Powerbook 190cs full refurbishment & re-cap

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Steve
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Joined: Fri Sep 15, 2017 11:49 am

Powerbook 190cs full refurbishment & re-cap

Post by Steve »

Hey guys,

Guess what, I also restore Apple machines lol :) You know why I was excited about this machine? Because MagicMac on an 040 Mac is an absolutely stellar experience! I can't wait to run some super fast Atari apps on this :)

Here is my post about refurbishing this lovely little machine. I've never worked on a PB before so it was a learning experience. I didn't photograph the MANY brittle plastic tabs/screw mounts I fixed with ABS glue - but yes, I had to fix many. Without the glue the machine would not screw back together, I'm glad I managed to save everything. I re-capped the machine with the best organic polymer smd caps from Panasonic. The machine had the worst battery leakage I have ever seen, luckily only a small section of the power/input pcb had any corrosion which I managed to fix.

The original passive screen was actually in good condition but the internal display cable was faulty causing these line artifacts. So I decided to order a new screen from a 5300c which is an active matrix LCD & a new display connector; note that the display connectors are different and you have to have the proper cable for the particular screen. There were also different brands used. FYI this particular type of screen is still available today in large quantities as it was a highly used industrial display. I will update this post with some model numbers to help people out later.
original_screen.jpg
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This machine has the full 40mb RAM! This is so great since they are hard to find these days
original_specs.jpg
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The battery looks to be in a sorry state... makes me wonder what the inside of the machine is like (the outside is pristine)
battery.jpg
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The insides have seen better days!
battery_leak1.jpg
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The copper base sheet is in such a state of corrosion it cannot be saved (I did try) so it had to be discarded
battery_leak2.jpg
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Luckily the PCB is untouched apart from a tiny segment of the power section
original_pcb_1.jpg
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original_pcb_2.jpg
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With a solution of 50/50 white vinegar & lemon juice I neutralise the acid
pcb_cleaning.jpg
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I bathe the screws in the same solution
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The touch pad screw plastics had broken, but managed to repair them with some good ABS glue.
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The PCB & body after being cleaned, much nicer!
before_recap.jpg
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The capacitors replaced with high quality organic polymer panasonics.
after_recap.jpg
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The 5300c display - I actually found an apple parts supplier in the UK that still had a 'new old stock' one sitting in their warehouse!
5300c_screen.jpg
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Yes it fits nicely - note, it requires the specific display cable for this model
screen_fits.jpg
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Glorious 640x480 256 colour active matrix
screen_works.jpg
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She is happy :)
bootiful.jpg
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Hope you enjoyed this restoration! I have a couple of little things left to do: * replace the prom battery / * fit IDE > CF and re-install OS
stephen_usher
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Re: Powerbook 190cs full refurbishment & re-cap

Post by stephen_usher »

An excellent restore! What's the brand/type of "ABS glue" you use?
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
Steve
Posts: 2056
Joined: Fri Sep 15, 2017 11:49 am

Re: Powerbook 190cs full refurbishment & re-cap

Post by Steve »

It was this one:
https://www.ebay.co.uk/itm/372652376101

For acrylic and abs.

It's really nice. Doesn't stick to your fingers like super glue either, also doesnt leave any of that weird oxide layer super glue leaves.
stephen_usher
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Joined: Mon Nov 13, 2017 7:19 pm
Location: Oxford, UK.
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Re: Powerbook 190cs full refurbishment & re-cap

Post by stephen_usher »

Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
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Umberto1st
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Joined: Wed Sep 27, 2017 6:27 pm

Re: Powerbook 190cs full refurbishment & re-cap

Post by Umberto1st »

Nice work
3)1040 stf/m, 2)Mega 4 ST, 1)STE, 1)Mega STE, 1)STacy, 2)Falcon 030
Steve
Posts: 2056
Joined: Fri Sep 15, 2017 11:49 am

Re: Powerbook 190cs full refurbishment & re-cap

Post by Steve »

Recently I was shown a horror story of capacitors inside the screen inverter board & display unit going bad and ruining someones old powerbook. I then realised that although my screen was new old stock, the caps were still 30 years old and have a shelf life. I opened it back up and replaced the caps. FYI I didn't have the correct size SMD caps in stock, so I shoe-horned in some radials. Not pretty, but this stuff is on the inside of the screen so it's not like you see it :)
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PXL_20201004_152052273.jpg
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rubber_jonnie
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Re: Powerbook 190cs full refurbishment & re-cap

Post by rubber_jonnie »

Good idea replacing the caps on the LCD board, those little aluminium surface mount caps are really nasty when they go, just one tiny one caused me hours of repairs on my Amstrad Alt-386.

Might I ask where you got your screen from? I am trying to get a battery for my Powerbook G4 17" and struggling like mad, so looking for any potential suppliers.

Nice resto BTW, looks like new!
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Steve
Posts: 2056
Joined: Fri Sep 15, 2017 11:49 am

Re: Powerbook 190cs full refurbishment & re-cap

Post by Steve »

@rubber_jonnie
From VIS:
https://www.applemacparts.co.uk/

Really nice old-school stockists. They know their apples from their pears ;)
Happy to recommend them as they did a good deal for me when I asked.
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rubber_jonnie
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Re: Powerbook 190cs full refurbishment & re-cap

Post by rubber_jonnie »

Steve wrote: Mon Oct 05, 2020 5:23 pm @rubber_jonnie
From VIS:
https://www.applemacparts.co.uk/

Really nice old-school stockists. They know their apples from their pears ;)
Happy to recommend them as they did a good deal for me when I asked.
Cool,thanks :)
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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