Fault diagnosis and fixes

Symptom by symptom: what it means, what you can check yourself and when a repair is really needed.

Battery drains fast — is it really the battery

Fast drain does not automatically mean a new battery. Check battery health first, then which app is eating the charge.

In most cases the cause is the cheapest one: the cable or a dirty port. Check in this order before thinking about repair.

A thin vertical line on an AMOLED screen almost always means a damaged display, not software. Here is how to confirm.

A warm phone while gaming or charging is normal. A hot phone in your pocket with nothing running is not.

Before thinking about a speaker replacement: check whether the phone is stuck in headphone mode and whether the speaker mesh is blocked.

In most cases it is not a defect but lost sync between the two earbuds. A reset fixes it, no repair needed.

The cause is almost always a Bluetooth profile left over from an old pairing. It must be deleted on both sides, not just one.

The first minutes decide. Rice, a hair dryer and trying to switch it on are the three things that make it worse.

A black screen does not mean a dead phone. A forced restart solves a large share of cases — if done correctly.

If the problem started right after an update, it is almost certainly a saved network setting, not the antenna.