Smartphone Radio Frequency Circuit Repair Skills

Course one: The establishment of smartphone RF circuit corresponding relationship.

Project one: Characteristics of Smartphone RF Circuits

RF circuit components in the smartphone main circuit board location is more concentrated, usually located on the upper side of the smart phones main circuit board side. The following figure is the illustration of the Nokia N95.

Video antenna is a common part of the smart phone to receive and transmit signals, usually fixed in the form of modules near the RF circuit.

Some phones, in order to avoid interference from outside signals, usually the RF circuit (part or al l) in the shield.

Project two: Smart phone radio circuit circuit comparison

In the establishment of the corresponding relationship between the smart phone RF circuit, we need to combine the circuit object, component installation diagram and circuit schematic, to find the general location of the main components in the circuit. Then, take the core components as the center, along the signal flow, delineate the scope of the unit circuit.

1. Circuit comparison of RF signal transceiver circuit. 

The following figure shows a typical smart phone RF signal transceiver phone circuit diagram, the physical circuit board and component installation diagram in contrast to find the component model, and then found in the circuit schematic component location, the division of the circuit range.

2. the circuit control of RF power amplifier circuit.

The following figure shows a typical smart phone RF power amplifier circuit control chart, RF power amplifier circuit identification is N7540, model is RF3278E4.1.

3. RF signal processing chip circuit control.

The following figure is a typical smartphone RF signal processing chip circuit diagram.

As can be seen from the diagram, the circuit of the radio signal processing chip is labeled N7505, and the model is AHNE301A

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