# Lenovo T4xx series disassembly instructions

A skilled engineer takes around 40 minutes to disassemble, flash and reassemble the whole device.

Read their Hardware Maintenance Manual for detailed steps.

## Steps to access the flash IC

- Unplug the main battery

- Remove the harddisk, CDROM, ExpressCard, SIM-card, SDcard, SmartCard, …

- Open the bottom flap and remove the keyboard screw

- Remove the keyboard

- Remove the screen

- Remove the top enclosure

- Remove the CMOS battery

- Remove the speakers

- Remove WWAN and WIFI card

- Remove the CPU fan

- Unplug the power cable

- Remove the bottom enclosure

- Flip the mainboard and remove the main frame

## Docking stations

The following docking stations are supported by coreboot:

- Type 2505

  - VGA, Ethernet, Modem, PS2, 4 USB Ports

  - Dock ID on pc87382 reads as: 2

- Type 2504

  - Serial, LPT, LEDs, Audio, DVI, VGA, Ethernet, Modem, PS2, 4 USB Ports

  - Dock ID on pc87382 reads as: 1

  - PNP IO address of SuperIO pc87384: 0x2e

There’s no hotplug support for LPT and Serial on Type 2504.

The Dock ID reads as 7 if no dock is connected.