How to judge a LED card is broken?
Visually observe whether there is a lack of components, damaged, if there is a short circuit chip burn through, whether by the lightning.
Judging from light, red light is power lamp, green light is a signal lamp.
The red light can be judged the card’s power supply circuit is normal or not, the power supply under normal circumstances, can pull off the power of sending card, then observe if the green light has a very short time to flash; If it can flash, then can judge sending card’s underlying program hasn’t been lost.
Otherwise, the means to sending card was lost the underlying program, need repair.
