The Samsung EP-TA50IXE charger, featuring the internal board model SB0412_12501E1, is a reliable, efficient device that uses advanced circuit components like a thermistor, bridge rectifier, switching IC, MOSFET, and voltage controller to produce a stable 5V output. When the charger malfunctions, a systematic repair approach can help in diagnosing and fixing common issues effectively. Here’s a step-by-step guide on repairing this charger, covering ten common problems. Learn how to fix your Samsung original charger with our comprehensive guide. Get your charger working again and keep your devices charged effortlessly.
How to Repair the Samsung Original Charger (Model: EP-TA50IXE)
1. No Power Output
Diagnosis: If the charger isn’t providing any output voltage, start by checking the main AC input. The thermistor (DSC 20D5) is the first component in line and could be damaged.
Solution:
Inspect the thermistor with a multimeter; it should show a resistance that decreases as it warms up. If it remains open or shows no continuity, replace it.
Check the fuse on the AC input line and replace it if blown.
Examine the bridge rectifier diodes (labelled R52). A failed diode would prevent the AC from converting to DC. Replace any faulty diode with the correct rating.
2. Inconsistent Voltage Output
Diagnosis: An unstable output may be due to issues in the smoothing capacitor section, which affects the DC stability after rectification.
Solution:
Check capacitors 1, 2, and 3 (400V, 12µF and 15µF) using a capacitance meter. If any capacitors have degraded, replace them.
Examine for bulging or leakage, as these are signs of failure.
Ensure that the capacitor on the feedback side (Capacitor 4) is intact, as it helps stabilize the output voltage.
3. Overheating Issue
Diagnosis: Overheating may occur due to the switching MOSFET (CS3N90) malfunctioning or the thermistor failing to limit inrush current.
Solution:
Test the MOSFET for shorts by checking its resistance. If it’s conducting continuously or has a very low resistance, replace the MOSFET.
Ensure that the thermistor (DSC 20D5) is functional, as a damaged thermistor can no longer limit inrush current, leading to excessive heat buildup.
4. High-Frequency Noise or Buzzing Sound
Diagnosis: A buzzing noise typically indicates an issue with the switching IC (360H1M) or the transformer’s regulation.
Solution:
Inspect the switching IC for signs of failure, such as burned pins or damaged circuits.
Replace the 360H1M IC if it is faulty, as it is critical in controlling the MOSFET for efficient switching.
Check for loose or damaged transformer windings, which can sometimes cause buzzing.
5. No Output Voltage or Low Voltage Output
Diagnosis: This could be due to a failure in the voltage controller IC (34330C) or issues with the feedback loop.
Solution:
Test the voltage controller IC by measuring its input and output voltages. Replace the 34330C IC if the output is inconsistent or low.
Verify that the feedback loop components, including Capacitor 4 (50V, 10µF), are in good condition. A failed capacitor here can disrupt the feedback, causing output instability.
6. Charger Shuts Off When Load Is Connected
Diagnosis: If the charger turns off when a device is connected, it could be due to overload protection being triggered.
Solution:
Inspect the load-handling components, especially the switching IC and MOSFET, as these control the current to the load.
Check Capacitor 5 (15V, 10µF) in the output section; if it fails, the voltage may fluctuate under load, causing a shutdown.
Replace any faulty components and ensure that the load protection circuit is operational.
7. Fuse Blowing Repeatedly
Diagnosis: This may happen due to a short circuit in the rectifier section or a malfunctioning MOSFET.
Solution:
Inspect the bridge rectifier diodes for shorts; replace any that have failed.
Test the MOSFET (CS3N90) for short circuits using a multimeter; if it’s damaged, replace it.
Make sure that no capacitors are shorted, as this can also lead to fuse blowing.
8. Charger Not Detecting Devices
Diagnosis: If the charger isn’t recognizing devices, there might be an issue with the output voltage regulation or with Capacitor 5 in the 5V output section.
Solution:
Test the output voltage. If it’s lower than 5V, check the voltage controller IC (34330C) and replace it if needed.
Inspect Capacitor 5 (15V, 10µF) to ensure it’s filtering the output properly. Replace it if there are signs of degradation.
9. LED Indicator Malfunction (if present)
Diagnosis: The LED indicator, if present, might malfunction due to issues with the feedback or output regulation components.
Solution:
Check if the LED is receiving the correct voltage. Test for continuity in the circuit leading to the LED.
Replace the LED if it’s faulty. Additionally, ensure the feedback capacitor (Capacitor 4) is in good condition, as it stabilizes the circuit.
10. Voltage Drop Under Load
Diagnosis: If the output voltage drops significantly when a device is connected, it could be due to a weak output section or feedback loop failure.
Solution:
Test the MOSFET and ensure it’s providing a consistent current. Replace it if it shows signs of wear or failure.
Verify Capacitor 5 and Capacitor 4, as they help stabilize output under load. Replace these if they’ve lost capacitance.
Additional Tips for Repair
Use Proper Tools: Always use a multimeter, oscilloscope (if available), and capacitance meter to verify component health.
Safety Precautions: Chargers operate at high voltage; ensure the charger is unplugged before working on it, and discharge capacitors to prevent shocks.
Test Thoroughly: After replacing components, perform a thorough test by connecting different devices to check voltage stability under varying loads.
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