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Set environment command:

Thank you Frankl, I did some experiments with a known good 2.7 logic board. The 2.0 GHz processors does work on 2.7 logic, unfortunately only one was good but the Mac needs both processors in place to power on. So I booted into open firmware and luckily I managed, before the system eventually...

yes, I am well aware of the thermal calibration having performed it several times. I have ASD for 2003, 2004 and 2005 PM G5. This time I would try to make one working G5 out of a bunch of dual 2.7 carcasses but without knowing if its the logic board or the processor that are busted I am groping...

I have some known good early 2005 logic board but short of 2.7 GHz liquid cooled processors (I believe they are all gone by now). Is the swap of 2.0 processors feasible?

Removed everything, CD, ZIP, replaced CD drive, removed all Ram sticks except one, moved the video card to the farthest slot, installed a new HD: bingo! Don’t ask me what was the cause! I went the straight way:

Removed HD and ZIP, and all PCI cards, put back the G3 processor: no way. It boots fine with OS X Tiger but not with any Mac OS Classic. I even installed an universal Mac OS 9.2.2 from another Mac to an IDE HD and put as the only device in the G3: doesn’t boot.

I flashed this G3 B&W and installed a G4 processor, adjusted the jumpers for the new bus/frequency combination and now it runs OS X 10.4 decently, but I cannot get to install any classic Mac OS. Should I go back to G3 for this?

Any idea on how to seal the thing as a preservation measure?

Some have the fuse soldered, this one removable. I removed the fuse for the dishwasher step.

I replaced the logic board from a spare one (not sure if it is ok, though): not it chimes but then noting. 

Ok, its the right pad. BTW regarding the mosfet how come that in each and every logic board that I am testing they all seem shorted? 

Btw, those three mosfet are weird. I tested by removing them from the logic board (more than one logic) and they seem all shorted, i.e. the gates (G) are not discharged after touching with the finger.

I am about to recap this logic board but the capacitor at C104 has a lifted pad and one mosfet (is it a mosfet) is missing. Two questions: 1) where can I get to continuity to the missing pad? 2) Cannot get to find this NEC J143 mosfet.

How come? I decided to service the LCS of a working G5. I removed the processors from the LCS and left the thing for several months. Yesterday when I finally completed the LCS refill and hoses and o-rings replacement and reassembled everything: nada, no boot, no led, no noting. PSU is fine...

Its a 13 years old thread...

I recall tampering with 190/cs/5300/c/ce and provided the right bezels and the right inverter are used any combination is possible. 

Another one liberated! This one has the purple rot though:

Its permanent. I took apart one LCD that had both: the vinegar syndrome and the rot. The pink stuff is in. between the two layers of glass.

I am definitively sorting our sone busted stuff: 1) vinegar syndrome and liquid crystals leakage (vinegar syndrome could be fixed by replacing the polarized film, but this specific LCD had also the purple spiderweb called LCD rot: after taking apart the whole LCD and removal of plastic...

Indeed its easier than expected, its the polarized film. Piece of case is the removal. I have just ordered for 20 euros a 20x20 polarized film.