Disassembly/Repair of the mobile device Samsung Galaxy А15 SM-A155 (Samsung SM-A155F, SM-A155F/DSN, SM-A155M, SM-A155M/DS, SM-A155P, SM-A155R) with each step description and the required set of tools.

⚠️️ Before disassembling, do not forget to turn your phone off.

First things first, we need to remove the SIM card tray. Use a SIM ejector tool for this — just insert it into the hole and gently push to pop the tray out. If the tray is stuck, you can carefully use a pair of tweezers to assist.

Next, we need to heat the back cover to around 70°C (160°F). We're using a heating pad, but a hairdryer works too.

After heating for about 5–7 minutes, we can start separating the back cover. To begin, use a thin, firm tool to get underneath the edge of the back cover and create a small gap. Then switch to a thin plastic film to safely slice through the adhesive.

Avoid using metal tools here — you risk damaging the cover edges.

Gently slide the plastic film along the edges to cut the adhesive and lift the back cover.

Be especially careful around the camera area and the fingerprint sensor cable.

Use a 1.5mm Phillips screwdriver (PH#000) to unscrew the eight screws at the top.

Use a 1.5mm Phillips screwdriver (PH#000). Unscrew the seven screws carefully and place each screw on a magnetic mat or tray in a pattern so you can reassemble correctly later.

If any screws are hard to remove, you can magnetize the screwdriver or use tweezers to pull them out once loosened.

Notice how the antenna lines near the bottom are now made of denser material and slightly recessed — making them harder to accidentally damage when removing the back cover.

So we disconnect the fingerprint sensor before removing the midframe.

Next, we remove the midframe. Insert a thin plastic tool into the gap between the midframe and the display frame near the SIM tray area, and start unclipping it.

Once a few clips are loose, you can switch to a slightly thicker plastic tool.

Go around the edges carefully, unclipping the frame as you go. Be extra cautious at the corners, where the frame tends to hold more tightly, and avoid pressing against the edge of the display to prevent damage.

Once the clips are released, remove the midframe.

On the midframe, there's antenna contacts and the lower speaker module.

Let’s disconnect the battery. Use a non-metallic tool — we’re using ceramic-tipped tweezers to safely detach the battery connector.

ℹ️️ The Samsung Galaxy А15 SM-A155 model has a battery EB-BA156ABY with a capacity of 5000 mAh (also known as a rechargeable battery).

Next, we recommend covering the camera lenses with protective film to avoid getting dust or debris on them during the teardown.

Once all the lenses are covered, we can continue.

Disconnect and remove the two rear cameras, and set them aside.

You can also disconnect the front camera.

It’s a good idea to protect the front camera lens with film as well, to avoid damage during disassembly or reassembly.

Disconnect the interconnect flex cable from both the mainboard and the sub-board, and move the cable aside.

Note that the cable has a directional arrow pointing toward the mainboard.

Now, disconnect both coaxial cables and gently unclip them from their holders on the sub-board.

Detach the display flex cable connector, which is glued to the sub-board — lift it gently by the edge and peel it off slowly.

Then, remove the one screw holding down the sub-board using the same 1.5mm Phillips screwdriver. This screw is different from the others, so keep it separate.

Carefully lift and remove the sub-board.

On it, we have the charging port, microphone, headphone jack port, and some components on the reverse side.

Next, disconnect the two coaxial cables from the mainboard.

Then, remove the screw securing the mainboard using the same Phillips screwdriver.

Carefully set the screw aside.

Now gently lift and remove the mainboard — find the right edge to lift from, take it out, and flip it over.

⚠️️ Do not bend the circuit board when removing it or push tools under it. Unbeknownst to yourself, you can damage components or cables from the inside.

Here, disconnect and remove the third rear camera, then set it aside.

Finally, we’ll remove the battery. As with recent Samsung models, there’s a blue pull tab — fold it up carefully.

You’ll also notice clear adhesive on the sides, which you should peel back to avoid interference.

And, gently pull the blue tab straight up. Watch for any resistance from the side adhesive, and continue pulling until the battery comes free.

Under the battery, there's a transparent adhesive protective layer.

ℹ️️ In the display frame remained: the earpiece speaker, vibration motor, and cables.