Casio F91W Led Modification (EASY DIY)

In this tutorial I'll show you how to change the Casio LED, making the watch cooler.
Equipment:
-Soldering iron
-Tweezers
-Contact cleaner or isopropyl alcohol (unnecessary)
Music made by my friend:
Instagram: isigipsy?igshid...
KZbin: / gipsyisi

[@Raduldo]

Buddy, you and I have different definitions of "easy"..

[@ageneer5160]

😂

[@joao_teixass]

Realy

[@baz0786]

@@ageneer5160 soldering is not easy and why do an lcd replacement if the LCD doesn't illuminate the whole watch face

[@Gamer-vs3xl]

@@baz0786 just get the W86

[@Not_SatoruGojo]

What's wrong? This is super elementary and simple mod. You need only solder and blue smd led.

[@manoflego123]

As someone who has done this at least a half dozen times, including a dual-LED mod, it's a lot of fun, and fantastic practice for soldering. I literally have more trouble removing that dang strap pin than the LED at this point lol.

[@whatsstefon]

As a former amplifier tech, I totally understand and relate.

[@alfredlille]

How did you do the dual LED mod? Is there space for a cable across?

[@manoflego123]

@@alfredlille sort of, yes! With small enough shielded wire you can cram another small LED on the right side of the screen. The hard part is that in order to pull enough power for this to work you need to remove a capacitor (or resistor? I am not an engineer) and solder another small wire where it once was. I know there's a decent guide out there if you look up how to do it.

[@3dprintinglife]

I loved this video. Straight to the point, with a lot of silly jokes. Definitely not a useless tutorial

[@niloykarmakar4125]

I really enjoyed watching this useful video even though I do not even own a watch😊

[@cenzotatcenzotat8036]

Wow, great sense of humor, you are a very talent, I watch all useless video with interest and stupid smile in my face. Thanks for share.

[@josepeixoto3384]

lol you u-turn made me smile...

[@azhartalpur]

Awsome video...fun watching...specially the end part...

[@TobiKenobi1978]

"nothing better to do or can't fall asleep"...feeling seen, immediately presses like button. 😅

[@HELLO-iq5rb]

I love the humour. 😁 Great video. 👍🏻👍🏻

[@derjansan9564]

The new G-SHOCK modules (for example the GW-M5610U) have an LED instead of the good old electro luminescence backlight. Do you know if the LED of the new G-SHOCK models can be replaced that easily?

[@stefanozagni]

You know that I'm too lazy to do anything...and You also know that useless=awesomeness !! Top!!!

[@gokhanbektas2231]

my f91 is done. i like it. thank you

[@birdost12345]

I am not gonna change the led but the video was so fun to watch so I watched whole video :D

[@j.3933]

It's difficult to solder if you aren't very experienced , but after a few tries it worked and the 0805 LEDs aren't that expensive. And it is difficult to see in which direction the LED needs to be positioned. In the end my 15 year old Casio has light again, thanks! 🙏 👍

[@tydshiin5783]

A good suggestion I'll give is to get some glasses that are made to magnify and only just using that to see the markings

[@AliasEveWatches]

Cool change, I was thinking of trying out for myself until I saw the soldering portion... 😰

[@pddejager1]

Exactly

[@manoflego123]

I know it sounds scary, I felt the same way, but with a little practice warm up (and a magnifying lens) it's not as hard as you think 😊 plus you can get a cheap soldering iron complete with cheap solder for just a few bucks more than the watch itself.

[@meemee9302]

use glue

[@llluisguilherme7464]

Me too 😅

[@mohamedamer8833]

Great video..thanks alot...I have Casio a850 with normal bulb (no LED),can I upgrade this old bulb to LED? Thanks again

[@Ucfhm]

Can the second led be extended with some magnet wire to the other side of the lcd??

[@maioungarden]

beautiful!

[@ElectricityTaster]

Medium difficulty: repair the James Webb space telescope.

[@alidasoo6654]

lol, in terms of electronic repairs this is pretty simple, but I didnt expect soldering either,

[@SlapShotRegatta22]

🤣😂

[@Vogust8]

Hi Mod Casio CA-53wf-1b and put Led i really like the watch and the negative display its just that theres no led light 😢 can you help me

[@albertosp3488]

Question my good sir, it's possible to get two LEDS instead just one for making EL backlight? I had Casio 105W and would like to emulate with a F91

[@erwinmalimban2197]

Would it still work if I use slightly bigger led than 0805 led?

[@ManoharOfficial]

I wonder if you could add a second one on the other side. My OCD might break it if not evenly lit lol

[@Emibro]

Ho la manualità di un bradipo focomelico, ma se ti mando il mi casio, me lo modifichi?

[@TT_R89]

nice, thanks for the info on the LED type. Just a small tip, perhaps add flux when you solder since it looks like those solder joints may be cold joints.

[@ageneer5160]

Thank you very much for the tip, but I prefer, if possible, not to use flux, for a few reasons.

[@V_channel_]

@@ageneer5160 What reasons if I may ask?

[@ageneer5160]

@@V_channel_ If you use solder with rosin built inside you don't need external flux. I had some experience with various type and brand of flux, and I've noticed that some of them release , when heated, a small amount of substances (not sure what kind of substances) that can create electric path from one component to the other nearby. That can make your circuit to not work properly and I think that the best way is not to use external flux, unless you are 100 percent sure that the type of flux you are using have the best quality as possible. I specify that this is my opinion based on personal experience, it is not an objective fact.

[@chaseandrews9354]

@@ageneer5160 there is residue but its very easy to remove with 99%ISO. There is flux core wire too which is better than rosin if you dont mind cleaning up. It is good practice to use flux when soldering for best results.

[@AhmadAhmad-gh5op]

great boss.....you r sooooooo nice

[@KRAFTWERK2K6]

Instructions unclear. Now the battery glows and the LED became a battery.

[@snobknob]

More vids please I love it 😆

[@ageneer5160]

Work in progress....Stay tuned ;)

[@SlavaVB]

if you want to test LCD segments i think you can press all 3 buttons at once...

[@Bumchewy]

This was fucking epic

[@johntate5050]

Coolest watch ever.

[@axinus1841]

Can I use 1206 instead of 0805?

[@MoshiourRahmanShikder]

Bro You have a great taten watch ⌚ replace 😊😊

[@watchmakerful]

One more hint (for modern versions of this watch). Replace the 180 Ohm resistor near the LED by a 39 or 51 Ohm one.

[@ageneer5160]

Are you sure about that? Are you sure that changing the resistor can't burn other components?

[@FortuneCookieMeditation]

I like your sense of humor and style of wording. I really enjoyed your useless tutorial. Heheee

[@ageneer5160]

And I really enjoy your peaceful music.

[@thesurvivors7876]

Can you modify f91w timer

[@SlapShotRegatta22]

Why type of solder did you use?

[@mohamedkandalucasgamerplay4093]

I had green lights but i want blue also is there a red one

[@MuhammadAhmed-kf1uh]

Making Sure

[@brendanhurley8780]

Nice video, I wish I had the sharp eyesight and a steady hand to do the same. Got any more videos?

[@ageneer5160]

I hope you mastered handling it in the meantime. Yes, I'm busy making a new video about ESP8266. It'll be uploaded in approximately one month.

[@johnfordcoleyleyson243]

thanks for this video, i learn it,can you make video how to hacked TIMER in casio a168 or f91w.

[@popkorn300]

Do you know what song it is ?

[@TomasWatchReviews]

next useless tutorial.. :D :D I like your attitude :D

[@ageneer5160]

:D

[@zivkovicc1]

Cool

[@yeswevape2039]

1:28 ... cmon dude - this music killed me XD

[@MrKenny777]

You made it look so easy that I'm going to try it myself. Now what was that bit about polarity?

[@ageneer5160]

The diodes, included LED, have a polarity. So you have to pay attention to the positive and negative side. Specially in the smd led, the polarity is represented by very small signs. Anyway, if you make it wrong, usually, nothing important will be happen to the circuit.

[@SymbolicSplenetic]

@@ageneer5160 "nothing important will happen to the circuit" *presses light button on watch* Meanwhile, 30,000 feet above, on a 747 jumbo airliner: "SHIT, MAYDAY MAYDAY, WE'VE LOST ALL CONTROL, WE'RE GOING DOWN FAST! WTF JUST HAPPENED!?!??"

[@ElectricityTaster]

Now don't talk to me about the polar bear

[@young_of_the_mill9560]

Can you solder led sideways so it shines across?

[@erencatak7773]

nice

[@lukasmax6984]

Can you buy a F91W with a broken movement and a A168 with a scratched up case and then put the A168 movement into the F91W case so that you will get a F91W with electroluminescence power?

[@ElectricityTaster]

movement? do you call youtube videos "tapes"?

[@lukasmax6984]

@@ElectricityTaster yeah I know, but that's how professionals refer to the internal mechanisms of a watch, I think. I'm not sure. I'd personally just call it electronics since in a digital quartz watch there are no moving parts usually.

[@SianaGearz]

@@lukasmax6984 You can call something a "movement" if it has moving parts like quartz, wind-up or automatic; or a "module" if it's purely or mostly digital. Though i personally don't mind someone calling a digital module a "movement" or even "calibre", after all industry misnomers are kind of just a thing that happens. I have an A168 here actually but i don't have an F91; however i have an impression that the module will not fit, or at least will not fit trivially, you may need some rework and it can be very difficult or impossible. The cutout for the screen placement is different, since the EL boost drive transistor and transformer have caused the screen to be placed differently. Furthermore the EL tape and the gold spring contacts connecting it to the PCB also take up a substantial space in thickness missing on F91, so the internal case dimensions of A168 is larger in thickness as well.

[@mikereddroppe9250]

I tried to do this. fit a genuine In to a fake . But the Internal moulding was wrong.

[@user-lb9cs6dj2f]

Огонь!

[@masterman7166]

Subscribed, i will try to do this

[@ageneer5160]

;)

[@masterman7166]

@@ageneer5160 i failed doing it lol now i have a wonderful Casio F-91w without light

[@ageneer5160]

@@masterman7166 ahahahaha try it again

[@conymascarenhas6793]

Nice, but feel not to experiment on the change of the Led from green to blue. Is Casino listening.

[@kira07]

dude you should make more videos !

[@logiciskindness]

A red LED version would be awesome!

[@Gamer-vs3xl]

Ikr it would look 🔥

[@saadmaanshahrier2]

I have no experience with soldering,nor I have soldering iron. Most importantly I dont have a f91w😂But it looked easy and the video was fun.

[@CulturaMaker]

LOL, nothing better to do and can't fall asleep. Perfect!

[@gsstar007]

Hi macha nice video....

[@ageneer5160]

Thank you macha :)

[@Tulisan777]

Just felt sorry for the watch screen being scratched by the wooden table over and over again. Good thing there were gloves to prevent unnecessary finger smudges especially for the internals, but what about the watch screen? Would be nice to see even a soft cloth on the table for such purpose.

[@ageneer5160]

Not even a scratch, but thank you for the advise and for the sub, I appreciate it.

[@sci-fyguy7767]

Old Mouse pads work well for watch work & modding of F-91W’s.

[@ainteligencia_vibe]

Yes Man, is god altetion

[@danielhao123]

👋 how to reset the watch?

[@herberar]

Anything but useless my friend. Thanks a lot!!!

[@L_Fleury]

You did a great job showing us the polarity of the LED but you didn't tell us what side goes where on the PCB

[@TeymurBagirov]

+ is up

[@ravindraladdad6936]

how to fix case jam buttons

[@notyourgrandadswatch7705]

Very good tutorial but one thing to do next time is have some macro shots giving viewers a better idea of what it is that your doing. Especially because the led is so small. Other than that no complaints here.

[@Chris-wj4ze]

OK, but what effect will this have on the battery life?

[@ageneer5160]

The difference between the two led in terms of power consumption is quite low. Additionally, the lighting time of the led during the day is negligible.

[@manoflego123]

It will drain much faster because you will be so happy with the new light that you won't be able to resist lighting it up every few minutes just to see it, something no one would want to do with the stock LED.

[@ageneer5160]

@@manoflego123 :D

[@heemajoshi847]

@@manoflego123 spot on hahaha

[@martinss1491]

Yeah

[@udbhavkedilaya5706]

Give me a heart

[@ageneer5160]

nope

[@DarylSkinner]

Or can buy the slightly better watch for £17.00 that has the luminosity side to it

[@GuidoChiabrera]

You sound very Italian :)

[@Randomizer92mx]

Hello. Its a me, Mario!

[@palacho6059]

Come mai si illumina solo sul lato sinistro ?

[@Goldenlsr]

The intro 😂😂😂

[@L_Fleury]

I absolutely toasted a watch trying to follow along. I couldn't seem to apply the solder to the board or the led like you did and one of the light contact points ended up coming off in the process. If you could remake this video with a longer explanation and better camera angles, that would be much better.

[@SianaGearz]

Iron too cold, too hot, low quality solder without flux, burned the flux while you were handling things? It cannot be the purpose of a watch mod video to make you proficient at soldering, it would be an arbitrarily long video, up to hours long.

[@ageneer5160]

@@SianaGearz Straight to the point, thank you :)

[@RobertNES816]

I think I'll take the easy route and buy the F105, W93h or W217 lol. I can't believe how bad the Backlight is on the F91! Even my old DW5600C from 30 years ago has a better backlight! Casio has had enough time to use even a slightly better backlight in all these years.

[@chaseandrews9354]

the f91 is just so slim though

[@RobertNES816]

@@chaseandrews9354 the f105 is slim to. I mean they're both hardly noticeable. They're both small watches.

[@chaseandrews9354]

@@RobertNES816 f105 isnt enough of a step up, better backlight sure but no 50m water resistance

[@chaseandrews9354]

@@RobertNES816 What you really want is the W-217H

[@RobertNES816]

@@chaseandrews9354 I actually returned the 217h. I didn't like how Casio designed the crystal graphics also the backlight was weird.

[@user-st1kn4yr2w]

拉登同款👀

[@francescocupi8544]

Sei un grande, mi piacciono tutti i tuoi video, questo un pò meno!!!!!

[@user-qi5bq8yq3s]

Nice bro... I like it .. please give it to me ..

[@vipnetworker]

I would gladly pay someone to do this for me. There is zero chance of me doing this and not breaking the watch, burning myself, possibly burning the house down.

[@Jacob_EstateAgent]

Man why you call me out like that in the end , it ain't laziness but it's damn tough

[@khullaasaand]

I need to get an engineering degree for this

[@user-2df90a0z1]

I' 'll buy the one with the better backlight lmao! This is too much work lol!

[@webspaghetti]

From the thumbnail pic it would appear it took you, 6.5 hours to do it 😉

[@BHDRO6]

1:25 bizim bilal burayada gelmiş :D

[@techtinkerin]

Downside, it uses more power so lasts less years, is too bright in pitch darkness to see easily, or when you don't want to give your position away. The green is perfect as it is.

[@jeroboam4486]

False, the original led doesn't show shit at night. I can't speak for the mod since I didn't do it. Back when I was wearing these kind of watches in the 90s I was swearing by Timex Indiglo, the illumination was perfect. I hope other manufacturers have caught up since then.

[@ElectricityTaster]

@@jeroboam4486 It's perfectly useable, you just need to stop walking and get it closer to your eyes. It's just annoying if you have OCD because it looks like your toast is not properly buttered.

[@aarronjones64]

@@ElectricityTaster I hate fumbling in the dark for my reading glasses just so I can see what time it is..

[@ElectricityTaster]

@@aarronjones64 at your age, the hourly beep should be enough to time your meds.

[@Tonyv1951]

@@ElectricityTaster A hilarious answer..... Cheeky though :)))

[@Atombender]

Could have just bought an F-105W

[@egebilir8549]

Yeah seems very easy, I also liked the fact that no tools needed

[@jasmachugh4222]

Easy...IF you have a soldering iron

[@ageneer5160]

Buy it, it can be a good deal.

[@metallitech]

Perhaps there's space for another led on the opposite side.

[@Vedant-M]

One thing I am sure of is I will ruin the watch once I open those 4 goddamn screws.

[@jauhuanna819]

Next useless tutorial should be how to make negative display on Casio watch

[@manoflego123]

That one is simultaneously easier and harder, as someone who has inverted several Casio watches.

[@stevenrobertson6656]

Just waisted my time...I'm too damn lazy to change the led

[@justmeeagainn]

This is not exactly easy.

[@victorlgcarvalho]

The green light is a part of this watch as much as its black case, the rubber bracelet and the sounds it makes. So no, thanks.

[@Das_Teej]

I just destroyed the PCB…..😂

[@lamebubblesflysohigh]

You cant overheat this pcb with soldering iron silly... there is a video on YT where they set washed this watchs at 90° temp, then dried them in dryer, then sprayed them with break cleaner and set them on fire and they still worked flawlessly. In order to kill this watch they used propane torch and it still took more than 5 seconds to stop working xD

[@ageneer5160]

Overheating a pcb can cause component destruction or degradation. For example, an smd resistor typically has a maximum solder temperature of around 300 degrees celsius. So why risk ruining something just because you saw a video where they set it on fire and it worked, it could have been a lucky event. Anyway, thanks for watching.

[@lamebubblesflysohigh]

@@ageneer5160 pls don't ruin my meme with facts xD

[@tycoontal2039]

If you are not an electronic engineer don’t ruin your watch !! 🙁

[@GmRb79]

enjoy being an idiot and messing your watch while saying goodbye to your warranty and at the same time forgetting to upgrade to a better battery...

[@on4x]

Русский?

[@jeeperspeepers8323]

Why bother?

[@TruthTriumphs786]

Waste of battery

[@abhijayarjunan1080]

More useless videos about f19w necessary upgrades.

[@user-dg5js4mk3p]

not easy,,