These symptoms may include:
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1. Slow charging speed: The fast charging IC is the chip responsible for controlling the charging current and voltage, and if it is broken, the charging speed may be slow or even unable to charge quickly.
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2. Heat when charging: If the fast charging IC is broken, it may cause heat when charging, or even overheating, which may cause damage to the battery and other components of the phone.
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3. Charging failure: If the fast charging IC is broken, it may lead to charging failure, inability to charge or charging interruption.
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4. Abnormal prompt during charging: If the fast charging IC is broken, it may lead to abnormal prompt during charging, such as \"the charger is not supported\
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If the above situation occurs, it is recommended to contact Apple after-sales or professional maintenance personnel for overhaul and repair.