LENOVO L2021 Wide LCD Monitor Service mode - Software update - DDC writing - Power supply circuit - Power Board715G4174-2 - LD7552BPS - Back light Inverter circuit – LCD monitor repair and service – Manual service
Category: LCD Monitor Repair and Service
Contents of this article
- How to access service mode
- Software update procedure
- Power supply circuit diagram
- Back light inverter circuit
LENOVO L2021
Maintenance
Maintainability Requirement
1. Voltmeter. & digital multimeter
2. Oscilloscope.
3. Pattern Generator.
4. DDC Tool with Compatible Computer.
5. Alignment Tool.
6. LCD Color Analyzer.
7. Service Manual.
8. User Manual.
9. repair tools etc
1. Voltmeter. & digital multimeter
2. Oscilloscope.
3. Pattern Generator.
4. DDC Tool with Compatible Computer.
5. Alignment Tool.
6. LCD Color Analyzer.
7. Service Manual.
8. User Manual.
9. repair tools etc
Disassembly SOP
Precaution
Please read the precautions as follows to prevent any damages to the LCD Monitor
Make sure all power connection is removed. Be sure that the LCD Monitor is in power off status.
Precaution
Please read the precautions as follows to prevent any damages to the LCD Monitor
Make sure all power connection is removed. Be sure that the LCD Monitor is in power off status.
1.Prepare soft cloth and sponge as working platform to place LCD monitor horizontally.
2. Hold LCD by the side carefully and DON’T touch or press panel directly.
3. appropriate tools
select the appropriate tools for disassembly and re-assembly.
select the appropriate tools for disassembly and re-assembly.
Phillips screwdriver
spacer screwdriver
C/D Disassembly Tool
Gloves or soft cloth
spacer screwdriver
C/D Disassembly Tool
Gloves or soft cloth
Software update step
After replacing the Main board and the Panel, Check if white-balance is within the specs ,then re-writing DDC is necessary.
Software information
After replacing the Main board and the Panel, Check if white-balance is within the specs ,then re-writing DDC is necessary.
Software information
U401
|
056G1125191
|
IC
RTD2122L-LF LQFP-48
|
SMTCR-U401
|
100GLRSA006B11
|
L2021W_SEC_LTM200KT03_M20_
RTD2545LH_100729_v0.01_Eng.H00
|
U501
|
056G
562201
|
IC
RTD2545LH-GR QFN-48
|
CBPCARJG1J1
|
G3327-1-X-X-2-090407
FOR L2021WA
|
2. Will be the Monitor VGA cable to connect ISP tool ；
3. ISP tool card connection as shown below
Step2： Installing driver software
1.To install the USB driver software, mstar ISP Driver3-DB07-6-XP-driver
1.To install the USB driver software, mstar ISP Driver3-DB07-6-XP-driver
Step3： Run software “RTD Tool V1.7 version”
1.selected ISP,-àRTD2122
,as shown in, Press the icon to select,Note save HDCP key:
2.selcted “Page Select”
3.Click “64K”,selcted software files
In this way, Automatic Identification space
size,Next ,selected “Externd True Size”
4.Click Program icon ,Programming
started,After Programming, Appear PASS.
Writing DDC program step
1. Prepared the PC with Windows XP system, DDC recording device (12V)for figure below
2. Connect the DDC recording device and the PC through PC parallel port
3. setup “Port95nt” driver program to PC ,
4. select relevant program and run it, below figure will appear
5, Press “LoadFile”, select EDID -model of product, and select input port;
6. key in SN,and other informatiom, key-press “Pragram” button;
1. Prepared the PC with Windows XP system, DDC recording device (12V)for figure below
2. Connect the DDC recording device and the PC through PC parallel port
3. setup “Port95nt” driver program to PC ,
4. select relevant program and run it, below figure will appear
5, Press “LoadFile”, select EDID -model of product, and select input port;
6. key in SN,and other informatiom, key-press “Pragram” button;
SERVICE MODE
Factory mode adjustment
After replacing the Main board and the Panel, Check for enter the Factory mode ,then re-writing DDC is necessary.
Press MENU button and hold,reinsert the Power cord , then ,press MENU , the monitor will may enter Factory OSD Menu. Then Press . Factory OSD Menu will appear in the screen.
After replacing the Main board and the Panel, Check for enter the Factory mode ,then re-writing DDC is necessary.
Press MENU button and hold,reinsert the Power cord , then ,press MENU , the monitor will may enter Factory OSD Menu. Then Press . Factory OSD Menu will appear in the screen.
In normal user mode, open the menu to restore
factory default values
POWER SUPPLY CIRCUIT DIAGRAM
Power Board715G4174-2
CLICK ON THE IMAGES TO ZOOM IN
