Chosen Solution
When I plug the iBook AC adapter, it sounds a very high frequency beep, then the AC adapter turns off. I have tried with another AC adapter but still same problem. No problem when the iBook is working with battery. How do I know if the problem is in the DC-in board or in the logic board? thanks Update I tried all your recommendations (reset PMU,PRAM, removed the memory module and another AC adapter) but no success. I suppose it is not a DC-in board problem because if I disconnect it from the logic board there´s no beep. I think the beep sound comes from the processor area, is that possible? is there some kind of speaker on the logic board??? is very strange because the iBook works well with the battery, so I assume that the processor is not dead. Update 2 I have replaced the DC-in board, the long beep is still there. No success. :( Update 3 -“What country are you in and what is the standard outlet power?” Spain (Europe), 220 Volts, 50Hz. -“Are you using a battery backup?” I use 2 batteries, one from the iBook G3 and one from an iBook G4. -“Describe the tone better. how long does it last? Have you ever heard the tone a battery back up power supply makes when overloaded? Does it sound like that?” 2 links for hear the beep: http://www.megaupload.com/?d=RESISETC http://www.sendspace.com/file/jtaezg the beep sounds untill the adapter hangs. Update 4 Does anyone knows where can I find diagrams schematics of the motherboard of an iBook G3 800 MHz? saludos
Hi! That is a very strange problem! I’ve never run into that one before. Beeps usually have to do with memory problems, either bad memory or the wrong memory, so I’d remove the extended memory and reset the PMU and PRAM, in case that has anything to do with it. iBooks often have the issue of bad memory on the logic board, which there isn’t a good solution for, so hopefully it isn’t that. I would also try another AC adapter, just to rule out that your AC adapter is malfunctioning. I would also try plugging the AC adapter into another power connector, preferably on the other side of the house. I have never heard of an DC-in causing a beeping sound, but from what you’ve described, I wouldn’t yet assume the board is bad. Again, I’d try removing the extended memory and doing the resets, and then try another AC adapter. And then it may be worth trying another DC-in: [linked product missing or disabled: IF150-011-1]
Could you try to take off the ram chip and boot the machine with the DC in board installed ? Who knows, it’s not an usual problem !!
I think you came to the wrong conclusion. If the problem does not exist when the DC port is disconnected then the logic board is not the problem. What country are you in and what is the standard outlet power? Are you using a battery backup? Describe the tone better. how long does it last? Have you ever heard the tone a battery back up power supply makes when overloaded? Does it sound like that?
