Share iPhone 6 has no external sound whe playing films

1. iPhone 6 has no external sound when playing films
If you run into your iphone 6 no sound when playing
films. You must consider the software issue. The best
resolution approach is to begin by thinking of what the
reason or what has happened to your iphone 6. And from
that, you can proceed with the application of the most
applicable troubleshooting procedures available. Vipprog
sort out some guides to solve the issue, if you have this
situation you can follow this article to do.
Trouble Phenomenon:
External sound suddenly disappeared when the customer
was watching film. He sent it to other maintenance shop
to fix. Although the small audio has been changed and
iPhone has been rooted, the problem is still the same.
Repair Process:
1. The external sound is produced by hand-free speaker.
The problem is mainly caused by no handfree, which is
easy to fix. The relevant components are large and small
audio chips. Customer only sent its motherboard. We

2. assemble it to tester assembly and turn it on to test.
Except the ringtone handfree, other sound from the
speaker and receiver as well as the recording is normal.
The volume button works smoothly. If something wrong
with the volume button, then the problem is very likely
to be caused by the large audio chip.
2. Based on the working principle, the Charge Jack
connects handfree speaker to power amplifier chips. First
measure the diode data to ground of pin 31, 32, 33, 34
which are used by Charge Jack J1817 to connect
handfree speaker. Thus we can judge whether the circuit
between Charge Jack and small audio chip is normal. The
testing pins of J1817 are shown in picture 1-1~3.

3. 3. After measurement, the data is normal. Next, we check
the working condition of audio amplifier as well as the
I2C1 and I2S2 bus of communication circuit between
audio amplifier and CPU and main audio chip. The pins
are shown in picture 1-4.

4. 4. Remove the audio amplifier and measure the diode
data to ground flowing to CPU signal and I2C2 bus
solder pad, as shown in picture 1-5. The data is normal,
which suggests CPU and the I2C2 signal circuit of audio
amplifier are normal.

5. 5. Then, we continue to measure diode data to ground of
I2C2 bus, finding the data of
AP_TO_SPKAMP_I2S2_MCLK cable of pin E7 is
infinite. Pin E7 is shown in picture 1-6. Through circuit
diagram(W014), we know that there is a resistor R0311
between pin E7 and CPU. The schematic circuit diagram
of resistor R0311 is shown in picture 1-7 and its material
object is shown in picture 1-8. Measure the diode data to
ground of its ends. The data is infinite. Thus we know
that the circuits in CPU disconnect or CPU is pseudo
soldering.

7. 6. We have met these problem several times. They all
caused by the faulty I2S2 bus. We need to restore the
CPU. Before removing CPU, we check schematic circuit
diagram again and find that I2S2 bus is also connected to
big audio chip. However, the signal
AP_TO_SPKAMP_I2S2_MCLK is not connected to
large audio chip which uses signal
AP_TO_CODEC_I2S0_MCLK. This signal passes a
resistor R0301 (picture 1-9). The material object of
R0301 is shown in picture 1-10.

8. 7. Jump a wire from R0301 near CPU to resistor R0301
near CPU, sharing the main audio signal
AP_TO_CODEC_I2S0_MCLK, as shown in picture 1-11.

9. Assemble audio amplifier. and turn it on to get into IOS
to test the ringtone, music, film and call. They are
normal.