Any update for this?
When all the caps are desoldered, clean the board off with isopropyl alcohol to remove any electrolytic fluid that may have leaked from failing capacitors.
Thanks for asking, DankEngihn!
I got back home today and wanted to check this again.
I found five fuses, that were all ok. Which is kind of bummer, it would have been
easier fix (but of course, if fuses were busted, something else probably would have been too...).
I pulled suitable caps from old atx psu. Replaced the 1000uF cap and the two blue 220uF caps
from used spares, since I got no new ones to try with. I then tried to boot, but the DC IN led blinking
was the same as before.
I measured RTC battery, it was now 2,91V when no charging and 3,25V while charging.
The power button has 4,77V on one leg (when pressed down zero volts). I believe power button
is working as it should.
I got up 3am today and drove some 200 miles to my working town. It's now about 8pm
here and I think I need to continue this tomorrow. Fighting against fatigue while trying to fix
things might just make me mess things up more.
edit:
granted, that I may well have done some damage to the unit myself by trying it without these caps.
But I've been thinking about others who have fixed t1900c laptop with faulty capacitor(s).
They reported, that the machine actually turned on for second or two, and then immediately shut down.
This unit is just dead - apart from the DC IN led blinking.
This has made me think, that there may also be something else wrong with the unit and not the caps after all.
CPU ? rams ? I guess a number of things could go bad and make the unit just have black screen.