The lamp beads are not bright and faint?

There are two common situations, one is that the lamp bead is broken, the other is that the battery of the multimeter is not much electricity, a little larger current, the voltage drop is too large, which leads to the root point is not bright LED lamp bead, if the lamp bead is broken, it is necessary to replace the lamp bead in time, if the current is not enough, it is necessary to check whether the voltage transformer works normally, if it is not bright, It is necessary to check the positive and negative pins of the LED lamp bead to see if the LED lamp bead we operate is not correctly connected in the operation, such as the presence of incorrect operation caused by the lamp bead is not bright, then the re-welding lamp bead can generally be solved.