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I  think my bench supply lacked the power needed to run everything at once thus causing the instability. As the bench supply was connected to the battery contacts. But i'll use it like this from now on, it means i can no do some stuff with it. i have a few large clamps and a heatgun, i'll see...

I charged the battery overnight on a 6V car battery charger and tried it out in the portable and that fixes the audio chirping and the instability. I don't think the original PSU is in good shape as the output goes up and down between 7V and 7,5V.

i don't use the original charger or the battery. i use a bench power supply set to 6.5V, 2.2A on the battery terminals. although that could mean that the output of that supply isn't as clean as i thought. i have a battery that should work, and some aftermarket 7.5V PSU that came with this...

I'm having a weird issue with the audio in my portable, it often starts to "chirp" for lack of a better term. sometimes it's a continous chirping sound, sometimes it's random chirping and buzzing. And sometimes it's completly quiet unless it's supposed to make a sound. The chirping will usualy...

so, i have a non backlit mainboard with a backlit screen. it has a card in the ROM slot with i guess the backlight driver and a strange cable. Was this some aftermarket solution or an upgrade to the older models? i sadly don't have a better picture of the display cable, but the wires from the...

i guess the hardest thing in reverse enginering it are those resistor values. i tried to probe around on the hybrid during my troubleshooting, but that really didn't help much without any knowlegde of the actual components. it was more of an accident that i found that short while looking at the...

on my logicboard, 2 traces on the right end of the hybrid were heavily corroded and made an almost short on 2 pins. There is only a Cap on the other end of those (C18 on the logicboard i believe) and it should be high resistense. it also booted sometimes from disk but it mostly failed halfway...

i'm not really an Apple or Mac user at all, i mostly have MS DOS portables, and a few other systems like an Osborne 1 and a Commodore SX-64. The fact that Apple made a luggable Mac was the reason i had to have a working one in the collection. If the previous recapper of this one had paid a...

Hello all, The last few weeks i've been studying the various repair threads of the forum in order to get my own portable running. I'd like to thank everyone here on this forum for providing such a treasure trove of knowledge. Thanks to all that, i now have a working portable. So this is more...