The company should produce more phone for the unexpected needs

The company should produce more phone for the unexpected needs.
100MA around the power supply has reached a phone boot current, this time, if not boot, the logic circuit logic circuit part of the function failed self-test pass or failure, a focus on examination of the following: 100MA to 150MA current and hold, this failure is mostly associated with the power IC and software related maintenance that can be targeted to check. High current, press the power button, but soon fell off, this situation is generally caused by CPU or power of the logic circuit IC leakage. The high current Press the power button or even a short circuit, this failure generally have the following: boot failure reasons and repair instances. The boot line is not normal due to not boot. The company held a meeting to discuss the development direction of phone .
Under normal circumstances, when you press the power button, power key to trigger the terminal voltage should be significant changes in the absence of change, usually the boot keys is bad or is the boot line disconnected components Weld damage. Maintenance, changes in external power supply, observe the ammeter ammeter no reaction in general is bad boot line or power button. Battery and the part of the power supply circuit is not caused by bad boot. For most cell phones, cell phones with batteries or external power supply voltage directly added to the power IC, if the supply voltage is not added to the power supply conversion through the electronic switch coupled to the power IC. In other words, mobile phone power supply there are two paths: the battery all the way, another way is the external interface of the power supply (with machine when the cradle power supply). The customer visited the workshop of manufacturing phone .
When two-way power supply, external interface power supply priority, the two-way power switch is controlled by an electronic switch to mainly to play a protective role for the whole current to prevent internal short circuit or leakage on the phone. IC damage However, if the damage to the electronic switch, power supply module is possible without access to the battery supply voltage caused by cell phone does not boot, this electronic switch powered mobile phone, either with an external power supply interface for power can also be triggered by a battery-chip, to be powered with external power supply. Maintenance through different power supply power supply, in order to distinguish between fault coverage and to determine the electronic switch is normal. The cooling system with 1 fan is included for the antenna of phone .