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EEVblog 1527 - Toshiba T1000LE DOS Vintage Laptop Repair HELL

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c64:
Dave if you feel lucky, there is one on eBay now

https://www.ebay.com.au/itm/304988392304

EEVblog:

--- Quote from: c64 on June 24, 2023, 11:12:33 pm ---Dave if you feel lucky, there is one on eBay now
https://www.ebay.com.au/itm/304988392304

--- End quote ---

Sadly not the same model. Could have done a screen swap if it was.

FuST:
Just stumbled upon this thread, I might be able to help some people out here.

I'm a bit swamped at the moment but I can provide measurements and/or 'scope shots from a couple of working T1000LE's to cross-check if someone wants to.


--- Quote from: GRADIENT on March 16, 2023, 03:23:18 pm ---Some traces in between the IC505 and the C506 cap were corroded. I doubt, but I'm just wondering if anyone has removed IC505 and has a picture of the PCB below the IC.
--- End quote ---
I can take some pictures if you're not comfortable removing it from your board.
I'll have to dig up one of my machines and suck the IC out when I find the time so it'll take a while, trying to figure out which rail is failing is probably a bit quicker.

My usual approach with the T-series PSU sections is something like this:
- Remove all large capacitors used in the buck/boost converters (the ones hanging of the side of the board on the T1000LE.
- Thoroughly clean the board with vinegar, water and IPA to remove all the gunk
- Replace with new caps (I tend to use Panasonic FC series)
- Hook up a 'scope to all the power rails (+5, +12, -12, -22, they're the jumperlinks near the center of the board)
- Set to single-shot and power on the machine (a 4-channel 'scope is really handy for this), check for misbehaving rails.

That way it's easier to narrow down the problem to one of the voltage rails instead of trying to look at the board as a whole.


--- Quote from: vasonline on February 05, 2023, 10:46:31 am ---I attemped to draw a (sort of) schematic of the PSU (very incomplete)

I'll post it here, maybe it is helpful?

--- End quote ---

If you could upload the files somewhere that'd be very helpful.
I can see if I can combine it with the incomplete schematic I have for these and perhaps create a complete schematic for this machine.

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