Here's the Sony Ericsson Spiro w100i,W100a solution for not working earpiece speaker. This repair guide provides some simple step by step procedures on how to fix the earpiece speaker problem.
1. Check the Earpiece Speaker using a multimeter, clean if oxidized or replace if found damaged.
2. Check the Flex ribbon cable wire, replace if damaged.
3. Check or replace the filter coils and capacitors.
