About the serious problem of 3.7v lithium battery series 1N5408 driving 3vLED lamp board burning out?

If you use a 3.7V lithium battery in series with 1N5408 diode to drive a 3V LED panel, and you find that the panel is very hot, there may be several reasons:

1. Overvoltage: The voltage of the 3.7V lithium battery may exceed the rated voltage of the LED light panel, resulting in overload of the light panel and excessive heat generation. You can try to use a lower voltage power supply, or use a voltage regulator to ensure that the voltage is within the appropriate range.

2. Excessive current: 1N5408 diode may not provide enough current limit, resulting in excessive current and overheating of LED panel. You can try to use a more suitable current limiter, such as a current regulator or a resistor, to ensure that the current is within a suitable range.

3. Design problem of the lamp board: There may be design problems in the LED lamp board itself, resulting in serious fever. You can check whether the heat dissipation design of the lamp board is reasonable and whether the heat dissipation material has enough heat dissipation space.

4. Circuit connection problem: Check whether the circuit connection is correct, whether there is short circuit or poor contact. Incorrect connection may lead to excessive current, which may lead to heating problems.

In short, if you encounter serious LED lamp board burning problem, I suggest you carefully check the power supply voltage, current limit and lamp board design, find out the problem and take corresponding solutions. If the problem still exists, it is recommended that you consult a professional or manufacturer for further help and guidance.