...Ok, to understood:
-enter in service mode and send to me log file.
-try to set your contrast (if have low level, your color display is blue).
Goto the Contrast Tab in Joker -> Enter service mode ->Light on -> 5007 -> Read -> Adjust contrast -> 5007 Write
- try to change your display (is the same with C60)....
Is possible to have bad contact or missing connection between the phone microcontroller and display connector. Try to rehot the microcontroller BGA (using the hot air generator). Manny times here is the problem (on the Siemens phones - bad connection between the PCB pads and microcontroller).
dagos