In this tutorial I explain how to disassemble a Lenovo IdeaPad S340-15API Touch laptop (model name 81QG).
You can use these instructions for taking apart many other models in the Lenovo IdeaPad S340 computer line. All disassembly steps should be very similar for 15″ and 14″ models 81N8, 81QF, 81N7, 81NC, 81NB.
You will need only basic repair tools for this disassembly: Philips screwdriver #0 or #1, tweezers and case opening tool. For your convenience at the end of this guide I published a link to the official service manual.
Base cover and battery removal
Remove nine regular screws and loosen one captive screw located on the base cover. In some models there is no captive screw installed.
Insert the case opening tool between the base cover and the top case assembly. Pry up the base cover and start separating it from the top case.
Continue removing the base cover with your hands.
Remove three screws attaching the battery to the case.
Lift up the battery and disconnect the cable from the motherboard.
Lenovo IdeaPad S340-15API Touch laptop battery model name: L18L3PF3.
Hard drive and memory removal
Lenovo IdeaPad S340-15API has two storage drive interfaces: SATA (for 2.5″ hard drives) and M.2 PCIe (for PCIe NVMe solid state drives). In this particular laptop I had a regular 2.5″ hard drive installed. You can see an empty PCIe M.2 slot located just above the 2.5″ drive.
Remove four screws securing the hard drive bracket. Slide the hard drive assembly away from the motherboard to disconnect it from the SATA port.
I’m not going to remove the drive because there is a warranty seal on one of the screws and the laptop is still under warranty.
The memory module located under the metal cover. There are a few clamps attaching the cover to the motherboard.
Carefully start separating the memory cover. I’m using tweezers for that.
Lift up and remove the memory cover.
Lenovo IdeaPad S340-15API has 4GB soldered RAM and one memory slot available for upgrades. This laptop can take up to 16GB DDR4 memory module in the expansion slot.
Total RAM for this model is 20GB (4GB soldered + 16GB removable).
Remove the memory module.
The display cable is routed in the guided path on the fan side. The display cable has to be separated from the fan before it can be removed.
Unplug the display cable connector from the motherboard.
There is a back tab on the top of the connector. Pull the connector up to disconnect it from the motherboard.
Separate the display cable from the fan. Remove two screws attaching the fan to the case. Disconnect the fan cable from the motherboard.
Remove the fan.
Display panel removal
Separate self-adhesive sponge covering the wireless card antenna cables.
Disconnect both antenna cables from the wireless card.
Open the display 90 degrees and place the laptop upside down on the edge of your desk as it shown on the following picture. Remove four screws securing the display hinges to the top case assembly.
Now you can separate the top case and remove the display panel.
DC jack, I/O board and motherboard removal
The DC power jack mounted under the left display hinge. By the way, it is not necessary to remove the display panel completely in order to access and remove the DC jack. You can simply remove two screws from the hinge and lift it up just enough to remove the DC jack.
Unplug the DC jack cable from the motherboard and remove it.
Remove one screw securing the I/O board which has the power button, USB ports and media card reader. The CMOS battery also connected to the I/O board.
Peel off black mylar tape attaching the I/O board to the case.
Lift up and remove the I/O board.
The power button is soldered to the I/O board.
Remove three screws securing the motherboard. Disconnect the following color-coded cables:
– I/O board cable (pink).
– Keyboard cable (yellow).
– Touchpad cable (green).
– Speaker cable (blue).
After that you can separate the motherboard from the top case and remove it.
NOTE: on the following picture the hard drive is still connected (for warranty purposes) but it must be removed in order to remove the motherboard.
Lenovo IdeaPad S340-15API keyboard is permanently attached to the top case and cannot be easily removed unless you want to try this keyboard removal hack.
The official Lenovo IdeaPad S340 Series service manual available here. It’s the same manual for model names: 81N8, 81QF, 81N7, 81NC, 81QG, 81NB.