Jump to content
redruM69

Mac Portable troubles

Recommended Posts

Possible, or the specs are slightly different and its working in that circuit. 

 

Who knows, these machines are highly finicky. I am just happy that is working ;-)

Share this post


Link to post
Share on other sites

IMG_7336.thumb.jpg.1b5ec24e922b5ce4a4fcb18194615d38.jpg

Hi Everyone,

 

I just want to thank everyone for their help on this project. I am slowly trying to bring to life all the old Macs/Newtons/Apple II computers (and a few NeXTs) that I ever owned. This was one of the first projects. I've been lurking on the site for some time just reading and re learning things that I've forgotten. The portable involved replacing the battery and getting the board recapped. Thanks to those who helped me with that. Thank you to Technight for patiently answering my questions. I did not have the technical skill to go any further on the project. However, I found redruM69 while solving a separate problem (a hard drive replacement for the portable) and he offered to break down my portable and see if he could fix it. What an incredible job he did. I can't recommend redruM69 enough. He kept me updated at every step along the way and when he ran into a dead end, found a way to solve the issue. Attached is the portable returned to me and running super fast due to a SCSI2SD hard drive replacement.

 

As someone very new to computer restoration, a big thank you to all the help everyone gives on the boards and in person. I for one very much appreciate it.

Edited by PaloAlto
typo

Share this post


Link to post
Share on other sites

Terrific outcome!

I hear you about relearning forgotten things!

I'll be tackling my Portables soon. They've been in the closet for many years now.

Share this post


Link to post
Share on other sites

Update on this project.  I shipped it back to the customer and all was right as rain for a couple of weeks.  It then reverted back to the same symptom!  This board appears to be blowing opamps pretty quickly.
I think we've come to the conclusion that its best we wait for another board to pop up, and swap it out.  This one is just not reliable.

Share this post


Link to post
Share on other sites

In order to back up that theory I would suggest lifting the output pins on the op-amp, and putting an ammeter in between to make sure the op amp isn't driving too much current, because that would cause an op-amp burnout, otherwise its not blowing op-amps. there is something else wrong as I said in the beginning. 

 

I haven't had alot of luck with boards that did this. at least not much. 

 

 

 

 

Edited by techknight

Share this post


Link to post
Share on other sites

Thanks everyone for the help. I am certainly learning as I wade deeper into my pile of old Macs. This portable has been particularly frustrating because it actually worked for a few weeks without any problems. It is the M5126. As I look for replacement boards, will the main board of the M5120 work as a simple swap or do I need to find an M5126 board?

 

Thanks

Share this post


Link to post
Share on other sites

You would have to make a display cable adapter in order to fit a 5120 board in a 5126, and then you need the inverter control card. 

 

I did full photo documentation of that card, as well as doing pinouts of both displays however I have had no time to compile the information into anything legible. 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×