GH688,GA628, Standard Electrical Repairs
4/00021-2/FEA 209 544/1.G 24 (112)
Fig. 4.3
If the fault remains, send the phone to the next level.
4.3 Microphone out of order.
Open the phone and check for liquid damages, especially around X830 (fig. 4.1) and
below J603 (marked area A in fig. 4.2).
Clean the system and microphone connector pads if needed.
Most of the microphone faults are mechanical. Therefore you should start with
replacing the front (with microphone) and elastomer to one you know works and try
again.
If the fault remains, measure the resistances of C850 (>100 kohms), C851 (>1
kohms), R817 (~1 kohms) and R819 (~1kohms, all of class A and in fig. 4.3). Note!
The resistors are mounted at boards from revision R3A and above.
Check the solderings of N800 (fig. 4.3).
Replace C818 and C819 (fig. 4.3).
If the fault still remains, send the phone to the next level.
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