Disassembly/Repair of the mobile device Oppo Reno4 Lite (Oppo Reno4 Lite CPH2125) with each step description and the required set of tools.

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

Use the ejection tool (aka Needle) or Paperclip. Push the tip all the way into the hole until the tray ejects, and then pull the tray of SIM and Memory card (Micro SD) out.

⚠️️ Pay attention! The tool must be inserted into a hole on the edge of the phone's housing. Do not press too hard. It may break the tray eject mechanism.

We recommend using a special heating device such as a separator machine, heat gun, or heating mat. It will simplify the process. You can use a home hairdryer, but you will have to make a nozzle by hand or have a suitable one in the kit to gently heat and concentrate the heat flow in the right place.

ℹ️️ The surface of the back cover must be heated to soften the adhesive underneath. The approximate heating temperature is 50° C / 125° F.

Use a thin plastic film or pick for separation. To facilitate the process, you can use isopropyl alcohol. It is often the most difficult to pass the tool between the parts to be divided. Choose the far edge from the FFC cables or buttons.

We insert it into the gap between the middle cover and the back cover and run it along. As the back cover is detached separately from the cameras cover, the back cover will be glued around the cameras cover.

Using a screwdriver Phillips 1.5 mm (PH#000), unscrew the eight screws.

Using a screwdriver Phillips 1.5 mm (PH#000), unscrew the nine screws.

Using a screwdriver Phillips 1.5 mm (PH#000), unscrew one screw.

If the screws are different: ℹ️️ Be sure to note the location of the screws before disassembling. When assembling the device, screwing the screw in the wrong place may damage the device or its parts. To avoid damage, the removed screws and individual pieces (as gaskets or brackets) must be laid out in the appropriate order, or the screws and their holes in the phone must be marked with colored markers.

And we move on to detach the middle cover, we use a plastic film or plastic tool like spudger.

We run the tool into the gap near the hole for the cards tray and gently run along the detaching clips.

As always, we need to be careful in the area of the side buttons, so as not to damage them and in the area of the cameras.

Disconnect the battery connector as soon as possible. It is better to use a non-metal or plastic tool to avoid any damage.

ℹ️️ The Oppo Reno4 Lite model has a battery BLP779 with 4000 mAh capacity (aka rechargeable battery).

We can remove the cover with the speaker. Carefully hook over the edge and take it out. As we see in the cover besides the loudspeaker there is a vibration motor.

Carefully, preferably from the edge, disconnect the connectors and remove the inter-board cable connecting the mainboard to the daughterboard (also known as the sub-board).

⚠️️ Be careful when removing the cables from the connectors, the cables are pretty thin, and it is easy enough to break them or damage the contact tracks inside.

ℹ️️ An arrow on the FFC cable (flexible flat cable) indicates its correct position.

Let's move on to detach the two front-facing cameras. The cameras are connected by a heat sink film so we have to be careful.

Now we can disconnect the fingerprint sensor cable connector, the coaxial cable connector, the inter-board cable connector, and the display connector.

Remove the sub-board. It may be glued to the frame or attached with attachments like latches or hooks, so be careful.

ℹ️️ The sub-board contains a charging port (Micro-USB), microphone, headphone jack socket, spring contacts for the speaker, vibration motor, and an antenna unit.

⚠️️ It is not necessary to insert the tool underneath when removing the sub-board. Internal components could be damaged.

Let's move on to disconnecting the inter-board cable connector on the motherboard. Then we can disconnect the coaxial cable connector and release the cable from the fixations on the motherboard.

Using a Philips 1.5 mm screwdriver (PH#000), unscrew one screw securing the motherboard.

Using a Philips 1.5 mm screwdriver (PH#000), unscrew the two screws holding the cameras. 

Carefully remove the printed circuit board. There is no need to use a lever or try to reach the circuit board by force. Make sure that nothing is getting in the way or holding the circuit board.

The motherboard, also, may be attached with attachments like latches or hooks, be careful.

⚠️️ 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.

Then we remove the bracket with one rear camera. After that, we detach the larger rear camera. And we can remove the remaining two cameras.

And we move on to detaching the battery. We only have one green tab. We need to unwrap it and pull it upwards.

Under the battery we have a transparent coating that protects the inter-board cable and holds the battery by one edge.

ℹ️️ In the display frame remained: the earpiece speaker, fingerprint sensor, and cables.