Primux Alpha 4 - Motherboard

Guide with all the steps necessary to change the motherboard of the Primux Tech Alpha 4 yourself.

Difficulty
1
2
3
4
5

Tutorial: Step by step

Step 1 Primux Tech Alpha 4

Especificaciones:
 
Procesador: Quad Core MTK6582M 1,3 GHz
Memoria Ram: 1 GB
Almacenamiento: Interno 16GB, externo: MicroSD/SDHC hasta 32Gb
Pantalla: 5" IPS/OGS  960x540 qHD
Batería: 1900 mAh/3.7V Polymer Lithium
Sistema Operativo: Android OS versión 4.4 KitKat
Cámara: Trasera 13,0 Mpx Auto Focus, Frontal 1,3 Mpx
Conectividad: Wi-Fi 802.11 b/g/n, Bluetooth 4.0, 2G, 3G: WCDMA/UMTS/HSPA/GSM/EDGE, GPS Interno
 

Before you start, make sure your mobile is turned off.

Step 2 Back cover

Remove the back cover. Using a plastic opening tool will prevent scratches.

Step 3 Battery

Remove the battery by pulling on the bottom.

Step 4 SIM and SD cards

Remove the SIM and SD cards.

Step 5 Intermediate housing

Remove the 11 Phillips screws that hold the middle housing.

Step 6

Disassemble the intermediate housing with the opening tool.

Step 7 Side keys

The volume and ignition keys are not attached, so that when separating the intermediate casing, they will simply come off.

Step 8 Motherboard components

Remove the adhesive covering the connectors on the motherboard.

Step 9 Vibrator and microphone

Remove the microphone and the vibrator from the intermediate housing.

Step 10 Touch screen flex

Take off the touch screen data flex.

Press the connector tab and unplug the flex from the motherboard.

Step 11 Flex de display

Unplug the display data flex on the motherboard, by pulling the connector tab and pulling gently.

Step 12 Volume and ignition pushbuttons

Take off the flex pushbuttons of volume and ignition.

Step 13 Motherboard

Remove the base plate, fastened by 2 Phillips screws.

Step 14 Desoldering components

Use a suitable support to desolder the components of the motherboard.

Remove the Kapton tape that covers the component pins.

Step 15

Protect the components that are not to be desoldered with kapton tape.

Apply a little flux so they melt easily.

Step 16 Rear camera

Point the hot air nozzle to the tin of the pins.

Hold the flex with tweezers and, with great care, pull slowly. The pins will gradually desolder.

Step 17 Front camera

We repeat the process with the front camera. We add a little flux and aim the air jet at the flex pins.

Step 18 Sensors and push buttons

Also de-solder the light and proximity sensor, as well as the flex pushbuttons of volume and ignition.

Step 19 Vibrator and microphone

Finally, we desoldered the microphone and vibrator. To do this apply heat with the tip of the soldering iron to the tin while gently pulling the cable.

Video Tutorial summary

In this video you can watch a quick summary of the tutorial, but we recommend to follow the complete tutorial, with its explanations and detailed images.
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