Troubleshooting iPhone X Ringtone Issues Due to Pseudo Soldering

Pseudo-soldering components may result in multiple problems on an iPhone. This soldering issue of chips may be related to several reasons:

1. Manufacturing defect when leaving the factory;

2. Misoperation when running a logic board repair;

3. Bad habits of its users etc.

This time we will share you with an iPhone X no ringtone sound repair case caused by pseudo soldering of the motherboard after being dropped.

The phone features a broken screen and a deformed housing.

Get a new display assembly installed and test.

The phone turns on normally.

After a series of tests, we found out that there is no output sound when selecting a ringtone.

Yet the sound works fine with a headphone plugged in.

The preliminary judgment is that the audio circuit is in normal condition.

It’s just that the bottom speaker is not working.

Remove the display assembly and disconnect the battery.

Disconnect the charging port flex cable.

Run diode mode measurement of the DOCK connector.

Il valore misurato è normale.

Which indicates that the bottom speaker is in normal condition.

Run diode mode measurement

Continue to measure the connector on the motherboard.

The relevant circuit of one Pin has been open-circuited.

measure the connector on the motherboard

Remove the upper layer with a Hot Air Gun.

There are multiple missing pins on the upper layer.

Judging by this, the phone has been dropped.

Which resulted in pseudo soldering of the motherboard and detachment of pins.

Remove tins on cylinders and bonding pads of the upper layer.

Pulire poi con PCB Cleaner.

Remove tins on cylinders and bonding pads

Run diode mode measurement of Pin S162 and Pin S163.

Il valore misurato è normale.

Judging by this, the open-circuited condition is caused by the pseudo soldering of cylinders around the edge of the lower layer.

Get the motherboard installed to the testing kit and test.

The current reading on the ammeter is normal.

Go to Settings>Sounds&Haptics>Ringtone.

Select a default ringtone.

Normal output sound this time.

We can confirm now that the fault is caused by the pseudo soldering of cylinders around the edge of the lower layer.

Now we can solder the two layers together.

Before soldering, treat Pin S166 with jumper wiring.

Next, let’s get the lower layer rebelled.

And re-solder the motherboard.

Assemble the phone and test. Go to Settings>Sounds&Haptics>Ringtone.

Select a default ringtone, normal output sound this time. Fault cleared.

Attaching the video for more details about the iPhone X Bottom Speaker Not Working Repair – Pseudo Soldering

Strumenti utilizzati:

• Comunicazione Manutenzione Alimentazione
• Stazione di rilavorazione digitale con saldatore
• Digital Hot Air Rework Station – 861DW
• Piattaforma integrata per la riparazione dei telefoni cellulari
• Logic Board Tester for Apple iPhone X
• Multimetro digitale* Multifunctional PCB Holder for iPhone X
• Pinzetta dritta
• Pinzetta a gancio curvo
• Pasta saldante fluida per strisce BGA
• Flusso di saldatura alla colofonia di elevata purezza
• Riparazione dei disegni
• Raschietto BGA in acciaio inox