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That would save some spendy- in your experience is it a case the RAM itself is usually okay?

Could you give an example? What orientation is “in front “ ? Sorry need a little added color...

For those still following along at home, I pin/pad tested the VIA chip and found a few open where the solder may not have fully flowed. Changed to a Rosin flux pen instead of the tacky gel flux which I kind of prefer and fixed the opens. I had also pulled the SWIM chip so I went and tested that...

I admit I did remove the VIA to look for anything amiss underneath and replaced it. I did have an open on VIA TEST between PMGR and VIA but fixed that. On the PMGR, I have a missing pad on P20 but according to my schematic that doesn't lead anywhere so I ignored it (tell me off I missed...

Well it’s a funny old game where a measure of success is a chime and a Sad Mac code compared to dead silence. But I'll take that as a half step forward(ish). So Mr 360alaska kindly offered a PMGR chip from one of his PB100 boards and that arrived yesterday. I swapped it out for the presumed...

Thanks, looking to see if I can get better access to the latch and slide handle in the core to see if anything needs lubricating or is stuck - my D hooks like fine, so wondering if although the handle itself rises and falls as expected, something else inside isn't following through. I assume you...

I think it’s just one corner got clobbered, if you or anybody has some disassemble instructions for the back cover and handle I’d appreciate some tips. The SS guide doesn’t mention that level of core take apart that I can see.

Just acquired a G4 Cube (bigger and heavier than I imagined from the photos!) but seems there may be some alignment or mechanism issue with the latching (or lack of it). Hand operates normally it would seem but the innards won't stay latched inside the overcoat, even with the handle in the...

Leaving aside the technical we have the moral dilemma should a PB100 give up its silicon life for a Portable....

Actually the same part number according to this but likely different firmware http://mess.redump.net/mess/driver_info/m50753-based_pmu

And of course if I can get this one to start up, I might be back at the Sad Mac code. Remind me why we do this again

Right, after reading further it likely carried different firmware. But if you could pull the code out out of a Portable you might be able to flash it back into a PB 100 PMU. Wait, I’m dreaming again aren’t I ....

interesting read, wonder if the PMU in the PB100 could be substituted...

Does something external to the PMGR initiate that drop ? I guess we need an Evil Genius to reverse engineer that custom chip...

Thanks techknight for the second opinions on the PMGR. I have a dream there is an Indiana Jones warehouse with dusty crates crammed with excess Apple components inventory from when the Portable production line was shut down. And then I woke up screaming.    Apart from obvious voltage abuse, do...

I knew I should have added the disclaimer "this was a before shot for example use only". But I did screw up my pin numbering on the PMGR chip so the ACTUAL reading on pin 37 is a more healthy (?) 5.17v and from there to the major players (GLUs and VIDEO and edge connectors and Q10/11/12) we do...

OK, some coffee onboard. Apologies if this is a dumb question but is this schematic to component mapping correct ?  I also understand my previous question was backwards now - the PMGR *is* the source...

Thank you! I can't quite figure out the source of the SYS_PWR river - if someone can point me in the right direction I could get some readings there and try a jump wire to the PMGR and see if that wakes it up..?

So P37 always showing 2.75v, when power first connected, during PMGR restart buttons held and after reset. Trying a buzz out is interesting - the schematics for Q10,11,13 appear to show all three legs connected but on my board the middle leg is clipped in each case. No buzz on any pins. I did...

I see multiple SYS_PWR on the schematic, like Q10,11,13 but is there a particular one more important?