I purchased a 2020 Yale ERC045-070VG and when loading it the battery completely died. No power to screen at key. Got it to the shop. Fully charged the NexSys+ battery with its charger. No errors on charger. Sat in seat to turn on, small screen on left lit up and went into a shut down mode. Main screen never lit. Turning on key the is no response. The lights are the only thing working. Is there a fuse I may have blown?