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Home Forums Powerbook 150 - screen is blank — #19 Powerbook 150 - screen is blank — #19
Post #19 by joe4227@sympatico.ca
Source ForumPowerbook 150 - screen is blank — #19
CategoryHardware
Post DateTue, 21 Aug 2012 - 01:25
Original URLhttps://68kmla.org/bb/threads/powerbook-150-screen-is-blank.26038/
Post
I will look for a good screen first, and possible a "for parts" machine with the Interconnect board.

The main prob with these old machines is the decay of the poor quality plastic. I think Apple was trying use biodegradable stuff.

So the first thing that happens when you start working on them is that the mounting posts crumble, then the hinges. Nothing good epoxy won't patch.

The caps on the LCD are the same type of SMC that Trag uses for recapping, and there aren't very many from what I saw.

Would like to try "troubleshooting the screen. If I knew the pinout, I could use a digital signal pulser to strobe the leads and see if it produces anything on screen.

That would show whether the prob is the screen, of something in the Jedi Connect chain, or possibly the MB...

Should also be able to look at waveforms form the MB, as it does appear to boot. But will have to dig my scope out of deep storage to do that! We moved about a year ago, stuff is still in boxes!

mp.ls