iPhone 7 voice speaker don't work. Help please! - GSM-Forum

esko1 · 03-23-2017, 16:04

Hi. I got today iPhone 7 with broken lcd and none working voice speaker. Customer said that this happened after a drop. I have changed flex cable and speaker but didn't helped. It has to be something on logic board. Even in stereo mode speaker is not working.

iPhone 7 schematic is very complicated. It has one audio codec, and two amplifiers for each speaker. All caps, resistors and coils looks good. Do anyone know what IC is M2800? What is its function? And what the **** is Top Speaker Compass Coil? Where is it. In U3301 amplifier IC?

Any idea what could be a problem? I'm thinking on changing u3301 IC

beingsachinalam · 03-31-2017, 04:53

Is your iphone is in warrenty now?

tuanraja · 03-31-2017, 10:47

make sure to tested all element logicboard like smd,ic that related on your logicboard problem , look good element like smd , ic etc not mean not short , u must test with multitester and i will recommended using power supply for that

mikessa · 04-12-2017, 22:19

Need to check if phone detects ear speakers conected. When you press volume button what infoarmation appears? Volume ou ear phones? Maybe a short on ear phones conector or dock connector. Remove the dock connector to make the test again.

tonyjohn72 · 05-21-2017, 14:13

Contact Apple Support. They are the best person to help you in this.

vinse · 05-21-2017, 19:46

Quote:

Originally Posted by esko1

Hi. I got today iPhone 7 with broken lcd and none working voice speaker. Customer said that this happened after a drop. I have changed flex cable and speaker but didn't helped. It has to be something on logic board. Even in stereo mode speaker is not working.

iPhone 7 schematic is very complicated. It has one audio codec, and two amplifiers for each speaker. All caps, resistors and coils looks good. Do anyone know what IC is M2800? What is its function? And what the **** is Top Speaker Compass Coil? Where is it. In U3301 amplifier IC?

Any idea what could be a problem? I'm thinking on changing u3301 IC

M2800 looks like a bunch of coil used for several circuit in the board
inductance for backlight are theire too

pion · 05-22-2017, 09:10

Change screen then give it to apple.

gurbuz · 07-26-2017, 17:50

I have same problem...... Please help me

03-23-2017, 16:04	#1 (permalink)
esko1 Insane Poster Join Date: Oct 2005 Posts: 64 Member: 193584 Status: Offline Thanks Meter: 8	iPhone 7 voice speaker don't work. Help please! Hi. I got today iPhone 7 with broken lcd and none working voice speaker. Customer said that this happened after a drop. I have changed flex cable and speaker but didn't helped. It has to be something on logic board. Even in stereo mode speaker is not working. iPhone 7 schematic is very complicated. It has one audio codec, and two amplifiers for each speaker. All caps, resistors and coils looks good. Do anyone know what IC is M2800? What is its function? And what the **** is Top Speaker Compass Coil? Where is it. In U3301 amplifier IC? Any idea what could be a problem? I'm thinking on changing u3301 IC

03-31-2017, 04:53	#2 (permalink)
beingsachinalam Junior Member Join Date: Mar 2017 Location: Mumbai Posts: 11 Member: 2699307 Status: Offline Thanks Meter: 3	Is your iphone is in warrenty now?

03-31-2017, 10:47	#3 (permalink)
tuanraja Junior Member Join Date: Mar 2017 Posts: 14 Member: 2693480 Status: Offline Thanks Meter: 0	make sure to tested all element logicboard like smd,ic that related on your logicboard problem , look good element like smd , ic etc not mean not short , u must test with multitester and i will recommended using power supply for that

04-12-2017, 22:19	#4 (permalink)
mikessa Junior Member Join Date: Feb 2010 Posts: 26 Member: 1225078 Status: Offline Thanks Meter: 10	Need to check if phone detects ear speakers conected. When you press volume button what infoarmation appears? Volume ou ear phones? Maybe a short on ear phones conector or dock connector. Remove the dock connector to make the test again.

05-21-2017, 14:13	#5 (permalink)
tonyjohn72 Junior Member Join Date: May 2017 Posts: 9 Member: 2719293 Status: Offline Thanks Meter: 2	Contact Apple Support. They are the best person to help you in this.

05-22-2017, 09:10	#7 (permalink)
pion Insane Poster Join Date: Feb 2005 Posts: 92 Member: 120173 Status: Offline Thanks Meter: 11	Change screen then give it to apple.

07-26-2017, 17:50	#8 (permalink)
gurbuz Freak Poster Join Date: Oct 2007 Location: france Posts: 232 Member: 606801 Status: Offline Thanks Meter: 8	I have same problem...... Please help me