I have marked samsung n900 Mic Ways and Jumper points in this diagram but before you make these jumpers make sure that a faulty microphone is not causing this problem. Test it with an electronics meter or simply replace it with a new one.
Rehot Or Replace U704
If Still Not Working Try His Mic Working Voltage Jumper
See The Image Below:
Note: Please note that even though every solution posted on out website is tested by one or more members of our team before posting, but still we do not take any responsibility for any damage it may cause to your cell phones. Use these repairing solutions at your own risk. Thank You 🙂