Lenovo LXM-L19BH Service Manual

Lenovo LXM-L19BH

SERVICE MANUA

LXM-L19BH

http://www.wjel.net

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

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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： ............................................................................................................ 10

4.3 POWER SUPPLY (ROOM TEMPERATURE 25℃±4℃) ....................................................................................... 10

4.4 PANE L SPECIFICATION .......................................................................................................................................11

5. BLOCK DIAGRAM ..................................................................................................................................................... 13

5.1 SOFTWARE FLOW CHART ................................................................................................................................. 13

5.2 ELECTRICAL BLOCK DIAGRAM.........................................................................................................................15

5.2.1 SCALAR BOARD BLOCK DIAGRAM............................................................................................................ 15

5.2.2 INVERTER/POWER BOARD BLOCK DIAGRAM ......................................................................................... 17

6.SCHEMATIC ............................................................................................................................................................... 19

6.1 MAIN BOARD ....................................................................................................................................................... 19

6.2 INVERTER BOARD .............................................................................................................................................. 26

7. PCB LAYOUT............................................................................................................................................................. 27

7.1 MAIN BOARD ....................................................................................................................................................... 27

7.2 POWER/INVERTER BOARD ............................................................................................................................... 28

8. MAINTAINABILITY ..................................................................................................................................................... 29

8.1 EQUIPMENT AND TOOLS REQUIREMENT........................................................................................................ 29

8.2 TROUBLE SHOOTING......................................................................................................................................... 30

9 WHITE-BALANCE, LUMINANCE ADJUSTMENT ...................................................................................................... 35

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10. EDID CONTENT ...................................................................................................................................................... 36

11.BOM LIST.................................................................................................................................................................. 37

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Lenovo LXM-L19BH

Revision List

Revision Date Change Description

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1. MONITOR SPECIFICATIONS

Type Color TFT LCD

Lenovo LXM-L19BH

LCD Panel

Input

Display Color 16.7M Colors

Dot Frequency 135MHz

Max. Frequency 1280 x 1024

Drug and Play VESA DDC2BTM

Input Interface D-Sub 15Pin

Input Signal Analog 0.7Vpp Positive Signal / 75 Ohm

Max. Display Area

Power DC 12VDC, 3.5A

Environmental Temperature

Humidity

Size 48cm(19inch)

Pixel Pitch 0.294mm(H) x 0.294mm(V)

Video R. G. B analog interface

Separate Sync H/V TTL

H Frequency 30kHz - 80kHz

V Frequency 50Hz-75Hz

Horizontal: 376.32mm

Vertical: 301.06mm

Operating Temperature: 0°C to 40°C (32°F to 104°F)

Storing Temperature: -20°C to 60°C ( -4°F to 140°F)

Operating Humidity: 10% to 85%

Weight (net) 4.4kg

ON Mode: ≤42 Watts

Max. Power Consumption

OFF Mode:

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≤3 Watts

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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.

Inverter/Power board

Monitor Block Diagram

CCFL Drive.

Keyboard

Flat Panel and

CCFL backlight

Main Board

RS232 Connector

For white balance

adjustment in factory

mode

DC-IN

100V-240V

HOST Computer

Video signal, DDC

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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.

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 Indicator condition:

Green — Power On mode

Orange — Power Saving mode

/ Auto Adjust / Exit

3. ▼/ Contrast Adjust 4.

5. Power Indicator 6. Power Switch

2. ▲/ Brightness Adjust

/ Menu/ Select

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3.2 ADJUSTING THE PICTURE

The description for control function:

Lenovo LXM-L19BH

Icon

Adjust

Color

Menu Item Sub Menu

Brightness &

Contrast

Position

Video Noise

Language

OSD Timer

Temperature

Sub Menu

Icon

Horizontal

Vertical

Item

Brightness Adjust the brightness.

Contrast Adjust the contrast.

Position

Phase Adjust the Phase.

Clock Adjust the Clock.

Set OSD Language.

Set the display time of OSD menu.

Color Temperature choose（7800K、6500K、user mode）

Function Description

Adjust the horizontal position.

Adjust the vertical position.

OSD Position

Exit OSD

Reset

OSD

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Horizontal

Adjust the Horizontal Position of OSD menu.

OSD Vertical Adjust the Vertical Position of OSD menu.

Exit OSD

Reset the factory preset configuration

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4. INPUT/OUTPUT SPECFICATION

4.1 15 - Pin D-Sub Signal

PIN NO. DESCRIPTION PI N NO. DESCRIPTION

1. Red 9. +5V

2. Green 10. Logic GND

3. Blue 11. GND

4. Ground 12. DDC-Serial Data

5. Ground 13. H-Sync

6. R-Ground 14. V-Sync

7. G-Ground 15. DDC-Serial Clock

8. B-Ground

VGA Connector layout

11 15

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4.2 FACTORY PRESET DISPLAY MODES：

Lenovo LXM-L19BH

Standard

Dos-Mode

VGA

SVGA

XGA

Resolution

640 × 400 31.47kHz 70Hz

720 × 400 31.47kHz 70Hz

640 × 480 31.47kHz 60Hz

640 × 480 37.861kHz 72Hz

640 × 480 37.50kHz 75Hz

800 × 600 35.156kHz 56Hz

800 × 600 37.879kHz 60Hz

800 × 600 48.077kHz 72Hz

800 × 600 46.875kHz 75Hz

1024 × 768 48.363kHz 60Hz

1024 × 768 56.476 kHz 70 Hz

1024 × 768 56.476kHz 70Hz

1024 × 768 60.02kHz 75Hz

Horizontal

Vertical Frequency

Frequency

SXGA

1280 × 1024 64.000kHz 60Hz

1280 × 1024 80.000kHz 75Hz

4.3 Power Supply (ROOM TEMPERATURE 25℃±4℃)

4.3.1 INVERTER MAX BRINGTHNESS (Vadj:5.0V), LOAD=120KΩX4

ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK

Input voltage

Input current Iin 2200 2450 mA FOR 4 LOAD

Output Current Iout 6.0 6.5 7.0 mA FOR 1 LOAD

Frequency F 52.0 57.0 62.0 KHZ FOR 1 LOAD

H.V open

H.V Load

Start voltage Vst 1700 1850 2000 Vrms RL=CCFL

Protect delay time PDT 0.1 1 4 Sec

4.3.2 INVERTER MIN BRINGTHNESS (Vadj: 0.0V), LOAD=120KΩX4

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Vin

Vopen

Vload

10.8 12 13.2 V

1500 1650 1800 Vrms NO LOAD

710 810 910 Vrms

RL=120KΩ

ITEM SYMBOL MIN. TYP. MAX. UNIT REMARK

input voltage Vin 10.8 12 13.2 V

input current Iin 740 820 mA FOR 4 LOAD

Output Current Iout 3.0 3.5 4.0 mA FOR 1 LOAD

Frequency F 52.0 57.0 62.0 KHZ FOR 1 LOAD

H.V open Vopen 1500 1650 1800 Vrms NO LOAD

Start voltage Vst 1700 1850 2000 Vrms RL=CCFL

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Lenovo LXM-L19BH

H.V Load Vload 350 450 550 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. This module does not contain an inverter card for backlight.

4.4.2 DISPLAYS CHARACTERISTICS

The following items are characteristics summary on the table under 25 ℃ condition:

4.4.3 OPTICAL CHARACTERISTICS

The optical characteristics are measured under stable conditions at 25℃:

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Lenovo LXM-L19BH

4.4.4 Parameter guideline for CCFL Inverter

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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. Lamp units need 1810 voltage minimum for ignition

Note 4: CCFL operation voltage is measured at 25±2℃.

Note 5: The variance of CCFL power consumption is ±10%. Calculator value for reference (ICFL×VCFL×4=PCFL).

Note 6: Definition of life: brightness becomes 50% or less than the minimum luminance value of CCFL. The typical life

time of CCFL is on the condition at 7.0mA lamp current.

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5. BLOCK DIAGRAM

5.1 SOFTWARE FLOW CHART

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5.2 ELECTRICAL BLOCK DIAGRAM

5.2.1 SCALAR BOARD BLOCK DIAGRAM

Lenovo LXM-L19BH

LCD Interface (LVDS)

CN403

OSD Control

Interface

(Keypad)

CN402

Crystal

14.31818 MHz

X401

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EEPROM

U402

(Include MCU，ADC，OSD)

EPR_SDA

EPR_SCL

Scalar

GM2321 PQFP-208

U401

RXD

TXD

D-Sub Connector

H Sync

V Sync

CN301

EEPROM

U302

RGB

DB15_SDA

DB15_SCL

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+ 30 hidden pages

Lenovo LXM-L19BH Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual