The ZenBook 3 UX390UA is equipped with a processor from Intel’s 7th Generation Core (“Kaby Lake”) family: a Core i5-7200U with integrated Intel HD Graphics 620, along with 512GB SSD and 8GB of RAM. The 12.5″ Full HD (1920×1080) display is covered in Gorilla Glass. It is only has a single USB-C port on the right side, and there’s a headset jack on the left.
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Remove eight screws from the bottom case.
There is no clip fixed the case. So you can remove it pretty easy.
When the bottom case removed, you can get access the internal components. The ZenBook 3 UX390UA has very outstanding design and craftsmanship. The ultrabook is thinner and the internal is also compact.
Here’s bottom case, there are only two speaker vents on the bottom half.
It is like other ultrabook, the battery is taking up the most spaces.
In order to the further disassembly, we need to remove the battery first.
Disconnect the battery connector from the motherboard.
Remove all screws securing the battery to its body.
Because there is no glue on the back of the battery, so you can easily remove the battery.
The ZenBook 3 UX390UA comes with a 7.7V, 40Wh Li-polymer battery, Asus P/N: C23N1606.
Under the battery, you can find the touchpad, and beside the battery, there are two speaker modules.
Remove one screw and take out the SSD from its slot.
There is a layer of graphite stickers and thermal grease on the SSD.
After the graphite stickers and thermal grease was removed, you can see the SSD come from SK hynix, the capacity of 512GB.
Remove three screws securing the wireless card module.
Disconnect the wireless antenna and the yellow flex cable.
There is an audio port on the wireless card board.
The wireless card comes from Intel, the model is 8260D2W.
It is a dual band wireless card and support 802.11ac and Bluetooth® 4.2.
On the back side of the board, you can find some other info: UX390UA IO BD REV 2.0, PCB made in Taiwan.
Remove four screws and disconnect one cable from the board.
Remove the metal shield. You can find some chips on the small board.
Remove all screws cooling fan to the motherboard.
Disconnect the cooling fan cable from the motherboard.
And then take out the heat sink/cooling fan assembly.
The cooling fan comes from Taiwan Delta Electronics.
From the picture can be seen, the fan is really thin, this is the thinnest cooling fan I’ve seen so far
Remove four screws securing the heat sink and remove it.
Intel® Core™ i5-7200U 2.50 GHz Processor (3M Cache, up to 3.10 GHz) with Intel® HD Graphics 620
The ZenBook 3 UX390UA comes with 8GB DDR4 2133MHz RAM onboard, and it is has no spare RAM slot, so you cannot upgrade the RAM.
When the motherboard removed, you can access the backlit keyboard. Replacing the keyboard may be a little difficult.