Step 1: Inspection of Bulb
The weakest link in the chain is usually an electrolytic capacitor with a working voltage of 400V. When it begins to age, the bulb will not achieve full brightness. Replacing the defective capacitor will often solve this problem.
Almost all E27 bulbs open simply by unscrewing the light bulb's pear-shaped housing. Do it gently to avoid damaging the connecting wires. Carefully pull the circuit board from the bulb. The damaged capacitor is usually inflated and visibly damaged. If possible, read the information on its capacity and voltage. A common value for 3-5W E27 LED bulbs is 4.7μF at 400V.
Step 2: Replacement Electrolite Capacitor
The greatest enemy of LED lighting is the heat that it it generates; it will rapidly shorten the life of the lamps. If the abovementioned capacitor fails, replacing it will usually repair the lamp. However, if an SMD component fails, repairs are usually not possible. In that case, you can buy a new driver board or continue to use the bulb on 11-13V DC depending on the model.
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