Lenovo LXM-L19BH Service Manual
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Lenovo LXM-L19BH Service Manual

Lenovo LXM-L19BH Service Manual

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Lenovo LXM-L19BH

SERVICE MANUAL

LXM-L19BH
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.
MANUFACTURE DATA ：May-24-2005
Page 1 of 44

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Summary of Contents for Lenovo LXM-L19BH

  • Page 1: Service Manual

    Lenovo LXM-L19BH SERVICE MANUAL LXM-L19BH 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.

  • Page 2: Table Of Contents

    Lenovo LXM-L19BH TABLE OF CONTENTS 1. MONITOR SPECIFICATIONS ............................. 5 2. LCD MONITOR DESCRIPTION ..........................6 3. OPERATING INSTRUCTIONS ............................ 7 3.1 GENERAL INSTRUCTIONS........................... 7 3.2 CONTROL BUTTON............................... 7 3.2 ADJUSTING THE PICTURE........................... 8 4. INPUT/OUTPUT SPECFICATION ..........................9 4.1 15 - PIN D-SUB SIGNAL ............................9 4.2 FACTORY PRESET DISPLAY MODES：...

  • Page 3: Revision List

    Lenovo LXM-L19BH Revision List Revision Date Change Description Page 3 of 44...

  • Page 4: Monitor Specifications

    Lenovo LXM-L19BH 1. MONITOR SPECIFICATIONS Type Color TFT LCD LCD Panel Size 48cm(19inch) Pixel Pitch 0.294mm(H) x 0.294mm(V) Video R. G. B analog interface Separate Sync H/V TTL Input H Frequency 30kHz - 80kHz V Frequency 50Hz-75Hz Display Color 16.7M Colors...

  • Page 5: Lcd Monitor Description

    Lenovo LXM-L19BH 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 Inverter board will drive the backlight of panel and the DC-DC conversion.

  • Page 6: Operating Instructions

    Lenovo LXM-L19BH 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: Adjusting The Picture

    Lenovo LXM-L19BH 3.2 ADJUSTING THE PICTURE The description for control function: Menu Menu Item Sub Menu Sub Menu Function Description Icon Icon Item Brightness & Brightness Adjust the brightness. Contrast Contrast Adjust the contrast. Adjust Horizontal Adjust the horizontal position.

  • Page 8: Input/Output Specfication

    Lenovo LXM-L19BH 4. INPUT/OUTPUT SPECFICATION 4.1 15 - Pin D-Sub Signal PIN NO. DESCRIPTION PI N NO. DESCRIPTION Green Logic GND Blue Ground DDC-Serial Data Ground H-Sync R-Ground V-Sync G-Ground DDC-Serial Clock B-Ground VGA Connector layout Page 8 of 44...

  • Page 9: Factory Preset Display Modes

    Lenovo LXM-L19BH 4.2 FACTORY PRESET DISPLAY MODES： Horizontal Resolution Vertical Frequency Standard Frequency Dos-Mode 640 × 400 31.47kHz 70Hz Dos-Mode 720 × 400 31.47kHz 70Hz 640 × 480 31.47kHz 60Hz 640 × 480 37.861kHz 72Hz 640 × 480 37.50kHz 75Hz 800 ×...

  • Page 10: Panel Specification

    Lenovo LXM-L19BH H.V Load Vload Vrms RL=120KΩ 4.4 PANEL SPECIFICATION 4.4.1 PANEL FEATURE This specification applies to the 19.0 inch Color TFT-LCD Module M190EN03 V1. The display supports the SXGA (1280(H) x 1024(V)) screen format and 16.7M colors (RGB 8-bits data). All input signals are 2 Channel LVDS interface compatible.
  • Page 11 Lenovo LXM-L19BH 4.4.4 Parameter guideline for CCFL Inverter Note 1: CCFL standard current is measured at 25±2℃.. Note 2: CCFL Frequency should be carefully determined to avoid interference between inverter and TFT LCD Note 3: ViCFL means Ignition Voltage for both ends of the lamp, and CCFL inverter should be able to give out a power that has a generating capacity of over 1810 voltage.

  • Page 12: Block Diagram

    Lenovo LXM-L19BH 5. BLOCK DIAGRAM 5.1 SOFTWARE FLOW CHART Page 12 of 44...
  • Page 13 Lenovo LXM-L19BH Page 13 of 44...

  • Page 14: Electrical Block Diagram

    Lenovo LXM-L19BH 5.2 ELECTRICAL BLOCK DIAGRAM 5.2.1 SCALAR BOARD BLOCK DIAGRAM LCD Interface (LVDS) CN403 Scalar GM2321 PQFP-208 (Include MCU，ADC，OSD) U401 OSD Control H Sync Interface V Sync (Keypad) CN402 D-Sub Connector CN301 EPR_SDA EPR_SCL DB15_SDA Crystal DB15_SCL 14.31818 MHz...

  • Page 15: Inverter/Power Board Block Diagram

    Lenovo LXM-L19BH 5.2.2 INVERTER/POWER BOARD BLOCK DIAGRAM Inverter Block Diagram Page 15 of 44...
  • Page 16 Lenovo LXM-L19BH Power Block Diagram Page 16 of 44...

  • Page 17: Schematic

    Lenovo LXM-L19BH 6.SCHEMATIC 6.1 MAIN BOARD SHEET 4 SHEET 5 YUV[0..7] SHEET 3 YUV[0..7] YUV[0..7] VCLK VCLK VCLK SOG_MCSS SOG_MCSS SOG_MCSS /RESET RED+ RED+ RED+ /RESET /RESET RED- RED- RED- GPIO9/SCL GREEN+ GREEN+ GREEN+ GPIO9/SCL GPIO9/SCL GPIO10/SDA GREEN- GREEN- GREEN-...
  • Page 18 Lenovo LXM-L19BH DVI CONNECTOR CN302 Shell RX2-IN RX2- RX2- RX2+IN RX2+ RX2+ RX4- RX4+ DVI_SCL R301 　 1/16W DVISCL DVI_SDA R302 1/16W DVISDA 　 RX1-IN RX1- RX1- RX1+IN RX1+ RX1+ DVI_5V DVI_5V RX3- RX3+ R339 　 1/16W HOT_PLUG R303 1/16W D301 　...
  • Page 19 Lenovo LXM-L19BH AVDD_1.8 +3.3V_DVDD 3.3V_AVDD +3.3V_DVDD 3.3V_LVDS FB401 FB402 3.3V_DVDD TMDS_1.8 CVDD_1.8 PLL_1.8 Close to respective power Pins 600 OHM C401 C402 C403 C404 C405 C406 C407 C408 C409 C410 600 OHM C411 C412 C413 C414 C415 C416 3.3V_LVDS 22uF/16V 0.1uF...
  • Page 20 Lenovo LXM-L19BH +3.3V_DVDD +3V3_A L504 600 OHM C514 C515 C516 C517 C518 C511 22pF C513 47uF/16V 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF X501 R517 14.31818MHz R516 PVVS TP503 　 1/16W R515 PVHS TP502 +3V3_D +1V8_D +3V3_A R514 TP501 +3V3_D C512 22pF...
  • Page 21 Lenovo LXM-L19BH +12V C601 C602 C603 470uF/16V 470uF/16V 0.1uF AUDIO_STBY_MUTE PWM2/GPIO13 U601 TDA7496L CN602 CN601 R601 　 1/16W C604 0.47uF/16V C605 470uF/16V OUTL C606 0.47uF/16V C607 470uF/16V OUTR D601 R602 R603 　 1/16W VOLUME 　 1/16W PHONEJACK D602 LL4148 R604...
  • Page 22 Lenovo LXM-L19BH LV_O[0..9] LV_O[0..9] LV_O0 TX0-O LV_O1 TX0+O CN403 +3.3V_DVDD +12V LV_O2 TX1-O TX0-O TX0+O LV_O3 TX1+O TX1-O TX1+O TX2-O TX2+O LV_O4 TX2-O TXCK-O TXCK+O R447 R448 R449 LV_O5 TX2+O TX3-O TX3+O 　 1/16W TX0-E TX0+E LV_O6 TXCK-O TX1-E TX1+E...
  • Page 23 Lenovo LXM-L19BH R802 　 1/16W BKLT_EN R803 +12V 1/16W 　 R805 Q802 R801 PMBS3904 　 1/16W 　 1/16W R807 CN801 PBIAS PBIAS {4} Q801 BKLT_EN R804 PMBS3904 　 1/16W VCC12V VCC12V 　 1/16W Q803 VCC5V VCC5V C805 C806 R806 47uF/16V...

  • Page 24: Inverter Board

    Lenovo LXM-L19BH 6.2 INVERTER BOARD L201 F201 4A63V Q203 R224 R225 R226 R227 TP1 HVL TP3 HVL +12V Q202 120UH CN201 C202 C201 C230 C215 0.1uF/25V Q201 OPEN D203 DTA144WKA R212 AO4411 PT201 150uF/25V 3.9K 　 1/16W R216 RLZ11B C204...

  • Page 25: Pcb Layout

    Lenovo LXM-L19BH 7. PCB LAYOUT 7.1 MAIN BOARD Page 25 of 44...

  • Page 26: Power/Inverter Board

    Lenovo LXM-L19BH 7.2 Power/Inverter Board Page 26 of 44...

  • Page 27: Maintainability

    Lenovo LXM-L19BH 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. Page 27 of 44...

  • Page 28: Trouble Shooting

    Lenovo LXM-L19BH 8.2 TROUBLE SHOOTING 8.2.1 MAIN BOARD 1.NO SCREEN APPEAR Measured CN801 pin5/6 = 12V? Check Correspondent component. Measured CN801 pin 9/10= 5V? Is there any shortage or cold solder? Measured U802 pin 2= 3.3V? Yes. There is OSD show...
  • Page 29 Lenovo LXM-L19BH 2. PANEL POWER CIRCUIT Check C454 should have response from 0V to 5V Measured X401 waveform is normal? When we switch the power switch from off to on Measured power supply for U401 Replace X401 Check power supply circuit...
  • Page 30 Lenovo LXM-L19BH 4. U4-DATA OUTPUT Measured X401 waveform is Replace X401(14.318MHz) normal? Check GM2321 (U401) Signal output. Check relative circuit to Is the waveform ok? panel Check HS/VS input signal are Check relative component normal? Replace U401 8.2.2 KEYPAD BOARD...
  • Page 31 Lenovo LXM-L19BH 8.2.3 POWER/INVERTER BOARD 1.) No power Check to CN102 pin12 = 12V Check Interface board Check the voltage of C905(+) Check AC line volt 120V or 220V Change F901; check BD901, Q903, and IC901 Check start voltage for the pin3 of IC901...
  • Page 32 Lenovo LXM-L19BH 2.) W / LED, No Backlight Check CN102 pin12 =12V Check adapter or MB Check ON/OFF signal Check Interface board Check U201 pin9=12V Change Q201 or Q202 Check the pin1 of U201 have saw tooth wave Change U201 Check D201(-) have the output of square wave at short time.

  • Page 33: White-Balance, Luminance Adjustment

    Lenovo LXM-L19BH 9 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 34: Edid Content

    Lenovo LXM-L19BH 10. EDID CONTENT Analog EDID Page 34 of 44...

  • Page 35: Bom List

    Lenovo LXM-L19BH 11.BOM LIST T980KADHDLH3N Location Part No. for TPV Description Quan. Unit CBPC980KAVHW CONVERSION BOARD IDPC1942AUL1 INVERTER DC BOARD KEPC980KAZ KEY BOARD 15G8073 11 MAIN FRAME 33G4759 AI T KEY PAD 33G4760 1 L LENS 34G1387AOW B BEZEL 34G1388 IG 2B...
  • Page 36 Lenovo LXM-L19BH 750LLU90N03 AU 19" EN03 V1 PANEL CBPC980KAVHW AIC980KAVHW MAIN BOARD 40G 457624 1B LABEL-CPU 40G 45762412B CBPC LABEL C401 67L309V220 3 22UF +-20% 16V C411 67L309V220 3 22UF +-20% 16V C417 67L309V220 3 22UF +-20% 16V C419 67L309V220 3...
  • Page 37 Lenovo LXM-L19BH C310 65G0603470 32 CHIP 47PF 50V X7R C311 65G0603470 32 CHIP 47PF 50V X7R C402 65G0603104 32 CHIP 0.1UF 50V X7R C403 65G0603104 32 CHIP 0.1UF 50V X7R C404 65G0603104 32 CHIP 0.1UF 50V X7R C405 65G0603104 32 CHIP 0.1UF 50V X7R...
  • Page 38 Lenovo LXM-L19BH C447 65G0603104 32 CHIP 0.1UF 50V X7R C448 65G0603104 32 CHIP 0.1UF 50V X7R C451 65G0603104 32 CHIP 0.1UF 50V X7R C453 65G0603104 32 CHIP 0.1UF 50V X7R C455 65G0603104 32 CHIP 0.1UF 50V X7R C456 65G0603104 32 CHIP 0.1UF 50V X7R...
  • Page 39 Lenovo LXM-L19BH FB409 71G 56Z601 CHIP BEAD 600 OHM 0805 FB801 71G 56Z601 CHIP BEAD 600 OHM 0805 FB802 71G 56Z601 CHIP BEAD 600 OHM 0805 Q401 57G 417 4 PMBS3904/PHILIPS-SMT(04 Q402 57G 417 4 PMBS3904/PHILIPS-SMT(04 Q403 57G 417 4...
  • Page 40 Lenovo LXM-L19BH R407 61L0603103 RST SM 0603 RC0603 10K R415 61L0603000 RST SM 0603 JUMP MAX 0R R417 61L0603103 RST SM 0603 RC0603 10K R418 61L0603101 RST SM 0603 RC0603 100R R420 61L0603103 RST SM 0603 RC0603 10K R421 61L0603103...
  • Page 41 Lenovo LXM-L19BH C101 67L215V221 4K EC 220F 25V C102 67L215V221 4K EC 220F 25V C103 67L215B471 3H 470UF 16V LTR471M1CF11V C201 67L215C151 4H LOW ESR 150UF 25V 8*7MM C207 67G 305330 7T 33UF 105 　 C213 63L210J1842A2 PMS 0.18UF 250V...
  • Page 42 Lenovo LXM-L19BH C206 65G0805104 22 0.1UF +-10% 25V X7R 080 C208 65G0805331 31 CHIP 330pF 50V NPO C209 65G0805105 27 CHIP 1UF Y5V 0805 C210 65G0805105 27 CHIP 1UF Y5V 0805 C211 65G0805105 27 CHIP 1UF Y5V 0805 C212 65G0805105 27...
  • Page 43 Lenovo LXM-L19BH R209 61L0603472 RST SM 0603 RC0603 4K7 R210 61L0603153 CHIPR 15KOHM+-5% 1/10W R211 61L0603153 CHIPR 15KOHM+-5% 1/10W R212 61L0603392 CHIP 3.9K OHM 1/10W R213 61L0603392 CHIP 3.9K OHM 1/10W R214 61L0603392 CHIP 3.9K OHM 1/10W R215 61L0603392 CHIP 3.9K OHM 1/10W...
  • Page 44 Lenovo LXM-L19BH R230 61G 17210252T 1K OHM 5% 1/4W R231 61G 17210252T 1K OHM 5% 1/4W R232 61G 17210252T 1K OHM 5% 1/4W R233 61G 17210252T 1K OHM 5% 1/4W KEPC980KAZ AIK980KAZSMT KEY BOARD FOR SMT 715L1317 D 65G0603104 32 CHIP 0.1UF 50V X7R...

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