Toshiba T5200 mods and upgrades

Discussion about old PC hardware.

Re: Toshiba T5200 mods and upgrades

Postby Vipersan » 2018-7-31 @ 12:57

It's great to see there is recent activity on this thread which Ian started ..but I can't help wishing Ian himself visited and commented ..
I'd hate to think this thread was just a legacy..
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Re: Toshiba T5200 mods and upgrades

Postby Hamby » 2018-7-31 @ 22:23

I keep hoping he'll come back, both because I enjoyed his presence but also to get yet more advice lol.

I need to replace the barrel battery on my new 286 MB. But I don't know what I can safely replace it with.

More on-topic, I need more advice on my T5200's CMOS battery issue, before I go trying to randomly replace caps...

Hey, maybe my jury-rigged cpu fan is draining the cmos battery?
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Re: Toshiba T5200 mods and upgrades

Postby Vipersan » 2018-8-01 @ 10:19

Unless you have the fan directly tied accross the Cmos battery ..
Most unlikely ..lol
I do hope you sort this Hamby ..but I can only suggest the current monitoring method ..
a meter in milliamps range in series with the + line of the battery ..
Pull the bios chip ..and see if any current is still flowing ..
If no ..then I guess only the chip is potentially draining the battery ..
If yes ...the hunt is on ..
Disconnect or remove other components./suspects ...until no current flows ..
then apprehend the suspect..
rgds
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Re: Toshiba T5200 mods and upgrades

Postby Hamby » 2018-8-08 @ 17:59

I've been following another message thread about someone whose cmos battery dies after 1-2 weeks.
One suggestion was bad bios chip... I don't have the wherewithal to burn a new one, or even figure out what's wrong with the old one, if it's the bios raping the cmos battery :(
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Re: Toshiba T5200 mods and upgrades

Postby Jinxter » 2018-8-09 @ 13:32

Vipersan wrote:Been busy today making an escutcheon to fit the T3200SX ..carry the lcd screen and hide the fact that it is a little bit smaller than the original Plasma screen.

How did this end? I haven't seen any picture of the completed machine.
I am especially interested in how you fitted the board that came with the LCD.
I have an T3200SX with a cracked screen, so i am contemplating doing the same.
Check out my YouTube channel: Retro Erik https://www.youtube.com/channel/UCSUf7nCpwTgFbjGmcTYGZEQ
My collection: https://retro.hageseter.com
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Re: Toshiba T5200 mods and upgrades

Postby Vipersan » 2018-8-11 @ 12:42

Hi Jinxster ...
It ended very well indeed ..
You need to read my 3200 thread for more info ..
viewtopic.php?f=46&t=60109&p=675157&hilit=T3200#p675157
rgds
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Re: Toshiba T5200 mods and upgrades

Postby LeFlash » 2018-8-14 @ 08:46

I recently got my hands on one of the very rare T5200 with color lcd. Although it's that rare, it was not really usable in todays perspective so i changed the panel to a modern LED-backlight TTL one.
2 problems still remain:

1) Output to the panel is 4bit, so i can only get the first 16 colors.
2) original panel has 640x400 and mine has 640x480 - so the 2 topmost lines repeat at the bottom.

Maybe i can get around this with a FPGA and directly interfacing the ramdac on the paradise card
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Re: Toshiba T5200 mods and upgrades

Postby Vipersan » 2018-8-14 @ 11:26

Agreed ..this is indeed a rare item ..
If it is not too much hassle ...pics of the machine and any mods you make would be most appreciated.
rgds
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Re: Toshiba T5200 mods and upgrades

Postby Auzner » 2018-8-22 @ 21:50

I have a cheap as-is T3100SX. Clock Ni-Cd leaked all over the PSU. Going to jerry rig some supplies just to see what functions.
Anything special about the IO pins on the power connector? Or will 5V, 12V, gnd do?
Can someone direct me to more info on the description of these signals?
pj9.PNG


VCC - Mouser says that CPU model number is 5V.
RAMV - 53C104 appears to be 5V chips.
N9V - -9V for RS232 or IO
DSP - display, PDP is 12V
DI/DL might be the left and right led boards
DCLED might be 3.3/5 for the LED power
BRCNTM Brightness control?

Ah, found another page that helped.

power.PNG


Update:

I've got some green lights, but forgot to wire a power button!

t3100sx_psu_rig.jpg
Last edited by Auzner on 2018-8-23 @ 06:33, edited 1 time in total.
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Re: Toshiba T5200 mods and upgrades

Postby Auzner » 2018-8-23 @ 06:31

I tried grounding pin 20 from FLAPO4 PJ5-20 and nothing changed. So I'm tracing the power button through the original power supply.

PCB FLAPS5:
Power switch S1 goes to R9
R9 goes to IC1-39
IC1-40 goes to R10
R10 to R13
R13 to PJ1-47
PJ1-47 to PJ4-47 on FLAPO4

PCB FLAPO4:
PJ4-47 to PJ5-20
PJ5-20 to motherboard

Figuring out what K00 and K01 are up to on PCB FLAPS5 IC1, which is a 4-bit microcontroller tmp47c860f. I would have expected pin 40 to be an output, not input. I'm in trouble going through this microcontroller.
What is PSSD, PSRD, INTDSP, PCLR, INITSW, DCVMC? Is there more than just a pull down, but a digital signal that has to be sent to the main board?

t3100sx_pwr_btn_trace.jpg


t3100sx_psu_mc.jpg


edit:
some place to put bios dump of AM27C1024
md5 531c2e5c8365afb0319e21f1bea4ce85 t3100sx.bin
sha1 9a949985c2ec526c35a13940a2bdc3d002045112 t3100sx.bin
Attachments
t3100sx.gz.tar
(52.49 KiB) Downloaded 1 time
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Re: Toshiba T5200 mods and upgrades

Postby IanB » 2018-10-03 @ 21:11

Vipersan wrote:It's great to see there is recent activity on this thread which Ian started ..but I can't help wishing Ian himself visited and commented ..
I'd hate to think this thread was just a legacy..

Hamby wrote:I keep hoping he'll come back, both because I enjoyed his presence but also to get yet more advice lol.

I am still here, I've been dealing with family matters so haven't had any time for hobby stuff.
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Re: Toshiba T5200 mods and upgrades

Postby Hamby » 2018-10-03 @ 21:21

IanB wrote:
Vipersan wrote:It's great to see there is recent activity on this thread which Ian started ..but I can't help wishing Ian himself visited and commented ..
I'd hate to think this thread was just a legacy..

Hamby wrote:I keep hoping he'll come back, both because I enjoyed his presence but also to get yet more advice lol.

I am still here, I've been dealing with family matters so haven't had any time for hobby stuff.



Cool, I can understand that.

Hey, Ian, I found out Amazon has the same Toshiba Lithium batteries that I pulled from my T5200, but I don't think it has the resistor (?) the CMOS battery had. I was thinking of getting one, since it's 3.6v vs the 2032's 3.0v, but don't know what the function of the resistor might be...
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Re: Toshiba T5200 mods and upgrades

Postby IanB » 2018-10-03 @ 22:26

Hamby wrote:Hey, Ian, I found out Amazon has the same Toshiba Lithium batteries that I pulled from my T5200, but I don't think it has the resistor (?) the CMOS battery had. I was thinking of getting one, since it's 3.6v vs the 2032's 3.0v, but don't know what the function of the resistor might be...

It's to limit current draw from the battery and also to limit any reverse leakage current from the motherboard that might damage the battery by trying to charge it.

Have you tried measuring the resistance of the motherboard battery header?
i.e. remove the battery connector, set a multimeter to resistance mode and connect it to the + and - pins of ther battery header.
On mine this shows a low resistance initially, climbing to several megaohms after a few seconds. This is due to a capacitor charging and after it has charged you get the high resistance. If you get a low resistance all the time then that might indicate the capacitor is leaky.
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Re: Toshiba T5200 mods and upgrades

Postby OldCat » 2018-10-04 @ 07:19

IanB wrote:I am still here, I've been dealing with family matters so haven't had any time for hobby stuff.


Relieved to hear that, Ian. Hope the storms calm down in your life. All the best from fellow Vogoners.
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Re: Toshiba T5200 mods and upgrades

Postby Vipersan » 2018-10-04 @ 11:21

Welcome Home buddy..
not the same here without you.
and thanks for the PM update.
yes I was worried as we all were..
;)
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Re: Toshiba T5200 mods and upgrades

Postby raindog » 2018-11-04 @ 18:07

Apologies for the cross-post but just in case an expert is just looking at this thread, can anyone help with "Toshiba t5200 screen display stops after a few seconds"
https://www.vogons.org/viewtopic.php?f=46&t=63431#p711059 ?

thanks
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