Part 2 Same Led Chip 12W Finalize

Описание: 12W LED bulb chip where only 3 SMD LEDs are working, and install new LED SMDs on the same chip, here’s a clear, step-by-step guide to help you through the process:

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🛠️ Tools and Materials Needed:
• Replacement SMD LEDs (typically 5730 or 5630 for LED bulbs; match with existing)
• Soldering iron (preferably with a fine tip)
• Solder wire
• Tweezer (for handling SMD components)
• Multimeter (to test continuity and LEDs)
• Flux (optional but helpful for clean soldering)
• Solder wick or desoldering pump
• Hot air rework station (optional, speeds up SMD replacement)

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🔧 Step-by-Step Repair Process:

1. Diagnose the Problem
• Use a multimeter in diode mode to test each SMD LED.
• Working LEDs will glow slightly when probed properly (observe polarity).
• Mark all non-functional or open LEDs.

2. Remove Damaged LEDs
• Heat the non-working SMD LEDs using:
• Soldering iron with flux and desoldering braid, or
• Hot air gun to soften solder and lift off with tweezers.

⚠️ Avoid overheating the PCB to prevent lifting pads.

3. Prepare Pads
• Clean old solder using solder wick.
• Apply a small amount of fresh solder to each pad.
• Apply flux to improve solder flow.

4. Install New SMD LEDs
• Use tweezers to position new LEDs correctly (mind the polarity — there’s usually a small notch or arrow mark).
• Carefully solder both sides of each LED.
• If using hot air, gently heat until solder melts and LED seats correctly.

5. Test the Circuit
• Use a multimeter or power up the board using a low-voltage DC supply to ensure all LEDs light up.
• Confirm that the total current and brightness are consistent with a 12W bulb.

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✅ Final Check
• Reassemble the bulb with its heat sink and diffuser cover.
• Power it on with AC mains carefully.
• Monitor for overheating or flickering.

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🧠 Tips:
• LED chips often use series-parallel configurations. If a few LEDs are out, the rest in that series string won’t work.
• Replacing just the faulty SMDs can restore full function without needing a new chip.
• Always match voltage and current rating of new LEDs.



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