On 4/27/10 10:28 PM, Mac128 wrote:
When's the last time you adjusted the voltage? There is a fair probability that if your voltage was already low, adding the extra RAM drawing more power caused the circuits to fry while trying to compensate. Plus, I don't know what the effect of not cutting that resistor would have. I would think it would only prevent access to the additional RAM, but you never know. You'll definitely need to replace some caps, if not worse. Get Larry Pina's guide to Macintosh repair. You'll need it.
No, if the voltage setting is a little low and you add some RAM the voltage will only get slightly lower, it won't fry the video circuitry. If the +5 gets low enough it triggers an under voltage protection circuit which forces a reset.
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