How to fix iPhone 6 speakerless sound
The customer said that his iPhone 6 had no sound when answering the phone and there was no sound when playing music on the speaker. Why is this happening, how to fix it?
After receiving the iPhone 6, we turned on the power. Then go to Settings - Sounds - Ringtones. Select one from the list. The iPhone 6 has no speaker sound. Everything works fine when you plug in the headphones, which indicates the normal state of the iPhone Audio IC. Therefore, the fault may be related to the speaker and audio power amplifier circuitry.
Repair Process
Disassemble the phone and measure the resistance values of 1# and 2# on the flexible cable connector of the charging port. The normal resistance value indicates a normal speaker buzzer.
Continue to measure the resistance between 1#J1817 and ground, 2# with digital multimeter, the value of current is normal, which indicates the circuit from the charging port connector to the U1601 is also normal.
Take out the logic board and check it carefully with LED desktop magnifying Glass , there is no phenomenon of water damage or mold.
Connect the DC power supply to the logic board, measure the power supply voltage of the U1601. The voltage is below 500 and the voltage is abnormal.
Connect the logic board PCB bracket. Use QUICK 861DW hot rework station to remove the U1601.
Test the resistance between A6# of U1601 and ground. the value is normal. Measure the resistance between A2# and ground, the measured value is "OL", A2# and B2# of U1601 are connected to the positive pole of the battery through L1604. So we judge L1604 is the fault part.
Replace the new L1604. Remove the L1604, we can see that one of the pins of L1604 has been oxidized and cannot be tinned. Apply some BGA solder paste to the pads, use heat gun to weld the new L1604. After that, measure the resistance between A2# and ground again, the resisstant value is normal.
Finally, we need to re-solder the chip U1601. Before soldering chip, clean the dirty on the separated U1601. Apply some BGA solder paste to the pads. Place the U1601 to the correct position and solder with heat gun.
Assemble the iPhone. Go to Settings > Sound > Ring. At this time the sound is output normally. The problem of iPhone 6 has no speaker sound have been cleared.
After receiving the iPhone 6, we turned on the power. Then go to Settings - Sounds - Ringtones. Select one from the list. The iPhone 6 has no speaker sound. Everything works fine when you plug in the headphones, which indicates the normal state of the iPhone Audio IC. Therefore, the fault may be related to the speaker and audio power amplifier circuitry.
Repair Process
Disassemble the phone and measure the resistance values of 1# and 2# on the flexible cable connector of the charging port. The normal resistance value indicates a normal speaker buzzer.
Continue to measure the resistance between 1#J1817 and ground, 2# with digital multimeter, the value of current is normal, which indicates the circuit from the charging port connector to the U1601 is also normal.
Take out the logic board and check it carefully with LED desktop magnifying Glass , there is no phenomenon of water damage or mold.
Connect the DC power supply to the logic board, measure the power supply voltage of the U1601. The voltage is below 500 and the voltage is abnormal.
Connect the logic board PCB bracket. Use QUICK 861DW hot rework station to remove the U1601.
Test the resistance between A6# of U1601 and ground. the value is normal. Measure the resistance between A2# and ground, the measured value is "OL", A2# and B2# of U1601 are connected to the positive pole of the battery through L1604. So we judge L1604 is the fault part.
Replace the new L1604. Remove the L1604, we can see that one of the pins of L1604 has been oxidized and cannot be tinned. Apply some BGA solder paste to the pads, use heat gun to weld the new L1604. After that, measure the resistance between A2# and ground again, the resisstant value is normal.
Finally, we need to re-solder the chip U1601. Before soldering chip, clean the dirty on the separated U1601. Apply some BGA solder paste to the pads. Place the U1601 to the correct position and solder with heat gun.
Assemble the iPhone. Go to Settings > Sound > Ring. At this time the sound is output normally. The problem of iPhone 6 has no speaker sound have been cleared.
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