Susanin79 wrote on Yesterday, 14:08:
Bought this laptop:
Chicony NB5625. Intel 386SX @25MHz CPU; 1MB RAM + expansion board; 9.5" Passive Grayscale (32 shades) LCD @640x480 (does not work from sellers description); no power adapter included.
Will try to return it back to life.
Ooh, that looks really cool - I like the detail on the lid. It's got that same grey-brown plastic coating that my Veridata laptop has: Re: Bought these (retro) hardware today
Hopefully you can get the LCD working with recapping it potentially? Hopefully it's fixable since I feel that the mono screens give the laptops from this era a lot of their character.
Yesterday I received this Compaq LTE Elite 4/40CX laptop - it was being sold untested and I thought that for £30 in total it was worth a go:
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And it was, it had the memory expansion and the HDD caddy along with a working hard drive. Wow! Untested Vintage laptops are my favourite lootboxes 😀
But oh the list of things wrong with it:
- Does not turn on - this was the easy part to resolve
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- LCD has 'vinegar syndrome' where the front polariser is starting to break down. There's a 45 degree line on the LCD where it's starting to go and there are air bubbles forming. That wasn't visible in the auction pictures but oh well, it comes with the territory of working with 30 year old computers
- Two missing keys, I'm planning to 3d print them but haven't got as far as CAD / measurements yet
- Missing trackball and the clip that would hold it in place. Don't know if I'll bother trying to fix that, a regular mouse is better
- Completely destroyed hinges
That last one has been the major problem, the geometry of these hinges is such that they can only fit the original cast metal parts in the space of the mountings and hinge covers. As far as I can tell, there is no source of replacement hinges so if a Compaq LTE Elite has busted hinges, that's that.
These hinges are broken in 3 ways:
A. Broken metal that connects the LCD section to the friction hinge through the use of a splined shaft. This means that the mounting of the LCD to the hinge is completely loose, floppy screen. It just clicks where the splines are just clicking from one position to the next, so the lcd can't make use of the friction hinge part.
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How I fixed the loose splined shaft
This round section was splitting and broken into multiple pieces where the material strength was overcome by corrosion, overtight friction hinge or bad angles caused by loose screws and the damaged segment of the solid section of the hinge visible above.
This round segment connects the splined metal shaft of the friction hinge to the LCD screen.
Because it was broken, the LCD screen section of the hinge could not apply meaningful force to the shaft and would instead 'click' as the round section rotated on the splines of the shaft instead of keying to it.
To resolve this, tape was put around the round section to give a circular shape, then epoxy was dripped into the hole for the flange. Once enough epoxy had been dripped in, the flanged shaft was placed inside, escaped epoxy was cleaned up and it was left to harden.
While it was hardening, the part was checked to ensure that the epoxy was not stopping the shaft of the friction hinge from turning and some excess epoxy resin was cleaned off.
The full force of the hinge was not tested again until the glue had been allowed to harden for 8 hours.
B. Broken mount on one side of the LCD housing part of the hinge - this was fixed by using a metal plate and some clear tape that was cut and folded on itself to make an 'epoxy bucket' to make a structure for the epoxy that won't interfere with the screw mounting points or LCD front bezel plastic.
I got a lot of my ideas for this from this page detailing how to fix Compaq Contura hinges: https://www.dreamcast.nu/en/compaq-contura-42 … p-hinge-repair/
See the text on this image for more details on how the epoxy was given shape without messing up screwthreads or plastics:
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C. The hinges on both sides have broken mounts that hold the hinges to the chassis - this was fixed by using blutack to make an 'epoxy cup' structure to pour resin into the only space available in the hinge mounting area. See the text on this image for full details:
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3 separate stages to the overall repair but the hinges are now working pretty well! Oh also, although this laptop says LTE ELITE 4/40CX on the lid, you may have noticed the heatsink on the CPU card? That's because it's really a 486 DX4 75MHz, making this an LTE ELITE 4/75CX with a cute little 8.4" VGA LCD panel