TrashPanda wrote on 2022-01-29, 16:01:

Nexxen wrote on 2022-01-29, 14:52:

I have an issue with the PS2 connector. Post halts at KBC error. […]
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I have an issue with the PS2 connector.
Post halts at KBC error.

Appeared after I used an external keyboard to avoid errors with problematic keys on the stock keyboard.
Prior signs of repair are there.

A couple of R22 read 0.09 and 0.14 instead of 0.22 ohm

Sounds like its cracked the solder joints on the keyboard connector, these laptops will halt if that connector is damaged. This happened recently to another user and once they repaired the connector the machine worked as normal, pretty sure Toshiba routed the internal keyboard through that connector, if it breaks it stops both keyboards from being detected.

I'll redo the job as I'm on it.
I'll report in 15 mins

TrashPanda wrote on 2022-01-29, 16:01:

Nexxen wrote on 2022-01-29, 14:52:

I have an issue with the PS2 connector. Post halts at KBC error. […]
Show full quote

I have an issue with the PS2 connector.
Post halts at KBC error.

Appeared after I used an external keyboard to avoid errors with problematic keys on the stock keyboard.
Prior signs of repair are there.

A couple of R22 read 0.09 and 0.14 instead of 0.22 ohm

Sounds like its cracked the solder joints on the keyboard connector, these laptops will halt if that connector is damaged. This happened recently to another user and once they repaired the connector the machine worked as normal, pretty sure Toshiba routed the internal keyboard through that connector, if it breaks it stops both keyboards from being detected.

Nothing changed.
It should work even without a keyb attached?

I redid solder joints on ps2, keyb rom and flat cable.
kbc error still.

Removed ps2 connector and kbc error.
Probably the keyb rom failed.

Could it be a failed BIOS chip?

I mean corrupt.

Updte: no, still KBC error after using a different chip

When I plug the ext keyb, leds light for a moment and then nothing.
KBC error

At this point if anyone has any clue or stuff to check please post.

pics

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

Can't find datasheets of these 3.

pics

The good thing is that I just need the motherboard with the PSU to make tests.
😀

Next I'll try to desolder, flash and add a socket to the bios chip.

Bump

What I'm looking for: datasheets for these 3 chips,

1) ALPS-J v2.2
2) Toshiba 187HP C1995 226 641KOJ (could be K (zero) J and not another O letter)
3) T9934
4) HC 4066 (HC4066 / (TI logo) 66C /Zt04)

Does anyone know if this is a BIOS issue? Reflashing could solve this error?
>Up: no, doesn't
IF I get this error it means that the bios is actually working and it's useless to reflash?
>Up: yes

If I get a KBC error, and all the keyboards are disconnected, this should be pointing to the keyboard controller?
In the past (when it wasn't halting at that error) I disconnected the internal keyboard and it would boot fine, no errors. I simply could not use the keyboard.

The T9934 might be CMOS settings storage:

A Real Time Clock (RTC) One T9934 chip is used. The T9934 has 128 ofbytes memory. Fourteen bytes of memory are used for the cale […]
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A Real Time Clock (RTC)
One T9934 chip is used. The T9934 has 128 ofbytes memory. Fourteen bytes of
memory are used for the calendar and clock. The remaining 114 bytes are used for the
system configuration data.
OSC (X3) generates 32.768 KHz for RTC.

(from here: http://minuszerodegrees.net/manuals/Toshiba/O … %20Addendum.pdf )

[I've been on and off looking at a Toshiba 110CT, which has the same 187HP and ALPS J V2.2 chip. Battery leaks were much worse in mine and had cut tracks where traces opened up to the solder pads for the flat keyboard connector, along with traces on the flat cable. I think the flat cable has 19 traces for the keyboard (maybe a 10*9 diode matrix for the 84 keys) and then 6 traces for the pointer going to the Alps chip. The pointer traces are on an orange part of the cable which is ok to work on. The keyboard traces are grey coloured and vanish if a soldering iron is waved in their direction. Haven't yet tried powering it up, so can't really help with your KBC error.]

Nexxen wrote on 2022-02-01, 11:10:

What I'm looking for: datasheets for these 3 chips,
(...)
4) HC 4066 (HC4066 / (TI logo) 66C /Zt04)

That's probably a 74HC4066, a somewhat newer and maybe faster (not that it matters) variant of good old 4066 quad MOSFET switch. Look for CD4066B from TI, same thing just older tech.

snufkin wrote on 2022-02-02, 14:52:

The T9934 might be CMOS settings storage: […]
Show full quote

The T9934 might be CMOS settings storage:

A Real Time Clock (RTC) One T9934 chip is used. The T9934 has 128 ofbytes memory. Fourteen bytes of memory are used for the cale […]
Show full quote

A Real Time Clock (RTC)
One T9934 chip is used. The T9934 has 128 ofbytes memory. Fourteen bytes of
memory are used for the calendar and clock. The remaining 114 bytes are used for the
system configuration data.
OSC (X3) generates 32.768 KHz for RTC.

(from here: http://minuszerodegrees.net/manuals/Toshiba/O … %20Addendum.pdf )

[I've been on and off looking at a Toshiba 110CT, which has the same 187HP and ALPS J V2.2 chip. Battery leaks were much worse in mine and had cut tracks where traces opened up to the solder pads for the flat keyboard connector, along with traces on the flat cable. I think the flat cable has 19 traces for the keyboard (maybe a 10*9 diode matrix for the 84 keys) and then 6 traces for the pointer going to the Alps chip. The pointer traces are on an orange part of the cable which is ok to work on. The keyboard traces are grey coloured and vanish if a soldering iron is waved in their direction. Haven't yet tried powering it up, so can't really help with your KBC error.]

Thanks! I'll try something this weekend.
I read the manual of the 200 model, and at post if you hold the spacebare down it can do some checks.
There is a LPT device with leds to tell the error (when it happens). Don't have it but it'll be useful, and maybe it's not that hard to build.

Deunan wrote on 2022-02-02, 15:07:

Nexxen wrote on 2022-02-01, 11:10:

What I'm looking for: datasheets for these 3 chips,
(...)
4) HC 4066 (HC4066 / (TI logo) 66C /Zt04)

That's probably a 74HC4066, a somewhat newer and maybe faster (not that it matters) variant of good old 4066 quad MOSFET switch. Look for CD4066B from TI, same thing just older tech.

Found, I'm going to check if there are shorts or other issues.

Hello i have an issue with the same laptop that you have
link: Toshiba Satellite 200CDS

Still can't figure out what's wrong with this machine.

Anyone any idea, experience? Driving me mad 😀

I just got a Toshiba Satellite 400CDT that was giving the "KBC ERROR" on boot up. Took the whole thing apart and the standby battery had leaked out of its heatshrink onto the "IC21" HC4044 chip by the keyboard controller, some of the legs had visible corrosion on them. I have a spare very dead board so I took an HC4044 off of that (there's a pair of them down by the PCMCIA slots)
After removing the old one and cleaning the pads, thankfully none of the traces came off and it cleaned up nicely. Here's what it looks like all cleaned up:

I think there are some traces relating to the external keyboard connector around PJ503 so that needs careful cleaning. Ideally by scraping off corroded solder then try to re-tin it. To aid in that, I removed the PJ503 standby battery header on mine, the corrosion was only top-side.

It took a while to clean up the corrosion on the "IC21" HC4044's pads as well as the part where the standby battery used to plug in, by the fan connector. There's also a little green via where there's some corrosion but hopefully the vinegar I put it will stop it degrading further.

Clean the Toshiba 187HP chip quite thoroughly, I took that off on my donor board and there was a little bit of battery corrosion under it, which maybe would've bridged some pins.

Hopefully that helps you get your one working. For reference also, the Toshiba 2130's maintenance manual gives a bit clearer explanation of what chip does what. The Toshiba 187HP chip is the keyboard's microcontroller - can't find any valid pinout for that. The Alps chip is the "IPS" or Internal Pointing Stick controller.

Thermalwrong wrote on 2022-10-23, 01:12:

I just got a Toshiba Satellite 400CDT that was giving the "KBC ERROR" on boot up. Took the whole thing apart and the standby bat […]
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I just got a Toshiba Satellite 400CDT that was giving the "KBC ERROR" on boot up. Took the whole thing apart and the standby battery had leaked out of its heatshrink onto the "IC21" HC4044 chip by the keyboard controller, some of the legs had visible corrosion on them. I have a spare very dead board so I took an HC4044 off of that (there's a pair of them down by the PCMCIA slots)
After removing the old one and cleaning the pads, thankfully none of the traces came off and it cleaned up nicely. Here's what it looks like all cleaned up:
400cdt-kbc-error-1.jpg
I think there are some traces relating to the external keyboard connector around PJ503 so that needs careful cleaning. Ideally by scraping off corroded solder then try to re-tin it. To aid in that, I removed the PJ503 standby battery header on mine, the corrosion was only top-side.

It took a while to clean up the corrosion on the "IC21" HC4044's pads as well as the part where the standby battery used to plug in, by the fan connector. There's also a little green via where there's some corrosion but hopefully the vinegar I put it will stop it degrading further.
400cdt-kbc-error-2.jpg

Clean the Toshiba 187HP chip quite thoroughly, I took that off on my donor board and there was a little bit of battery corrosion under it, which maybe would've bridged some pins.

Hopefully that helps you get your one working. For reference also, the Toshiba 2130's maintenance manual gives a bit clearer explanation of what chip does what. The Toshiba 187HP chip is the keyboard's microcontroller - can't find any valid pinout for that. The Alps chip is the "IPS" or Internal Pointing Stick controller.

I'll try that as mine had corrosion 😀
I don't know if I did catch it all when cleaning.

Thanks a lot. I'll give it a go this afternoon!!

Thermalwrong wrote on 2022-10-23, 01:12:

I just got a Toshiba Satellite 400CDT that was giving the "KBC ERROR" on boot up. Took the whole thing apart and the standby bat […]
Show full quote

I just got a Toshiba Satellite 400CDT that was giving the "KBC ERROR" on boot up. Took the whole thing apart and the standby battery had leaked out of its heatshrink onto the "IC21" HC4044 chip by the keyboard controller, some of the legs had visible corrosion on them. I have a spare very dead board so I took an HC4044 off of that (there's a pair of them down by the PCMCIA slots)
After removing the old one and cleaning the pads, thankfully none of the traces came off and it cleaned up nicely. Here's what it looks like all cleaned up:
400cdt-kbc-error-1.jpg
I think there are some traces relating to the external keyboard connector around PJ503 so that needs careful cleaning. Ideally by scraping off corroded solder then try to re-tin it. To aid in that, I removed the PJ503 standby battery header on mine, the corrosion was only top-side.

It took a while to clean up the corrosion on the "IC21" HC4044's pads as well as the part where the standby battery used to plug in, by the fan connector. There's also a little green via where there's some corrosion but hopefully the vinegar I put it will stop it degrading further.
400cdt-kbc-error-2.jpg

Clean the Toshiba 187HP chip quite thoroughly, I took that off on my donor board and there was a little bit of battery corrosion under it, which maybe would've bridged some pins.

Hopefully that helps you get your one working. For reference also, the Toshiba 2130's maintenance manual gives a bit clearer explanation of what chip does what. The Toshiba 187HP chip is the keyboard's microcontroller - can't find any valid pinout for that. The Alps chip is the "IPS" or Internal Pointing Stick controller.

Could you please send pics of the mobo in HQ, top and bottom (of the interested area).
I kinda think something may have got blown and or missing .

I'll stitch it back.
It's an annoying task, sorry for that.

https://pdf1.alldatasheet.com/datasheet-pdf/v … S/74HC4066.html

This chip goes to ext keyb, signals 3E and 4E have continuity to Gnd.
But they should be active high. This means there should be V+ and not gnd?