"Why Does my iphone SE can't make outing calls " a customer saied. iPhone SE can't make calls after battery leaks 50mA current. When you come across this situation. You can reset, restart and so on. But if it don't recovery you must try fix the hardware. But don't lose heart, vipprogrammer will help you to learn a short guide of iphone SE.
Trouble Phenomenon: Customer said his iPhone SE was water damaged and the backlightwas fixed. All the functions were normal, but it leaked 50mA current and cannot call out sometimes. The RF chip and 2G power amplifier chip were fixed before. Repair Process: 1. Teat this iPhone and all the functions are normal. There is signal when plug SIM card and it is normal to make calls. Tear down it and motherboard leaks 50mA. Based on the description of customer, the problems happen on the signal part. The leakage is caused by components electricity leakage on main power supply PP_VCC_MAIN circuits. And PP_VCC_MAIN supply power to all the signal power amplifiers and baseband power, power amplifier powersupply chips. Thus the damage of any of them could cause electricity leakage and faulty signal.
2. As the motherboard has been cleaned, we cannot identify the exact watered places. Thus we use SIM cards from the three operators to test the 2G, 3G and 4G function. They all have signals. Based on the experience of 5S, call failure is often caused by the damaged power amplifier power supply chip. First remove the power amplifier power supply chip U_QPOET_RF. The location of power amplifier power supply chip is shown in picture.
3. Then we offer power to motherboard and the ammeter shows no electricity leakage. Tear a U_QPOET_RF from iPhone 6 accessories board and assemble it on the SE motherboard. Turn iPhone on and test. Calls and other functions are normal.