Since the LED light strip is a series-parallel structure, when a short circuit occurs in a group of circuits, the voltage of other LEDs in the same group will increase, the brightness of the LED will increase, and the corresponding heat generation will also increase. . The most obvious is that in the 5050 light strip, when any chip circuit in the 5050 light strip is short-circuited, the current of the short-circuited lamp bead will double, that is, 20mA becomes 40mA, and the brightness of the lamp bead It will become very bright, but at the same time, the heat will increase sharply, and in severe cases, the circuit board will be burned within a few minutes. However, because this problem is relatively obscure, it is generally not noticed, because the short circuit does not affect the normal light emission of the light strip. Visual inspection, if you only do electrical testing, often ignore this problem, which is why many LED strip manufacturers always encounter customer complaints that the product is hot but can't find the reason.

GHK IP20 LED BATTEN

Solution:

1. Circuit design: Make the wiring as wide as possible for the circuit. The distance between the lines is 0.5mm, and the rest of the space is best to be filled. The thickness of the copper foil should be thickened as much as possible without violating the customer's requirements for the total thickness of the circuit board. The general thickness is 1~1.5 OZ

2. Production process:

A. When printing solder paste, try not to allow tin connection between pads to avoid soldering short circuit caused by poor printing;

B. Avoid short circuit when patching

C. Check the patch position before reflow

D. After reflow, do a visual inspection first to ensure that there is no short circuit in the light strip, and then do an electrical test recheck. During the recheck, pay attention to whether the LED is abnormally bright or abnormally dark after it is lit.