This is the Nokia 1680c and 168c solution for not working ringer or hands free speaker problem, that result to no ringtone or loud speaker sound can be heard on the device.
This solution below shows the connection line paths of the hands free speaker for easy troubleshooting and repair. But to fix a speaker failure, you may first check the speaker using a multimeter to easily confirm if its still working or already damaged. If the speaker is okay, clean the speaker terminal contact pads and locate the components shown on the solution below, then do a check an replacement procedure.
First check the filter coils and the ESD protection diodes on each speaker polarity connections, then replace if found damaged. Trace also each corresponding connection from the speaker terminal pads down to the components where it is being connected.
The circuit used a AUDIO AMPLIFIER chip, to boost the sound loudness. You may also check and replace this said chip, but first check the battery supply voltage of that chip before attempting to replace it.
This solution below shows the connection line paths of the hands free speaker for easy troubleshooting and repair. But to fix a speaker failure, you may first check the speaker using a multimeter to easily confirm if its still working or already damaged. If the speaker is okay, clean the speaker terminal contact pads and locate the components shown on the solution below, then do a check an replacement procedure.
Nokia 1680c and 1681c Speaker Problem Solution
The circuit used a AUDIO AMPLIFIER chip, to boost the sound loudness. You may also check and replace this said chip, but first check the battery supply voltage of that chip before attempting to replace it.
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