How to work APT ic in network section|| 4G PFO APT (VPA) voltage trassing || bypass APT ic

Bypassing an APT (Antenna Tuning Processor) IC in a smartphone, especially in Qualcomm-based devices, can be tricky and risky. The APT IC is responsible for optimizing the antenna's performance for better signal reception and transmission. A bypass might be needed if the IC is damaged or causing issues, but doing so can result in degraded network performance, increased power consumption, and potential harm to other components.
Ensure the issue is genuinely with the APT IC. Use tools like a multimeter, schematics, and service manuals to verify
Use the device’s schematic diagram or service manual to locate the APT IC.
Common Qualcomm APT ICs are QFE series (e.g., QFE1100, QFE3320).
Trace the RF (radio frequency) signal paths from the antenna to the APT IC and then to the RF front-end module (FEM) or baseband processor.
Identify the input and output signal pins on the APT IC.

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