Owners of reliable but older models ASUS K55N often face the need for maintenance. Over time, the device begins to make noise, get hot, or work slowly due to clogging of the cooling system and wear of the thermal interface. Independent laptop disassembly allows you not only to extend the life of the device, but also to save a significant amount on the services of a service center.
The process of dismantling the case of this series has its own characteristics that differ from more modern ultrabooks. It uses a classic design with screws under the rubber feet and keyboard latches. If you are planning to spend hard drive replacement to SSD or increase the volume RAM, you will need to be careful and strictly follow the algorithm of actions so as not to break the fragile plastic latches.
Preparing the workplace and necessary tools
Before you start ASUS K55N disassembly, it is necessary to create conditions that eliminate the risk of damage to components. You will need a clean, well-lit surface, preferably covered with a soft material to avoid scratching the body while working. Be sure to unplug the laptop and remove the battery, as working with live internal components is prohibited.
The toolkit should be as suitable in size as possible so as not to strip the screw slots. You will need a set of PH0 and PH1 Phillips head screwdrivers and a plastic spatula or card to pry the latches. It is not recommended to use metal tools, as they can damage the traces on the board or cause a short circuit if moved carelessly.
- 🔧 Phillips screwdriver PH0 for small housing screws
- 🔧 Phillips screwdriver PH1 for hard drive mounting screws
- 🔧 Plastic card or mediator for opening latches
- 🔧 Antistatic wrist strap or gloves
Pay special attention to organizing space for screws. In the model ASUS K55N The screws are of different lengths, and if you mix them up during assembly, the long screw may pierce the motherboard. Lay out the fasteners in sections or take a photo of the location before unscrewing.
⚠️ Warning: Before you begin, be sure to touch any grounded metal object to remove static electricity from your hands, otherwise you risk damaging your sensitive motherboard.
Removing the back cover and expansion modules
The initial stage of disassembly is the simplest, but requires care. Turn the laptop over and unscrew all the screws located on the bottom cover. Please note that some screws may be hidden by rubber feet or serial number stickers. Carefully pry off the stickers with a razor blade if they are blocking access to the fastener.
After removing all the screws, carefully remove the back cover. Do this evenly, prying the cover with a plastic card around the perimeter until you hear the characteristic click of the latches releasing. Do not use excessive force as the plastic may crack. Removing the cover gives you access to the modules RAM and hard drive.
To remove the memory stick, you need to move the metal latches on the sides of the slot apart. The bar itself will rise at an angle of about 30 degrees, after which it can be easily pulled out. If need to replace hard drive, unscrew the screw holding the metal frame and gently pull the device by the special tab.
☑️ Removing the back cover
Removing the keyboard and top case cover
This is the most critical stage, requiring maximum caution. Keyboard in ASUS K55N It is attached not with screws, but with a complex system of latches located along the upper edge. You need to carefully lift the keyboard, starting from the center or edges, and feel the moment the latches release. Do not pull the keyboard up sharply, as it is connected to the motherboard by a cable.
After releasing the latches, lift the keyboard and turn it over to gain access to the cable connector. Open the connector lock and carefully remove the cable. Now you can remove the keyboard completely. If your goal is to clean the cooling system, this step is mandatory, since fans often become clogged with dust through the keyboard grille.
- 🔍 Carefully inspect the latches before prying them off
- 🔍 Use a plastic card to avoid bending the metal keys
- 🔍 Remember or take a photo of the location of the cable
Below the keyboard you will see the top cover of the case, which is also secured with screws. Unscrew them and remove the upper part of the housing. Be extremely careful with the power button and indicators, which are often connected to the board through thin wires. Never remove screws that are under plastic inserts or stickers unless they are marked as removable.
⚠️ Attention: The keyboard cable is very fragile. When disconnecting, be sure to bend the connector lock upward, and do not pull the cable itself, so as not to break the wires.
- Removing the Keyboard
- Disabling loops
- Cooler cleaning
- Replacing thermal paste
Access to the cooling system and motherboard
After removing the top cover, full access to the insides opens. At this point you will see the cooling system consisting of copper heat pipes, radiators and fans. For complete cleaning or replacement thermal paste this unit must be dismantled. First, unscrew the screws that secure the heatsink to the processor and video card, following the order: unscrew them one by one, half a turn, so as not to damage the crystal.
Next, disconnect the fan headers from the motherboard. This is done by snapping off the plastic retainer. After this, carefully disconnect the cooling unit itself. If the cooling system cannot be removed, you may have to remove the motherboard itself, which makes the task much more difficult. In the model ASUS K55N Often it is enough to remove only the radiators.
When removing the board, pay attention to the number of screws holding it in place. Some may be hidden under connectors or metal shields. Disconnect all cables: display, touchpad, speakers and Wi-Fi antennas. Antennas are usually attached through latches that need to be carefully pryed off with tweezers.
Before removing the cooling system, take a photo of the location of the screws and wires so that during assembly you do not confuse anything and do not forget to connect important connectors.
Replacing the thermal interface and cleaning radiators
Old thermal paste dries out over time and turns to stone, no longer dissipating heat. To replace, use a high-quality paste, such as Arctic MX-4 or Thermalright. Clean the surfaces of the processor and video card from any remaining paste using a lint-free cloth and isopropyl alcohol. Apply a new layer of paste in a thin layer, avoiding contacts around the chip.
Radiators are often clogged with dust, especially in hard-to-reach places. Use compressed air or a soft brush to remove dirt. If the radiator is removable, it can be washed under warm water (after it has completely dried), but this must be done extremely carefully so as not to damage the thin fins. Make sure all ducts are clean and air flows freely through them.
- 🧹 Use isopropyl alcohol to clean surfaces
- 🧹 Use compressed air to blow dust out of the radiator
- 🧹 Apply thermal paste evenly, without air bubbles
After cleaning and replacing the paste, reassemble the cooling system in reverse order. Make sure the screws are tightened evenly and tightly, but not overtightened to avoid cracking the crystal. When connecting the fan, check that it rotates freely and does not touch the wires.
A high-quality replacement of thermal paste and cleaning of radiators can reduce the processor temperature by 10-15 degrees, which is critical for stable operation.
Component compatibility table for ASUS K55N
When planning an upgrade, it is important to know which components are supported by a given model. Below is a table with the main characteristics that need to be taken into account when choosing spare parts. An incorrect choice may result in incompatibility and inability to start the system.
| Component | Interface type | Maximum volume | Features |
|---|---|---|---|
| RAM | DDR3L (Low Voltage) | 16 GB (2 slots) | Frequency 1600 MHz |
| Hard drive | SATA 3.0 | 2 TB | Format 2.5 inches, height 9.5 mm |
| Optical drive | SATA | DVD-RW | Can be replaced with a second HDD |
| Wi-Fi module | Mini PCI-E | AC | 802.11ac support |
If you want to install a modern HDD instead of an old one SSD drive, this will give the maximum performance increase. Make sure the SSD you choose is 7mm or 9.5mm thick so it will fit into the bay without additional spacers. You can also replace the optical drive with a second hard drive slot using a special cassette adapter.
⚠️ Attention: When installing an SSD instead of a HDD, be sure to update the chipset drivers and make sure that AHCI mode is enabled in the BIOS for the SSD to function correctly.
Checking functionality after assembly
After all components are installed and the case is assembled, do not rush to launch heavy applications right away. First, turn on the laptop and check whether the hardware is detected correctly in the system. Go to Device Manager and make sure there are no conflicts or missing drivers. Check the processor temperature at idle and under load.
Pay attention to the operation of the keyboard and touchpad. If after assembly the keys are not pressed or the touchpad does not respond, the cable may not be fully connected or damaged. In this case, you will have to disassemble the laptop again and check the connection. Also check that all USB ports and audio jack are working.
What to do if the laptop does not turn on after assembly?
1. Check the connections of the battery and power cables. 2. Make sure the screws are not resting on the board. 3. Try running without RAM to check the POST signals.
If everything is working properly, you can install the necessary programs and update the system. Regular cleaning and maintenance will help your ASUS K55N serve for many years to come. The main thing is to take your time during the disassembly stages and be extremely careful when working with fragile elements.
Proper assembly is just as important as disassembly. Make sure all screws are in place and nothing is loose inside the case before closing the cover.
How to properly remove the keyboard on ASUS K55N without breaking the latch?
The keyboard must be pryed off with a plastic card strictly along the top edge, starting from the center and moving towards the edges. Do not use metal tools as they may damage the case or keys. After releasing the latches, carefully turn the keyboard over and disconnect the cable by lifting the connector latch.
Do I need to disconnect the battery before cleaning the cooling system?
Yes, this is a mandatory safety requirement. Before starting any work on internal components, you must disconnect the battery cable from the motherboard to eliminate the risk of a short circuit if tools accidentally touch the board contacts.
Which thermal paste is best to use for ASUS K55N?
Medium to high viscosity pastes such as Arctic MX-4, Thermalright TFX or Noctua NT-H1 are excellent for this model. They provide good heat dissipation and do not dry out quickly, which is important for laptops with aggressive fan operation.
Is it possible to increase the amount of RAM in this model?
Yes, the ASUS K55N laptop supports the installation of two DDR3L memory sticks with a frequency of 1600 MHz. The maximum supported volume is 16 GB. Make sure to use Low Voltage (1.35V) memory, as standard DDR3 (1.5V) may not be suitable or may cause instability.