128K, 512K, Pluses and SE's rarely need a logic board recap. But they do need work on the analog board. Check for cracked solder connections on harness connectors to the logic board and the crt yoke. Desolder the bad solder, clean up the area and resolder with fresh flux and solder. If you just reheat the joint and reflow the old solder, it will break again and break in a short amount of time. Fresh Soldering will keep the connection going for years.