Lenovo LXM-WL20AH SERVICE MANUAL LXM-WL20AH 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,...
Lenovo LXM-WL20AH 1. Monitor Specifications Items Specification Model LM201W01 Active Size 20.1 inches(511.133mm) diagonal Panel Aspect ratio 16:10 Pixel Pitch 0.258mm(H) x 0.258mm(V) Color Depth 8 bit, 16.7 colors R. G. B analog signals, 0.7Vp-p / 75Ω Video DVI digital TMDS signals...
Lenovo LXM-WL20AH 2. LCD Monitor Description The LCD MONITOR will contain a main board, an inverter/Power 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.
Lenovo LXM-WL20AH 3. Operating Instructions 3.1 General Instructions Press the power button to turn the monitor on or off. The other control buttons are located by the side of the monitor. By changing these settings, the picture can be adjusted to your personal preferences.
Page 7
Lenovo LXM-WL20AH The description for control function: Menu Sub Menu Sub Menu Menu Item Function Description Icon Icon Item Brightness Adjust the brightness. Brightness & Contrast Contrast Adjust the contrast. Horizontal Adjust the horizontal position. Adjust Position Position Vertical Adjust the vertical position.
Lenovo LXM-WL20AH 4. Input/Output Specification 4.1 15-Pin D-Sub Signal Pin No. Description Pin No. Description DDC +5V Green/ SOG Blue Sense (GND) Sense (GND) Bi-directional data Cable detect H/H+V sync Red GND V-sync Green GND Data clock Blue GND VGA Connector layout 4.2 24-Pin DVI Signal...
Lenovo LXM-WL20AH 5. Panel Specification 5.1 Panel Feature LM201W01 is a Color Active Matrix Liquid Crystal Display with an integral Cold Cathode Fluorescent Lamp (CCFL) backlight system. The matrix employs a-Si Thin Film Transistor as the active element. It is a transmissive type display operating in the normally black mode.
Page 13
Lenovo LXM-WL20AH 1) MCU initializes. 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.
Lenovo LXM-WL20AH 9.2 Trouble Shooting 9.2.1 Main Board Defect Mode Failure Analysis Repair Testing Missing Line Abnormal Display Bright Dot Dark Dot Light Leakage Mura Check Panel Panel Change Image Sticking Dot Defect Brightness Spot Dot Defect Particle No display...
Page 28
Lenovo LXM-WL20AH Noise Check Single Cable Change Single Cable Flicker Check Main board Change Main board Change Panel Check Panel Abnormal Check Main board Change Main board Gray Check Panel Change Panel Check LVD Cable Change LVD Cable R\G\B Check Single Cable...
Page 29
Lenovo LXM-WL20AH LED Display Change Keyboard or LED Off Abnormal Main board or wire Change Keyboard or LED Dark Main board Change Keyboard or LED Abnormal Main board or wire Change Keyboard or LED Flicker Main board or wire Abnormal...
Lenovo LXM-WL20AH 9.2.2 Keypad Board OSD is unstable or not working Connect Key Pad Board Is Key Pad Board connecting normally? Is Button Switch normally? Replace Button Switch Is Key Pad Board normally? Replace Key Pad Board Check Main Board 9.2.3 Power/Inverter Board...
Lenovo LXM-WL20AH 10. white-Balance, Luminance adjustment Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment. When the monitor is in ON status, press MENU button (hold on, do not release) and re-plug power cable, “Auto Level”...
Lenovo LXM-WL20AH 12. BOM List TA90KG4MDLG1NP Location Part No. Description Quan. Unit CBPCA90KG1NP CONVERSION BOARD KEPCA90KG1NP KEY BOARD USBA90KG1P USB BOARD USBA90KG2P USB BOARD 5G6029 1 BASE FILM 11G6045 2 CLAMP_L(BLACK) 12G6203 1 USB RUBBER COVER 15G6293 1 MAIN FRAME...