2. Speaker problem
3. Mic Problem
4. Camera problem
5. Insert sim
6. Display problem
7. Charging problem
8. Keypad Problem
9. Broken Track's
10.Memory card problem
Solution for all above.
1. Switch the multimeter in 200K mode.
2. Connect the red probe to the grounding.
3. The black probe can be used to check any track for connection.
4. Any track shows some resistance if it dose'nt shows any then the track is open or NC.
For Example : Ringer problem
An ok ringer on board track will show around 8.9kohm and if its shows open then trace the track for thr resistor then coil
and ringer ic.
Same as for the display fault after changing the display still same then check all the tracks of display connector in reverce
bias or compare it with an ok phone.