Try this sequence in order below or as an additional resources for restoring .mdb file see and learn following topics, and in case your corruption is severe, one more solution must assist you https://www.repairtoolbox.com/accessrepair.html
The repair method attempts to recover only the tables, indexes and queries in the database. Do not attempt to repair damaged forms, reports, macros and modules. Before executing the Compact and Repair tool, please ensure the following condition:
- Do not open Access database must closed
- Sufficient storage space available - minimum double in size of your Access database on that Disk.
- Close the .mdb file related to .ldb file before you delete the .ldb file.
- Then Run the Compact and Repair tool