Macintosh LC 550

The LC 550 is the fastest Motorola 68030 based model of the all-in-one design. The Macintosh LC 575 which replaces this is powered by the Motorola 68LC040. The LC 550 was also sold under the "Performa" name.

Like other models in the LC 500 series line, the 550 was available without an internal CD-ROM drive. This seemed to be a cost-saving option for the educational market.

Notes

• Apple part number 820-0368-A applies to the LC 550 logic board.
• You can exchange the chassis harness assembly of the LC 520 or LC 550 with the newer chassis harness assembly of the LC 575. The newer chassis harness assembly requires the manual-inject floppy drive and caddyless CD ROM drive.

Troubleshooting/Repair

Capacitor replacement (logic board)

The SMD capacitors on the logic board will most likely have already started leaking electrolyte out the bottom, and failing to replace them in a timely manner will result in further leakage with possible damage to nearby components. See below list of capacitors to replace (needs verification - might be LC 520 board):

• 6 x 47uf 16V
• 2 x 100uf 6.3V
• 1 x 10uf 16V

Diagrams/Schematics

Documentation

• Macintosh LC 520/550/575 Service Source

Gallery

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External Resources

• https://cdn.preterhuman.net/texts/computing/Apple_Service_PDF/68k_Macintosh/lc_520.550.575.pdf - Apple Service PDF

See Also

• Apple Computer

The Macintosh LC Series from Apple Computer

Macintosh LC -- Macintosh LC II -- Macintosh LC III -- Macintosh LC 475 -- Macintosh LC 520 -- Macintosh LC 550 -- Macintosh LC 575 -- Macintosh LC 580 -- Macintosh LC 630