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Triathlete · Jan 8, 2005, 08:01 AM

I want to open to look inside and change logic board, only if its easy access. I remove screw on the back and side but it definitely wont open. Where are the other screws. Any one have experience with this, or is it just a bad idea?
Warranty is out. Do I lose info if i remove the logic board?
Thanks to anyone who can help.

f1000 · Jan 8, 2005, 10:36 AM

First of all, which model PowerBook are you talking about?

Second of all, if it's a recent model PowerBook (aluminum), then yes, there are several screws that you have missed. There are two screws under the keyboard as well as a long black screw in the memory compartment. It is generally not a good idea to disassemble an AluBook without at least some kind of road map of the innards. There are a LOT of screws to keep track of.

http://forums.macnn.com/showthread.p...hreadid=238496

Triathlete · Jan 8, 2005, 10:49 AM

I have a 17PB 1yo as of nov2004. Is there any way to verify why the sound does not work. I ran the AHT and showed error code 21ss/1/5:ox42(5).
If I can repair myself, i will, If not I am trying to find a place to repair. Not many apple repair stores in Montreal.

bighead · Jan 8, 2005, 11:07 AM

I wouldn't bother opening your machine. It's not worth the additional damage you can cause.

When changing the board, you not only need the correct thermal pads for the CPU and controller, you also need the correct thermal paste. The only one that Apple certifies for use with the Radeon 9700 chipsets is a special compound from ShinEtsuMicrosi. Not even the previous types of thermal compound from G4 towers and G4 iMacs are certified for the Radeon chipset in those PowerBooks.

I'd bite the bullet and find a repair center, or call Apple Canada and set up a mail-in repair.

f1000 · Jan 8, 2005, 11:20 AM

Originally posted by Triathlete:
I have a 17PB 1yo as of nov2004. Is there any way to verify why the sound does not work. I ran the AHT and showed error code 21ss/1/5:ox42(5).
If I can repair myself, i will, If not I am trying to find a place to repair. Not many apple repair stores in Montreal.

I don't know what that error code means, so I couldn't tell you if simply replacing the sound card could fix your audio problem. Here's a guide on how to replace your sound card if you should decide to do so yourself, http://pbfixit.com/Guide/55.7.0.html

You can buy a replacement sound card here, http://www.pbfixit.com/cart/catalog/...ound_Card.html

Triathlete · Jan 8, 2005, 01:46 PM

I followed these intructions and looked around and closed it, but now it does not turn on at all. Is there a connection i need to connect fomm the keyboard top panel to the bottom when closing the Pb. The on button is not turning on the computer.

f1000 · 02:15 PM

CMOS chips are VERY sensitive to electrostatic discharge, which is an ever present threat during dry winter months.

Try replugging in your keyboard, and please be very patient when fiddling around with your PowerBook. Also, make sure that you have reinserted any cables, RAM chips, or AirPort cards properly. You may simply have a loose hard drive cable. If you tore a cable or zapped a chip, though, then I'm afraid you're out of luck.

Triathlete · Jan 8, 2005, 02:21 PM

What do you mean replugging the keyboard. I opened it but did not touch anything, so i did not disconnect any cables. i plugged in the computer and tried to turn it on, but it does not work now.
Help

Triathlete · Jan 8, 2005, 03:03 PM

Thanks, i forgot to plug in keyboard. DUH! i did not notice that i had unplugged it because i had not removed the ram chip.
It works, but still no sound. I will have to get it diagnosed to find out if it really is the sound card that is defective before changing it.

urrl78 · Jan 8, 2005, 09:41 PM

If you can hear stereo sound with earphones it could be a blown speaker. Have you been playing it loudly? I never turn my laptop up Max volume unless I have to.

Triathlete · Jan 9, 2005, 11:20 AM

earphones dont work either, no chimes no sound effects. I ran AHT and showed error code of logic board 21ss/1/5:ox42(5). I dont know if the sound card or speakers is part of the logic board test on AHT. The volume buttons f3 f4 f5 are slow also for the volume change. I really dont know what to make of this.

bighead · Jan 9, 2005, 01:27 PM

Originally posted by Triathlete:
I really dont know what to make of this.

How about taking it to have the logic board replaced?