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
Test and check this components and track the supply voltage from C220 to C2170 then through the digi mic knopfler pin 4.
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.