跳至主要内容

iPhone 7 Plus Won't Turn On After Water Damage

Water damage is unavoidable for most of cell phone owners, sometimes even if you are really careful, but the accident often happens, maybe you drop your cell phone into toilet, tank, cup, etc. It's very possible to happen like that. However, how to do if your iPhone 7 Plus drop into water and it's unable to turn on? In this article, you will get answer:

Disassemble the iPhone to check circuit board; there are no obvious traces of water. And then remove all sockets, no traces of corrosion were found on the socket and the socket interface.

Connect the iPhone 7P circuit board to DC power supply, supply power to it, it shows large current and won't boot.

Check the iPhone 7P circuit board and observe under the 7-45X Trinocular Stereo Microscope, we found that both the capacitor and the main supply capacitor on the bottom of the iPhone motherboard to backlight are corroded. According to our experience, for iPhone 7 or iPhone 7 Plus, we can first check the first row of capacitors on this circuit line, because we've repaired the several won't boot iPhone because of the large current caused by the capacitance.

Use PPD 861D Plus hot air rework station to remove C3530, the main power supply not short circuit now, and when we supply power to it, the iPhone can be turned on normally. However, there is no display after iPhone touch screen installation. After check it, we found that D3701 and D3702 have been corroded and blackened, directly replace it.

Re-install the iPhone and test it again, after insert the SIM card, the iPhone is always in the search signal, dialing *#06#, the IMEI can display normally, so we can eliminate the baseband problem.
Tear down iPhone again to check, we found a chip next to the amplifier was missing. After check iPhone schematic diagram on WUXINJI Dongle, it is FL7001_RF. Directly weld a jump wire on it, and then install iPhone to test, now the signal is normal.


More detailed cell phone repair tutorials, please read on our website: www.vipfixphone.com

标签：

评论

发表评论

此博客中的热门博文

iPhone 6 Display Failure after Replacing LCD

The iPhone 6 display is black after replacing LCD. After checking, the diode data of display socket is normal and all power supply for iPhone display IC  output is normal. Testing by  DC power supply , we find the iPhone current is abnormal. When press the iPhone power button, the boot current is obviously large. The current reached 100mA when press the power button. After remove the display tube, the current still the same, which means there is a short circuit. Measure the voltage output of each circuit of power supply with Fluke 15B+ Digital Multimeter , then surprised to find that there are really short circuit places. LD010 is short circuit; we suspect that the filter capacitance on the circuit has been penetrated. After remove the iPhone power control IC , we found it is ground short circuit. Open the WUXINJI Dongle  to check the iPhone schematic circuit, we found that this circuit is the display card image transmission MIPI data bus power supply. CPU brea...
发表评论
阅读全文

Iphone 6S Enters DFU Mode Cannot Start Fault Repair

The customer said that he did not know what the reason was. The mobile phone has been restarted indefinitely and can enter the DFU mode. However, when the flashing machine fails to enter the recovery mode from the DFU mode, and then the mobile phone is connected to the computer for 5-10 minutes, it automatically enters the recovery mode. After we received the 6S that could not be started, we disassembled the power with iphone engraving tool and turned on the power to 100mA. First of all, check if you can connect and read the DFU mode after connecting to the computer. Wireless DFU can not exit, we can only brush the machine to view the error. Refresh Aisi and iTunes respectively. If you stuck on the progress bar for a long time, it is very likely that the error is -1. If the progress bar does not enter, you can roughly determine the probability of a CPU failure. Now we need to see if there is a problem with the hard drive. First, use DC power supply for iphone repair, the hard disk o...
发表评论
阅读全文

Tutorial: iPhone 6S Plus Backlight Repair

Since the size of iPhone6s plus screen display  is large, it's necessary to use two sets of background lights to supply power, one is provided by U4020, the other is provided by U4050. 2  sets of circuit 1) PP_LCM_BL_ANODE,     PP_LCM_CAT1, PP_LCM_BL_CAT2 2) PP_LCM_BL34_ANODE,  PP_LCM_BL_CAT3, PP_LCM_BL_CAT4 For PP_LCM_BL_ANODE and PP_LCM_BL34_ANODE, if one of the circuit has no voltage value, it will cause the iPhone 6s Plus screen to be half bright and half dark. For PP_LCM_CAT1, PP_LCM_BL_CAT2, PP_LCM_BL_CAT3 and PP_LCM_BL_CAT4, if one of  these four circuits gets abnormal signal, it will cause the 1/4 screen to be dark. Solution: Use jumper wire  to short connect PP_LCM_CAT1 and PP_LCM_BL_CAT2 or you can also connect PP_LCM_CAT3 and PP_LCM_BL_CAT4. The control signals of these two sets of backlights, one group of inductors FL4211 FL4212 FL4213 are sent to the display interface. The other group is sent to the display interface...
1 条评论
阅读全文