PowerBook 180 tunnel bake aftermath

[croissantking]

Good thing they stack nicely.

 

[croissantking]

I got my 180 and have been taking it apart to inspect. I love this part.

Only very minimal corrosion from the battery this time. Almost negligible.

Clean, not too many broken standoffs. Just the usual amount.

4MB RAM card, 80MB HD. Nice - if they work.

Wait, what’s happened to the CPU?

 

[3lectr1cPPC]

Hah! Is that still connected? Doesn’t look that bad surprisingly. May just need some solder touch ups.

 

[croissantking]

It looks connected, just twisted. Not sure how that would have happened - almost seems like vandalism but then nothing else looks out of place.

 

[Sideburn]

I am thinking about replacing the layers of sticky polarizing film on the 180's LCD as is being discussed here: https://68kmla.org/bb/index.php?thr...book-145b-screen-polarizer.40533/#post-508082

Meanwhile, I bought another 180 off eBay for a good price, so I'll have another screen to play with. This will be my 5th 100-series PowerBook purchase.

I don’t think it’s the zebra strips…

 

[croissantking]

I don’t think it’s the zebra strips…

Sorry what do you mean?

 

[croissantking]

I tried to boot the PowerBook as-is, but it wouldn’t boot and some of the components (a diode, transistor and inductor) on the main logic board overheated and melted the plastic sheet below. This has happened to me before.

So, I dismantled it again and tried the parts individually in my working 165. The processor daughtercard works just fine, along with the RAM. The hard drive is stone cold dead, not even an attempt to spin. The floppy I didn’t try and the screen… well…



It tunnels FAST. Way quicker than my other one did. The machine has a musty, damp smell about it so I wonder if that somehow reinforces the moisture theory.


With the screen off you can see how the panel restores itself from the outside in.

 

[3lectr1cPPC]

That definitely adds merit to the moisture theory in my opinion. I’ll add that my 170 was probably the best stored computer I’ve gotten in, judging off the smell. My guess is that it was stored in a climate controlled area/closet in its bag. No tunnel vision.

 

[Sideburn]

Sorry what do you mean?

The white rubber conductive strips on the lcd glass

 

[croissantking]

The white rubber conductive strips on the lcd glass

Ah, but I was talking about the polarizing film that covers the whole display. It's been damaged during baking.

 

[imactheknife]

View attachment 65229

I got my 180 and have been taking it apart to inspect. I love this part.

Only very minimal corrosion from the battery this time. Almost negligible.

Clean, not too many broken standoffs. Just the usual amount.

4MB RAM card, 80MB HD. Nice - if they work.

Wait, what’s happened to the CPU?

View attachment 65230

Someone pressed down with their thumb when inside of it doing something at some point, crazy..

 

[croissantking]

Someone pressed down with their thumb when inside of it doing something at some point, crazy..

Yep, it must be this, but wouldn’t that take an insane amount of force?

 

[croissantking]

So I was playing around with my baked screen again and I’m actually happy with the improved runtime before the corners darken. The baking has made it a more functional display. I’ll probably go for another round and see if I can clear up the symptoms completely. I just hope it doesn’t delaminate too bad.

Meanwhile, I saw this alert:



Found it interesting - especially the part about having to leave it in sleep proportional to the amount of time it was on. It’s similar to the way the tunnelling needs time to reset.