Editing Atari Portfolio Capacitor Replacement Guide (section)

== Capacitor Functions and Failure Symptoms ==

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{| class="wikitable styled-table"
|+ Capacitor Failure Symptoms
|-
! Capacitor(s) !! Function !! Failure Symptom
|-
| C1, C2 || Main power filtering || Unit fails to power on, intermittent resets, unstable operation. May appear to work briefly then cut out.
|-
| C3 || Regulator output || Erratic behaviour, random crashes, peripherals not working correctly.
|-
| C4, C5, C6 || LCD bias voltage generation || Display appears blank even though the unit is running (key clicks audible). Contrast adjustment has no effect. If measured, the LCD bias voltage (normally ~-15V to -20V) will be absent or severely reduced.
|-
| C7 || Memory backup (supercapacitor) || C: drive data lost '''immediately''' upon battery removal (instead of the normal ~1–2 minute grace period). If this capacitor has failed, battery changes will always result in data loss.
|}