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iPhone Wi-Fi circuit repairing

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This video mainly explains how to find the iPhone X Wi-Fi signal transceiver 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 maps, first open the iPhone X component map, circuit diagram, and bitmap

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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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If the 2.4G signal is found to be poor during maintenance,

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we need to search for the 2.4G antenna signal and find the damaged components

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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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Let's find the 2.4G upper antenna line first

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In the schematic diagram, the third pin of the Wi-Fi chip is the 2.4G upper antenna

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We search for the signal name, the upper antenna is connected to pin 7 of W2XSW_W

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The chip is an antenna control chip

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Pin 1 is for power supply, pin 3 is for switch control signal,

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pins 4 and 5 are signals for connecting 2.4G lower antenna

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After being excluded in turn, the 8th pin is the output pin of the 2.4G upper antenna

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Pin 8 is connected to the inductor L7704_W,

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we search for the name of the inductor

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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, the signal is connected to the pin 24 of MC_E

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after passing through the inductor

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Jump to the bitmap according to the name,

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this is the location of the MC_E interface

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In the physical picture, MC_E is the flat connection cable on the mainboard

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The inside of the cable is all connected by copper wires,

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and the solder points on the lower side of the cable are connected to the solder points on the upper side

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So when we search for a signal in the schematic diagram,

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we need to search for the opposite signal

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At this time, we search for the signal of pin 1

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The signal of pin 1 is connected to the resistor R2002_E,

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and then connected to the first pin of FLQPLX

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This component is a filter

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The signals on the left are all signals that require an antenna,

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such as low-frequency and intermediate-frequency calls

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The 15th pin is GPS,

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the 5th pin is antenna pin, ANT

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When we use the Wi-Fi function,

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the antenna signal will enter from the 5th pin and be turned on to the 1st pin

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So when looking for the line, we have to continue to look down along pin 5

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The pin 5 signal is connected to the inductor L2009_E,

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and then connected to the 7th pin of JUAT1 after passing through the inductor

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Jump to the bitmap according to the name, after determining the position of JUAT1,

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we can see that JUAT1 is the upper antenna connection seat in the component map

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In this way, we have searched for all the components connected to the line of the 2.4G upper antenna

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When troubleshooting the poor 2.4G signal,

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we can fly the wire directly from the screw post to the Wi-Fi chip, skipping the components

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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