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Question:

LED lamp is not lit, how repair?

LED lamp is not lit, how repair?

Answer:

Generally is a power failure, see the light bead is good, change the power supply
Looking for the warranty, you'd better buy a new one, if not this it hard to fix.
90% is probably the main step-down capacitance is broken, is the middle of the big red, a dollar or so. As for the diode and the probability of electrolytic capacitor bad within 10%, the multimeter amount is known.
Open it before, it is better to measure the voltage and current through the LED and, then open it, each check all key parts: drive or power supply, LED lamp bead, change all the broken lights. And should find out the failure reasons of LED lamp bead, if flow, immediately minish the drive current. Check whether the drive is defective, also want to find out the reason, can the trim, can't repair the replacement.
1, before open the LED, measure the voltage and current through the LED and, 2, then open it, each check all key parts: drive or power supply, LED lamp bead, change all the broken lights. 3, find out the failure reasons of LED lamp bead, if flow, immediately minish the drive current. Check whether the drive is defective, also want to find out the reason, can the trim, can't repair the replacement.

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