跳至主要内容

Fixed: iPhone 6 Won't Turn On


iPhone 6 is directly connected to the DC power supply after short circuit, large current short circuit and iPhone motherboard overheating. We think this is a small problem. When we remove the iPhone, we find that the iPhone charging tube is hot. Remove the shield and apply some rosin. Obviously, the iPhone baseband power supply is damaged. Delete the iPhone baseband power, then connect the iPhone logic to the DC power, the iPhone start, but not display, more clearly check, several pins on the socket are damaged.
 


Remove the socket and clean the pads, re solder the socket. After replacement, iPhone can be turned on normally, but there is no baseband.

Install the new iPhone baseband power supply, but there is no SIM card failure, continue to measure it, and no front and rear cameras. IPhone 6 no front and rear cameras are usually caused by a 2.85 volt power supply. A regulated converter is found directly. Scrape off the glue and weld the jumper. We can check the bitmap in WUXINJI Dongle.

Based the picture, soldering a jumper wire from photosensitive 3V to camera 2.85V, and then test the iPhone camera, the rear camera is normal, but the front camera not. The data measured by Fluke 15B+ Digital Multimeter all is normal. We think the iPhone has been flashed when the camera is damaged. Because there is an ID, so we can't flash the iPhone, and the customer doesn't care this failure, so directly install the iPhone.

After install the iPhone, turn on iPhone, after Apple logo appears 2 seconds, it's automatically turned off. Connect iPhone to the DC power supply, the current jumps from 80 to 160, after a while, it turns 0. According to our experience, we think it's iPhone Nand flash problem.


From the above picture, we can see that this shield cover has been dented by a lot of external damage，it seems the iPhone Nand flash virtual weld. Directly remove the iPhone Nand flash, re-weld it and then install it, but the problem still there.


Now, we need to flash the iPhone, get the ID from customer to flash the iPhone by iTunes. After flashing the iPhone, the problem was solved, it's a system problem.
Learn more cell phone repair tutorials on www.vipfixphone.com

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