Before you start, turn off the laptop and remove the battery.
Remove three screws securing the keyboard on the bottom of the laptop.
There are two latches securing the keyboard on the top.
They are located above the F5 key and NumLk key.
Push on both keyboard latches with a small screwdriver and release the keyboard.
Lift up the keyboard from the laptop case. Be careful, the keyboard is still attached to the motherboard.
Turn the keyboard upside down and place on the palm rest.
Now you can access the keyboard cable connector which is located on the right side from the cooling fan.
When the keyboard is removed, you can access the memory slot. In this laptop you have to use PC2700 DDR333 microDIMM memory module (512MB maximum).
Before you pull the keyboard cable form the connector, the connector has to be unlocked.
In order to unlock the connector, flip the left side of the brown locking clip up with your fingernail. The brown clip will pop up at a 90 degree angle.
After that you can remove the keyboard cable from the connector.
On the following picture the connector is shown in the unlocked position.
Now you can remove the keyboard and replace it with a new one.
The best way to find a new replacement keyboard for your Sony Vaio VGN-T series laptop is searching by the laptop part number.
Search for the keyboard part number on the sticker. In my case the part number is 147898681. You can use this keyboard for Sony Vaio VGN-T150/T250/T350 laptops.
You can buy a new keyboard replacement here: www.maytinhxachtayvietnam.com