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@mdeverhart Between pin 22 and 28(5v) its 508 ohms And pin 22 and gnd is 521 ohms. Pin 27 goes from under the sram ic through a via and then a track on the other side to another via and up under the asic. Ive checked the other asic/sram combo as its the same setup. and pin 27 to gnd is 456...

Will check ☺

Yeah did that.. it's a straight connection.. only other thing I can think of doing is lifting pin 71 of the asic and seeing what the resistance is then between the pin and gnd and the now unoccupied trace n gnd just to confirm.. but i recon the asic is at fault here.

Okeydokey cheers @mdeverhart I took these readings.. Betweeen pin 27 and 28(5v) 469ohms Between pin 27 and gnd.. 452ohms Between pin 28(5v) and gnd.. 15 ohms I was thinking along the same lines but wouldnt know what value resistor to add. Ive checked around there and theres no pull up...

Ahh I see whats happening here... pin 27 on the sram is low.. the machine death chimes.. if i dab some iso between pin 27 and 28 (5v) it seems to pull it up and it goes up to around 3.5v and then the machine works just fine.. Ive fitted a new sram ic and its made no difference.

One button is all ya need

That's gorgeous.. I love my 8100/110 but this is on another level of cool 😎

Looking sane as usual 😁

A couple around the serial asic.. looked fine but the via was not doing its job due to battery spill rot. Thanks.. That's what I love about this forum.. ☺some great folks on here.

Ive narowed it down to UD16.. it boots and works fine if i put iso on and around UD16.. weird. Otherwise it just does bad chime and no video. Its not the cooling effect cos I tried freezer spray and no joy. UD16 is the SRAM connected to the serial asic.

OMG..😃

In other news ☺ Still something wrong but omg now it boots to the desktop if I apply a layer of iso thanks to a couple of bad traces I fixed.

Great idea.. I might try the diagnostics mode if I can do it mac to mac.

Oh and it did this once.. when i mashed the nmi button.

Replaced both SRAM ics ☺ oh and gave it a bath in iso..

Yay

Progress ☺ happy mac.. then starts to boot and stops.. mouse kb and nmi still work. Only boots at all if i drench the board in iso.. otherwise its sad chime and no video. more investigation needed. But so pleased its getting past the grey screen now.

Whats a/ux like on a IIci.. speedwise? I'm thinking of giving it a go?

Random mac of the day.. IIci

@Phipli neat idea.. the boards coming out for a tantalum recap soon so will do that too.. cheers.