The whole unit board of the led display screen does not light up (black screen)led display ， how to check what is the problem?

1. If several boards in a row in the horizontal direction do not light up, check whether the cable between the normal unit board and the abnormal unit board is well connected; or whether the chip 245 is normal.

2. If several boards in a row do not light up vertically, please check whether the power supply of this column is normal.

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