Causes and preventive measures for LED
Date：
2025-07-11
LED packaging segment products, using Sanan chip packaging, power 1W0.2w 1.5W, luminous angle 120°, luminous color RGB white light, red light, green light, blue light two-color, three-color, 3528RGB lamp beads features: moisture-proof, anti-sulfurization, anti-dead light, good heat dissipation, low light decay,
Mainly used in lighting, 3C indicator lights, display screens, automotive interiors, etc.
When manufacturing 2835 lamp beads, a small mark is usually marked on one side (long side or bottom), such as: missing corners, dots or bulges. Most manufacturers indicate this mark as the position of the cathode when manufacturing.
Digital multimeter, select the diode mode, touch the two ends of the LED with red and black test leads. When the LED is lit, the one in contact with the red test lead is the anode, and the other end is the cathode. *If you look at it, take it out and see if there is
Measure with a voltmeter, select the maximum range of the voltmeter, connect its switch in series with the two poles of the power supply with a wire, quickly disconnect and close the switch. If the pointer of the meter is found to deflect in the positive direction, it means that the positive connection of the voltmeter is the cathode, otherwise it is the cathode
Method 5, refer to the circuit board or welding point (the LED chips have been welded on the circuit board)
Observe the welding points on the circuit board or the direction of the copper foil to judge the positive and negative poles. The copper foil flows from the positive pole to the negative pole.
In practical applications, the difference between positive and negative poles depends on the actual situation.
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