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| Author | Need help diagnosing PB3400c that is acting very erratic. (Read 2604 times) | ||||||||||||||||||
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BigBang
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on: June 13, 2007, 03:32
Hi, Please click on this link to view a short video on the YouTube site, of my sick PB3400c: Sick PB3400C Last night after jiggling the power connector in the back power port, I was able to ressurect my lifeless PB3400c. It was temporarily stuck in this loop for about 10 mins before finally showing the Desktop. The noises you hear on the short video are just an example of the array of sounds that I heard during that 10 mins. It sounded like a kids toy laser gun that goes through a set of sound effects before starting at the beginning again. I booted from the install disc and received this error: "The built in memory test has detected a problem. Please contact a service tech for assistance." The PB is booting/shutting down properly again, but the clicker refuses to function. The clicker was already sagging but still worked fine. Now I can't use it at all .... Can anyone shed any light on my next possible move? I've gone from wanting to toss it in the bin to wanting it to be user friendly again. I'll add that it took a lot of perserverance and jiggling of the power connector to bring this PB back to this world. |
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wove
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1024 MB  Posts: 1363 
Reply #1 on: June 13, 2007, 14:27
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I assume this is the same Powerbook that had the material on the motherboard near where the backup battery was which is brought up in this thread. You should try and clean that off. I would use alcohol and a soft tooth brush to scrub it off, then rinse with water and let it dry very well. Apple designs tend to incorporate the sound circuitry into the same subsystem as the power management. The sounds seem very similar to sounds associated with a failing capacitor in an amplifier. I would suspect that your trouble is too substantial to corrected by wiggling connectors. I would clean the area thoroughly hope that creates improvements. If it does not my guess is you will need to replace the damaged board. bill
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BigBang
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Reply #2 on: June 14, 2007, 12:47
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Hi, thanks for your reply. The PB is running smoothly again. I cleaned the logic board and I didn't wreck anything in the process! The trackpad button had broken into 3 pieces and I dissassembled the PB so I could remove the button and I glued the 3 parts back together and it all works fine again! I reconfigured the Trackpad to open items with two light taps so there is less impact on the button. The added RAM module has failed and is no longer recognised so I removed it. I tried to boot from the Disc Tools floppy but it was ejected at startup so I couldn't use it. I wonder if this is a 7.6.1 thing? Apparantly I can't boot from Floppy unless it's a System floppy? Wonder why there's a disc tools floppy then? It says Macintosh Powerbook 3400 series on the floppy. Anyway I have the system install CD so I unmounted the HD and used the CD as it has Disc Drive on it also. So it seems things are back to normal again ... although I need a new trackpad button, and more RAM if I'm to surf the net comfortably as the onboard 16mb is painfully slow when the web pages are loading. Regards. Martin
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BigBang
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Reply #3 on: June 14, 2007, 12:51
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Oops I forgot to add an image of the cleaned up logic board. I did as best as I could on it. (http://img185.imageshack.us/img185/2571/aftercleanupkx6.th.jpg) There doesn't appear to be an edit post button on this forum, or if there is, I can't see it.
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wove
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1024 MB Posts: 1363
Reply #4 on: June 16, 2007, 02:55
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Nice job on getting your 3400 back into working condition. I think the PB 3400 was probably Apple's most rugged PowerBook. Today 16MB of RAM seems almost ridiculously small. Yet at the time, the 16MB of RAM would be seen as adequate. Yet of course more RAM even then was viewed as a good thing. bill
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