Come risolvere il problema dell'avvio dell'Honor 20 Pro: Guida completa alla riparazione passo dopo passo

Start by heating the phone on a piattaforma di riscaldamento to soften the adhesive. This will allow you to carefully remove the back cover.

Using a precision screwdriver, remove the screws one by one. Be sure to handle the screws carefully to avoid stripping or damaging them.

After the screws are removed, gently take out the motherboard for inspection. Upon inspection, you might notice that this phone had already been repaired. Unfortunately, in this case, the previous repair job was not done properly.

Start by desoldering and removing the poorly installed NFC chip. After removal, clean up the PCB pads to ensure proper reinstallation later.

Connect the motherboard to a DC power supply and attempt to boot the phone. Use pinzette to trigger the boot process. If you notice the current pointer fluctuating, it likely indicates a current leak on the second power supply rails.

Reapply power and inspect the motherboard with a thermal camera. You’ll want to look for any abnormal hot spots that indicate where the short or leakage is occurring.

Apply rosin to the hot area to pinpoint the exact faulty component. Connect the DC power supply, and the rosin will react when exposed to the short circuit heat, revealing the damaged part.

Upon locating the issue, remove the filter capacitor. In this case, the small inductor nearby is also damaged, so you’ll need to replace it as well.

Even if the new inductor looks slightly different from the original, as long as the specifications match, it should function properly.

After replacing the damaged components, reconnect the Alimentazione in c.c. and attempt to boot the phone. The phone should now boot normally.

Before reconnecting the battery, measure the battery voltage to ensure it’s within acceptable limits. Once confirmed, reconnect the battery, and test the phone again. At this stage, the phone should be booting and charging correctly.

With the phone booting normally, take this opportunity to back up the client’s data before proceeding with the NFC chip repair.

To fix the NFC issue, source a donor motherboard of the same model. Carefully desolder the NFC chip and surrounding components from the donor board, then solder them onto the damaged motherboard.

After all components are soldered properly, reassemble the phone, and don’t forget to replace the missing shielding covers.

Boot the phone one last time and test all functions, including the NFC. If everything works correctly, the repair is successful.