Dragonmint B52 - Hashboard defective!?

[Daniel0913]

Hey dear community, I would need your help. I have a Dragonmint B52 miner. Now it has recently become so that he no longer displays one of the three hashboards. When restarting the miner, all three red lamps of the hashboards look and in the one which is not appear in the config site, the light goes out after a short time .. Does this mean that this board is defective?