I have the following readings on ext ps2 connector:
5 - clock (goes to pins 4 & 11 H4066 - 2y 4y) 0.27V
3 - gnd
1 - data (to pins 2 & 9 - 1z +3 z) 5V
2 - should be nc but has 5V to pin 8 (3y)
4 - to pin 14 +V (Vcc)
6 - nc but 0.09V to pin 10 (4z)

I made amistake, 2 and 6 are used as ext mouse/kbd signals.

Internal and extaernal have separate paths. Didn't know.

5 - clock (goes to pins 4 & 11 H4066 - 2y 4y) 0.27V
3 - gnd
1 - data (to pins 2 & 9 - 1z +3 z) 5V
2 - should be nc but has 5V to pin 8 (3y) // is ext keyb data
4 - to pin 14 +V (Vcc)
6 - nc but 0.09V to pin 10 (4z) // is ext keyb clk

I'm desoldering the bios chip and reflash it.
Maybe it's a corrupt data.

I checked everything, but no broken traces, no evident damage; blown components.
Unless I get the same model again I can't figure this out.

Have no idea what keyboard pinout means.

looks like pinout for keyboard matrix

>internal keyboard connects to ALPS chip, (toshiba is keyb controller) and connects to T9934 too.

cd4066 is switching between internal/external keyboard. I dont know how would they detect ext keyboard is plugged, does your PS2 connector have any extra pins?
hmm now that I think about it maybe it starts in external mode, tests if keyboard is present and if not switches back to internal. After all PS2 was never hot swappable.

trace which 4066 pins 1 2 3 4 8 9 10 11 connect to toshiba, desolder 4066, hardwire ps2 data clock to those pins on toshiba - this will let you know if the rest of the chain is ok.

You're lucky, I had a board available to scan and picture. I'm not taking the 400CDT apart again for a while - so many screws!

These are the small versions, you can get the big versions on Imgur: https://imgur.com/a/aEYpvxT

Oh also, I recommend not ever removing that gold heatsink thing if possible, the processor inside is somewhat delicate.

rasz_pl wrote on 2022-10-24, 03:57:

looks like pinout for keyboard matrix […]
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looks like pinout for keyboard matrix

>internal keyboard connects to ALPS chip, (toshiba is keyb controller) and connects to T9934 too.

cd4066 is switching between internal/external keyboard. I dont know how would they detect ext keyboard is plugged, does your PS2 connector have any extra pins?
hmm now that I think about it maybe it starts in external mode, tests if keyboard is present and if not switches back to internal. After all PS2 was never hot swappable.

trace which 4066 pins 1 2 3 4 8 9 10 11 connect to toshiba, desolder 4066, hardwire ps2 data clock to those pins on toshiba - this will let you know if the rest of the chain is ok.

Ok, I'll see what it'll give.

rasz_pl wrote on 2022-10-24, 03:57:

looks like pinout for keyboard matrix […]
Show full quote

looks like pinout for keyboard matrix

>internal keyboard connects to ALPS chip, (toshiba is keyb controller) and connects to T9934 too.

cd4066 is switching between internal/external keyboard. I dont know how would they detect ext keyboard is plugged, does your PS2 connector have any extra pins?
hmm now that I think about it maybe it starts in external mode, tests if keyboard is present and if not switches back to internal. After all PS2 was never hot swappable.

trace which 4066 pins 1 2 3 4 8 9 10 11 connect to toshiba, desolder 4066, hardwire ps2 data clock to those pins on toshiba - this will let you know if the rest of the chain is ok.

I tried to trace pins from 4066 to Toshiba ic, but none has a connection to it.
Only the one adjacent (another 4066) does lead to Toshiba.

Is it that the 4066 close to the Ps2 connector could be busted? (it's the one closest to the cap, IC30 -or 38)

there might be other chips between, maybe they route it thru both 4066?

rasz_pl wrote on 2022-10-30, 06:20:

there might be other chips between, maybe they route it thru both 4066?

I tried desoldering the 4066 but it didn't change.
It's impossible to follow traces as at some point they end in a hole and I can't find where they go on the other side.

Probably a dead smd I can't see because it died without any pyro effect. 🙁

make a brush from copper soldering braid and sweep until multimeter beeps
https://www.youtube.com/watch?v=ehyfmMw29NU

rasz_pl wrote on 2022-10-31, 20:25:

make a brush from copper soldering braid and sweep until multimeter beeps
https://www.youtube.com/watch?v=ehyfmMw29NU

You got me good with this one! 😀
I was like wtf 🤣

Next thing on the list. Thanks again!!

Does anyone have a BIOS image for this board?
I'm willing to test many.
I had version 6.0 or 6.1 IIRC.

Thanks for any contribution.
I guess some smd blew somewhere and a connection is interrupted, but it so frustrating that I'll try finding that at another time.
Desoldering the bios chip, socketing it and try a new version is way faster and makes me feel I actually accomplished something.

Now I understand Adrian Black when he boxes stuff to repair at a later time 😀
Also the other thousands of retro collectors 🤣

I tried flshing version 6.3, but wouldn't POST.
Reflashing old bios and posts.

Does anyone have a dump of ver 6.3 that I could flash???

Pics of the damage of the boardaof the 200 CDT I bought.

Probably can be saved but damage is huge and extensive.

Any idea how to remove the green stuff from the board? I used some vinegar for battery damage but I think water got in.

rasz_pl wrote on 2022-10-31, 20:25:

make a brush from copper soldering braid and sweep until multimeter beeps
https://www.youtube.com/watch?v=ehyfmMw29NU

I finally found this kind of cable.

I was thinking that PS/2 must go to a "buffer", then to some "component for command interpretation" and "forward it to video card for -print- on screen".
Maybe more buffers.

I have no idea how PS/2 works but it can't be too different from ISA slot (buffer, some caps for signal stability, signal to chipset and then screen).

Pretty basic and possibly wrong thought. At this point I need to understand how keyboard signal goes to chipset.

Long repair job but I'll get there eventually... it can't be impossible.

It's been a while, but I've just given up on trying to repair some battery damage on a 110CT that it turns out had eaten ~5 legs of the CPU, debris from which has gone under the CPU. I'd need to remove the CPU to clean it up and since I've already had to replace several corroded pads that lifted off the PCB for the nearby keyboard connector I'm pretty I don't have the skills or time to remove, repair and replace the CPU without causing hours of damage.

Anyway, before I found to CPU problems I'd already removed the 187HP chip to clean up battery damage there. Checking to PCB I found pad 1-16 (the left hand side) had nearly half that had micro fractures between the pad and trace (probably the sort of thing teardrops help stop) so, particularly for the ones with vias under the chip, I wanted to know where they went so if needed I could run a bodge wire once I put the chip back down. It's not complete, but it might help check for continuity on your board.

1 1 - pin 2 of RM42 (near back panel external connector)
2 2 - pin 3 of RM42
3 3 - pin 4 of RM42
4 4 - pin 159 of IC2 TC203G14JF (reverse side from 187HP)
5 5 - second via in horizontal line of 4 to left of pin 17
6 6 - top of 3 vias in vertical line above pin 32
7 7 - pin 3 of RM36 (near external connector)
8 8 - NC?
9 9 - middle of 3 vias above pin 32
1010 - via under 187HP - don't know after that
1111 - via under 187HP - don't know after that
1212&13 - vias in silkscreen of Q209, just under IC19.
13      - look to be involved in external keyboard/mouse port
1414 - via under 187HP - don't know after that
1515 - bottom of 3 vias above pin 32
1616 - pin 1 IC21 (just under 187HP)
17
18 (all following to keyboard connector PJ13)
1938 - pin 11 (through 1k resistor, pulled high by 47k)
2039 - pin 10
2140 - pin 17
2241 - pin 16
2342 - pin 15
2443 - pin 14
2544 - pin 13
2645 - pin 12
2746 - pin 9
2847 - pin 18
2948 - pin 19
30
3149 - pin 7 (via clamp diodes D46-D49)
3250 - pin 1
3351 - pin 3
3452 - pin 8
3553 - pin 6
3654 - pin 2
3755 - pin 5
3856 - pin 4
39
40pins 20-25 of the keyboard connector go to the ALPS J V2.2 chip.
41some 0 ohm jumpers are used to connect pin 20 to 23 and pin 22 to 25
42pin 20/23 goes to pin 7 ALPS
43pin 22/25 goes to pin 4 ALPS
44pin 21 is GND
45pin 24 is power

Sorry to write so l8te , Do you still need a Floppy? (internal maybe?) I cam even check for a KB (but controller is on motherboard I don't think it will help much).

BTW , I think I have a service CD for thise old Toshiba Laptops , I downloaded the entire cd. (service cd of how to repair or what items are what). I will serch for the name and get back to you.

L.E. you remove green stuff with italian contact cleaner DUECI Electronic G-20 (dry) Puliscicontatti Secco & R-11 Simple Puliscicontatti

I also need to buy a bax of thise claners , I used up my 4x cans.

BTW you'r missing some SMD's on last set of pictures : 288 (almost fallen) D51 , even missing contact plates , PJ2 ,G20(that's a 3 point resistor or something) , R2x(above 288) & left to the traces 2 more black empty spaces with no smd and contact plates... (that's just from one image I checked).

Quite some movement today! 😀

@snufkin: everything is welcome, this project is love and frustration! Mostly love though 😉

@ediflorianUS: the pictures are of a busted laptop, not mine, that I'm using for spares. It's all crusty and even some pins of the chipset ICs are rotten and gone... I just need the courage to get back to it - 🤣
Yes, I think I have the same manual, unless by "service CD" you mean the schematics: that would be awesome x10²⁵.

Now I feel compelled to restart repairs 😀

Nexxen wrote on 2023-07-05, 11:42:

Quite some movement today! :) […]
Show full quote

Quite some movement today! 😀

@snufkin: everything is welcome, this project is love and frustration! Mostly love though 😉

@ediflorianUS: the pictures are of a busted laptop, not mine, that I'm using for spares. It's all crusty and even some pins of the chipset ICs are rotten and gone... I just need the courage to get back to it - 🤣
Yes, I think I have the same manual, unless by "service CD" you mean the schematics: that would be awesome x10²⁵.

Now I feel compelled to restart repairs 😀

just wait till I check at least the name of the cd.... and see what toshiba's lurking in my collection.

ediflorianUS wrote on 2023-07-06, 07:27:

Nexxen wrote on 2023-07-05, 11:42:

Quite some movement today! :) […]
Show full quote

Quite some movement today! 😀

@snufkin: everything is welcome, this project is love and frustration! Mostly love though 😉

@ediflorianUS: the pictures are of a busted laptop, not mine, that I'm using for spares. It's all crusty and even some pins of the chipset ICs are rotten and gone... I just need the courage to get back to it - 🤣
Yes, I think I have the same manual, unless by "service CD" you mean the schematics: that would be awesome x10²⁵.

Now I feel compelled to restart repairs 😀

just wait till I check at least the name of the cd.... and see what toshiba's lurking in my collection.

Thanks mate!
One thing I couldn't figure out (among many) is the connector model of the FDD connector. I could buy a new one and make a cable.
My old project is to have a normal FDD as an ext drive.
Well, I'm not fretting over anything, take all your time.