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Today the weather is very good, the mood is very happy，iphone 6 plus after turning on, the right display screen  is black while the left normally displays, which is called Yin and Yang screen. When the right screen turns black, it still shows nothing after awakening it，Vipprog can help you with this. The abnormal backlight circuit could cause the Yin and Yang screen. First let’s start from the backlight circuit. After removing the motherboard , we find that the right backlight chip is painted green UV Solder Resist  and soldered a jumper wire. The wire starts from pin A1 U1580 backlight chip to the yellow point near the fingerprint socket J2118, as shown in picture 3-62. Picture 3-62 The I2C bus that left backlight chip  uses and the I2C bus that right backlight chip uses are not the same circuit. The left one is normal while the right one is not, even after the right backlight chip is replaced. Thus, we doubt that there is something wrong with I2C bus of ...

When you IPhone 6 shows nothing after being turned on and the screws  on the motherboard  are gone. what can we do to find a solution here. After teardown this iPhone, we find that someone has twisted off screw BS2503. The real location of screw BS2503 is shown in picture 3-50. Picture 3-50 Observing under a microscope , the screw is shown in picture3-51. Picture 3-51 Getting a useless motherboard, scrape the PCB under the screw off slowly under a microscope. We can see there is a line under it, as shown in picture 3-52. Picture 3-52 Comparing it to a brand new motherboard and checking the bitmap schematic diagram , we know this line is the power supply circuit used between main power chip  and PP1V8_LCM_CONN of LCD socket, as shown in picture 3-53. Picture 3-53 Solder the broken circuit with a copper wire and connect display screen (VC484) to test. Now iPhone can display normally. Paint some UV Solder Resist to make it insulated and use a UV gl...

Trouble Phenomenon The customer said that his iPad 4 lost touch response in particular area of screen and could not be used normally. He has replaced two brand new touch screen  to test, but the problems are still the same. Therefore, we can be sure that the problems happen in motherboard . Repair Process Turn on iPad and install the ketchpad software to test. We find that a part of vertical screen touch is unresponsive to touch. First teardown the iPad, measure the diode data of touch screen interface. One of the data cables’ diode data is infinite, as shown in picture 3-39. Picture 3-39 Opening the bitmap software , we can see that the data cable is connected with the touch screen chip and testing point TP169 at the back, as shown in picture 3-40 and 3-41. Picture 3-40 Picture 3-41 The measured diode data of test point TP160 is more than 600, as shown in picture 3-42. The data is the same as that of other cables’. Thus we conclude that there is line barrier...

When A dropped iPhone 6 Plus touch screen  does not respond like it should be sometimes.  The white stripes appear when touch screen is not working.What should we do?vipprog can help you. IPhone 6 Plus touch screen sometimes responds while sometimes not. And the white stripes appear on screen. This kind of problem is common in iPhone 6 Plus. The dropped iPhone 6 Plus is very likely to have such problems, as shown in picture 3-31. Picture 3-31 The reason is that the pin M1 of touch process chip U2402 almost disconnects. The pin M1 is used by synchronizing signal to communicate between LCD and touch screen control chip . If the synchronizing signal does not synchronize normally, the touch screen will not respond. Remove the touch process chip directly, finding pin M1 has been taken down along with the touch process chip, as shown in picture 3-32. Picture 3-32 After knowing the problem, it is much easy to repair. Solder a Jumper wire  at the original join...

Trouble Phenomenon American customer’s iPhone 6 has been dropped and the front cover glass has broken. The touch function is lost even after replacing a fine LCD screen . Repair Process First replace the old screen with a fine LCD screen and test. The touch function cannot be used, which suggests the problem existing on motherboard . Take out motherboard and check, as shown in picture 3-21. Picture 3-21 As the touch function is lost, we check the touch circuit directly. First measure the diode data of communication coupled capacitor between touch process chip and touch control chip , finding no problem. The coupled capacitor’s location is shown in picture 3-22. Picture 3-22 When measuring I2C chip bus, find the diode data of TOUCH_I2C_SCL is several tens. The normal one should be over 300 and the clock should be the same as data. Generally, the low diode data is caused by short circuit. The main chip of this signal is only the touch chip. The circuit diagram  of...

Trouble Phenomenon IPhone 6 touch function is completely lost. Repair Process Enter system to test, finding the touch function is completely lost. After replacing a display screen , the result is the same. Remove the motherboard and observe, finding little soldering paste around touch process chip, which suggests touch control chip  and touch process chip have been welded, as shown in picture 3-13. Picture 3-13 First measure the diode data of two ends of coupling capacitor (picture 3-14) that is used to communicate between touch control chip and touch process chip. The data is normal. One end of coupling capacitor near touch control chip is connected to touch control chip, while the other end of coupling capacitor near touch process chip is connected to touch process chip. Picture 3-14 Next, measure the power supply voltage of PN5V7_SAGE_AVDDH, PP5V7_SAGE_AVDDH, PP5V1_GRAPE_VDDH and PP1V8_GRAPE. The relevant circuit diagram  is shown in picture 3-15 and 3-16....

vipprogrammer is Professional iPhone mobile phone repair tools online shopping mall,we supply iPhone mobile phone all repair parts  with for your repair business. So, vipprogrammer will still keep on working, when you are hanging out at weekend. vipprogrammer aims at providing you faster shipping, higher quality, better price, quick respond and best service. All kinds of iphone repair tool can be found in vipprogrammer. we provide high quality and competitive price with fast shipping. when your iPhone 6 touch screen uncontrollable opens APP automatically, vipprogrammer can help you. Trouble Phenomenon Customer says that other maintenance staff has fixed his iPhone before. The touch screen  becomes uncontrollable and it opens APP automatically. The screen assembly, iphone touch control chip  and touch process chip have been replaced. Repair Process Power on and enter system to test, finding the trouble is the same as the customer’s description. In general,...