Belajar Memperbaiki Power Supply VLOG14

Summary

This tutorial by Dwi Arsana demonstrates how to diagnose and repair a faulty power supply for an LCD/LED TV. It covers essential components like the fuse, diodes, MOSFET, and PWM controller, explaining how to test each part using a digital multimeter. Key troubleshooting steps include identifying a blown fuse and checking for short circuits or damaged components like the MOSFET. The tutorial also offers guidance on replacing faulty parts and ensuring the power supply functions properly. Dwi Arsana provides a step-by-step approach to ensure safe and effective repairs, offering valuable insights for those working on TV power supplies.

Takeaways

• 😀 Always remember to check the fuse first when troubleshooting a power supply.
• 😀 Use a digital or analog multimeter to check continuity in the power supply components.
• 😀 Ensure proper grounding before measuring voltage to avoid electrical hazards.
• 😀 Testing the diodes in the circuit can help identify faults in the power supply.
• 😀 If the fuse blows, it might indicate a short circuit in the power supply's active components.
• 😀 Checking the mosfet is crucial, as damage to it can prevent the power supply from functioning.
• 😀 After replacing faulty components, always test the power supply for proper voltage output.
• 😀 Power supplies for LCD/LED TVs often include high-voltage components, so handle with care.
• 😀 A damaged mosfet can cause the power supply to fail, and replacing it can restore functionality.
• 😀 Understanding the basic components of a power supply (like capacitors, diodes, and mosfets) helps in diagnosing issues.
• 😀 Testing the PWM controller and verifying its operation is essential for ensuring the proper functioning of the power supply.

Q & A

What tools are required to check and repair a power supply?

To check and repair a power supply, you will need an avometer (digital or analog), a soldering iron, and a solder sucker (also known as an introvac or solder sacker).

How do you test a power supply using an avometer?

You should set the avometer to continuity mode, which emits a sound when the two probes are connected. If the probes show zero, it indicates a short circuit, meaning the circuit is connected. If the sound is not emitted, it means the circuit is open or disconnected.

What is the significance of the fuse in the power supply?

The fuse acts as a protective device. If there is a short circuit or an overload in the power supply, the fuse will blow to prevent further damage to the components.

What is the first step in troubleshooting a faulty power supply?

The first step is to check the fuse. Using the continuity mode of the avometer, you can verify if the fuse is intact or blown.

What does it mean if the fuse is blown in the power supply?

If the fuse is blown, it could be a sign of a short circuit in the power supply. However, it's important to not just replace the fuse but also check the circuit for underlying issues that caused the fuse to blow.

How do you test the diodes in the power supply?

To test the diodes, you can use the avometer. Place the positive probe on the input side and the negative probe on the output side of the diode. A normal diode will show a reading without a short circuit, indicating proper functionality.

What role does the PWM controller play in a power supply?

The PWM (Pulse Width Modulation) controller manages the mosfets and regulates the switching process, ensuring that the power supply works efficiently by controlling the voltage output.

What should be done if a mosfet in the power supply is damaged?

If a mosfet is found to be damaged (e.g., burned or cracked), it should be replaced with a new one. After replacing it, the power supply should be tested again for normal operation.

What other common issues might occur in the power supply besides a faulty mosfet?

Besides a damaged mosfet, common issues include broken or shorted diodes. If there is no output voltage, it's important to check the diodes, as they may be defective.

What safety precautions should be taken when working with high-voltage power supplies?

When working with high-voltage power supplies, ensure to handle the components carefully, as they may have voltages up to 400V. Always disconnect the power supply before working on it, and take precautions when measuring or testing the components.