Generally speaking, there are three kinds of chips in the back of the LED module:

1 (blue) this is the LED module driver chip, is generally MBI5020 MBI5024… Mainly used to control the vertical LED column
2 (green) this is Manager IC Line. Is generally 4953 LED Driver CHIP each chip to control the 2 lines or 4 lines

3 (yellow) this is a signal amplifier chip, the general is 74HC138

So if the module have a vertical column does not light or the color is not normal, generally blue chips have problems, or contact is not good

If there is a level Line have the problem, it may be a Green Chip problems.