Here's a solution for nokia N78 ringer and hands free speaker not working or no sounds can be heard on it. This solution shows the left and right speaker circuit components connections.
Nokia N78 Ringer and Hands Free speaker No audio sounds solution
There is an audio amplifier IC that drives and boosts the audio signals before it goes trough to the left and right speakers. The audio data signal is filtered by filter coils and an input capacitors.
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