Editing Macintosh SE Troubleshooting (section)

== Power supply and startup ==

The SE was fitted with one of two switch-mode power supplies (an international/Astec type and a Sony type). A tired PSU shows as no start-up, a repeated ticking/clicking, or unstable rails; recap or substitute the supply and confirm '''+5&nbsp;V''' (4.90&ndash;5.10&nbsp;V) and '''+12&nbsp;V''' before chasing logic-board faults.<ref name="mac_compact">[https://recapamac.com.au/ Recap-a-Mac] and the [https://68kmla.org/ 68k Macintosh Liberation Army (68kMLA)] forum &mdash; community references for compact-Macintosh power-supply, analog-board and capacitor faults.</ref> The SE shares its analog board with the [[Macintosh SE/30]]; the detailed analog-board and minimal-boot diagnostics on the [[Macintosh SE/30 Troubleshooting]] page apply directly.