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Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
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analogRF:
I am worried that maybe because of the bulging leaky dead caps when the instrument first powered on (after several month of inactivity)
maybe one of the devices/chips on the board could not tolerate the surge or ripple of whatever and died...i don't think it is the cpu and i am sure it was not he memory stick but other chips...just a bad thought  :scared:
nctnico:
If any of the electrolyte got spilled on the board then it may create a short(ish) or have eaten away a trace. IMHO you are probably better of by installing a new motherboard as Converter has suggested. You have already tried every 'simple' solution.
Alfons:
If the BIOS is set to default, the device boots in any case. After the Cmos battery was empty on my board, the bios was also on default settings. I just had to set the time. The fact, that the device did not boot is not due to the bios settings, but probably because the IDE controller has a defect (if the hard disk is OK).
analogRF:

--- Quote from: nctnico on November 27, 2019, 06:43:09 pm ---If any of the electrolytic got spilled on the board then it may create a short(ish) or have eaten away a trace. IMHO you are probably better of by installing a new motherboard as Converter has suggested. You have already tried every 'simple' solution.

--- End quote ---

luckily there was no spillage on the board at all, the caps had leaked from the top of their head  :o

yeah I am looking at those baby AT boards, the thing is that he does not want anything changed at the back of the scope
so all the cards must sit in the same positions as they are now. By looking at the pictures of these boards I cannot
say which one would allow this


EDIT: stil pictures of the bios settings is appreciated
charlyd:
does the board ramdomly reboot?    i mean if you pull all cards and power on the mainboard does it post or even then reboot?  you can try with a seperate PSU
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