Mobile phone repair is a technical task, and sometimes the phone has a clear fault, such as a broken screen. But sometimes the phone looks intact, but it can't be turned on. So how does a mobile phone repair engineer repair a mobile phone that cannot be turned on? This is very curious for many novices. Now let ORIWHIZ briefly describe the process of repairing the phone that cannot be turned on.Clean the phoneThere are many reasons for the malfunction of the mobile phone. First check whether the mobile phone is caused by damp or rain, or the mobile phone has absorbed too much dust, causing the circuit board to malfunction. If these malfunctions occur, very complicated behaviors will often occur. , We have no way to make correct judgments when repairing, so before repairing, we must first clean the mobile phone to confirm that it is not the mobile phone failure caused by these reasons, which can reduce a lot of work. If after cleaning the phone, the phone still has malfunctions, it is necessary to troubleshootCheck the inside of the phoneWe check the mobile phone and ask for investigation from the outside to the inside. To repair a mobile phone, first check whether the menu of the mobile phone has been modified artificially. In many cases, the problem is enlarged through the modification of the menu. If there is no problem with the menu, you need to check whether there are any problems with the battery, the display and the deck. When these are all normal, you need to carefully observe to see if the circuit of the mobile phone is faulty, because the mobile phone’s circuit is not faulty. The circuit is high-density and undertaking, and the inspection process must be very careful.Welding the mobile phoneNowadays, the structure of mobile phones is quite special. Welding is a common problem in mobile phones. Therefore, many mobile phone repairers can repair them only with a hot air gun and a thermostatic soldering iron when repairing a mobile phone. For many mobile phones, it is best to check whether the mobile phone is missing welding before the mobile phone is repaired. If the welding is missing, it needs to be repaired first. It is possible that after the repair welding, the mobile phone will be found to be normal, so it is very important to learn the welding technology for the repair of the mobile phone. Especially the mobile phone that has been dropped may cause many parts in the mobile phone to be unsoldered because of the force of the fall.Line inspection and mobile phone repairFirst, when the phone is not powered on, check whether all parts of the phone are in good contact. If the components are damaged, the components need to be replaced. After that, let the phone power on to see what problems it has when it is working, and be sure not to power on blindly, otherwise the fault may be enlarged.Since the power supply of the mobile phone is the center of the energy supply of the whole mobile phone, there are many cases where the malfunction of the mobile phone is caused by the disconnection of the circuit. In this case, the circuit of the mobile phone must be carefully checked to see if it can supply power normally. If the power can be supplied normally, you need to check other problems of the mobile phone, such as the inability to access the Internet or the inability to recognize the card.The summary is to start with the simplest, make judgments in turn, and eliminate interference. The second is whether the internal structure is damaged or the circuit is faulty. In the end, a cell phone was repaired. Oriwhiz (Shenzhen DongYe Tengfei Electronics Co., Ltd) is a professional iPhone, iPad, iMac, Mac Book, Xiaomi, Huawei, Samsung, Sony, LG, ASUS repair parts and repair tools supplier. Oriwhiz team aims to provide the best quality cellphone replacement parts and repair tools to all customers. We provide comprehensive solutions for cellphone, digital devices, computer repair shops with powerful and handy cellphone repair packages, repair tools, and repair machines. Browse our product category to select an item you like or contact us for wholesale and distribution issues.