IBM 140A, 140C, 140F, 140H, 140K, 140L, 140M, 140T, 1419, 143C, 143H, 143K, 143L, 143M, 143T, 1452, 1456, 1459, 1472, 1476, 1479, 147A, 147F, 149C, 149F, 149H, 149K, 149M, 149T, 1412 Setting the Thermal Sensor: , Writing the VPD Data:

Note: If the LCD has no display after changing the ID

code, make sure you write the correct ID code or

try reconnecting the LCD FPC cable connectors.

Setting the Thermal Sensor: The system is

equipped with sensors to protect against system over-

heating. By setting the system and processor thermal

thresholds, the system can turn on the cooling Fan ASM or

shut down automatically when the temperature reaches the

defined threshold parameters.

System experiencing frequent auto sensor shutdown may

need to reset the thermal sensor threshold.

Follow the steps below to set the thermal threshold:

1. Boot from the Maintenance Program Diskette.

2. Select Thermal Sensor Utility from PC DOS 7.0

Startup menu.

3. Follow the instructions on the screen to set the

thresholds.

Writing the VPD Data: The EEPROM on the

planar board contains the vital product data (VPD) — that

is, a system unit serial number and a planar board serial

number. When you replace the planar board, restore the

system unit serial number using the VPD Data Utility. The

serial number label is attached to the computer.

Edit the batch file in the diskette A:\active.bat

VPD_BUILDID

VPD_BOXSERIAL

VPD_PLANARSERIAL

ThinkPad i Series 1400 31

Contents

Main Page Contents iv ThinkPad i Series 1400 Hardware Maintenance Manual Read This First How to Use Error Messages How to Diagnose Multiple FRUs What to Do First 2 Screw Notices Power-On and Setup Password 4 Check Procedures Power Systems Check Checking the AC Adapter: 6 Checking the Operational Charging: Checking the Battery Pack: Planar Board Check Memory Check 8 Keyboard and External Input Device Check Audio Function Check TrackPoint IV Check 10 Diskette Drive Check CD-ROM/DVD-ROM Drive Check Modem Board Check 12 BIOS Utility Navigating the BIOS Utility 14 Power Management Features Screen Blanking Mode Standby Mode Hibernation Mode 16 Symptom-to-FRU Index Numeric Error Codes and Messages 18 Beep Symptoms No Beep Symptoms ThinkPad i Series 1400 19 Keyboard/TrackPoint-Related Symptoms LCD-Related Symptoms 20 ThinkPad i Series 1400 21 Indicator-Related Symptoms Power-Related Symptoms 22 Memory-Related Symptoms Audio-Related Symptoms PC Card (PCMCIA)-Related Symptoms ThinkPad i Series 1400 23 Power Management-Related Symptoms Peripheral-Device-Related Symptom 24 Modem-Related Symptoms Intermittent Problems Undetermined Problems Page Related Service Procedures Flash Memory Update Status Indicators (A-Z) 28 Not all application programs support this function. Power Switch Diagnostic Program Diskette Running the PC Doctor Diagnostics Program: Using the PC Doctor Diagnostics Program: Maintenance Program Diskette Running the Maintenance Program Diskette: 30 Setting the LCD Panel ID: Setting the Thermal Sensor: Writing the VPD Data: Fn Key Combinations 32 Product Overview ThinkPad i Series 1400 33 The following shows an overview of the system features. FRU Removals and Replacements 34 Before FRU Removals and Replacements Screw Type Example Explanation Plugging the Cable: Unplugging the Cable: FPC Cable Connector Type Page DIMM and DIMM Cover Modem Board Cover and Modem Board 38 Keyboard 40 CPU Thermal Plate RTC Battery, CPU EMI Shield and Hard Disk Drive 42 Page PCMCIA Holder 44 LCD Assembly 46 Upper Cover (Keyboard Bezel) 48 CD Control Card Trajection Board and Modem Connector (RJ11 Cable Assembly) 50 DC/DC Charger Audio PCB and S-Video PCB 52 Audio Cable and Speaker Cable Page Audio Connector Board Fan Assembly 56 Diskette and CD-ROM/DVD-ROM Drives Assembly CD-ROM/DVD-ROM Module 58 Diskette Drive (FDD with Bezel) Planar Board 60 LCD Front Cover (12.1-inch) Speakers Indicator Board and Microphone Cable Assembly 62 LCD Panel, LCD Cable and Inverter 64 Hinge LCD Front Cover (14.1-inch) 66 Speakers Indicator Board and Microphone Cable Assembly LCD Panel, LCD Cable and Inverter 68 Page 70 Hinge Locations Front View 72 Bottom View Rear View Switch Locations Keyboard Language (SW3, Switch 1, 2 and 3) Setting 74 Password (SW3, Switch 4) Setting Non-configurable Switches System Unit Parts Listing ThinkPad i Series 1400 75 76 ThinkPad i Series 1400 77 78 LCD Unit Parts Listing 12.1" LCD Unit Parts Listing ThinkPad i Series 1400 79 80 14.1" LCD Unit Parts Listing ThinkPad i Series 1400 81 82 Miscellaneous Parts ThinkPad i Series 1400 83 Telephone/Modem 84 Page Notices 86 Trademarks