The below solution picture shows the line paths and layout of components for the Earpiece Speaker.You may trace all of those corresponding components if having trouble with the earpiece or Earpiece Audio sound problem. The positive and negative audio signal which flow across into four coils, a chip resistor 4.6 ohms and an EMI filter chip before it being feeds to the Speaker terminal pads and so on to the speaker.
Nokia 1800 and Nokia 1616 Earpiece Speaker components layout and line paths
The two remaining components are chip resistors, this resistors are fusible resistors with has a zero ohms value. Both positive and negative Audio signals also flow into the two filter coils and the emi filter chip then feeds trough to the speaker.
Nokia 1800 and Nokia 1616 Loud Speaker ( Ringer/Buzzer) line paths and components layout
All those components are very easy to check and you may find a replacement on it if found busted or damaged. If all of its corresponding components were already replace and making sure that all of it working perfectly okay but the problem still exists and no audio sound can be heard over the speaker, we may now consider that the problem lies on the line paths between the main IC or the IC itself is being damaged. connections.
Nokia 1800 and Nokia 1616 Earpiece and Ringer IC component solder ball bumps connection
Just be careful and have a good heat temperature and air flow control using you reworking station in handling the main IC module.