Recent content by desertrout

What I like about this particular microscope is the surface... so many of these cheap microscopes have stands that are awkward or effectively useless for board-level work, but this one actually looks useful.

Yeah... boo. :(

I have a blueberry clamshell that needs a lid logo (shocking!) --- someone was selling them on Etsy some time ago, but no longer it seems. Does any know where to get these?

LOL I will too! (I guess I should score some TPU and try this)

Nice find!

Very generous! This is the kind of thing I like to sort out on my own, so don't sweat it. :)

Page 100 (in the PDF) of this Service Guide (https://vintageapple.org/macbooks/pdf/APPLE_MACINTOSH_SERVICE_GUIDE_VOL1_1990.pdf) has a SIMM chart, which might help. FWIW I can't boot my SE (or Portable) from a CD image on a BlueSCSI, or even if there is a CD image on the SD... V1 though. Not...

In my experience... yes, sometimes. Thankfully there's a pot for it. I aim between 7.6 and 7.8 (Service Guide says 7.5 - 7.9)

Mine had 4 caps on the secondary side: https://tinkerdifferent.com/threads/portable-adapter-m5136-capacitor-list.1199/ I also replaced the primary filter cap, but yeah it may not be necessary.

This is still pointing at either bad / cracked solder joints on J4... or a bad harness --- check for corrosion and continuity on the cable that goes between J4 and the logic board

Nice! I keep thinking I should get a hybrid replacement, even though my Portable actually runs pretty well... but battery usage is kinda dodgy - seems to drain quickly and charge inconsistently (it's one of those cheaper replacements, not sure that's part of the problem). Did you go through...

Well, in case any ever needs to know, I just used a 25V cap, considering it's used on the output side which sits somewhere between 7.5 and 8V... and its neighbor was 16V. Here's the complete cap list: Cap # µF V Height Diameter C1 47 400 32 17 C4 22 50 11 5 C302 1000 16 20...

Amazing - thank you so much for documenting this!

I'd say new thread, might make it more 'findable'? Really looking forward to it!

Picked up another PB170 very cheap ($15!), sold as non-booting. Turned out to be the Schottky diode D16. These seems to be a pretty common fault, fails shorted. Symptoms are a non-response to power on, and a dead short at the power connector. The same diode on 160/165/180 logic boards is D15. In...