Driver Operated 12W Led Chip Faulty #ledbulb

Checking a 12W Driver-Operated LED Chip with Multiple Burnt-Out SMD LEDs Using a Multimeter

When a 12W LED chip (SMD-based) stops functioning or shows signs of multiple SMDs being burnt out, it’s essential to diagnose the fault before replacing or repairing. Here’s how to perform a systematic check using a digital multimeter:

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🔍 Tools Required:
• Digital Multimeter with Diode Test Mode
• Optional: Variable DC power supply (for advanced testing)

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⚙️ Procedure:

1. Safety First
• Disconnect the LED chip from the AC mains.
• Discharge any capacitors in the driver circuit to avoid shock.

2. Visual Inspection
• Look for burn marks, darkened SMD LEDs, or cracked/bulged components.
• Burnt-out LEDs often appear darker or have a visible internal break.

3. Test SMD LEDs with Multimeter (Diode Mode)
• Set your multimeter to Diode Test Mode.
• Place the red probe on the anode (+) and black probe on the cathode (–) of each SMD LED.

Interpretation:
• A healthy LED will typically show a forward voltage drop (e.g., 1.8V to 3.2V, depending on LED type).
• An open circuit (no reading or OL) indicates a burnt
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