How to Fix iphone 6s plus Volume Button can’t Work

vip_fixphone
Jul 20, 2017 · 3 min read

Phone is the necessary at our life. Several users have reported that volume buttons on the side of iPhone do not work, meaning their iPhone 6s is not responsive when they want to lower or raise the volume. Follow these steps to troubleshoot volume issues on your iPhone 6s. Please note that after performing each step, please test to see if your iPhone 6s volume control problems is resolved.

Trouble Phenomenon:
The volume button is not workable and has not been recovered.
Repair Process:
1. After checking circuit diagram, we find that volume button interface J4701 has three signal circuits, namely, volume up, volume down and mute switch. The circuit diagram of J4701 socket is shown in picture 1–1.

2. Measure the voltage of pin 2,4 and 9 of J4791. The voltage of volume up signal pin 4 BUTTON_VOL_UP_CONN_L is 0.6V while the voltage of volume down signal pin 4 BUTTON_VOL_DOWN_CONN_L and voltage of mute signal pin 9 BUTTON_RINGER_A_CONN are 1.8V. After checking circuit diagram, we find that the three signals do not have pull-up resistors, which suggests that CPU offer the pull-up voltage. Deenergize volume button interface J4701 and measure the diode data of the four pins of J4701. The data is normal. The low voltage of volume up signal BUTTON_VOL_UP_CONN_L could be caused by electric leakage from some components on this signal circuit. Capacitor C4713, voltage-regulator diode DZ4713 and CPU U0201 are connected with this signal, as shown in picture 1–2. The material object is shown in picture 1–3.

3. The showing data indicate that CPU is not pseudo soldering. Remove the capacitor C4713, voltage-regulator diode DZ4713 and measure the voltage of volume up signal BUTTON_VOL_UP_CONN_L. The voltage remains the same. The diode data is normal. The voltage is abnormal even after some parts are torn, which is obviously caused by a damaged CPU. We cannot replace the CPU, but we can add a pull-up voltage at the outside of CPU. After checking circuit diagram, it is the most convenient to gain voltage from compass. Connect a 1kΩresistor at the 1.8V end of capacitor C3000. Jump a wire from the other end of the resistor to the un-grounded end of C4712, as shown in picture 1–4.

4. After the above steps, we measure the voltage of volume up signal BUTTON_VOL_UP_CONN_L. The voltage is 1.76V. Assemble the motherboard to tester assembly, cover the volume cable and turn on to test. We can adjust the volume normally. Trouble is removed.

)

Written by

Vip Fix Shop Team is come up with a list of the most popular tools used in successful DIY mobilephone & tablet repair projects.

Welcome to a place where words matter. On Medium, smart voices and original ideas take center stage - with no ads in sight. Watch
Follow all the topics you care about, and we’ll deliver the best stories for you to your homepage and inbox. Explore
Get unlimited access to the best stories on Medium — and support writers while you’re at it. Just $5/month. Upgrade