Power Macintosh 6500 Troubleshooting: Difference between revisions

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[[File:Power Macintosh 6500 (photo).jpg|thumb|right|300px|Power Macintosh 6500. Source: Wikimedia Commons.]]

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|+ '''Power Issues'''

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* '''Reset PRAM:''' Hold Cmd+Option+P+R during startup until you hear a second chime

* '''Replace PRAM Battery:''' The 4.5V alkaline battery may be depleted

== ⚠️ PRAM battery ==

The Power Macintosh 6500 uses a 3.6 V 1/2AA lithium PRAM battery that leaks and can burst, corroding the logic board. Remove it from any un-serviced unit and clean/repair any leakage before troubleshooting.<ref name="ppc_batt">[https://68kmla.org/bb/threads/warning-exploding-maxell-pram-batteries.25169/ 68kMLA — Exploding Maxell PRAM Batteries]. Source for the leaking/exploding 3.6 V lithium PRAM battery.</ref>

== ⚠️ Recap (logic board and PSU) ==

The Power Macintosh 6500 uses aluminium electrolytic capacitors on both the logic board and the power supply, and they leak with age. Recap and clean both boards as a first step; the large '''2200 uF''' PSU filter capacitors in particular are a known failure point, giving a dead machine, failure to power on, or instability.<ref name="pmcap">[https://recapamac.com.au/powermac-6100/ Recap-a-Mac — Power Macintosh 6100]; Badcaps "Macintosh 6100 power supply"; and the Apple Performa/Power Macintosh 6400/6500 Service Source. Source for the logic-board and power-supply electrolytic failures (including the 2200 uF PSU capacitors) and the recap.</ref>

== References ==

== Component-level faults (deep dive) ==

=== Surface-mount capacitor leakage ===

The Power Macintosh 6500 logic board uses surface-mount electrolytic capacitors whose electrolyte turns corrosive with age and creeps across the board, eating through traces, pads and IC pins. Typical signatures are a machine that will not chime, chimes but shows no video, plays distorted or missing audio, or shows a garbled or checkerboard screen. Wash the affected area and replace every electrolytic with a tantalum or polymer part, then repair any lifted traces. The switch-mode power supply (ASTEC or TDK on the LC-family machines) holds its own electrolytics and fails the same way, so recap it alongside the board.<ref name="caps">Mac84, [https://mac84.net/web/macintosh-lc-series-lc-lc-ii-lc-iii-power-supply-recapping-guide-astec-usa/ Macintosh LC series power-supply recapping guide]; the [http://www.maccaps.com/MacCaps/Capacitor_Reference/Capacitor_Reference.html MacCaps capacitor reference]; and iFixit. Source for surface-mount electrolytic leakage eating traces, pads and pins, the ASTEC/TDK LC power-supply cap failures, and Apple's use of tantalum (non-leaking) capacitors on the Quadra 700/900 logic boards.</ref>

=== PRAM battery ===

The Power Macintosh 6500 backs up its clock and Parameter RAM from a 3.6 V ½AA lithium cell. These cells — red Maxell parts especially — leak or burst and corrode the board, so remove an aged one on sight. A flat cell can also stop a soft-power machine booting or disturb the video; left plugged in, trickle power preserves the settings, but a machine switched off at the wall with a dead cell loses them. Clean the area and fit a fresh 3.6 V cell.<ref name="pram">[https://68kmla.org/bb/threads/warning-exploding-maxell-pram-batteries.25169/ Warning! Exploding Maxell PRAM batteries], 68kMLA; and [https://www.macdat.net/repair/kb/batteries_macintosh.html Mac Battery Leaks], MacDat. Source for the 3.6 V ½AA lithium PRAM cell, the Maxell leak/explosion board damage, and soft- versus hard-power PRAM retention.</ref>

=== Boot chime and Sad Mac ===

Read the start-up sound first: a normal chime with a black screen points to the display path or the monitor, an absent chime or a "chord of death" points to RAM or a core fault, and a Sad Mac shows a numeric code — see [[Sad Mac Error Codes]].

== Related Pages ==

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+[[File:Power Macintosh 6500 (photo).jpg|thumb|right|300px|Power Macintosh 6500. Source: Wikimedia Commons.]]
 {| class="wikitable styled-table" style="width:100%; text-align:center;"
 |+ '''Power Issues'''
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 * '''Reset PRAM:''' Hold Cmd+Option+P+R during startup until you hear a second chime
 * '''Replace PRAM Battery:''' The 4.5V alkaline battery may be depleted
+== ⚠️ PRAM battery ==
+The Power Macintosh 6500 uses a 3.6 V 1/2AA lithium PRAM battery that leaks and can burst, corroding the logic board. Remove it from any un-serviced unit and clean/repair any leakage before troubleshooting.<ref name="ppc_batt">[https://68kmla.org/bb/threads/warning-exploding-maxell-pram-batteries.25169/ 68kMLA — Exploding Maxell PRAM Batteries]. Source for the leaking/exploding 3.6 V lithium PRAM battery.</ref>
+== ⚠️ Recap (logic board and PSU) ==
+The Power Macintosh 6500 uses aluminium electrolytic capacitors on both the logic board and the power supply, and they leak with age. Recap and clean both boards as a first step; the large '''2200 uF''' PSU filter capacitors in particular are a known failure point, giving a dead machine, failure to power on, or instability.<ref name="pmcap">[https://recapamac.com.au/powermac-6100/ Recap-a-Mac — Power Macintosh 6100]; Badcaps "Macintosh 6100 power supply"; and the Apple Performa/Power Macintosh 6400/6500 Service Source. Source for the logic-board and power-supply electrolytic failures (including the 2200 uF PSU capacitors) and the recap.</ref>
+== References ==
+<references />
+== Component-level faults (deep dive) ==
+=== Surface-mount capacitor leakage ===
+The Power Macintosh 6500 logic board uses surface-mount electrolytic capacitors whose electrolyte turns corrosive with age and creeps across the board, eating through traces, pads and IC pins. Typical signatures are a machine that will not chime, chimes but shows no video, plays distorted or missing audio, or shows a garbled or checkerboard screen. Wash the affected area and replace every electrolytic with a tantalum or polymer part, then repair any lifted traces. The switch-mode power supply (ASTEC or TDK on the LC-family machines) holds its own electrolytics and fails the same way, so recap it alongside the board.<ref name="caps">Mac84, [https://mac84.net/web/macintosh-lc-series-lc-lc-ii-lc-iii-power-supply-recapping-guide-astec-usa/ Macintosh LC series power-supply recapping guide]; the [http://www.maccaps.com/MacCaps/Capacitor_Reference/Capacitor_Reference.html MacCaps capacitor reference]; and iFixit. Source for surface-mount electrolytic leakage eating traces, pads and pins, the ASTEC/TDK LC power-supply cap failures, and Apple's use of tantalum (non-leaking) capacitors on the Quadra 700/900 logic boards.</ref>
+=== PRAM battery ===
+The Power Macintosh 6500 backs up its clock and Parameter RAM from a 3.6&nbsp;V &frac12;AA lithium cell. These cells &mdash; red Maxell parts especially &mdash; leak or burst and corrode the board, so remove an aged one on sight. A flat cell can also stop a soft-power machine booting or disturb the video; left plugged in, trickle power preserves the settings, but a machine switched off at the wall with a dead cell loses them. Clean the area and fit a fresh 3.6&nbsp;V cell.<ref name="pram">[https://68kmla.org/bb/threads/warning-exploding-maxell-pram-batteries.25169/ Warning! Exploding Maxell PRAM batteries], 68kMLA; and [https://www.macdat.net/repair/kb/batteries_macintosh.html Mac Battery Leaks], MacDat. Source for the 3.6&nbsp;V &frac12;AA lithium PRAM cell, the Maxell leak/explosion board damage, and soft- versus hard-power PRAM retention.</ref>
+=== Boot chime and Sad Mac ===
+Read the start-up sound first: a normal chime with a black screen points to the display path or the monitor, an absent chime or a "chord of death" points to RAM or a core fault, and a Sad Mac shows a numeric code &mdash; see [[Sad Mac Error Codes]].
 == Related Pages ==