News

iPhone XR HD motherboard color diagram A   JUAT1_E: Upper antenna switch interface.   No signal after damage, abnormal signal.   J4300: Power button, secondary microphone, flashlight interface socket.   No microphone function, flashlight unusable, electric leakage, etc. after damage.   J4500: Dot matrix projector interface socket.   Face ID function unusable after damage.   U5000: Ear speaker two-in-one driver chip.   No sound from ear speaker, electric leakage, high current after damage.   U1000: CPU application processor A12.   No power on, some functions abnormal, flashing error 4013, 9, 4014 not connecting, etc. after damage.   U5900: Voltage comparator.   External accessory functions abnormal after damage.   U6200: Fast charging chip.   No charging, high current after damage.   J5700: Display socket interface.   No display, abnormal display, black screen, etc. after damage.   U5050, U5660 backlight driver chips.   No backlight, no display, electric leakage, etc. after damage.   U4902: Speaker amplifier chip.   No sound from speaker, electric leakage, high current, etc. after damage.   U5102: Vibration control IC.   Tactile feedback function abnormal, no vibration, electric leakage, high current, etc. after damage.   J3500: Mute volume key wireless charging socket interface.   Mute volume key wireless charging abnormal after damage.   J6400: Tail plug interface socket.   No sound from speaker, no charging, no microphone function, no vibration, etc. after damage.   U_ET2_K: Amplifier power supply tube.   No signal, no network, high current, etc. after damage.   J3200: Battery interface socket.   No power on, no charging, abnormal charging, etc. after damage.   J_SIM: Dual SIM card slot interface.   Cannot read card after damage.   External expansion control chip   RASTIC   SA12   Logic chip.   No power on after damage.   - Logic chip.   Pressure sensor   J3900: Rear iPhone XR HD mainboard color diagram side B FLQFLX_E: Signal diversity device. After damage, no signal, abnormal signal, etc. DSM_LB_E: Low-frequency diversity receiver. After damage, no signal, abnormal signal, etc. U4100: Flash drive 2. After damage, causes camera not to open, flashlight cannot be used normally. U4120: Flash drive 1. After damage, causes camera not to open, flashlight cannot be used normally. U3700: Camera power supply IC. Damage causes camera to not function normally, short circuit, large current, etc. U2700: Main power supply IC. Damage causes failure to power on, short circuit, not connecting, rebooting, freezing, etc. U_BB_K: Baseband CPU. Damage causes no baseband, flashing error 4013, automatic reboot, no signal, not recognizing card, etc. U_XCVR_K: RF IC. Damage causes no service, no network, etc. PA_UHB_K: 2G power amplifier. Damage causes no signal, no network, large current, short circuit, etc. Duplexer DSM_HB_E: Main frequency diversity receiver. After damage, no signal, abnormal signal, etc. U4400: Iris recognition IC. Damage causes facial recognition function to be unusable. -9985 BSBYDES U4700: Large audio. Damage causes no sound, no earpiece, no ringtone, no sound in headphones, etc. U5600: Touch power supply. Damage causes touch to not function normally, etc. U2600: Hard disk. Damage causes failure to power on, white apple, large current, rebooting, flashing error 9, 40, 4014, etc. U_PMIC_K: Baseband power supply. Damage causes flashing error 4013, rebooting after powering on, etc. Y301_K: Baseband clock 38.4MHz EEPROM_K: Baseband chip. Damage causes flashing error -1, no serial number, rebooting after powering on, etc. U3400: Wireless charging IC. Damage causes wireless charging to not function normally, short circuit, large current, etc. U3300: Charging IC. Damage causes failure to charge, cannot take in power, etc.

iPhone XS Max high-definition motherboard color diagram JUAT1: Antenna interface seat. Damage causes no signal, no network, etc. DPLX3U_A: WIFI high-frequency filter. TPLX1_K: GPS antenna switch. LNAGPS_K: GPS noise reducer. DSM44U_K: Power amplifier. DSM_LB_K: Low-frequency diversity receiver. Damage causes no signal, no network, etc. U3400: Wireless charging IC. Damage causes wireless charging to be unusable, leakage, high current, etc. U_BB_K: Baseband CPU. Damage causes no baseband, flashing error 4013, automatic reboot, no signal, no card recognition, etc. U5600: Touch power supply. Damage causes touch to be unusable, etc. U_WLAN_W: WIFI Bluetooth. Damage causes no WIFI, no Bluetooth, boot restart, unable to wake up, etc. U_5G_L_W. DSM44L_K. JLAT_A: Antenna interface. CPL_K. PA_UHB_K: High-frequency power amplifier. Damage causes no signal, no network, high current, leakage, etc. PA_HB_L: High-frequency power amplifier. Damage causes no signal, no network, high current, leakage, etc. J_UAT2: Signal antenna interface. Damage causes no signal, no network, etc. U_5G_U_W: WIFI amplifier. TPLX2U_A: Filter. DSM_HB_K: High-frequency diversity receiver. Damage causes no signal, no network, etc. EEPROM_K: Baseband chip. Damage causes flashing error -1, no serial number, boot restart, etc. U_NFC_S: NFC payment. Damage causes flashing error 56, payment function unusable, etc. Y301_K: Baseband clock 38.4MZH. U_PMIC_K: Baseband power supply. Damage causes flashing error 4013, boot restart, etc. U_QVET_K: Power supply for amplifier. Damage causes no signal, no network, high current, leakage, etc. J_SIM: SIM card seat. U_XCVR_K: RF. Damage causes no service, no network, etc. PA_LB_L: Low-frequency power amplifier. Damage causes no signal, no network, high current, leakage, etc. J5800: Touch seat. Damage causes no touch, etc.

iPhone XS HD Mainboard Color Diagram J3900: Main camera seat (wide-angle lens). Damage causes camera malfunction, etc. J4500: Dot matrix projector seat (Face ID). Damage causes Face ID function to be unusable, etc. J4600: Ambient light sensing distance sensor microphone seat. Damage causes secondary microphone distance sensing to be unusable, etc. J4200: Front camera seat. Damage causes front camera to be unusable, etc. J6400: Connector. Damage causes no charging, no ringtone, no vibration, no voice transmission, no connection, etc. J4530: Infrared lens seat (Face ID). Damage causes Face ID function to be unusable, etc. J3500: Mute volume key seat. Damage causes mute key and volume key to be unusable, etc. J3200: Battery seat. Damage causes device not to power on, not to charge, etc. J5700: Display seat. Damage causes no display, abnormal display, black screen, etc. c20-00997-15: J4300: Power button flash seat. Damage causes no response when powering on, no voice transmission, no flash, etc. J4000: Main camera seat (telephoto lens). Damage causes camera malfunction, etc. U6300: USB control. Damage causes no connection, no charging, white Apple reboot on startup, 250MA startup fault, etc. U6200: Fast charging IC. Damage causes no charging, high current, etc. Y3000: 32.768K. U4700: Large audio. Damage causes no sound, no earpiece, no ringtone, no sound from headphones, etc. U3100: Boost converter. Damage causes device not to power on, leakage, high current, etc. U5900: Comparator. U2600: Hard disk. Damage causes device not to power on, white Apple, high current, reboot, flashing error 9, 40, 4014, etc. -U6150: USB power supply tube. U3620: Barometric pressure sensor. Damage causes barometric pressure sensor function to be unusable, etc. U6020 U3600: Gyroscope gravity sensor. Damage causes issues, etc. U4120: Flash driver 1. Damage causes camera not to open, flashlight unable to be used, etc. U3700: Camera power IC. Damage causes camera to be unusable, leakage, high current, etc. U4400: Rigel Driver power supply. Damage causes facial recognition function to be unusable, etc. U1401: Logic chip. U1000: A12/CPU. Damage causes device not to power on, flashing error 9, 14, 4013, 4014, no connection, etc. U2700: Main power supply. Damage causes device not to power on, leakage, no connection, reboot, freeze, etc. A12 U4100: Flash driver 2. Damage causes camera not to open, flashlight unable to be used, etc. U3900 U5002: Front earpiece speaker. Damage causes earpiece speaker to malfunction, no sound, leakage, high current, etc. U4902: Speaker amplifier. Damage causes no hands-free, no speaker, leakage, high current, etc. Y1000: 24M main clock. Damage causes device not to power on, low current, etc. U5102: Vibration control IC. Damage causes haptic feedback function to be abnormal, no vibration, leakage, high current, etc. U3300: Charging IC. Damage causes charging failure, etc.

For phones that are not seriously soaked in water, what you should do when the phone gets soaked in liquid is not to press any buttons. We are used to the first thing to do after the phone gets soaked in liquid is to press the power button to see if the phone can still be turned on. This practice is wrong and may cause greater failures to the phone. When the phone is in standby mode with a black screen, many circuits are not working, that is, they are not powered. When the power button is pressed to wake up, some circuits of the phone start to work, which may cause the subsequent powered circuits to short-circuit and burn due to water ingress. What we need to do after the phone gets soaked in water is to disassemble the phone. First, we need to cut off the power, that is, cut off the connection between the battery and the motherboard, and then use the dryer to blow dry the water until the water is no longer visible, and then use the hot air to heat the motherboard back and forth evenly (note that the dryer should not be too close to the motherboard to keep more than 5cm), heat for 5 to 10 minutes and cool naturally. After the motherboard cools down, you can try to install the battery to start the machine for testing. Generally, this is the solution for non-serious water ingress. If the phone is severely flooded, you can simply cut off the power and perform the above steps before going to a professional repair shop for testing and treatment. Do not operate blindly to avoid causing more serious problems to the phone.

Nowadays, smartphones are basically held in the hand. Although they are equipped with protective cases, they will inevitably have some bumps and wear. Severe cases will cause slight or even serious deformation. The most reasonable way to deal with this kind of mobile phone is to replace the middle frame. For normal wear and slight deformation of the middle frame, you can try to replace it yourself. Of course, you must have experience in disassembling the phone before you can try it. You can buy the middle frame, auxiliary tools and replacement video reference online. It is not recommended to disassemble and assemble the seriously deformed one yourself, because when the motherboard is deformed and stretched and the screws are removed to restore it, it is very likely that the inner layer of the motherboard will be damaged.

Nowadays, smartphones are basically kept in hand. Although they are equipped with protective cases, they are still inevitably subject to some bumps and wear. In severe cases, they will be slightly deformed or even severely deformed. The most reasonable way to deal with such a phone is to replace the back cover. If the back cover is normally worn, bumped, or slightly deformed, you can try to replace it yourself. Of course, you must have experience in disassembling and assembling the machine before you can try it. It is not recommended to disassemble and assemble the seriously deformed one yourself, because when the motherboard is deformed and stretched to the point where the screws are removed to restore it, it is very likely that the inner layer of the motherboard will break.

Mobile phone cameras are divided into rear cameras (large cameras and front cameras (small cameras). When the screen goes black after turning on the camera or the photos are blurry and cannot be automatically focused, you can solve the problem by replacing the rear camera (if it is caused by a motherboard failure, replacing the rear camera cannot solve the problem).

Mobile phone cameras are divided into rear cameras (large cameras) and front cameras (small cameras). The front camera cannot be replaced alone, it needs to be replaced together with the front camera cable assembly. The functions included in the front camera cable assembly are: front camera, hands-free call (Siri voice), light sensor (automatic brightness adjustment), distance sensor (normal call black screen), if there is a problem with the above functions or the screen is black when switching to the front camera, you can solve it by replacing the front camera (if it is caused by a motherboard failure, replacing the front camera cable assembly cannot solve it).

If the phone cannot adjust the volume, and the volume button and mute function are abnormal, replacing the volume button cable can solve the problem. This description applies to all models of Apple phones after Apple 4S and Apple 5. The iPhone4S volume cable includes: volume +/- function, mute function, headphone jack (headphone sound, transmission, line control), and video MIC (video microphone). These functional abnormalities can be solved by replacing the volume mute cable. The iPhone6 ​​volume mute cable only includes: volume +/- and mute functions. If the volume + or volume - or mute function is abnormal, replace the volume mute cable. The iPhone6Plus volume mute cable only includes: volume +/- and mute functions. If the volume + or volume - or mute function is abnormal, replace the volume mute cable. The iPhone6S Plus volume mute cable only includes: volume +/- and mute functions. If the volume + or volume - or mute function is abnormal, replace the volume mute cable. The faults and solutions mentioned above are only limited to problems with the accessories themselves. If it is caused by a motherboard failure, the motherboard needs to be repaired.

There are two situations for repairing a phone without sound: 1. There is no sound from the receiver. You cannot hear the other party's voice during a normal call. After disassembling the phone, first check whether the contact point between the receiver and the front camera cable is abnormal. If it is normal, replace the receiver. If there is foreign matter oxidation or rust, it needs to be cleaned. If it cannot be cleaned, the damaged accessories need to be replaced. In this case, both need to be replaced. If there is noise in the receiver, you can try to replace the receiver to solve it. 2. There is no sound from the external speaker, that is, there is no sound when playing music, videos and ringtones. You can try to replace the speaker to solve it. Accessory replacement can only solve the fault caused by the accessories themselves.

What should I do if there is no sound from the handset of the mobile phone? There are two situations for repairing the no sound of the mobile phone: 1. There is no sound from the handset. You cannot hear the other party's voice during a normal call. After disassembling the phone, first check whether the contact point between the handset and the front camera cable is abnormal. If it is normal, replace the handset. If there is foreign matter oxidation or rust, it needs to be cleaned. If it cannot be cleaned, the damaged accessories need to be replaced. In this case, both need to be replaced. If there is noise in the handset, you can try to replace the handset to solve it. 2. There is no sound from the external speaker, that is, there is no sound when playing music, videos and ringtones. You can try to replace the speaker to solve it. Accessory replacement can only solve the fault caused by the accessories themselves.

The phone does not charge or connect to the internet, and does not support this accessory. For this type of problem, the only accessory that can be replaced by an individual is the docking station. In addition to the docking station problem, a large part of the problem of not charging and not connecting to the internet is caused by the motherboard problem. If it is caused by the motherboard problem, it needs    to be repaired by a professional maintenance personnel.  

What should I do if the phone cannot be turned on? If the phone does not turn on during normal use, you can first connect the computer to iTunes (please download and install this software if it is not installed on the computer) and click Restore Device or Update Device to perform system recovery or flash. If an error occurs during recovery or the computer is not connected, then there is a problem with the phone hardware. Hardware failure can only be repaired by a professional repairman. For abnormal use that does not turn on, such as a serious fall or a bent and deformed back shell, do not do anything, and directly ask a professional to handle it to avoid secondary damage to the phone.

After using iPhone for a long time, the battery will have problems such as poor battery life, poor battery durability, and battery life of less than 80% as the phone is used. It may also be caused by various other reasons during use, such as abnormal battery failure to charge, low storage power, and automatic shutdown when there is more than 10% of power. In this case, you can replace the battery. Replace the battery of Apple mobile phone. First of all, the battery and motherboard of Apple mobile phone are connected by snaps, no welding is required, and anyone with experience in disassembling and assembling can replace it. As the battery is used for a long time, the battery life will gradually become insufficient. There are also abnormal battery failures caused by other problems, such as abnormal battery failure to charge, low storage power, and automatic shutdown when there is more than 10% of power. These can be solved by replacing the battery. Replacing the battery can only solve problems caused by battery problems. For example, problems caused by leakage of the motherboard require repairing the motherboard to solve them.

The HOME button has only one function of returning. Since the return button is connected to the tail plug cable, problems with the tail plug cable will also cause the return button to fail. If the HOME button does not pop up automatically after pressing it, replacing the return button cable can solve the problem. This description applies to all models of Apple phones after Apple 4S and Apple 5. The HOME button of iPhone4S has only one function of returning. Since the return button is connected to the tail plug cable, problems with the tail plug cable will also cause the return button to fail. Generally, if the button does not pop up automatically after pressing it, replace the return button cable. If it can pop up normally after pressing it, it is mostly a problem with the tail plug. Replace the tail plug. The HOME button of iPhone5 has only one function of returning. Similarly, the return button is connected to the tail plug cable. Problems with the tail plug cable will also cause the return button to fail. Generally, if the button does not pop up automatically after pressing it, replace the return button cable. If it can pop up normally after pressing it, it is mostly a problem with the tail plug. Replace the tail plug. The HOME button of iPhone5C has only one function of return. The return button is also connected to the tail plug cable. If there is a problem with the tail plug cable, the return button will malfunction. Generally, if the button does not pop up automatically after pressing, replace the return button cable. If it pops up normally after pressing and the function is normal, it is mostly a problem with the tail plug. Replace the tail plug. The HOME button of iPhone5S has two functions, one is the return function and the other is the fingerprint recognition function. The return button is also connected to the tail plug cable. If there is a problem with the tail plug cable, it will also cause the return button to malfunction and fingerprint recognition abnormality. We all know that iPhone models starting from 5S have an additional fingerprint unlocking function. The HOME button and motherboard of each mobile phone are matched, that is, one-to-one. If there is a problem with the return button of the mobile phone, it cannot be replaced alone, otherwise the fingerprint function will not be able to be used. Therefore, if there is a problem with the HOME button, it is best to find a repairman to repair it. Of course, if the entire HOME button cable is disconnected, it can only be replaced and the fingerprint function cannot be used after the replacement. The HOME button of iPhone6 ​​also has two functions, one is the return function and the other is the fingerprint recognition function. We all know that iPhone models starting from 5S have a fingerprint unlocking function. The HOME button and motherboard of each phone are matched, that is, one-to-one. If there is a problem with the phone's return button, it cannot be replaced alone, otherwise the fingerprint function will not be able to be used. The difference between iPhone6 and 5S is that the HOME button of iPhone6 ​​is connected to the motherboard through an extension cable, so if the extension cable is broken, it can be replaced without affecting the fingerprint function. Of course, if the HOME button cable is broken, it can only be replaced and the fingerprint function cannot be used after replacement. It is best to find a professional repairman for the HOME button problem. The iPhone6Plus HOME button also has two functions, one is the return function, and the other is the fingerprint recognition function. We all know that iPhone models starting from 5S have a fingerprint unlocking function. The HOME button and motherboard of each phone are matched, that is, one-to-one. If there is a problem with the phone's return button, it cannot be replaced alone, otherwise the fingerprint function will not be able to be used. Similarly, the HOME button of iPhone6Plus is also connected to the motherboard through an extension cable, so if the extension cable is broken, it can be replaced without affecting the fingerprint function. Of course, if the HOME button cable is disconnected, it can only be replaced and the fingerprint function cannot be used after replacement. It is best to find a professional repairman to repair the HOME button problem. The iPhone6S HOME button also has two functions, one is the return function, and the other is the fingerprint recognition function. The difference between the iPhone6S HOME button and the iPhone6 ​​is that the iPhone6S HOME button extension cable is connected to the screen backlight. Even if there is a problem with the extension cable, it cannot be replaced by an individual and requires professional equipment and a professional master to replace it. Of course, if the HOME button cable is disconnected, it can only be replaced and the fingerprint function cannot be used after replacement. It is best to find a professional repairman to repair the HOME button problem. The HOME button cable of iPhone6S Plus is the same as that of iPhone6S. The difference between the HOME button of iPhone6S Plus and iPhone6 ​​is that the HOME button extension cable of iPhone6S Plus is connected to the screen backlight. Even if there is a problem with the extension cable, it cannot be replaced by an individual. It requires professional equipment and a professional technician to replace it. Of course, if the HOME button cable is disconnected, it can only be replaced and the fingerprint function cannot be used after the replacement. It is best to find a professional repairman to repair the HOME button problem. The above-mentioned faults and solutions are limited to the problems of the accessories themselves. If it is caused by a motherboard failure, the motherboard needs to be repaired

The power cable of iPhone4S includes: power on/off function, ambient light sensor (automatic brightness adjustment), distance sensor (black screen when making a call). If these three functions are abnormal, you can replace the power cable to solve the problem. The power cable of iPhone5 includes: power on/off function, volume +/-, mute, video MIC (video microphone), vibrator contact point. If these functions are abnormal, you can replace the power cable to solve it. The power cable of iPhone5C includes: power on/off function, volume +/-, mute, video MIC (video microphone), vibrator contact point, flash. If these functions are abnormal, you can replace the power cable to solve it. If the flash is abnormal, first check whether the rear camera is normal. If the rear camera is abnormal, the flash (flashlight) cannot be turned on. If the flash (flashlight) cannot be turned on when the rear camera is normal, then replace the power cable to solve it. The iPhone5S power cable includes: power on/off function, volume +/-, mute, video MIC (video microphone), vibrator contact point, and flash. When these functions are abnormal, you can replace the power cable to solve the problem. When the flash is abnormal, you should first check whether the rear camera is normal. When the rear camera is abnormal, the flash (flashlight) cannot be turned on. If the rear camera is normal, the flash (flashlight) cannot be turned on, then replace the power cable to solve the problem. The iPhone6 ​​power cable includes: power on/off function, flash function, and video MIC (video microphone). When these functions are abnormal, you can replace the power cable to solve the problem. Similarly, when the flash is abnormal, you should first check whether the rear camera is normal. When the rear camera is abnormal, the flash (flashlight) cannot be turned on. If the rear camera is normal, the flash (flashlight) cannot be turned on, then replace the power cable to solve the problem. The iPhone6Plus power cable includes: power on/off function, flash function, and video MIC (video microphone). When these functions are abnormal, you can solve the problem by replacing the power cable. Similarly, when the flash is abnormal, you should first check whether the rear camera is normal. When the rear camera is abnormal, the flash (flashlight) cannot be turned on. If the flash (flashlight) cannot be turned on when the rear camera is normal, then replace the power cable to solve it. The iPhone6S power cable includes: power on/off function, flash function, video MIC (video microphone), volume +/- and mute function. The volume and power cable of iPhone6S are designed on one cable, so if any function has problems, the entire cable needs to be replaced. Similarly, when the flash is abnormal, you should first check whether the rear camera is normal. When the rear camera is abnormal, the flash (flashlight) cannot be turned on. If the flash (flashlight) cannot be turned on when the rear camera is normal, then replace the power cable to solve it. The iPhone6S Plus power cable includes: power on/off function, flash function, video MIC (video microphone). When these functions are abnormal, you can replace the power cable to solve the problem. Similarly, when the flash is abnormal, you should first check whether the rear camera is normal. When the rear camera is abnormal, the flash (flashlight) cannot be turned on. If the flash (flashlight) cannot be turned on when the rear camera is normal, replace the power cable to solve the problem. The above-mentioned faults and solutions are limited to the problems of the accessories themselves. If it is caused by the motherboard failure, you need to repair the motherboard.

If your budget is not enough, but you want to buy an Apple phone to experience it, buying a second-hand phone is actually a good choice, but the second-hand phone industry is very complicated. How to judge the quality of a phone when choosing? Today, the editor will teach you how to easily distinguish the authenticity of a second-hand phone. Method/Steps Click to set touch ID and password, first check whether there is an ID, and then test the fingerprint! Remember, the fingerprint must be tested before it is considered tested. Then test the WiFi function. After entering the WiFi interface, if the number of WiFis searched is constantly changing, sometimes a lot and sometimes a little, it means that there is a problem with the WiFi function. Finally, enter the ringtone interface, press the volume + and - keys several times, and move the mute key up and down several times. If there is no problem, proceed to the next step. In the SMS interface, against a pure white background, bright spots, gray dots, and even hair and dust can be seen. This is a backlight problem, not a machine quality problem, and will not affect the use of the phone. Still in the SMS interface, after reading the white interface, pull down the status bar at the top and look at the gray interface. You can see abnormal dotted lines in this interface. If you don’t see anything with special colors in this interface, then proceed to the next step. Compass, first check whether the compass rotates normally. If there is no problem, slide left. The white interface can be tested again. This mainly depends on the black interface. The black interface is used to see the crushing. When your mobile phone’s outer screen is broken and you want to replace the outer screen, you will look at the black interface. If there is no other color, then go to the next step. Voice memo, record a voice by yourself, listen to it in the handset mode, remember to put your hand on the front camera to test whether the light sensitivity is normal. The screen is off, which means it is normal, then turn on the speaker mode and listen again. There is no noise in the handset and the speaker, then you can go to the next step. In the main interface, drag an application at will, drag it along the "Z" shape from top to bottom, and then drag it along the edge of the screen. In the middle, if the application does not keep up with the hand movement, focus on testing the lost position and then continue. After the test, if the application icon automatically returns to its original position, it is OK, and go to the next step. This step is mainly to test the sensitivity of the screen touch. Don't drag too fast. Focus on the edge and corner areas. If it is a 6S or higher model, test whether the 3D touch function is OK. Test the camera, front and rear cameras. If the display is normal, it means there is no problem. Test the flash as well. Serial number and serial number (IMEI) Serial number is what everyone likes to ask when buying a phone. These two are equivalent to the ID card of each iPhone. You can check the activation time and warranty time of the iPhone. For out-of-warranty machines, it is not very meaningful. After the machine is received, just check whether the information of the machine in your hand is consistent.  

Q: Why is there no sound when the 4S earphones are plugged in? Is the jack in poor contact or is the jack dirty? A: It is very likely that it is dirty. The cable is not easy to break, but it often breaks due to sweat and water.   Q: It is considered to be splashed with water, not a lot, and the water is all at the tail. If there is no water, what is the problem? A: If the tail is flooded with water, it usually does not affect the display cable on the upper part of the phone. It is very likely that your screen is broken. . . Go to the repair shop and ask him to take a new screen to try   Q: When the phone is turned on, there will be a bad point that lights up, and the position is different every time. Hardware problem A: Hardware problem! Try changing the display screen. If the problem persists, it is usually a problem with the CPU to display J4 cable holder, which is difficult to repair.   Q: If the battery is removed, can the screw with the volume "-" be screwed? I dare not remove it more, at most I can remove the battery. A: Yes, you can see the screws that fix the volume button cable after removing the battery.   Q: I bought a second-hand 4s. In addition to removing the back cover, is there any other way to check whether it is original? A: Whether it is original depends on many details. Other things are not a big problem as long as the motherboard has not been moved.   Q: Sometimes it automatically turns down the volume to the minimum. It has been dropped. Is it a cable problem? A: Automatically adjust the volume. This is a cable problem.

Q: The power button can't bounce up. Do I have to replace it? How much does it cost? A: The black spot on the power button spring sheet has fallen off. Just stick a hard object of similar size on it.   Q: The wifi has turned gray. I have dropped it before. Can it be repaired? A: Replace the WIFI module   Q: Hello, the phone loses 50~100mA when it is turned off. It loses 75% after not playing for a day. Is there something wrong with the power IC? A: If it is a power problem, it usually cannot be turned on. If your phone is flooded, go to the repair shop. It is estimated that the original parts are short-circuited and heated.   Q: Why is the "+" sign tight and the "-" sign loose? If they are loose, they should be loose together! Please answer A: This is normal. The two buttons are originally separate, and the loss of the spring sheet is also different.   Q: The power button collapsed. Within the warranty period, should I replace or repair the phone? A: The machine within the warranty period must be replaced, and the after-sales service can only replace parts such as the camera. I recommend you to change the phone, after all, the warranty is renewed for one year.   Q: Is there a sealant on the wifi module of 4s? A: It is a very thin layer, which can be removed directly with an air gun. Unlike other parts with thick sealant, the sealant of 4S is much more difficult to deal with than that of 4.   Q: Symptoms of iPhone 5 model. The front camera cannot be turned on after the screen is replaced. The new camera cannot be turned on. I heard that there is a problem with the motherboard. No one knows how to fix it? A: Use a multimeter to measure the resistance around the camera to see if there is a short circuit or damage. This is basically the problem.   Q: Why is there no sound when I unplug the earphones? A: Try to unplug the earphones and press the volume button to adjust the volume. Is it displayed as a ringtone or earphones? If it is the earphones, it is usually the audio cable that is broken. If it is a ringtone, it is a problem with the earphone. If it is a problem with the earphone, it is a problem with the power-on cable.   Q: After the old iPhone 4 phone has been put aside for a period of time, the wifi can be turned on, but no network can be found? A: Try to put the phone next to the router and try again. If there is a weak signal, it is the problem of the WIFI antenna cover. It may be that the contact is oxidized and the contact is poor.

Q: How to screw the phone without leaving any marks A: 1. The screwdriver should hold the screw. The key to screwing is to hold it, not to screw it 2. Put a plastic bag on the head of the screwdriver and then screw it. It will leave no marks and it works every time.   Q: The lock screen button was broken before, so I went to repair it and replaced a small thing inside. After that, the lock screen button has never felt as good as before. A: There is a small black gasket on the yellow heat-insulating tape that seals the contact of the power button. It's all because of it. When you repaired it before, the repairman might not have glued it well for you or replaced it with something else. Of course, the feel is not good.   Q: Why is my speaker so quiet? Can you help me analyze it? 4S, it has been dropped and the screen is cracked. A: The speaker sound is quiet. First clean the external speaker, which is the position of the two metal meshes at the bottom of the phone. It is common to be blocked by dust. If the problem persists, try to replace the speaker assembly.   Q: The wifi is poorly soldered. How to solve it without disassembling the phone? A: Of course, the WIFI poorly soldered must be disassembled and repaired, and the tin is re-planted.   Q: After the phone fell, others can't hear me when I make a call, but I can hear others talking. Is the transmitter broken? A: Try using the hands-free. If the other party can hear you talking, then it is a transmitter problem. Replace the tail plug to solve it!   Q: Is the handset broken? The sound is very low and there is noise when making and receiving calls. When I tap the position of the camera on the back with my finger, there is a sound like a loose screw inside. What should I do? It should be out of warranty. How much does it cost to go to Apple customer service for repair? How much does it cost to go to an individual repair shop? A: There is a spring sound when tapping the back. That is the sound of the reed of the rear camera vibrating. The handset has noise and low sound. Try to remove the dust on the handset net first. Many problems are caused by the handset net being too dirty. If it still doesn't work, replace the handset. After-sales will replace the entire power-on cable. Individual repairs only replace the handset.   Q: The 4S mute button is loose, and there is little resistance when dialing down. The volume minus button will shake when touched lightly, but it does not affect normal use. Is the above situation normal? A: The screw is just loose. Just disassemble and unscrew it.