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.
@@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.
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.
@@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.
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! 🙏 👍
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.
Love the mod. Seems really hard, I built some FPV drones, but I think this pcb board is even smaller 😱 Also, your sarcasm made me chuckle 😂 However I think I will try this 😉 I think I want a UV LED, and also apply a little Lume paint to the backplate of the LCD screen. If you then use the light, the backplate will remain blue or green (depending on the paint). Also, I think a hydro mod for diving HAS to be added for 4000m+ WR. What do you think?
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?
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.
@@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!?!??"
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.
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.
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 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.
@@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.
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.
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.
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.
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.
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.
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.
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.
@@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.
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.
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
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.
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.
As a former amplifier tech, I totally understand and relate.
How did you do the dual LED mod? Is there space for a cable across?
@@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.
Buddy, you and I have different definitions of "easy"..
😂
Realy
@@ageneer5160 soldering is not easy and why do an lcd replacement if the LCD doesn't illuminate the whole watch face
@@baz0786 just get the W86
What's wrong? This is super elementary and simple mod. You need only solder and blue smd led.
I loved this video. Straight to the point, with a lot of silly jokes. Definitely not a useless tutorial
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.
lol you u-turn made me smile...
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.
Thank you very much for the tip, but I prefer, if possible, not to use flux, for a few reasons.
@@ageneer5160 What reasons if I may ask?
@@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.
Thanks for the video. GOnna give this a shot now. I think negative mod the F91w, purple LED, and dual LED mod.
I really enjoyed watching this useful video even though I do not even own a watch😊
"nothing better to do or can't fall asleep"...feeling seen, immediately presses like button. 😅
You know that I'm too lazy to do anything...and You also know that useless=awesomeness !! Top!!!
I am not gonna change the led but the video was so fun to watch so I watched whole video :D
I wonder if you could add a second one on the other side. My OCD might break it if not evenly lit lol
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! 🙏 👍
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
I'd like to see the current draw comparison.
What did you spray on the led at 2:33?
Instructions unclear. Now the battery glows and the LED became a battery.
Great video..thanks alot...I have Casio a850 with normal bulb (no LED),can I upgrade this old bulb to LED? Thanks again
if you want to test LCD segments i think you can press all 3 buttons at once...
I love the humour. 😁
Great video. 👍🏻👍🏻
Awsome video...fun watching...specially the end part...
I like your sense of humor and style of wording. I really enjoyed your useless tutorial. Heheee
And I really enjoy your peaceful music.
Cool change, I was thinking of trying out for myself until I saw the soldering portion... 😰
Exactly
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.
use glue
Me too 😅
next useless tutorial.. :D :D I like your attitude :D
:D
One more hint (for modern versions of this watch). Replace the 180 Ohm resistor near the LED by a 39 or 51 Ohm one.
Are you sure about that? Are you sure that changing the resistor can't burn other components?
my f91 is done. i like it. thank you
Love the mod.
Seems really hard, I built some FPV drones, but I think this pcb board is even smaller 😱
Also, your sarcasm made me chuckle 😂
However I think I will try this 😉
I think I want a UV LED, and also apply a little Lume paint to the backplate of the LCD screen.
If you then use the light, the backplate will remain blue or green (depending on the paint). Also, I think a hydro mod for diving HAS to be added for 4000m+ WR.
What do you think?
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?
Bro You have a great taten watch ⌚ replace 😊😊
I had green lights but i want blue also is there a red one
Would it still work if I use slightly bigger led than 0805 led?
Coolest watch ever.
great boss.....you r sooooooo nice
Medium difficulty: repair the James Webb space telescope.
lol, in terms of electronic repairs this is pretty simple, but I didnt expect soldering either,
🤣😂
You made it look so easy that I'm going to try it myself. Now what was that bit about polarity?
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.
@@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!?!??"
Now don't talk to me about the polar bear
LOL, nothing better to do and can't fall asleep. Perfect!
1:28 ... cmon dude - this music killed me XD
OK, but what effect will this have on the battery life?
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.
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.
@@manoflego123 :D
@@manoflego123 spot on hahaha
Nice, but feel not to experiment on the change of the Led from green to blue. Is Casino listening.
Why type of solder did you use?
More vids please I love it 😆
Work in progress....Stay tuned ;)
Can you solder led sideways so it shines across?
Nice video, I wish I had the sharp eyesight and a steady hand to do the same. Got any more videos?
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.
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?
movement? do you call youtube videos "tapes"?
@@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.
@@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.
I tried to do this. fit a genuine In to a fake . But the Internal moulding was wrong.
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
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
dude you should make more videos !
Can the second led be extended with some magnet wire to the other side of the lcd??
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.
Not even a scratch, but thank you for the advise and for the sub, I appreciate it.
Old Mouse pads work well for watch work & modding of F-91W’s.
Can you modify f91w timer
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.
Making Sure
This was fucking epic
A red LED version would be awesome!
Ikr it would look 🔥
Do you know what song it is ?
Ho la manualità di un bradipo focomelico, ma se ti mando il mi casio, me lo modifichi?
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
+ is up
beautiful!
Anything but useless my friend. Thanks a lot!!!
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.
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.
@@SianaGearz Straight to the point, thank you :)
👋 how to reset the watch?
thanks for this video, i learn it,can you make video how to hacked TIMER in casio a168 or f91w.
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.
Hi macha nice video....
Thank you macha :)
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 f105 is slim to. I mean they're both hardly noticeable. They're both small watches.
@chaseandrews9354 I actually returned the 217h. I didn't like how Casio designed the crystal graphics also the backlight was weird.
Subscribed, i will try to do this
;)
@@ageneer5160 i failed doing it lol now i have a wonderful Casio F-91w without light
@@masterman7166 ahahahaha try it again
how to fix case jam buttons
Sei un grande, mi piacciono tutti i tuoi video, questo un pò meno!!!!!
Cool
Come mai si illumina solo sul lato sinistro ?
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.
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.
@@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.
@@ElectricityTaster I hate fumbling in the dark for my reading glasses just so I can see what time it is..
@@aarronjones64 at your age, the hourly beep should be enough to time your meds.
@@ElectricityTaster A hilarious answer..... Cheeky though :)))
Man why you call me out like that in the end , it ain't laziness but it's damn tough
nice
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.
Or can buy the slightly better watch for £17.00 that has the luminosity side to it
You sound very Italian :)
Hello. Its a me, Mario!
1:25 bizim bilal burayada gelmiş :D
I' 'll buy the one with the better backlight lmao! This is too much work lol!
Yeah seems very easy, I also liked the fact that no tools needed
Огонь!
Yes Man, is god altetion
Nice bro... I like it .. please give it to me ..
Yeah
I need to get an engineering degree for this
拉登同款👀
The intro 😂😂😂
From the thumbnail pic it would appear it took you, 6.5 hours to do it 😉
show in dark
Perhaps there's space for another led on the opposite side.
Could have just bought an F-105W
Just waisted my time...I'm too damn lazy to change the led
Easy...IF you have a soldering iron
Buy it, it can be a good deal.
One thing I am sure of is I will ruin the watch once I open those 4 goddamn screws.
This is not exactly easy.
Give me a heart
nope
I just destroyed the PCB…..😂
If you are not an electronic engineer don’t ruin your watch !! 🙁
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
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.
@@ageneer5160 pls don't ruin my meme with facts xD
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...
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.
Next useless tutorial should be how to make negative display on Casio watch
That one is simultaneously easier and harder, as someone who has inverted several Casio watches.
Русский?