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Apple Computing Products:
macOS - Desktop Hardware
iMac G5 20" Power Problems
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<blockquote data-quote="Joematarazz" data-source="post: 1643457" data-attributes="member: 219134"><p>Hello Mac Users, I received this iMac G5 20" no ALS for free with a power problem. Pressing the power button does nothing. Researching online on possible solutions I discovered about the bad caps on the logic board and even in the PSU so I decided to open it up and look inside. Found about 5 caps bulging up so I bought the caps replacement kit on eBay and replaced ALL of them even the ones that looked OK (What a PAIN to remove and put the new ones in that was). Replaced them all and reconnected all but still no luck. Diagnostic light #1 comes on when power is connected.</p><p></p><p>So, I directed my attention to the PSU. This time instead of replacing the caps in the PSU, I decided to buy another one online that claimed to be a working one. Plugged the new PSU in but still no luck. One small difference is that when I press the power button, diagnostic light #2 and #3 quickly flash on then off and nothing. I can hear the PSU make a faint click during the flash. </p><p></p><p>Thinking it was another bad PSU, I decided to buy another one online reported to be in fully working conditions but I have the same problem with the #2 & #3 light flash quickly then nothing.</p><p></p><p>I guess there is still a problem with the logic board but other than reflowing the caps (which I really would like to avoid since they hols on the board a horribly tight) I have no idea what else it could be. </p><p></p><p>Any idea what could cause the diagnostic light 2 and 3 to flash quickly then go off? Possible short somewhere?</p></blockquote><p></p>
[QUOTE="Joematarazz, post: 1643457, member: 219134"] Hello Mac Users, I received this iMac G5 20" no ALS for free with a power problem. Pressing the power button does nothing. Researching online on possible solutions I discovered about the bad caps on the logic board and even in the PSU so I decided to open it up and look inside. Found about 5 caps bulging up so I bought the caps replacement kit on eBay and replaced ALL of them even the ones that looked OK (What a PAIN to remove and put the new ones in that was). Replaced them all and reconnected all but still no luck. Diagnostic light #1 comes on when power is connected. So, I directed my attention to the PSU. This time instead of replacing the caps in the PSU, I decided to buy another one online that claimed to be a working one. Plugged the new PSU in but still no luck. One small difference is that when I press the power button, diagnostic light #2 and #3 quickly flash on then off and nothing. I can hear the PSU make a faint click during the flash. Thinking it was another bad PSU, I decided to buy another one online reported to be in fully working conditions but I have the same problem with the #2 & #3 light flash quickly then nothing. I guess there is still a problem with the logic board but other than reflowing the caps (which I really would like to avoid since they hols on the board a horribly tight) I have no idea what else it could be. Any idea what could cause the diagnostic light 2 and 3 to flash quickly then go off? Possible short somewhere? [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
iMac G5 20" Power Problems
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