Powerbook 100 Repair with LCD headaches

Рет қаралды 1,397

4 ай бұрын

#marchintosh #retrocomputing #vintagemacintosh
This one is a midweek special! Someone had sent in a PowerBook 100 for me to look at, Turns out the LCD is bad. However, this devolved into entropy which at least there was a relatively successful ending!

Пікірлер: 16

@BigBadBench 3 ай бұрын

Good to know that the panel market is a total nightmare. What a mess. Great persistence!

@AlejandroRiveraRobles 3 ай бұрын

This was so very cool!!! Thanks!!! 😀

@THEtechknight 3 ай бұрын

Glad you liked it!!

@leecremeans5446 4 ай бұрын

It looks like the signal on the LCD cable is a standard Sharp DSTN protocol; I found a datasheet for a later 640x480 panel that uses the same wiring (though with a slightly different pinout), and it looks like it'd be easy to feed into something like an RGB2HDMI. Solving the mechanical issues is a different problem, and will probably be harder than converting the protocol.

@ConsolesRetro 4 ай бұрын

successful ending 👍 and like always, nicely done, especially with to many replacement screen ! !

@BITBOARD_DEV 3 ай бұрын

take a shot every time he says "that's an issue"

@3lectr1c 4 ай бұрын

It would have been pretty sweet to get a panel with new film already installed if they hadn’t messed up the angle like that.

@voodler 4 ай бұрын

That's the same hassle I've faced trying to replace the polarisation film on an AST bravo's Sharp brand mono DSTN panel and a T1910CS's Toshiba colour DSTN panel, the colours never come out right. I think there's some secret sauce in the polarisation film for passive matrix panels that TFT's don't have trouble with. Potentially that might be a circular polariser from testing with some old reald3d glasses. I wish there was some effort to replace passive matrix panels / translate their signals to active matrix ones but from what I've learned from Wenting Zhang's info on passive displays, it might be like trying to recover image data from a low quality jpeg or have a serious delay. The passive displays use a lot of tricks to achieve the grayscale / colour levels they use. Unless there are ways to get the controller to start outputting data into a format that TFTs use, then it's a bit easier. yyzkevin did that with the IBM PC 110 TFT mod and I've done similar with converting a Toshiba Satellite 400CS to a 400CDT. But then there are some controllers that can only run passive displays so that can't work for everything.

@THEtechknight 3 ай бұрын

Well work is being done in that department, Androda has designed a functional Hosiden black and white LCD signaling to VGA converter with the Pico for the Portable, which should carry over to this thing. Now personally myself, I have not studied the timing differences between a DSTN/Passive matrix display, and an active matrix display so im not sure on that part.

@julianmartan 3 ай бұрын

i know that you just cant use tft polarisors on these B/W screens

@alexshepherd 3 ай бұрын

Yes; the result seen in the video is the best that can be achieved with the polarising films that are available today. I have experimented with all angles, at least four sources of film - it’s not the angle; it’s the fact that the original film had an additional retarder layer that you can’t seem to get today. If anyone finds a source for monochrome passive-matrix LED film, please let me know.

@alexshepherd 3 ай бұрын

I made a video showing the same problem on a Concerto kzfaq.info/get/bejne/Y6t5iqiLlpuvpKc.html

@hellhound-si5oz 3 ай бұрын

If you have a big enough vice, you can put it in there, but you have to be gentle, but you will kind of crack the plastic a little bit. Unfortunately, a little JB will to glue it back together. Or do what I do? Just rapping on tons of electrical tape

@JeffreyBenshoff 3 ай бұрын

Well, thats a problem

@charlesdorval394 3 ай бұрын

That's way pass used status, what a piece of junk.

@helfire23 3 ай бұрын

I use a Powerbook 100 as my daily driver, keep these out of the landfill and enjoy the simpler times. Posted from my Powerbook 100 running system 6.0.8