Toshiba T4900CT

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Toshiba T4900CT

Postby Arson » 2018-9-13 @ 02:43

This was my very first laptop and when i found one available on ebay, i snatched it up! However, because it lacked a power adapter, i cannot determine it's working condition!

I have browsed around the forums and have come up with several upgrades I would like to add upon it. Anyone have a source as to locating an AC adapter that will power it up? One i bought on ebay that -claimed- to be compatible was a bust.
Last edited by Arson on 2018-9-24 @ 23:21, edited 1 time in total.
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Re: Toshiba T4900CT

Postby Arson » 2018-9-13 @ 02:44

[img]jpg[/img]

Found specs for the original AC adapter.
Last edited by Arson on 2018-9-24 @ 20:18, edited 1 time in total.
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Re: Toshiba T4900CT

Postby henryVK » 2018-9-13 @ 11:30

There's two of those on Ebay. The model number is right there in the picture. Otherwise get one of those adjustable power adapters and make sure it comes with the right "tip".
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Re: Toshiba T4900CT

Postby Arson » 2018-9-14 @ 00:15

henryVK wrote:Otherwise get one of those adjustable power adapters and make sure it comes with the right "tip".


Can you recommend one for me?
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Re: Toshiba T4900CT

Postby Arson » 2018-9-14 @ 02:23

Update! I've gone ahead and removed the HD out of it to check what was on it. Windows 3.1! If the laptop is in perfect condition once I plug it in, I will be quite happy! Although, i still plan to swap out the HD and use a CF to IDE adapter with a CF card in it's place. I also need to locate a 32MB memory card to add to it.
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Re: Toshiba T4900CT

Postby Arson » 2018-9-14 @ 02:29

My plan is simple. Determine if it powers on with no issues. Replace floppy drive, add PC card CD-rom, SD card reader, and a network card. Despite it being too slow to browse the Internet in this era, I can still have some use of network transfering files to and from it.
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Re: Toshiba T4900CT

Postby Arson » 2018-9-14 @ 07:48

Well, i went ahead and bought https://smile.amazon.com/gp/product/B07GVDL637 this from amazon. If it does not burn out the laptop, I hope it'll work nicely.
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Re: Toshiba T4900CT

Postby Arson » 2018-9-18 @ 18:24

New power adapter works perfectly! Powered on and bios is the latest/final version, v5. Now i am going to explore the HD to determine whether the drive works!
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Re: Toshiba T4900CT

Postby Arson » 2018-9-18 @ 19:12

The cord is a little sensitive to touch as i have to wiggle it a few times in order for the laptop to detect it. I suspect it has to do with the power adapter, not the laptop itself. Now that it has powered on, i have determined that it has windows 98 installed and the floppy drive does not work. It won't complete windows load due to lack of system memory. So my next bit will be getting a CC type memory card for it.
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Re: Toshiba T4900CT

Postby Arson » 2018-9-18 @ 19:14

The battery condition is not certain but I have hopes that it still works? I also noticed a blunt area where the screen may have been damaged. Image goes through but it is obvious that it will need to be replaced.
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Re: Toshiba T4900CT

Postby Arson » 2018-9-19 @ 09:45

I keep having trouble with this power adapter. Either it's really wonky or the power connector on the board may have gone bad. Only way to determine that would be to get a second power adapter of a different variety and test it that way. If it truly is the connector, i may have to completely disassemble this laptop and unsolder the connector from the board and resolder a replacement connector. Hopefully this is not the case. Never soldered before.
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Re: Toshiba T4900CT

Postby Arson » 2018-9-20 @ 08:20

I have ordered a CC style memory card for the laptop but it's located in Israel so it's going to take a few weeks to get here. The toshiba power brick should be here sometime next week. Hoping that the issue will be with the adjustable power cord and not the laptop power port itself.
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Re: Toshiba T4900CT

Postby Arson » 2018-9-20 @ 20:13

Image

Unusual bubbling or heat damage. Picture goes through but it's obvious that the LCD screen should be replaced. Could I find that part for sale or maybe an earlier model that is compatible with the T4900CT?
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Re: Toshiba T4900CT

Postby Arson » 2018-9-24 @ 20:27

I have found an official power adapter that is for this model of laptop and based on this experience, i have determined that the AC adapter is fine. I suspect that the power issues is a result of the dead CMOS battery.

Image

Win98 will not run without the 32MB memory card addon as evidence in this photo.

Image
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Re: Toshiba T4900CT

Postby Arson » 2018-10-02 @ 01:35

The 32MB card has arrived. I have completely disassembled the laptop to gain access to replacing the CMOS battery as well as the floppy drive.
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Re: Toshiba T4900CT

Postby peido » 2018-10-03 @ 15:44

Hi.
That's a nice laptop. Hope you can completely restore it.

About the CMOS battery, Toshibas of that era usually have bad batteries (https://www.vogons.org/viewtopic.php?f=46&t=60613). I store my Toshibas without any batteries, to prevent further damage.

Arson wrote:Unusual bubbling or heat damage. Picture goes through but it's obvious that the LCD screen should be replaced. Could I find that part for sale or maybe an earlier model that is compatible with the T4900CT?

That's strange. Does the LCD heats up to an unusual temperature? Or do you think that the damage was made with an external heat source?
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Re: Toshiba T4900CT

Postby Arson » 2018-10-03 @ 15:57

peido wrote:Hi.
That's a nice lapt--


I suspect it was the result of an external source. But it still shows up just fine. As for the batteries, Yeah. I noticed some leakage from one of the batteries so after some digging, I found a replacement. At the moment, everything is in pieces. Waiting for several more replacement parts before i try and reassemble it.
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Re: Toshiba T4900CT

Postby Arson » 2018-10-06 @ 23:49

I have reassembled the laptop and replaced the CMOS battery, standby battery, and floppy disk drive. I found a 26-pin zif cable that hopefully will work in replacing the one ripped during disassembly. I have also added a memory card to max out the laptop's ram to 40MBs. The power cord works just fine. However. The issue with the power continues. I have determined a possible answer as to the problem. Issue is with the power supply board. Either one of the capacitors is flimsy or failing or the power supply board is failing. Anyone have a broken/not working T4900CT that they'll sell me? I could replace the power supply board that way.
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Re: Toshiba T4900CT

Postby Arson » 2018-10-07 @ 20:43

The 26 pin flex zif cable is not sending the right signals to the floppy drive? So that isn't working.
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Re: Toshiba T4900CT

Postby Arson » 2018-10-08 @ 22:03

Power supply board is parts number: P000199380
Floppy drive part number: P000197860
Keyboard: P000199410
OEM Floppy zif cable: P000200020
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