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In this lesson, let's learn the maintenance steps of no touch faults

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When repairing no touch, first replace a display screen to rule out whether it is a screen problem

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Because the display contains a touch screen, we directly replace it with a good display

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After replacing the screen, if the touch is normal,

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it means that the touch screen is damaged and the touch fails

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Replacing a good screen fixes the problem

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There will also be such a situation,

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that is, after replacing the screen, the touch screen still does not respond

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We can confirm that this is caused by a circuit failure on the mainboard

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At this point we are going to the next step

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Find the touch connector on the mainboard and measure the diode value of the pins related to the touch circuit

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When measuring the ground value, the multimeter is set to the diode range,

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the red marker is grounded, and the black marker is used to measure

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We need to measure the diode value of power supply and signal

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Next, I will take Xiaomi 11 as an example to demonstrate

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We first need to find the touch connector

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Enter TP_RESET to search

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If we cannot find it, we search for another code starting with TS

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This way we can find the touch circuit

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TS is touch, TP is also touch

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This is the code name for reset

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If you find the touch reset, you can find the touch connector J6503

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That's all for this lesson