联想液晶显示器-LXB-L17C维修手册

SERVICE MANUAL
LXB-L17C
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 OFTHIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES, ERRORS OR OMISSIONS.
Revision List
The LCD MONITOR will contain a main board, an inverter/PWPC board and a keypad board which house the flat panel control logic, brightness control logic and DDC.
The power board will provide the AC to DC voltage to drive backlight and the main board chips each voltage.
3. OPERATING INSTRUCTIONS
3.1 GENERAL INSTRUCTIONS
Press the power button to turn the monitor on or off. The other control buttons are located at the front of the monitor. By changing these settings, the picture can be adjusted to your personal preferences.
-The power cord should be connected.
-Connect the video cable from the monitor to the video card.
-Press the power button to turn on the monitor, the power indicator will light up.
3.2 CONTROL BUTTON
Power button：Power Indicator will turn off when the monitor is in Power Saving status, and return normal while the button is pressed once again.
Left and Right Button: the function button of monitor，used to adjust function and value.
Auto Adjust button / Exit:
a. When OSD Menu is in activate status, this button will act as EXIT-KEY (Exit OSD menu)
b. When OSD Menu is in OFF status, press this button to activate the Auto Adjustment function.
The Auto Adjustment function is used to optimized the HPos, VPos, Clock and Focus.
Power Indicator condition:
Green —Power On mode
Orange —Power Saving mode
Black —Power Off mode
A. Power Button/ Power Indicator: Press the button to switch ON/OFF of monitor’s power,
Green – Power On mode
Orange – Power saving mode
B. Decrease the value of selected item/Activate the Brightness Adjustment.
C. Increase the value of selected item/Activate the Contrast Adjustment.
D. When the OSD menu is in OFF status, press the button for one second to activate the Auto Adjustment
function
Exit OSD menu when in volume OSD status.
E. Active OSD menu or function adjust confirm .
3.3 ADJUSTING THE PICTURE
4. INPUT/OUTPUT SPECFICATION 4.1 Input Signal connector
4.2 FACTORY PRESET DISPLAY MODES：
4.3 PANEL SPECIFICATION
4.3.1 PANEL FEATURE
- Wide viewing angle
- High contrast ratio
- Fast response time
- High color saturation (EBU Like Specifications)
- SXGA (1280 x 1024 pixels) resolution
- DE (Data Enable) only mode
- LVDS (Low Voltage Differential Signaling) interface - RoHS Compliance
4.3.2 DISPLA YS CHARACTERISTICS
4.3.3 OPTICAL CHARACTERISTICS
Optical Characteristics
The relative measurement methods of optical characteristics are shown in 4.4.3
4.3.4 Parameter guideline for CCFL Inverter
1. TFT LCD Module:
2. Back Light Unit:
5. BLOCK DIAGRAM 5.1 Monitor Exploded View
5.1 Software Flow Chart
1) MCU initialize.
2) Is the EPROM blank?
3) Program the EPROM by default values.
4) Get the PWM value of brightness from EPROM.
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 EPROM.
Turn on the LED and set it to green color.
Scalar initializes.
10) In standby mode?
11) Update the lifetime of back light.
12) Check the analog port, are there any signals coming?
13) Does the scalar send out an 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?
Lenovo LXB-L17C
Page 18 of 50 5.3 ELECTRICAL BLOCK DIAGRAM
5.2.1 SCALAR BOARD BLOCK DIAGRAM
Lenovo LXB-L17C 5.2.2 INVERTER/POWER BOARD BLOCK DIAGRAM
6.SCHEMATIC
6.1 MAIN BOARD
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7. PCB LAYOUT
7.1 MAIN BOARD
715L1129-2-LE3
7.2 Power Board
715L1103-2-17A
7.3 Key Board
715L1139-1
8. MAINTAINABILITY
8.1 EQUIPMENT AND TOOLS REQUIREMENT
1、Voltmeter.
2.、Oscilloscope.
3、Pattern Generator.
4、DDC Tool with a IBM Compatible Computer.
5、Alignment Tool
6、LCD Color Analyzer.
7、Service Manual.
8、User Manual.
8.2 TROUBLE SHOOTING 8.2.1 Main Board
No power
No picture (LED orange)
White screen
8.2.2 KEYPAD BOARD
8.2.3 Power Board
2.) W / LED, No Backlight
9 white-Balance, Luminance adjustment
Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment.
1. How to do the Chroma-7120 MEM. Channel setting
A. Reference to chroma 7120 user guide
B. U se “ SC” key and “ NEXT” key to modify X yY value and use “ID” k ey to modify the
TEXT description Following is the procedure to do white-balance adjust
2. Setting the color temp. you want
A. MEM.CHANNEL 3 (7800 color):
7800 color temp. parameter is x = 296 ±15, y = 311 ±15, Y = 200±20 cd/m2 ,
B. MEM.CHANNEL 4 (6500 color):
6500 color temp. parameter is x = 313±15, y = 329 ±15, Y =200±20 cd/m2
3. Into factory mode of LXB-L17C
Press MENU button during 2 seconds along with press Power button will activate the factory mode, then MCU will do AUTO LEVEL automatically. Meanwhile press MENU the OSD screen will be located at LEFT TOP OF PANEL.
4. Bias adjustment:
Set the Contrast to 50; Adjust the Brightness to 80.
5. Gain adjustment:
Move cursor to “-F-” and press MENU key
A. Adjust C2 (7800) color-temperature
1. Switch the Chroma-7120 to RGB-Mode(with press “MODE” button)
2. Switch the MEM. Channel to Channel 3 (with up or down arrow on chroma 7120)
3. The LCD-indicator on chroma 7120 will show x = 296 ±15, y = 311 ±15, Y =200±20 cd/m2
4. Adjust the RED of color1 on factory window until chroma 7120 indicator reached the value R=100
5. Adjust the GREEN of color1 on factory window until chroma 7120 indicator reached the value G=100
6. Adjust the BLUE of color1 on factory window until chroma 7120 indicator reached the value B=100
7. Repeat above procedure (item 4,5,6) until chroma 7120 RGB value meet the tolerance =100±2
B. Adjust C1 (6500) color-temperature
1. Switch the chroma-7120 to RGB-Mode(with press “MODE” button)
2. Switch the MEM.channel to Channel 4(with up or down arrow on chroma 7120)
3. The LCD-indicator on chroma 7120 will show x = 313 ±15, y = 329 ±15, Y = 200±20 cd/m2
4. Adjust the RED of color3 on factory window until chroma 7120 indicator reached the value R=100
5. Adjust the GREEN of color3 on factory window until chroma 7120 indicator reachedthe value G=100
6. Adjust the BLUE of color3 on factory window until chroma 7120 indicator reached the value B=100
7. Repeat above procedure (item 4,5,6) until chroma 7120 RGB value meet the tolerance =100±2
C. Turn the Power-button off to quit from factory mode.
10. EDID CONTENT
Analog EDID
11. BOM LIST
T780KK4MDLG1N
8547UF +-20% 16V 8547UF +-20% 16V
4.7UF 20% 50V 105 10522UF +-20% 50。