Low sound and distorted sound normally occurs when there is dust on buzzer mesh or when the buzzer is faulty.
Coils might be faulty.
No continuity between buzzer contacts and coils.
Problem with the on-board connector of buzzer, however, this happens in a very rare case, and there is a thousand in one chance that buzzer problem was due to a problem with on-board connector.
Restart your Oppo F1s phone and check.
Check volume settings of your phone along with your currently active profile.
If you are facing the issue of low or distorted sound, then just take a small pin and clear the holes of buzzer mesh, as most of the time low or distorted sound problem arises due to the dust that is stuck in buzzer mesh.
Plastic separation tool.
A very small sized pin to clear the holes of buzzer mesh.
Oppo F1s Speaker Ways:
Check the buzzer using a multimeter. Replace if already damaged. a distorted audio sounds is cause by a weak buzzer. or it is already burned out. (internal coil is damaged).
If the speaker is good and seems no problem, ensure that the terminal were not misaligned. Then clean the buzzer terminal contact pads for possible oxidation build ups (this might weaken the connection).
Check each of buzzer+ and buzzer- corresponding connection line paths accross to each components where it is being connected.
If any of the buzzer + or – track missing then make a jumper.
If you have further Questions please leave a comment. Note: Please note that even though every solution posted on our website is tested by one or more members of our team before posting, but still we do not take any responsibility for any damage it may cause to your cell phones. Use these repairing solutions at your own risk. Thank You.