In this article, I will explain how to repair charging error in Samsung J7 Prime / On nxt / On7 Prime due to temperature too high. There are different versions of this model. These are G610F, G610F/DS, G610F/DF, G610M, G610M/DS, G610Y/DS.
How this charging error comes?
If mobile is switched off, you will get an orange colored triangle symbol when charger is connected.
If the mobile phone is on and you connect the charger to the phone, you will get an error message like this,
Let’s repair the Charging error
Generally, temperature too high or low errors come due to the faulty Thermistor. It is a resistor whose resistance strongly depends on the temperature.
The term Thermistor comes from Thermal + Resistor
Thermistors are of two types.
- NTC (Negative Temperature Coefficient type)
- PTC (Positive Temperature Coefficient type)
In NTC type thermistor, if the temperature increases, the resistance of the thermistor decreases.
In PTC type thermistor, if the temperature increases, the resistance of the thermistor increases.
Mostly NTC type thermistors are used as temperature sensor. If your mobile phone is actually too hot due to some problem, the CPU stops the charging as the resistance of the thermistor decreases.
But sometimes, the thermistor is faulty and its internal resistance decreases irrespective of any change in temeperature. And most of time, this type of error comes from a faulty thermistor.
In this case, removing the faulty thermistor can charge the mobile phone well, but it is recommended to replace with a new thermistor. Thermistor is used for the protection of the mobile phone.
First, you need to disassemble the Samsung J7 prime. Take out the main board and check the thermistor.
The thermistor is present near the charging port. See the below picture to find out the thermistor.
How to check the thermistor
First check the resitance of the thermistor (say R1) using a multimeter.
Apply heat on the thermistor by SMD Machine or Hot air blower. Check the resistance (say R2)
If the resistance remains unchanged, i.e. R1=R2, then the thermistor is faulty.
Now, remove the faulty thermistor and replace with a new one. Your mobile will charge well.
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