PD2JK wrote on 2022-11-20, 17:03:

The diodes are all fine. (Yes I thought they were FETs, when it said Dxxx on the silk screen, doh!)

I gave up and bought a 460CDT with a broken keyboard and missing HDD. The keyboard from the 220 should fit...

Hopefully someone will kick this thread with a solution in the future and solve this mystery.

Without schematics I doubt. I've been on my 200 for a year now and after trying it all I'm left with using a thermal camera to spot anything.
Many components I suspect are simply impossible to find. Even if I can find the issue if it is those I'm done.

Old stuff, what can you do?

Nexxen wrote on 2022-11-20, 17:26:

Old stuff, what can you do?

True. 😀 Ah well, it keeps you off the streets...

PD2JK wrote on 2022-11-20, 18:14:

Nexxen wrote on 2022-11-20, 17:26:

Old stuff, what can you do?

True. 😀 Ah well, it keeps you off the streets...

Where I live it's already the best option to stay home and nerd. 😀

Good luck finding a new one!

PD2JK wrote on 2022-11-20, 17:03:

The diodes are all fine. (Yes I thought they were FETs, when it said Dxxx on the silk screen, doh!)

I gave up and bought a 460CDT with a broken keyboard and missing HDD. The keyboard from the 220 should fit...

Hopefully someone will kick this thread with a solution in the future and solve this mystery.

Hey it's the future now, it's some test pads connecting the memory traces on the underside of the board in the location where the RTC and Standby NiMH batteries plug in. The symptom is the laptop turns 'on' but doesn't do anything, the hard drive does not spin up and the screen does not turn on.

If you hook up a parallel port POST code reader, it should display codes "04" or "05" which mean it gets stuck on Ram initialisation or SM-RAM check. If it doesn't display those codes then there's a different fault and this fix will not apply.

But if it does then see this thread: Re: Help with diagnosing an old Toshiba laptop - repairing a Satellite 480CDT
and this thread: Toshiba 460CDT - POST/Flash codes? - repairing a Satellite 460CDT / 460CDX
The soldering is pretty fine work if you're directly jumpering the damaged traces, but I've been thinking about it and this could probably be achieved by soldering wires from the RAM pads up to the bunch of resistors to fix the memory signals. I'm hoping that someone other than me can try out this fix to see if it gets their board working since more and more Satellite 220 / 230 / 440 / 460 / 470 / 480 laptops are showing up for sale in this non-working state.