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.