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iPhone Wi-Fi circuit repairing

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This video mainly explains how to find the iPhone 12 Pro Max Wi-Fi 2.4G or 5G antenna line

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Step 1, find the Wi-Fi location number in the component map

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Step 2, search for the Wi-Fi location number in the schematic diagram

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Step 3, find the corresponding antenna pin in the schematic diagram

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Step 4, search for the pin identification in the schematic diagram,

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find the connected components, and finally find the antenna screw post

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We can also jump to the bitmap according to the name to view the connected components

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When checking the picture, we first open the 12 Pro Max component map, circuit diagram, point map

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Find the Wi-Fi location number in the component map

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Then search for the Wi-Fi location number in the schematic diagram

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After finding the Wi-Fi chip, find the corresponding signals

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In the functional block diagram, 2G_C0_ANT represents the 2.4G upper antenna

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2G_C1_ANT represents 2.4G lower antenna

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5G_C0_ANT represents the 5G upper antenna

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5G_C1_ANT represents the 5G lower antenna

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When the mobile phone is searching for a signal,

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it mainly relies on the upper antenna to search for the signal,

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and the lower antenna is only an auxiliary function

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When we check the weak Wi-Fi signal,

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we only need to find the signal of the upper antenna, and there is no need to search for the lower antenna

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Let's find the 5G upper antenna line

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Pin 28 of the Wi-Fi chip is the 5G upper antenna line

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It is connected to the resistor R237_W

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and connected to FL_ISG_U_W

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This component is a filter

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After passing through the filter, the line is connected to the resistor R201_W

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After passing through the resistor,

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we search for the signal name at the back end of the resistor

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In the schematic diagram, the box that does not identify the coordinates of the pin is the signal conversion box,

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we do not need to check

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Continue to search down

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The signal is connected to the resistor R363_W

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It is connected to pin 20 of U_5G_U_W after passing through the resistor

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The chip is an antenna filter

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The upper pin is the power supply pin,

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The lower left part is detection and control signals

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When looking for the line, we need to continue to look down from the ANT pin of the chip

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Pin 26 of the chip is the antenna pin, ANT

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After the 26 pin comes out, it is connected to the resistor R365_W,

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and after passing through the resistor,

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it is connected to the filter DPLXR_U_W

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After passing through the filter, the signal is connected to the resistor R301_W

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After passing through the resistor, we search for the signal at the back end of the resistor

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After searching, it is connected to pin 11 of JUAT1

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Jump to the bitmap according to the name,

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after determining the position of JUAT1, we look at the component map

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In the component map, JUAT1 represents the upper antenna connector

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In this way, all the components connected to the 5G upper antenna line are searched

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When troubleshooting the weak 5G Wi-Fi signal,

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we can fly a wire from the Wi-Fi antenna pin to the screw post

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If the Wi-Fi signal is still poor after flying the wire,

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it means that the Wi-Fi chip is damaged

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Ok, that's all for this video