May.26
iPhone 6 touch function is completely lost after dropping
Sometimes, we may come across the iphone or phone fall down and unfortunately the touch screen is not working. If you want to fix it and need some help, you can read this article. Hoping you will benefit from it.
Trouble Phenomenon:
American customer’s iPhone 6 has been dropped and the front cover glass has broken. The touch function is lost even after replacing a fine LCD screen.
Repair Process:
1. First replace the old screen with a fine LCD screen and test. The touch function cannot be used, which suggests the problem existing on motherboard. Take out motherboard and check, as shown in below picture.
2. As the touch function is lost, we check the touch circuit directly. First measure the diode data of communication coupled capacitor between touch process chip and touch control chip, finding no problem. The coupled capacitor’s location is shown in below picture.
3. When measuring I2C chip bus, find the diode data of TOUCH_I2C_SCL is several tens. The normal one should be over 300 and the clock should be the same as data. Generally, the low diode data is caused by short circuit. The main chip of this signal is only the touch chip. The circuit diagram of I2C chip bus of touch chip.
4. According to the experience, the damage of touch process chip will cause the failed usage of touch function in addition to the short circuit. Thus, we decide to remove the touch process chip, as shown in below picture.
5. After removing it, the diode data of the two bus circuits of I2C chip are the same, which becomes normal. We know the touch process chip is damaged now. Replace the touch process chip and the trouble is removed.
Posted by: fixphone at
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