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iPhone Wi-Fi circuit repairing

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This video mainly explains how to find the 2.4G and 5G upper antenna of iPhone XR

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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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When checking the maps, first open the component map, circuit diagram, and bitmap of the iPhone XR

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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 block diagram, 2G_ANT_CORE0 represents the 2.4G upper antenna

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5G_ANT_CORE0 represents 5G upper antenna

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2G_ANT_CORE1 represents the 2.4G lower antenna

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5G_ANT_CORE1 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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If we find that the 5G signal is relatively poor, we need to find the 5G lines

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The pin 49 of the Wi-Fi chip is 5G upper antenna

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Search for the name of the upper antenna,

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the 5G upper antenna connects to W5BPF after passing through the resistor R7706_W,

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and connects to the resistor R7707_W

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It connects to pin 6S of U1900_K after passing through the resistor

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Jump to the bitmap according to the name,

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after determining the position of U1900_K,

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we look up the component map

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U1900_K is the flat connection antenna on the mainboard

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The antenna is connected internally through the copper wires,

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and the solder points on the lower layer will directly communicate with the solder points on the upper layer.

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So when looking up the picture, we need to find the pin opposite the antenna,

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and search for the 6N pin

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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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After searching, the signal is connected to the resistor R7708_W,

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and after the resistor is connected to DPLX30_W

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Pin 6 of the component is a low-frequency signal,

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and pin 2 is a common port of the COM port

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When looking for the signal, continue to search from pin 2

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The pin 2 signal passes through the resistor R7710_W

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Continue to search by the name

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The signal is connected to pin 6 of JUAT_A

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Jump to the bitmap according to the name, after determining the position,

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we look up the component map

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In the component map, JUATA is the upper antenna connector

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In this way, we have searched all the components from the Wi-Fi chip to the upper antenna connector

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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