iPhone 3G Battery Cover Assembly, Door Assembly Installation Special Notes:The ribbons of the back cover assembly should be fastened tightly to the ports on the motherboard, but they must be handled gently enough. The buckles of the flex cable ribbons such as the wifi ribbon and the charging port ribbon can be broken easily.
Besides, the two contact blades of the vibrator must also be properly connected to motherboard in order to ensure that it can function normally. There are nearly more than a dozen of small parts included in the 3g battery cover assembly. Try not to lose any of them during disassembling. Each part is necessary for the installation.
Before installation we employ a strict test process including: checking the surfaces of the assembly, especially the back cover and the bezel to spot any scratches or uneven points; testing the function of the charging port assembly composing of the microphone, loudspeaker, charging port and the antenna; testing if the vibrator can run normally and quietly under certain voltage; testing the function of the audio flex cable including the power button, the volume button, and the mute button; testing the earphone jack with the earphone( there must be sounds in dual channels); detecting the recording function with an earphone mic; and finally testing the wifi function.