Editing Apple Lisa Troubleshooting (section)

== No Power / Dead System ==

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[[File:Apple Lisa (photo).jpg|thumb|right|300px|Apple Lisa. Source: Wikimedia Commons.]]
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|+ '''No Power Diagnostics'''
|-
! Symptom !! Possible Cause !! Recommended Action
|-
| No response when power switched on || Failed RIFA safety capacitors || Inspect and replace RIFA capacitors in power supply
|-
| Clicking or ticking from power supply || Power supply overload or short || Check for shorts on motherboard; replace power supply capacitors
|-
| Trips circuit breaker || Shorted RIFA capacitor || Replace all RIFA safety capacitors immediately
|-
| Power supply smokes || RIFA capacitor failure || Disconnect immediately; replace all safety capacitors
|-
| Intermittent power || Failing electrolytic capacitors || Full power supply recap recommended
|-
| Powers on briefly then shuts off || Power supply protection circuit triggering || Check for shorts; verify output voltages
|}

=== RIFA Capacitor Failure ===
RIFA-brand safety capacitors are the most common cause of Lisa power problems:
* These capacitors absorb moisture over decades and fail catastrophically
* They may emit smoke, loud pops, or acrid smell when failing
* ALWAYS replace preventatively before powering on a long-stored Lisa
* Replace with modern X2-rated capacitors of equivalent value