Several common mobile phone repair methods

Today's mobile phone is no longer a simple communication tool. Has played an inseparable role in our lives, but we will be at a loss if there is a problem with the mobile phone. ORIWHIZ summarized some mobile phone repair tips for everyone so that you can try to repair your mobile phone at home.

Temperature method

The temperature method can be used in the maintenance of the power supply part of the mobile phone, PA, electronic switches, and some temperature-related faults because when these parts have problems, their surface temperature rise must be abnormal. The following methods can be used for specific operations: ①touch feeling; ②alcohol cotton ball; ③blowing hot air or natural wind; ④spraying special refrigerant. The abnormal temperature rise on the surface of the device helps to judge the fault.

Cleaning method

Since the structure of the mobile phone cannot be fully airtight, and it is a product used outdoors, the internal circuit board is susceptible to the adverse effects of external water vapor, acid gas, and dust, and the contact area inside the mobile phone is generally very small, So the phenomenon of poor contact due to oxidation of the contacts is common. According to the location of the fault phenomenon, the cleaning can be carried out in the corresponding parts, such as SIM card holder, battery reed, ringing reed, microphone reed, receiver reed, vibration motor reed. For old models of mobile phones, focus on cleaning the connector reeds between RF and BB, and the conductive rubber on the button board. Cleaning can be done with anhydrous alcohol or an ultrasonic cleaning machine

Repair welding method

Since the current mobile phone circuits, all use ultra-small SMD, compared with other Google mobile phones, the solder joint area of ​​the mobile phone circuit is much smaller, so the mechanical stress that can withstand (such as the stress when pressing the button) is very small, and it is very easy to appear. The fault of the false welding, and often the false welding spot is difficult to be found with the naked eye. The method is to determine which unit the fault may be in based on the phenomenon of the fault and analyze the working principle, and then use "large area" repair welding and cleaning in the unit. That is, all relevant and suspicious welding points are repaired again. Repair welding tools can use a pointed anti-static soldering iron or hot air gun

Short circuit

When there is a failure that cannot be turned on or is protected when turned on, one of the reasons may be a problem with the power management IC block, or a short-circuit or leakage fault related to the load. At this time, the method can be used to troubleshoot, that is, to short-circuit loads of the power IC one by one, and use the power on/off signal of the manual control IC to find the fault point.

Dummy Load Method

Since the quality of mobile phone batteries on the market nowadays is very different, when the fault phenomenon is related to the battery (such as working time or standby time is significantly shorter), this method can be used to determine whether the fault is in the battery or in the circuit part. The specific method is: first fully charge the battery, and then use the battery to supply power to a dummy load. The power supply current is controlled at about 300mA and the time is about 5 minutes. If the battery is basically normal, its terminal voltage should not drop. The more rigorous method can measure the capacity of the battery, but it is more time-consuming. (Note: According to the nominal voltage of the battery, the dummy load can use 3V, 4.5V, 6V bulbs, or an external power resistor in series. The measuring line connected to the battery reed can only be mechanically crimped and not welded to avoid damage to the battery or an accident

Self-test

Most GSM mobile phones have a certain degree of self-checking and self-diagnosing functions, which is very helpful for quickly locating faults to a certain unit. When using this method, the mobile phone is required to be able to turn on normally, and the repairer must also know how to enter the diagnostic mode. The latter requires the repairer to have the detailed repair information of the relevant mobile phone on hand.

Oriwhiz (Shenzhen DongYe Tengfei Electronics Co., Ltd) is a professional iPhone, Mac Book, iPad, iMac, 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.