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After installing a new 3V battry on the motherboard of my 54855a, the unit will not power up. If I put the old (dead) battery backin the unit will power up. On initial power up, the unit desplays a checksum error. After pressing F1 on the keyboard, the un

Question asked by JohnZ on Feb 4, 2020
Latest reply on Feb 24, 2020 by nltech8

Any ideas?