IBM ThinkPad 750C & 755C (Type 9545)

It has been a while since last time I write a display article. What I would like to display the ThinkPad 750C and 755C.

  • Product name: ThinkPad 750C / 755C
  • Manufacturer: IBM
  • Type: Laptop
  • Release: 1993 / 1994
  • CPU: Intel 80486SL-33 / 80486DX2-50
  • Hard Drive: 170MB / 340MB HDD
  • Floppy: 1.44MB / 2.88MB
  • RAM: On-board 4MB-8MB Extension 16MB
  • Screen: TFT LCD,TN Normal-White,256-color 640×480 10.4″
  • Sound: CS4248 WSS
  • Interface: 2xPCMCIA + MIC + Headphone + Port Replicator
  • Power: AC + Li-Ion Battery
  • Weight: 2.8 kg (Including the battery)
  • OS: DOS / Windows 3.x

There isn’t too much to say about this laptop, pictures tell the story.

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NDSL quick fix

One of my classmates gives me an NDSL which doesn’t turn on. After received that, I tested and found that it do powers on, but it will shut itself off after blinking the upper screen. Normally two screens should come up together. So there is a chance that there is something wrong with the backlight of bottom screen, the NDSL cannot sense the current so it shuts it self off.

There are two possibilities, one is that the screen itself is broken. The other is that the driving circuit is faulty.
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Play with the front light module

Front light mod is quite popular among vintage handheld game console players. These machines usually have a reflective screen to save power, which is hard to read compared to other contemporary display technologies. And a front light is a quick and easy fix for that, also providing acceptable quality.

Here I got a front light module from an old PDA. Apparently it can be used to mod many different things!


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