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Hi Gustavo, the problem is directly in the electronic card, either due to a specific fault with the power supply of those LEDs or by the card controller only the part of LED indicators, it is difficult to burn all the LEDs including the panel of numbers, in any case if it is not repaired, the card would have to be replaced.
the fault is in the card, perhaps they are false contacts in the welds or some open resistance, it will be necessary, to discover the part of welds, removing the transparent silicone and then check with a magnifying glass the welds and the electronic elements, guiding the tracks towards The LEDs and the display, if you do not know how, take it with an electronic technician to repair it, I leave this video:
greetings and luck.