{"id":13137,"date":"2022-06-10T11:41:00","date_gmt":"2022-06-10T03:41:00","guid":{"rendered":"https:\/\/rewa.tech\/mate-30-crack-into-halves\/"},"modified":"2024-05-10T14:46:15","modified_gmt":"2024-05-10T06:46:15","slug":"mate-30-crack-into-halves","status":"publish","type":"post","link":"https:\/\/rewa.tech\/de\/mate-30-crack-into-halves\/","title":{"rendered":"HUAWEI Mate 30 Riss in H\u00e4lften Schaden Reparatur"},"content":{"rendered":"

HUAWEI Mate 30 Crack into Halves! Whether this phone can be fixed or not?<\/p>\n<\/p>\n

\"\"<\/p>\n

Modell:<\/strong> HUAWEI Mate 30<\/p>\n

Angek\u00fcndigt:<\/strong> 2019, September<\/p>\n<\/p>\n

Customer’s Feedback<\/h2>\n

The client was drunk and break the phone into halves in an unconscious state.  And when woke up the next morning, only the upper half (with the motherboard inside) of the phone can be found. <\/p>\n

Seems it’s not the first phone issue caused by the drunk client.<\/p>\n

\"\"<\/p>\n<\/p>\n

Fehlersuche<\/strong><\/h2>\n

No matter why and how the phone gets damaged like this, let’s have a check the motherboard first.<\/p>\n

Remove the screws and take out the motherboard<\/p>\n

\"\"<\/p>\n<\/p>\n

The motherboard looks good, no obvious deform or damage<\/p>\n

\"\"<\/p>\n<\/p>\n

Connect the motherboard with the DC power supply, trigger to boot<\/p>\n

\"\"<\/p>\n

The boot current jumped from 100mA to 40mA and was then fixed at 40mA<\/span><\/p>\n

\"\"<\/p>\n

This defect phenomenon with a high chance is caused by the CPU power supply or the CPU dos not work.<\/p>\n<\/p>\n

Reparatur-Prozess<\/h2>\n

Remove the shielding cover on the CPU chip and check carefully, the CPU looks fine.<\/p>\n

Touch the small inductors around the CPU chip with the tweezers slightly to check. After checking, there is no component loose or missing.<\/p>\n<\/p>\n

Check the other side of the motherboard. The shielding cover on the PMU IC has gotten deformed, let’s remove the shielding cover and have a check<\/p>\n

\"\"<\/p>\n<\/p>\n

PMU IC looks good and the small components around it are also in the good conditions<\/p>\n

\"\"<\/p>\n<\/p>\n

A small inductor is loose and easy to be removed when pushing with the tweezer<\/p>\n

\"\"<\/p>\n<\/p>\n

However, based on the repair experience, the small inductor missing won’t cause 40mA no boot issue.<\/p>\n

Anyway, let’s solder it back to position first.<\/p>\n

\"\"<\/p>\n<\/p>\n

After soldering back the small inductor and testing again, the issue is still the same (boot current fixed at 40mA).<\/p>\n<\/p>\n

Will the issue be caused by the CPU power supply? Let’s connect the DC power supply and measure the voltage values.<\/p>\n

\"\"<\/p>\n

All the voltage values are OK.<\/p>\n<\/p>\n

So the issue might be caused by the poor connection of the two layers of the motherboard or the CPU.<\/p>\n

Let’s resolder the CPU to have a try first.<\/p>\n