no ringing or vibration ring of small

Examination and treatment:
(1) ringer and the PCB contact between the well? Treatment Ibid.
(2) whether the ringer is damaged (for Dynamic their normal resistance of about 30Ω) or the existence of the relevant circuit cold solder joint?
(3) The driver transistor burned out?
(4) The sound hole has been plugged?
9, LCD display abnormal
Examination and treatment:
(1) LCD and the PCB contact couplings between the well? Can be cleaned and then try to install.
(2) operating voltage, clock, is it normal? The existence of cold solder joint?
(3) software have any questions? To write a software could give it a try:
(4) Whether the quality of LCD is not so good? If so,replace LCD

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