrupt request ?
14) Wake up the scalar.
15) Are there any signals coming from analog port ?
16) Display "No connection Check Signal Cable" message. And go into
standby mode after the message disappear.
17) Program the scalar to be able to show the coming mode.
18) Process the OSD display.
19) Read the keyboard. Is the power key pressed ?
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6. Trouble Shooting
6-1.MAIN BOARD
1.NO SCREEN APPEAR
Note:1. if Replace “MAIN-BOARD” , Please re-do “DDC-content” programmed & “WHITE-Balance”.
2. if Replace “Power Board” only, Please re-do “ WHITE-Balance”
Led orange
NG
OK ,Panel Power OK
OK, input Normal
Check U4 Data-output Block
Replace Power board and Check
Inverter control relative circuit
Re-do White balance adjust
Measured Crystal X1(14.318MHz)
OK, clock
normal
Replace U4 (MST8011B)
OK
Check CN504 pin 10 = 2.5 V?
Check CN504 pin 8 = 3.3 V?
Check CN504 pin 4 = 5 V?
Measured CN402 pin 1/2 = 5V?
Check Correspondent component.
Is there any shortage or cold solder?
Check Power Board.
Yes .there have OSD showYes, all DC level exist
Disconnected the Signal cable( Loose the
Signal cable ),Is the screen show “Cable Not
Connected” ?
Connected the Signal cable again,
Check LED status.
Led Green
Replace U6
Flash Rom
No, nothing is show
Connected the Signal cable
again, Check LED status.
Check Power switch is in Power-on
status and check if Power switch had
been stuck ?
Led Orange
OK, Keyboard no stuck
Led Green
Check the Wire-Harness from CN4 or CN5
was tight enough?,
check the Wire connection to panel side too
Measured RGB (R15,R17,R24) H,V
Input at U3 pin 4,2 ,was there have
signal ?
Check digital signal from CN1
Check Correspondent
component short/open
( Protection Diode )
and Signal cable
bad ?
OK, Wire tight enough
Check Panel-Power Circuit Block
OK, U4 data OK
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PANEL-POWER CIRCUIT
INVERTER Control Relative Circuit
OSCILLATOR BLOCK
OK,R225 have
check R824 should have response from 14V
t
0V
When
we
switch
the
power
switch
from
on
t
Check the PPWR panel power relative circuit,
R223、Q200、Q201(pin2)
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
U501
-
GMZAN1
NG
Measured the Q201 pin 2= 3.3 V? Replace Q201 ( Nmos)
NG, no Voltage
OK,
Replace INVERTER-module
& Re-do white balance
Replace INVERTER to new-one, and
Check the screen is normal ??
Measured the inverter connector CN3
0
Pin 1=14V, pin 3 on/off control=5V
(on)
NG, still no screen
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-res
p
onse when the
p
ower switch turn
NG
NG
OK
OK
Measured U201 Oscillator output R215= 50mhZ ? Replace Oscillator U201
NG , no
transition
OK, has
transitio
Measured X300 Crystal output = 20mhZ ? Replace Crystal X300
NG ,no
transition
OK
Check Q201 pin 3= 3.3V
Yes
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U4-DATA OUTPUT
2.PANEL POWER CIRCUIT
check R84 should have response from
0V to 3.3V
When we switch the power switch from
on to off
NG
Check the PPWR panel power relative circuit, Q1, Q5
In normal operation, when LED =green, R507 should =0 v,
If PPWR no-response when the power switch
Turn on and turn off, replace the U4-GM2116
OK NG, no Voltage
Measured the Q2 pin 1= 5V? Check U6 pin 2= 3.3V
OK
OK,
Replace Q2 ( SY9933ADY-T1)
Yes
Measured ECLK(pin15,16)
HSYNC,VSYNC (pin 176,177 from U4 )
Is there have any transition?
Eclk around 28MHz to 40 MHZ , VSYNC
=60.09Hz , HSYNC around 30KHz-60
KHz ??(refer to input signal=640x480@60 Hz
31k, and LED is green)
Replace MST8011B (U4) or
replace MAINBOARD.
NG , no
transition
If Main Board being replace ,
please do the EDID programming
OK
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3.INVERTER Control Relative Circuit
NG Check the Bklt-On relative circuit, R357, R358,
In normal operation, when LED =green,
R357 Bklt-On should =5 v,
If Bklt-On no-response when the power switch
turn on-off, Replace U203 MST8011B
NG, still no screen
OK
NG Replace Power board
& Re-do white balance
Measured the inverter connector
CN504
pin1 on/off control=3.3V (on)
pin2 PWM signal control dim 0V-5V
Replace power board to new-one
and check the screen is normal?
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4.U4-DATA OUTPUT
Measured ECLK, VSYNC, HSYNC (pin
177,176 from U4 ) Is the waveform ok?
ECLK around 40 MHz , VSYNC =60.09Hz ,
HSYNC around 80 KHz ?(refer to input
signal=640x480@60 Hz 31k, and LED is
Green)
NG , no transition
OK
Replace MST8011B
(U4) or replace Main
board.
Check U4 MST8011B
Signal output
ED00P~02P,ED10P~12P,ED20P~22P
ED00N~02N,ED10N~12N,ED20N~22N
Is the waveform ok ?
OK
If Main Board being replace ,
please do the DDC – content
reprogrammed
OK
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6-2.Power/Inverter Board
1.) No power
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