Casio F-91W Screen Modification
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- Опубліковано 10 лют 2025
- Super excited with this one. Replaced polariser film on Casio F-91W watch with the one I stripped off an old Nokia phone. Simple LCD screen modification, but looks better than I expected!
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Casio F91W:
(US) amzn.to/2XNvhZu
(UK) amzn.to/2GMQ8GG
Screwdriver set:
(US) amzn.to/2IJex1R
(UK) amzn.to/2UHJ6qj
Cutting Mat:
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(UK) amzn.to/2XMKUjI
Music: ED-209
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i did this in 84
nothing new here.
Cool why didn't you make a video to teach everyone else?
@@Techsas 1984 lol
@@picklewiickle.1583 Yeah you just like to keep it yourself you greedy old man
Considering the F-91W didn't come out until 89', no. You did not.
@@ArmLessChief i know i did because i was holding my moms hand because i was very young, i wasnt holding my moms hand at 19 in 89.
Fantastic. Now it is unreadable like any inverted lcd display.
True
You've been buying the wrong type of negative display watches.
you're just bind
well my g-shock has the inverted display and it's perfetcly readeble
what a "negative" comment
i love this watch so much
i have 6 of them in different colors
one of them is from 1994 and it still is running and original down to the bone
Possibly the best watch maybe ever
Keep in mind, the F-91W came in black and only black, so if you have an F-91W in any other color, it's a chinese knock-off.
HΞLLBΞNT where are they made again? That’s right 🇨🇳
@@Heidegaff nope they made then in few color options later on the original release was only black
Es recomendable usar guantes o de lo contrario dejarás las huellas digitales en el cristal... Saludos!
Special invisible display - only _The Predator_ can read it.
I like it! It gives that 8bit-ish vibe.
This is awesome! Keep up the good work!
Thanks!
Dude, It's like f91w's receiving software updates. lmao 😆
I'm not dyslexic, but I read your channel name as "TechAss" 😂
Let's keep it that way
Same
Thanks for sharing. I love seeing how people do things, the tools and techniques used, etc. Looks sharp!
Thank you! Another Casio watch modification video is coming soon...
My favorite Watch F91 😍😍😍
Anwar yes
Mine with black screen, cool
this is exactly what i was looking for ,thanks
Happy to help
So is that a special polarizing film. Or does everyone change colours like that. I wanted to get some but I don’t want black. Really want red
@ 6:15 After you peeled the film from the display, there was a point during the pre-assembly test firing that there was a segment missing from the #4 in the minutes. Was that from pulling the film too hard or was it from when you squeezed and pressed on the display? Either way, did it ever work itself out or did it get stuck like that? Also, not that it really matters because it already sucked right out of the box, but how did this process affect the backlight?
It's a cool mod. I don't see where the others say it ruined the display by making it unreadable, from what I can tell, all it did was change it to negative, exactly like any other negative display watch. Also, one more question because I couldn't tell because of the camera angle, the lighting and my own semi-poor eyesight, but... When you were spinning the film around on the display before cutting it to fit, were you getting multiple patterns depending on how it was positioned, it was it just full on and full off?
The missing segments happen when connection to the screen (that long rubber piece) is not aligned properly. Light is as useless as original. Depending on polariser film you can get different colors. In my case one side did normal to inverted screen and the other side introduced different colors depending on the angle.
Thank you for the kind word!
@@Techsas
Cool thanks for the info. I guess now I just have to figure out what devices I want to tear apart for their polarizers. I've got tons of choices since I never throw away or otherwise rid myself of any phones, mp3 players, calculators, etc so I guess some experimentation might be in my near future. Thanks again for the info.
Bass pick comes in handy.
Beautiful mod 💙
You are an artist❤❤
Deep down in my heart
@@Techsas ❤❤❤
Wow dude that's so cool!!!
why not sale our modification
nice work
Thanks!
yo i juts relived my childhood with this!
My dad used to bring me lots of this to wear, but me as a gypsy, I always opened them up! I know how every piece of that feel.
My sister gave me a huge 250$ watch to wear to my suit. but I went for a refund it cos needed the money to fund my startup!
So while I was waiting in the Jewelry shop, Casio came into mind... what if...? and so I ask if I can have another watch instead and the good folk said
- We can do anything, which one you want?
- That one! I said launching toward the watches shelves. he kindly followed me, open the glass windows and I immediately touched a superb clasic w59 that was on sale for 17 GBP had been previously 24GBP. I looked at it, and at all his brothers, around. The fake rolex, The Sport version, the Silver one.. but since I touched this one first, I grabed it from the saleman's hand and I said:
- It''s This One!
Programing it first time, oh maaann it really was like driving a bike. In Casio terms, GENIAL, simplisticorum, INTUITIVE.
I got at home, and I googled this watch! It is IMMENSELY popular among geeks, moreso, Bill is wearing it and for me, as an Entrepreneur, operating from a suburban shed, is extremely inspiring and I got nothing to say no more!
Today I said im gonna look into the hourly alarm beeping. and I thought to myself. Maan I think mine couldn't possibly have that function, maybe the one with 4 buttons .... (because im brainwashed by media and curent business that you always have to expect less that what you pay for.
But wasn't I more wrong in disconsideting this absolute HERO watch, with TIME and close proximity environment changer... IT IS THERE WORLD! I have it too! and I think is the single most powerful weapon for productivity.
I finetuned syncronize it to atomic clock. Missed the sync by under 01 sec, so I had to wait one more minute, waiting with my hand on the trigger to hit that exact spot +0,1 into the future, so I always 0.1 ahead! I set the daily notification and im more ready than ever!
Thank you, Casio!
You must be a writer.
@@Techsas Casually Inspired! thanks! :)
You keep up your dope job on YT Channel! big up bro!
This is quite possibly the most important and inspiring quote that I have seen on UA-cam. Thank you so much for this story. My life has changed for the better just by reading this.
Damn
If u don’t mind me asking , why didn’t u just buy a 18mm instead of adjusting it like that ?do u like the fit better or did u just so happen to have a bigger size around ? I wanna get an 18mm but I hate how it has that gap sometimes. What made u cut it out instead of making an adapter peice ? Thanks in advance !
awesome Work!
Thanks
Thanks for your video greats stuff!!!
Haha I thought I broke the watch until I realized I forgot to put in the polarizer. You can't see the numbers without it!
Haha... That happens every time
As a mechanical watch aficionado my mind keeps howling “finger cuffs! where are your finger cuffs! Oily fingerprints everywhere, nooooooooooo!”
Awesome!!
If i touch thar little black strup with my hands, will it stip working. Because the little black strup fell out of mine while j was trying to install a light spreader. I pucked it up and put it back in and the display was scrambled. Then i tried to clean the contacts woth alcohol and now its just dead.
Looks great! Have you seen Pura custom multi color Casio mods? I wonder how’d they do that? If you know and can post a video of it that’ll be awesome:)!
Came here for the same reason
Pretty sure they j use multiple polarizers and layer the strips instead of j one. They also fill it w oil which makes it clearer and visually brings the display foreword.
That's sick!
Thank's!
Badass!
is the polarizing film from the old phone anything special or will standard adhesive polarizing film work as well? do you adhere it with anything, or just place it in front of the LCD?
Cool looking. Im not fucking around with my f91w though.
I love your videos 😎💕
Good work man
Thanks!
I wanna do this but I don't have an old phone to strip for film :(
really cool
Do you have any other device with a screen? Even a calculator would do... Or you can buy a polarising film on ebay, but I can't promise if it will give the same color.
@@Techsas Oh if a calculator works I can just grab a cheapo one at dollar tree and use that! Thanks man!
@@AhSoFresh You can definitely try!
Buy a polarizing film.
rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.pl%2Fulk%2Fitm%2F223352516797
Amazing.
Very cool
Ain't nobody got time for that!
But apparently everyone has time to watch my useless videos
I did this exact same thing on my yamaha fzs speedometer with duel tone, tachometer golden speedometer white, but still i dont get enough courage to unscrew my g shocks 😕😕😕, i just keep on seeing videos only, may be one day will go for the cheapest model I have DW9052 rather than my Rangeman. But thats vintage I don’t want to break it
what did you do to remove the adhesive from the screen?
rubbing alcohol didn't get me far
excellent video
Thank you!
I also have a f91w and a158w 👍
Very cool
Why don't they make them this way in the factory?
Thanks.
I am a fan of inverted displays) Maybe will buy 5600 and do this. But where to find different filters?
A polarising film from Ebay will do just fine if you want to invert. To get different colours I used a film that I peeled off an old phone.
Casino saat güzel olmuş eline sağlık abi
I did this without taking the module apart
I have the g shock dw5600 ms-1 which has an inverted lcd with red digits. Could I change this to non inverted without it being a bright red background then? So say black digits and subtle red background?
Nice mod!
Thank's!
Hey, what time is it? ehhhh..... ummmmm.... aaahhh..... mmmm..... aaaaa...... mmmmmmm.....
You took it from good to bad!
That is also how my life is going
Doesn't this invalidate the warranty ?
I'm sure it does, but it's 8 dollar watch, not a big risk.
cool bro, how to stick the polarizer back to the lcd? no glue needed?
most polarized film on ebay are self adhesive. The one I used holds perfectly without glue if cut to shape.
Mi querido amigo es usted muy creativo para hacer eso lo felicito en hora buena
Thanks amigo
This I used to do when I was in 3rd standard😆😆
@Late to the Game hey i might be a bit "late to the game" but it means 3rd grade in school. Indian thing.
Pregunta: en el casio prot treck prw 3000 se puede cambiar la pantalla de clara a oscura, como lo muestra en el video del casio ??? Gracias
Yes it can be changed.
yo u think the f105 module would fit in the f91w? that would be a pretty dope mod.
I don't know but I'll find out. And if it does then that will be my next video!
Can I buy one with negative lcd pre installed from you
Your underrated
Oh thank you!
Hi! Love your vids. I am having difficulty changing this watch buckle and the strap retainer, I can't seem to push the spring bar to release them, and i searched EVERY where to find if anyone did it before on this watch but no one has. Do you know how to do it? If you do a search, no one has it on UA-cam thus far.
Hey! On F91W it's actually not a spring bar it's just a... bar. It has no springs so you have to push it from outside. One end of that bar is flat and the other is pointy, push the pointy one and it should pop out. There is also and arrow on the back of the strap that shows where is the pointy end. So to take it out push in the different direction.
@@Techsas i see,, but are you referring to the strap or the plastic buckle? I do know that the method you mention above can remove the strap but for the buckle, is it the same??
@@Michael-lo7sq oh sorry I thought you were talking about the strap. I'm not sure how to remove the buckle, I have never done it myself
@@Techsas hmm i see, I have never seen it done on youtube before. =(
Forgive my ignorance but why do you have to do all that? I take you can't just put some kind of coloured film on the underside of the lense?
Is there any benefit to the mod, other than it just looking less conventional?
There's no benefit here
Good work man ! I just bought a brand new one for myself and it's the best watch I ever had!
but it pains me to see a nokia getting damaged . but no worries its for a fantastic mod for a fantastic watch!
Haha I love Nokia too but it hurts more to see it sitting on the shelf! Thank you
Can you achieve a similar effect with polarized film?
that is polarizer film
Why do this? First, the F- 91W is currently a smaller watch. Second, the Casio in the video is more of the size of the W-217H . Third, is this a real Casio watch??
Yes
Am I right in thinking I could use polarising lens from old cinema 3D glasses to achieve this?
Definitely yes!
Amazing
Thanks!
hello I think it would be easier instead of undoing the clock just cut to size of the cover
I still need to remove the original one
@@Techsas same you must have a lot of patience I think I do not have, greetings from durango, mex
@@omarlugo5496 I just really like it
Not bad not bad
no way am I going to be able to do that lol
Yea. its compilicated engineering shit
What kind of polarising film could be used for that and where would I be able to get it?
I used a film from old Nokia phone. Other polarising films that can be bought on ebay doesn't have the same effect....
@@Techsas only the Nokia 3510i good for this purpose or is there another type? Thanks!
I had a similar casio with convex (bumpy) glass... Does anyone know the model?
Brilliant watches these....cheap and reliable and still sell in the millions even after more than 25 years.
I liked your mod but you broke the first minute digit, part of the '4' was missing when you were trying the polarizer screens. Did this come right after completion or was it a result of the panel being tightened up and completed within the case?
Sometimes the connector (that long thin rubber piece) doesn't align properly, taking it apart and putting back together helps most of the times.
@@Techsas thanks for the explanation as it was obviously working perfectly at the end of the video.
@@Zaphods-Third-Arm Also, if you still get any missing segments after putting it back together, there's AC (all clear) connection witch you can short with + and that would reset the screen to 12:00:00
Because of the accurate timekeeping some other brands are cheap but the time keeping it's suck
Oye una pregunta cómo sabes cuándo el Casio f-19w es original me puedes orientar
It's really hard to say if F91W is original these days. I've seen many good fakes. Open it up and look at the quality of components, that will give it away.
Sensacional você é um crânio...
Wow❤️
2:15 Hey guys, Do any of u, know some page where I could buy this piece? The screen of my watch It's broken :/
I sell negative displays on my etsy shop
How could You fix the clock screen in case it fell and half of the numbers disappeared
I think it's broken now
But you can try to open it up find a little hole where it says "AC" and short it with a metal part of the module.
Made this 35 years ago with my calculator
@Hrim80 we have a professional humorist...
S a l o m o n sliman larach vidéo good 10 ,10
Is this possible on a dw 290?
can you take the electro luminescent plates out of a casio handy enough?
I lost you at the end of your sentence. But if you're asking if I can put EL in f91w then I'm sure it's possible but I tried and couldn't make it work.
I have bought Gasio made in Malaysia the difference is just G do anyone know about this watch?
ohh man that's definitely a fake Casio
@@Techsas whatever but I can not afford Rs. 900 for Casio f-91W so I had to bought gasio to fulfil my desire.
Nice
cool video people say adding mineral oil will make a watch water-proof is this true ?
Thank you! Apparently yes. Since a liquid cannot be compressed simply filling the watch with liquid would make the watch resistant to any further liquid ingress to whatever depth since it already ís 100% full. Also mineral oils are only slightly conductive therefore it does not effect insides of the watch. That's a good idea for a video.
@@Techsas sounds interesting ill definetly tune in if you decided to put it to the test thanks for sharing
The painful moment is when you take the watch apart
Haha i got used to it
Yeah but it's only a $10 watch. If you screw something up, you just go buy another one, and the first one becomes a parts donor for the new one in case you screw something up on that one as well.
this guy was searching for the place to remove the display for ages lmao
WOW!!!
Çok yaratıcı bir zekaya sahip insan.
Awww thanks
Where did you get the tint/filter?
Nice work! By the way, I'm trying to repair a Casio F-86 that I bought in the 80's. Now I realise that the black rubber ribbon is missing. Dou you know what is it made of? thanks!
This ribbon is connecting display with main chip so you going to need another one. I'm don't know where to get one.
@@Techsas Thanks!
Robert Carcolé you would need one from a donor watch, they are called silicone zebra strips
Dumb question but what do you wipe the display with? I've made the mistake of using alcohol and it got it all blurry, no matter what I do some glue stains are left below the first film layer.
I wipe it with alcohol. Not sure why yours got blurry, never use acetone tho
Is it possible to mod an electroluminescent light to F91W?
Hi. It is possible but it's very hard. I tried it myself but failed. It requires a very high precision soldering or quite possibly making a custom circuit board. Not worth it. BUT there's an easy way. Skmei 1412 is backlit and it's module fits in f91w's case.
@@Techsas I have considered putting a Skmei 1412's module on a Casio F91W case before but the only thing that's keeping me from doing so is that it probably won't be as accurate and "authentic" as a Casio module. I don't know how accurate Skmei's watches are, but I'll give it a shot anyway. Thank you for the response and suggestion 😁
@@vanred7550 Skmei are good watches. Has a bad reputation because of a copies, but for that price they are surprisingly good. If it's -60s over a month then a would call it a success.
@@Techsas That's good to know 😁 I don't know why Casio won't "update" the backlight of F91W, I don't think the small case of the F91W is the issue since Skmei can do it in their 1412 model (albeit it's longer and wider by 0.5mm and 1.5mm respectively than the F91W), so why can't they. Similar models that have EL backlight such as F-105W and A168W are thicker/bulkier than the F91W. I think maybe it's because Casio wants to preserve the original design and features by Moriai, but an updated backlight (and maybe a countdown timer too) would be nice, since it is the most criticized part of the watch 😅
@@vanred7550 Van Red It's definitely a classic. 30 years old and still pumping millions of units per year. I would keep it the way it is just to see how long can it last. I'm sure they had discussed the backlit f91w in Casio headquarters.
Where you from brother
It changes color depending on the angle of the film?
Hi, yes. You can see that 6:15-7:00. Just keep in mind that not every polariser is the same, I had plenty polarisers from smartphone screens and they only do black and white.
Reset button is long time and other fx can change any time so i think thats not original 420 watch
Ok
how do I buy it????
👍👍
You ruined a good phone,but a good mod
I've ruined many good phones. Thanks!