TP 390,390E,1720 - FRU Removals and Replacements

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Service Hints & Tips

Document ID: BMOE-425RQZ

TP 390,390E,1720 - FRU Removals and Replacements

Applicable to: World-Wide

The following information is intended for IBM Dealers and Authorized Servicers only. Customers attempting to follow any of the procedures below may void their warranty.

FRU Removals and Replacements
This section contains information about removals and replacements.

Do not damage any parts. Only certified and trained personnel should service the computer.
The arrows in this section show the direction of movement to remove a FRU, or to turn a screw to release the FRU. The arrows are marked in numeric order, in square callout, to show the correct sequence of removal.
When other FRUs must be removed before the failing FRU is removed, they are listed at the top of the page.
To replace a FRU, reverse the removal procedure and follow any notes that pertain to replacement.
When replacing a FRU, use the correct screw size, as shown in the procedures.

Safety Notice 1:
Before the computer is powered on after FRU replacement, make sure all screws, springs, or other small parts are in place and are not left loose inside the computer. Verify this by shaking the computer and listening for rattling sounds. Metallic parts or metal flakes can cause electrical short circuit.

Safety Notice 4:
The lithium battery can cause a fire, explosion, or severe burn. Do not recharge it, remove its polarized connector, disassemble it, heat it above 100›C (212 ›F), incinerate it, or expose its cell contents to water. Dispose of the battery as required by local ordinances or regulations. Use only the battery in the appropriate parts listing. Use of an incorrect battery can result in ignition or explosion of the battery.

Safety Notice 8:
Before removing any FRU, power-off the computer, unplug all power cords from electrical outlets, remove the Battery ASM, and then disconnect any interconnecting cables.

An electrostatic discharge (ESD) strap (P/N 6405959) must be used to establish personal grounding.

FRU Service Procedures
Review the following procedures before replacing any FRU.

LCD FRU Replacement Notice: The TFT LCD for the notebook computer contains over 2,359,296 thin-film transistors (TFTs). A small number of missing, discolored, or lighted dots (on all the time) is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns. The LCD should be replaced if the number of missing, discolored, or lighted dots in any background is 8 or more.

Replacing the System Board: When you replace the system board, restore the system unit serial number using the VPD Data Utility and reassign the UUID using the Flash UUID Utility in the ThinkPad 390/i Series 1700 or 390E CE Utility Diskette.

Note: Do not power off the computer while restoring the VPD.

Important Notices: When you service this machine, do the following,
This computer uses special nylon-coated screws with the following characteristics:

They maintain tight connections.
They do not easily come loose, even with shock or vibration.
They need additional force to tighten.
They should be used only once.

When you service this machine, do the following,

Keep the screw kit (P/N 05K5489) in your tool bag.
Always use new screws. Plastic screws cannot be reused.
Use a torque screwdriver if possible.

Screw Tightening Information: Loose screws can cause a reliability problem. The IBM ThinkPad computer addresses this problem with nylon-coated screws. Tighten screws as follows,

Plastic to plastic

Turn an additional 90 degrees after the screw head touches the surface of the plastic part.

Logic card to plastic

Turn an additional 180 degrees after the screw head touches the surface of the logic card.

Torque driver

If you have a torque driver, refer to the torque instructions with each step.

- Battery Assembly
- Hard Disk Drive
- Combo Bay
- Diskette Drive (FDD ASM)
- CD ROM ASM
- Combo Bay FPC
- Hard Disk Adapter Combo Bay ASM
- Modem Card
- Backup Battery
- Keyboard
- LED Board
- Upper Heatsink
- PCMCIA Slots
- CPU Board
- LCD Panel ASM
- Upper Cover ASM
- IMM Lower Heatsink ASM
- Fan ASM
- Power Latch, IR Board, and DC-DC & BATT Board
- Planar Board
- ComboBay Interposer Board

- LCD Bezel ASM 14.1"
- Speaker ASM 14.1"
- VR Board ASM 14.1"
- Microphone ASM 14.1"
- LCD Panel ASM 14.1"
- LCD Inverter ASM 14.1"
- LCD FPC ASM 14.1"

- LCD Bezel ASM 13.3"
- Speaker ASM 13.3"
- VR Board ASM 13.3"
- LCD Inverter ASM 13.3"
- Microphone ASM 13.3"
- LCD Panel ASM 13.3"
- LCD FPC ASM 13.3"

- LCD Bezel ASM 12.1"
- Speaker ASM 12.1"
- VR Board ASM 12.1"
- LCD Inverter ASM 12.1"
- Microphone ASM 12.1"
- LCD Panel ASM 12.1"
- LCD FPC ASM 12.1"

Search Keywords

Hint Category

Hardware Installation/Configuration, Hardware Maintenance Information

Date Created

11-11-98

Last Updated

23-03-99

Revision Date

23-03-2000

Brand

IBM ThinkPad

Product Family

ThinkPad 390, ThinkPad i Series 172x

Machine Type

2626, 2627

Model

Various

TypeModel

Retain Tip (if applicable)

Reverse Doclinks
and Admin Purposes

Plastic to plastic	Turn an additional 90 degrees after the screw head touches the surface of the plastic part.
Logic card to plastic	Turn an additional 180 degrees after the screw head touches the surface of the logic card.
Torque driver	If you have a torque driver, refer to the torque instructions with each step.

	Search Keywords
	Hint Category	Hardware Installation/Configuration, Hardware Maintenance Information
	Date Created	11-11-98
	Last Updated	23-03-99
	Revision Date	23-03-2000
	Brand	IBM ThinkPad
	Product Family	ThinkPad 390, ThinkPad i Series 172x
	Machine Type	2626, 2627
	Model	Various
	TypeModel
	Retain Tip (if applicable)
	Reverse Doclinks and Admin Purposes