At home, a 7W warm white LED E27 head is not lit, in any case, it will be broken, and the spirit of dismantling and dismantling will be dismantled. I don’t want to find that the E27 lamp part does not touch a wire and cause no electricity, so the lamp is removed. It became a light repair. 
The way it was before (in fact, this is another one of the same lights, the fixed lamp is too lazy to be placed in the table lamp)
Disassemble the front lampshade
LED part close-up
Ready to remove the lamp cap
Unpacking and finding a line without tin, doubt whether it is a contact problem
In this way, the direct crimping head ensures that the light is in contact with the lamp, and the inside of the lamp is lit.
In fact, such a lamp is generally not too easy to damage the LED part, either the contact is bad, or the rectification part is bad. Inside is the simplest resistor-capacitor buck regulator module, a current-limiting buck resistor and capacitor, and 4 diodes. One capacitor and several resistors are formed. I forgot to take a photo. I will have the opportunity to dismantle it again next time. So if I see a bad one, it will be really broken. I can also remove the components. Aluminum heat dissipation is of course better. The power is generally sufficient. The molded case is generally made of medium and small power lamp beads (such as 3528 3014 2835). The current control is small. In order to reduce the temperature, the current must be reduced, so the power is mostly insufficient. The price of cabbage in plastic shells is popular among the people, so there is a big market (most LED lighting manufacturers will have a tendency to enter this market). The price of aluminum heat is high, and commercial use is mostly.
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