1.remove the battery and connect to PC. connected=battery problem.
2.resolder LCD's pins, then connect to PC. connected=LCD problem
3.replace quartz crystal (24 or 24.576MHz).
4.re-solder the flash memory's pins(48pins IC)
5.if all not working, then u need firmware upgrade.
*make sure remove battery and disconnect PC when doing step 2,3,4.
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