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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,
ERRORS OR OMISSIONS.
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Summary of Contents for Lenovo LXM-WL20AH
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Page 1: Service Manual
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,... -
Page 2: Table Of Contents
Lenovo LXM-WL20AH Table of Content Revision …………………………………………………………………………………………………………………. 1. Monitor Specifications…………………………………………………………………………………………… 2. LCD Monitor Description………………………………………………………………………………..………… 3. Operating Instructions……………………………………………………………………………………………... 3.1 General Instructions…………………………………………………………………………………………..….. 3.2 Control Button …………………………………………………………………………………………………..3.3 Adjust the Picture………………………………….………………………………………………………….….. 4. Input/Output Specification………………………………………………………………………………………..4.1 15 Pin D-Sub Signal ….……………...……………………………………………………...………………...… 4.2 24 Pin DVI Signal…………………………………………………………………………………………………. -
Page 3: Revision
Lenovo LXM-WL20AH Revision List Version Date Revision History TPV Model Name Jan-23, 2006 Initial Release TA90KG4MDLG1NP... -
Page 4: Monitor Specifications
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... -
Page 5: Lcd Monitor Description
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. -
Page 6: Operating Instructions
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.
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Page 8: Input/Output Specification
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... -
Page 9: Factory Preset Display Modes
Lenovo LXM-WL20AH 4.3 Factory Preset Display Modes: Horizontal Vertical Pixel Dot total Timing Frequency (kHz) Frequency (Hz) Frequency (mHz) NTSC VGA@60Hz 800 × 640 31.469 59.94 25.175 PAL VGA@50Hz 884× 700 31.25 27.625 640x480 VGA-480-60Hz 800 × 640 31.469 59.94 25.175... -
Page 10: Panel Specification
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 11: Electrical Characteristics
Lenovo LXM-WL20AH 0.145 BLUE 0.070 0.313 WHITE 0.329 θ Horizontal degree CST_H Color shift θ Vertical CST_V Viewing Angle (CR>10) θ Horizontal General degree θ Vertical θ Horizontal GMA_H Effective degree θ Vertical GMA_V Gray Scale 5.4 Electrical Characteristics Values... -
Page 12: Block Diagram
Lenovo LXM-WL20AH 6. Block Diagram 6.1 Software Flow Chart... - 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.
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Page 14: Explored Viewing
Lenovo LXM-WL20AH 6.2 Exploded Viewing... -
Page 15: Electrical Block Diagram
Lenovo LXM-WL20AH 6.3 Electrical Block Diagram Scalar Board Block Diagram LCD Interface Scalar MST9251A-LF-165 PQFP-20 NT68P631ALG PLCC-44 (Include ADC, OSD) U351 EPR_SDA Crystal EPR_SCL X351 H Sync 12MHz DVI Video OSD Control EEPROM V Sync Interface Signals AT24C16 (Keypad) U353... -
Page 16: Schematic
Lenovo LXM-WL20AH 7. Schematic 7.1 Main Board CN202 C235 0.1uF/16V C234 0.1uF/16V C236 0.1uF/16V C237 0.1uF/16V C238 0.1uF/16V R260 1/16W R244 1/16W C221 0.047uF RIN+ +5V_ESD +5V_ESD +5V_ESD +5V_ESD +5V_ESD +5V_ESD +5V_ESD R261 0 1/16W R249 ... - Page 17 Lenovo LXM-WL20AH VCPU VCPU VCPU L351 +3.3V VCPU C359 C351 120 OHM R360 R358 R364 R365 R366 R367 R361 10K 1/16W C354 22pF 10uF/16V 0.1uF/16V X351 10K 1/16W 10K 1/16W 10K 1/16W R351 10K 1/16W ...
- Page 18 Lenovo LXM-WL20AH U405 MM1117ST33 +3.3VMST PANEL_VCC +3.3AVDD +3.3AVDD_A +3.3VDD_M L413 120 OHM L402 120 OHM +3.3DV +3.3AVDD_P +1.8VDDC1 C455 C456 C457 +3.3AVDD_D 177mV C403 C404 C451 10uF/16V 10uF/16V 0.1uF/16V +2.5MVDD +1.8VDDC2 +3.3AVDD_P2 C449 C450 10uF/16V +3.3AVDDA 10uF/16V 0.1uF/16V 0.1uF/16V 0.1uF/16V...
- Page 19 Lenovo LXM-WL20AH +12V R501 47 1/16W BRIGHTNESS BRIGHTNESS R513/NC R514 R515 R516 +3.3V BL_CONTROL R502 1/16W BL_CONTROL C512 R503 47 1/16W PANEL_IDX R530 0.1uF/16V PANEL_IDX 1/16W R519 1/16W C511 C510 1/16W R526 R504/NC 220 ...
- Page 20 Lenovo LXM-WL20AH MMC-162mV 274mV +2.5VDDR U302 +2.5VDDR +2.5V_DMC +2.5VDDR +2.5V_DMQ L302 L301 C332 C333 C334 120 OHM C312 C311 C313 C314 C315 C316 C317 C318 C319 C320 120 OHM C303 C302 C304 C305 C306 C307 C308 C309 C310 10uF/16V 10uF/16V 22uF/16V 0.1uF/16V...
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Page 21: Power Board
Lenovo LXM-WL20AH 6.2 Power Board - 21 -... - Page 22 Lenovo LXM-WL20AH - 22 -...
- Page 23 Lenovo LXM-WL20AH 6.3 Key Board CN101 KEY2 KEY1 CONN LED-G LED-O R101 100 1/16W K-PWR KEY1 KEY2 C101 C102 C103 C104 C105 0.01uF 0.01uF 0.01uF 0.01uF 0.01uF R105 R104 R103 R102 1/16W 1/16W 1/16W 1/16W ...
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Page 24: Pcb Layout
Lenovo LXM-WL20AH 8. PCB Layout 8.1 Main Board - 24 -... -
Page 25: Power Board
Lenovo LXM-WL20AH 8.2 Power Board - 25 -... -
Page 26: Maintainability
Lenovo LXM-WL20AH 9. Maintainability 9.1 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. - 26 -... -
Page 27: Trouble Shooting
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...
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Page 30: Keypad Board
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... - Page 31 Lenovo LXM-WL20AH - 31 -...
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Page 32: White-Balance, Luminance Adjustment
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”... -
Page 33: Edid Content
Lenovo LXM-WL20AH 11. EDID Content Analog EDID Digital EDID - 33 -... -
Page 34: Bom List
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... - Page 35 Lenovo LXM-WL20AH M1G1730 6128 SCREW M3x6 M1G1740 6128 SCREW M1G1740 10 47 SCREW Q1G 330 6120 SCREW Q1G 330 8120 SCREW 3X8mm Q1G 330 8120 SCREW 3X8mm Q1G 330 8120 SCREW 3X8mm Q1G 330 10120 SCREW FOR FP/RC 705GA90KS34001 20" LCD COVER ASS'Y...
- Page 36 Lenovo LXM-WL20AH C205 65G0603104 12 CER2 0603 X7R 16V 100N C214 65G0603104 12 CER2 0603 X7R 16V 100N C215 65G0603331 32 CHIP 330PF 50V X7R C216 65G0603331 32 CHIP 330PF 50V X7R C217 65G0603330 31 CER1 0603 NP0 50V 33P P...
- Page 37 Lenovo LXM-WL20AH C318 65G0603104 12 CER2 0603 X7R 16V 100N C319 65G0603104 12 CER2 0603 X7R 16V 100N C320 65G0603104 12 CER2 0603 X7R 16V 100N C321 65G0603104 12 CER2 0603 X7R 16V 100N C322 65G0603104 12 CER2 0603 X7R 16V 100N...
- Page 38 Lenovo LXM-WL20AH C419 65G0603104 12 CER2 0603 X7R 16V 100N C420 65G1206106 17 CHIP 10UF 16V Y5V C421 65G1206106 17 CHIP 10UF 16V Y5V C422 65G0603104 12 CER2 0603 X7R 16V 100N C423 65G1206106 17 CHIP 10UF 16V Y5V C424...
- Page 39 Lenovo LXM-WL20AH C503 67G311F470 3T 47UF 16V 105 PANASONICV C504 65G0603104 12 CER2 0603 X7R 16V 100N C505 65G0603104 12 CER2 0603 X7R 16V 100N C506 67G311F470 3T 47UF 16V 105 PANASONICV C510 65G0603104 12 CER2 0603 X7R 16V 100N...
- Page 40 Lenovo LXM-WL20AH L204 71G 56G151 A TB160808G151 L301 71G 56K121 CHIP BEAD L302 71G 56K121 CHIP BEAD L351 71G 56K121 CHIP BEAD L401 61L1206000 RST SM 1206 JUMP MAX 0R L402 71G 56K121 CHIP BEAD L403 71G 56K121 CHIP BEAD...
- Page 41 Lenovo LXM-WL20AH R238 61L0603101 RST SM 0603 RC0603 100R R239 61L0603101 RST SM 0603 RC0603 100R R240 61L0603101 RST SM 0603 RC0603 100R R241 61L0603222 RST SM 0603 RC0603 2K2 R242 61L0603222 RST SM 0603 RC0603 2K2 R243 61L0603750 9F...
- Page 42 Lenovo LXM-WL20AH R360 61L0603103 RST SM 0603 RC0603 10K R361 61L0603103 RST SM 0603 RC0603 10K R364 61L0603103 RST SM 0603 RC0603 10K R365 61L0603103 RST SM 0603 RC0603 10K R366 61L0603103 RST SM 0603 RC0603 10K R367 61L0603103 RST SM 0603 RC0603 10K...
- Page 43 Lenovo LXM-WL20AH R516 61L0603103 RST SM 0603 RC0603 10K R517 61L0603104 RST SM 0603 RC0603 100K R518 61L0603103 RST SM 0603 RC0603 10K R519 61L0603103 RST SM 0603 RC0603 10K R520 61L0603223 CHIPR 22K OHM +-5% 1/10 R525 61L0603103 RST SM 0603 RC0603 10K...
- Page 44 Lenovo LXM-WL20AH C103 65G0603103 32 0.01UF +-10% 50V X7R C104 65G0603103 32 0.01UF +-10% 50V X7R C105 65G0603103 32 0.01UF +-10% 50V X7R D106 93G 39146 LL5232B D107 93G 39146 LL5232B R101 61L0603101 RST SM 0603 RC0603 100R R102 61L0603103...