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I tried to reuse some parts of my dead notebook. After watching this video, I tried to attach a PS/2 Cable to my Synaptics based touchpad, which is quite straightforward.

Here are some pictures:

I plan to add custom buttons, as they are on a separate board and one button is defect. This buttons can be connected to T6, Left Mouse Button and T7, Right Mouse Button. 5V = not pressed, 0V = key pressed.

Here is the Pinout for the Synaptics chip (ripped from the video):

Here is the PS/2 male connector, ripped from the video:

There are several versions of this chip, check the model number. For example TM41PUGX134-1, where ‘P’ defines the host protocol: P (PS/2), B (PS/2-and-Serial combo), and A (ADB). Other less common letters are S (Serial-only) and T (TTL-level serial). For more information check the ‘Synaptics TouchPad Interfacing Guide’.