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TL;DR: Powerbook 170 boots to checkerboard and repeated chime, about 1s apart, doesn't stop. Backstory: Got this powerbook 170 off of ebay for "untested/as-is" for cheap, no power supply. (For reasons, I thought it might work.) Got a power supply. Plugged in - nothing, no . . no nothing. Removed battery (only very mild beginnings of corrosion, easily wiped off, was a replacement NiCad). Then it powered on! Sort of. I get the powerbook "checkerboard" and the familiar Apple chime (not the chimes of death, the standard "we're good" one), but the chime repeats over and over. The screen never progresses, and the chime never stops until I pull the plug. Sometimes the chime doesn't finish fading out before it chimes again, that's how close they are together. I opened it up, and was somewhat surprised it looked pretty clean - removed the memory, the daughterboard, and inspected the motherboard but didn't find any evidence of chips being blown (no black/brown stains, no bad solder joints, everything looked - pretty good really). The only thing I found that was sort of suspicious was the power jack itself had a slight bit of corrosion on the "lip" that seats the plug in. Not bad, just a little, shouldn't cause what I'm seeing, but that was the only thing I saw. I air-dusted everything, put it back together and - same thing. Any thoughts? Thank you.
PB170 posted a topic in 68k PowerBookHi everyone! I have an old and classic PowerBook 170 that I'm still using (along some more recent equipment, perhaps I should add ). Unfortunately the screen backlight is on its last legs. Since I recently upgraded the storage to a Compact Flash-card (through the amazing PowerMonster II), an upgrade to an LED backlight is very tempting (especially since I, after some basic measurements, discovered that the backlight consumes nearly a third of the total power – much more than the physically moving hard drive). I am of course aware of the fundamental differences between the two technologies and that it's not simply a matter of switching the backlights. I would also like to preserve the machine's current functionality, i.e. allow the backlight to be controlled through software. I realize that this likely is a challenging to near impossible venture, but if it is possible (which it should be) I would very much like to give it a try. To even get close to achieving this, however, I am in need of much more background information than I currently have. So, my question is: does anyone here have any insight or knowledge about what would be required or some bits of information to help me out? Any kind of help or input would be truly appreciated. Below is an excerpt from the Apple's document "Macintosh PowerBook 140 and Macintosh PowerBook 170 Developer" on the display and backlighting (page. 32): In other words, the slider on front of the computer does not directly control the backlight, but instead sends its output to the Power Manager chip, which then adjusts the power to the CCFL. Consequently, the backlight can also be controlled through software (dimming at low battery power etc.). The CCFL connects to an inverter board (onto which the potentiometer that connects to the slider on the case is mounted), which in turn is connected to the machine's interconnect board. Attached are two pictures (top and bottom) of the PowerBook 170 inverter board. The brown two-pin connector connects to the CCFL, and the white 10-pin connector to the interconnect board and the rest of the computer. From what I can tell, most of the inverter board, as expected, seems to be dedicated to power inversion/transformation for the CCFL. It is a little difficult for me to tell what connects to what, but there seem to be ten solder points within the area of the potentiometer (presumably not all for the potentiometer), of which at least two connect directly to the 10-pin connector (at pins 3 and . This basically is where I am at the moment. To sum up, this is what I would like to do: Install an LED backlight that uses the same power source as the current inverter board Keep the full functionality of the brightness adjustment slider (i.e. control through software) Some basic questions I have at this point are: Does anyone know what goes in and out of the 10-pin connector? Could an LED driver board be directly driven by the power supplied through the 10-pin connector? Is there an LED strip available on the market that would be suitable in size for these old PowerBooks? (I haven't yet taken it out to measure it, but would guess its roughly 140 mm / 5.5 in long) Can anyone figure out how the potentiometer could be isolated? Again, if anyone here have any insight or knowledge about what would be required or some bits of information to help me out, any kind of help or input would be truly appreciated. Thank you all in advance! Ps. I have also posted this question in MacRumors' forums, here: http://forums.macrumors.com/showthread.php?p=20533964
I could use some advice on how to get an unusual 170 running again. About a month ago, I won a JLPGA PowerBook 170 only to receive a badly damaged unit. The screen module is fine but the CPU case and bottom plate are cracked, split, and fractured. It is also missing the port door and color-matched feet. The screw anchors have snapped so the logic board connectors are all dislodged. It won't power up completely but the HD spins up and hums along quietly at least and it has maximum RAM. I acquired this PowerBook specifically to use at home and on the go in wacky colorful '92 style, so I would like to repair it. What would the collective mind here do in this situation? Swap the monitor onto a functional 170 body and be content with a colorful screen on a grey body? Look for a 3D printer company to reproduce the damaged parts? Devise a way to color a standard 170 body myself? Something I haven't thought of in my disappointed stupor? I imagine, assuming the board connections are good, that replacement caps will fix the boot failure problem (no POST chime, either)?