This solution provide and point out which components needs for check up if the speaker has no audio sound output. Just refer to it and locate the highlighted components.
If the speaker is already been confirmed okay, you may then check all of the filter coils in the circuit.
Check or read the battery supply voltage (VBAT) on the 0 ohms resistor and inductor coil, this voltage supplies the IHF amflier IC to work. If the voltage is missing, check or replace the inductor coil and resistor.
If the supply voltage reading is okay, you may then try to rework the IHF amplifier IC, replace if necessary.