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iPhone trigger circuit

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In this video we're going to learn about the no trigger repair process

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We are going to repair from the simple to the complex step by step

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No trigger maintenance process 2

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After removing the switch cable,

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we can first measure whether the switch pin's diode value is normal

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If we measure the value is low,

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it is generally the circuit connected capacitor damage, diode damage

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After excluding capacitors and diodes,

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if the value is still low, it indicates that the power IC or CPU is damaged

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Let's take the iPhone 6 as an example to measure the switch pin's diode value

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We found the switch pin on the bitmap

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We can see that there is a reference value on the switch pin

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If we measure a low value,

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it means that the components connected to the pin are damaged

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The pin will connect to DZ0810

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on the reverse side of the mainboard and then to FL0809

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After the inductor it will connect to the C0810,

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it will also connect to the power IC and CPU

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If we measure the value is low,

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we will first remove DZ0810 and C0810

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After the two components are removed,

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if the value is still low,

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it indicates that the power IC or CPU is damaged

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Now let's measure the switch pin's diode value

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The normal value is around 500

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If we measure the value to 0,

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it means that the components connected to the pin are damaged

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According to the circuit diagram, the switch pin of the iPhone 6 is connected to a diode,

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connected to an inductor, and connected to a capacitor

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If the value is low,

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it indicates that the diode or capacitor connected to the line is damaged,

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so we need to remove the diode and capacitor

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If the measured value is high,

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it means that the fuse of the line connection is broken,

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or it is caused by the broken line of the mainboard

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Because the values we measure are the values of the chip

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If the circuit or fuse between the switch pin and the chip is damaged,

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it will result in a high value measured

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So let's go to measure in the real mainboard

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The normal value of the switch pin is about 500

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If the value of the switch pin is OL or 1,

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it indicates that there is a problem in the line between the switch pin and the power supply

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According to the circuit diagram,

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we know that there will be an inductor between the switch pin and the power supply

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We can measure the value of this side of the inductor

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If the value on this side of the inductor is normal,

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it means that there is an open circuit between the switch seat and the inductor

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If the value of the inductor is not normal,

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it indicates that the power supply IC board layer is disconnected to the inductor

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From the inductor to the power IC,

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we can see the position of the pull-up resistor

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At this time, the pull-up resistor is relatively close to the power IC

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By the way, we can test whether the pull-up resistor position has a value

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If the pull-up resistor has a value and the inductor has no value,

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then the line between the pull-up resistor and the inductor is broken

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At this point we can fly a line to the inductor at this point in the pull-up resistor

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In this way, there is no need to remove the power IC

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to connect the broken wires of the board layer

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So that's it for this lesson