Products > Test Equipment
Agilent 54835A scope (4 channel 1GHz / 4Gs/s) repair & uphack
analogRF:
any ideas?
nctnico, I am counting on you ;)
nctnico:
--- Quote from: analogRF on November 25, 2019, 12:37:00 pm ---any ideas?
nctnico, I am counting on you ;)
--- End quote ---
It beats me. I'd try to take all the cards from the motherboard and use a standard PCI videocard to see if the problem is in there. Perhaps try to connect a speaker to the motherboard and check for beeps. There are also diagnostic cards which you can plug into a slot but I never used these.
One thing you could do is take the battery from the motherboard, short the battery terminals to make sure the CMOS memory is powered down fully. There may be a jumper on the motherboard for this purpose.
analogRF:
i dont have a video card but I just took the CF card and adapter that I had put in my own unit (and of course it is working) into this unit
to replace its hard drive. NO change :palm: the BIOS recognizes the CF card and reports its size and everything though
Actually that little CF card IDE adapter has a data LED on it that flashes when there is access to the CF card and it flashes when bios is detecting the IDE devices. However I noticed that after that "Verifying DMI pool data..." when the win98 should start, there is no access to the CF card at all
unless it flashes for like a few micro seconds that I cannot see but I don't think so, it appears that it never tries to access it really. It seems the BIOS gets lost at that point...is it possible that the BIOS chip is gone bad somehow after sitting idly by for a few month? :-//
2N3055:
Remove battery and try booting (without it). On some old PC motherboards empty battery would prevent boot. It would behave exactly like that.
Of course, there is a chance of corrupted BIOS...
analogRF:
battery is brand new...i have reset CMOS 100 times even shorting the battery holder pins
but the unit had been working until few month ago and after that it was sitting in the corner of his workshop (I had seen it in his workshop myself when it was working and also when it was put aside) how the bios could get corrupted? and exactly at that point when it is supposed to load the OS. everything before that takes place as it should
By the way, I notice that in the device table, it shows an unknown device (which I suppose is the interface board) and its IRQ is NA? everything else has a name and proper IRQ number. Is that normal?
EDIT: my mistake, the interface board has IRQ=10 and the display board has no IRQ number and that is exactly how it is on my own working unit. Still stuck at Verifying DMI pool data....I am out of ideas pretty much except maybe programming the BIOS chip?! :-// but why? and with what BIOS file? the one in the chip does not seem to exist anywhere on internet...
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