In this guide I’m taking apart a Dell Inspiron 15 3558 laptop (model P47F) for adding more RAM and upgrading from a regular hard drive to SSD. In order to access the original hard drive and memory slots it’s necessary to remove the laptop base cover and keyboard. There is no service hatch on the bottom in this model.
Dell Inspiron 3558 has one SATA connector for 2.5″ hard drives and two memory slots. You can install up to 16GB (2x8GB) DDR3-1600 memory modules.
If this guide doesn’t fit your needs, at the end of this post you will find a link to the official Dell Inspiron 15 3558 service manual.
Removing base cover and keyboard
Remove the battery.
Remove all screws from the base cover.
Pull the CD/DVD drive out.
One screw color-coded in yellow secures the CD/DVD drive. Don’t forget to remove one screw (green) located in the battery compartment.
The keyboard is attached to the top case by five spring-loaded latches located just above the top row keys.
Attention: it is not necessary to remove bottom screws in order to remove the keyboard. If replacing the keyboard is your goal, skip the previous step (except for battery removal).
Insert a thin case opener tool between the keyboard and the latch. The case opener will push the latch inside the case.
Pry the keyboard up to elevate it above the latch. Do the same with all remaining latches.
When all latches are unlocked, continue removing the keyboard with your hands and place it upside down on the palmrest.
Disconnect the keyboard cable from the motherboard.
Lift up the locking tab at a 90 degree angle (red arrow) to unlock the connector. Lift up the cable and pull it out.
Remove five screws located under the keyboard. Disconnect one CD/DVD drive cable.
Attention: while remove the base cover it’s necessary to feed this cable through the opening in the top case.
Start separating the base cover from the top case with the case opening tool. There are multiple hidden latches securing the base cover. Continue removing the cover with your fingers.
Remove the base cover.
Installing new SSD and more RAM
Remove two screws attaching the hard drive caddy to the top case.
Carefully lift up the hard drive assembly and disconnect it from the SATA cable.
Remove four screws (two on each side) securing the hard drive to the caddy.
Remove the old hard drive from the caddy.
Install a new 2.5″ SSD into the caddy and secure it with four screws. Install the SSD back into the laptop.
Remove both memory modules and replace them with new once. I would recommend upgrading RAM to the maximum allowed 16GB.
After the SSD and RAM upgrade assemble the laptop back together following all steps in reverse order. If you need more detailed disassembly instructions, Dell Inspiron 15 3558 service manual available here.