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In this lesson, we will talk about the power amplifier

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The power amplifier power supply is mainly to change the battery power supply

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into the voltage required for successful chip operation

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What is a power amplifier chip?

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The power amplifier chip is the chip that

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the mobile connection line passes through when we make a call

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The main purpose of these chips is to amplify the signal

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so that the base station can pick up the signal sent by the phone,

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or the signal sent by the base station to the phone

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There are more power amplifiers in Apple models,

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and their power supply is provided by power amplifiers

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Its power supply output mode is step-down output,

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it will according to the strength of the mobile phone signal,

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the battery power supply into different voltage,

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provided to the power amplifier chip

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In places with strong signals, such as cities,

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the voltage is very low, only a few tenths of a volt or so

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Where the signal is weak, the voltage value will be higher,

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up to the same as battery power

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For example, when we climb the mountain,

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the signal is weak, we can feel the mobile phone heat,

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and the power consumption is fast

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This is when the power amplifier chip is working,

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and to amplify the weak signal for the cell phone's base station to pick it up,

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it needs electricity

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So when climbing the mountain, the signal is weak,

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the mobile phone will heat up and use up power quickly

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Power amplifier power supply is usually near the power amplifier chip,

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the surface is black or silver, like this rectangular

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Among iPhone models,

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models prior to the iPhone 11 had only one power amplifier

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Because they don't support 5G,

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the power amplifier chips don't consume as much power when they work

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Series 12 and later support 5G network

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But 5G's signal has a drawback,

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it covers a relatively small area

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In order for a phone's 5G signal to be picked up by a base station,

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it needs to be amplified and it needs to consume power

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The early models had only one power amplifier,

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which could not meet the voltage needed for the power amplifier chip to work

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So models starting with the iPhone 12 will typically have four power supplies

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The power amplifier power supply damage will cause the mobile phone signal weak,

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and even there will be no service and other problems

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When we replace, we need to replace with the same model

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Let's go to the real mainboard to see the power amplifier power supply

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This mainboard is from the iPhone 7,

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and its power amplifier is in this position, long and white

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This mainboard is an XR model, it has only one power amplifier,

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in this position, it is black

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This chip is the XR power amplifier chip

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In the two-layer mainboard,

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the power amplifier power chip will be in the lower layer

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This mainboard belongs to the iPhone 11

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Its power amplifier is near the wifi, and it is rectangular

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This is the power amplifier chip of 11

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Ok, that's it for this lesson