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Here's a hints on how to repair or fix Nokia 5800 XpressMusic Digi Mic Knopfler problem issues.
A guide picture below which I included an schematic diagram shows each
every components and line paths for quick test and check up procedures.
Digi Mic Knopfler Pin configuration:
1. L/R - microphone's left and right audio signals groundings
2. CLK - Audio Clock data
3. Data - Digital Microphone data
4. VDD - Power supply voltage
Locate and trace each and every components, line paths and corresponding
connection as shown on a picture. The red highlighted components and
line paths is for the power supply voltage which came from Power
management IC (AVILMAS) Vsim2- approximately 2-3 volts.
Test and check this components and track the supply voltage from C220 to C2170 then through the digi mic knopfler pin 4.
The pink highlighted components and line paths is for Audio Clock data
signal, which is came from the Audio Codec IC (Avilmas) then flow across
R2201 and R2170 (valued 100ohms each) then to the Digi mic knopfler
pin number 2. Check also the C2173 valued 22p Clock filter capacitor
for possible damaged.
I included step by step procedures on the images like as follows:
* Check each components and line paths.
* Replace if found open or shorted
* Jumper the line paths if found open or cut
* Check or replace the digi mic knopfler for a quickest step might as possible.
The microphone's digital data signals has also a line paths connected
to the front side of the Printed circuit board, check and trace also
this line paths which is connected to digi mic knopfler's pin 4