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..technically speaking it is working.. :LOL: sticker on the 603e and has some wires soldered, seems stock threw in an old RAM card from another blown up 5300 in which it didnt recognize that card..in this machine it now sees 49MB, guess its 52MB..36MB card with the 16MB onboard.

its like...almost there. nice job with the 180Mhz machine..the correct disassembly..yes, I noticed those amount of specific different lenghts of screws/standoffs and washers, too..I followed this guide very exactly, didnt want to miss any part or mix up parts, because a missing/mixed up...

''.. Stripped down @finkmac suggestion to absolute barebones just components mounted in the frame, no PRAM, no secondary RAM, speaker, and a sketchy heatsink perched on the CPUs - both chime immediately without power switch needing to be triggered. Switched CPUs around to how they came (noting...

I really wonder why so many of those 2400 CPU cards fail, why components cant be replaced..so unreliable

ok, thats cool..from what I've read it depends very much on the individual sample of a G4 you have if you can push it that far.. not tried that. that, additional fan inside the ( emptied) DVD drive, and when this works, maybe just add a little horizontal poti to turn it down or up. I'd look...

the pismo was a quite capable G3 machine back then, fanless..but a G4 is quite another thing heatwise. I guess you did some research on that mod and experiences with it before? may try to get something like this working in the CD bay?

do you have a photo before the repairs/ ultrasonic cleanings? it helps locating spots for clues

maybe the quarz crystal got damaged during the multiple ultrasonic cleanings, or was it removed before that..

did you get the replacement Schottky yet? I guess you already tried connecting the power adapter and power on with pressing Control+Command+Power and immediately reset the PRAM on the first sound.

make sure the CPU,RAM and ROM boards are seated in firmly..do you have a spare CPU, maybe it is dead. and when the Schottky was dead, something was causing this.

to check if it is indeed a thermal problem I would run it full speed with the case opened, then do some stress tests. If theres no problem, it is heat related. I once build a HackIntosh from my QS with an Gigabyte M-ATX board, 450W power supply and a GeForce 7600GT in it. Did cut some extra...

thats the thing I was thinking,too.. and yes, my 1400/2400/3400 work with CF cards and adapter,too..but I sometimes prefer to use a new(ly) good IDE drive instead. so install back the IDE drive and after boot pop in a CF card in the PCMCIA slot and see if it is being recognized/formatable

right..other than a real hardware mod..

I‘m looking for tool similar to Phipli‘s Soft-475 but for PPC..there's also ZDNet Clock, MacPro Overclock Tool for Intel Macs but I couldnt find anything for 603e PPC ( as in powerbook 5300)

Oh, the 540c, I misread, sorry, I thought you meant the 5300. On the 540c I did a repaint job, it‘s a 540c black coffee edition now😏

try to identify the original quarz, I'm not sure what the specs are, 3V or 5V.. it seems to be a vintage Epson part? but the small label on it is also on Seiko crystals ( of course the package size and footprint are different) original quarz Epson Seiko

I think the later revisions of the 5300 had darker colored plastics than the earlier ones?

it looks ok, could use a recap of course but it still is bright and clear

I'll try to to speed up the PPC chip up to 117 Mhz via 38 Mhz crystal or resistor re-arranging. from here ( https://alksoft.com/5300_overclock.html) the way via the resistors is free( no parts ordering) but..they are TINY..I mean really tiny. and finding a matching 38 Mhz four pin quarz is...

after some more scratching and cleaning reassemble time and first test boot.. has 8.1 on it and MS Office but wait..maxed out 64 MB RAM, a surprise.. at least something to speed up the cacheless 1995 wonder a bit. I put in a 64GB SD card, copied 8.6 on the first partition and after that...