Repair_Nokia_105_Plus_&_TA_1447_Battery_Lower_Temperature,_Remove_The_Charger!_Ways
The "Battery Lower Temperature, Remove The Charger!" error message on devices such as the Nokia 105 Plus & TA-1447 is a common issue that users may encounter. This problem typically indicates that the phone's battery temperature sensor is detecting an abnormally low temperature, which can prompt the device to stop charging as a protective measure. This issue can arise due to various factors, including hardware faults, software bugs, or environmental conditions. Here, we will explore two potential solutions to this problem: connecting a 10 Ohm resistor from the Battery Size Indicator (BSI) point to the ground (GND) and connecting a 3.7 Volt Zener diode from the BSI point to GND.
Understanding the Problem:
Modern mobile phones, including the Nokia 105 Plus & TA-1447, incorporate a Battery Management System (BMS) that monitors and manages the battery's health, charging, and discharging processes. The BMS includes temperature sensors that ensure the battery operates within safe temperature ranges. When the temperature falls below a predefined threshold, the system may halt charging to prevent potential damage to the battery and ensure user safety. However, false readings from the temperature sensor can trigger erroneous alerts and disrupt the charging process.
Solution 1: Connecting a 10K Ohm Resistor from BSI to GND
How It Works:
The BSI pin is crucial for communicating the battery's status to the phone's BMS. Connecting a 10-ohm resistor from the BSI point to the GND allows you to create a small current path that helps stabilize the voltage at the BSI pin, potentially rectifying false low-temperature readings.
Implementation:
Identify the BSI Point:
Locate the BSI point on the battery connector or the phone's motherboard. This is typically labelled and can be found in the device's service manual.
Prepare the Resistor:
Obtain a 10-ohm resistor. Ensure it is of appropriate power rating to handle any minor currents without overheating.
Soldering: Carefully solder one end of the resistor to the BSI point and the other end to a GND point. Ensure secure and precise connections to avoid short circuits.
Testing:
Reassemble the device, insert the battery, and attempt to charge the phone. Monitor the device to see if the "Battery Lower Temperature" error is resolved.
Pros and Cons
Pros:
Simple and cost-effective.
Easy to implement with basic soldering skills.
Cons:
May not work for all cases, depending on the underlying cause of the error.
Permanent modification may void the warranty.
Solution 2:
Connecting a 3.7 Volt Zener Diode from BSI to GND
How It Works:
A Zener diode allows current to flow in the reverse direction when a specific reverse voltage (Zener) is reached. Connecting a 3.7 Volt Zener diode from the BSI point to the GND can help regulate the voltage at the BSI pin, preventing erroneous readings that trigger the low-temperature alert.
Implementation:
Identify the BSI Point:
Locate the BSI point as described in the first solution.
Prepare the Zener Diode: Obtain a 3.7 Volt Zener diode.
Soldering:
Solder the cathode (marked end) of the Zener diode to the BSI point and the anode to the GND point. Ensure precise connections to avoid damage.
Testing:
Reassemble the device and test the charging process. Monitor to see if the error is resolved.
Pros and Cons
Pros:
More robust solution for voltage regulation.
Can effectively prevent false low-temperature readings.
Cons:
Slightly more complex than using a resistor.
Requires careful handling and precise soldering skills.
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