Fixing a DALLAS Realtime Clock Chip

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Welcome to my first 'edited' video! That's right, I actually put effort into this steaming pile.
Today, I am showing how I repair a DALLAS Realtime Clock Chip. At least, how I've been doing it.
Just a small contribution to #DOScember! Please check out the other videos at:
• #DOScember 2020
My technique is a modified variant found here, thanks Tezza!:
www.classic-co...
P.S. While I see the potential using OpenShot, I kept running into bugs while using it. I ended up using a new computer just because my gaming laptop didn't have enough grunt to handle the might of this video. Crashes were constant. The title screens used throughout were meant to use a VGA 9x16 font, but apparently it got lost in translation somewhere. I did have the font installed locally. And finally, some of the volume settings, were not. I apologise for the audio problems, especially at the end. To OpenShot, thank you, for you are but my very first important step forward.

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6 окт 2024

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Комментарии : 40

@shamteal8614 2 года назад

I've given up buying DS12887A chips on ebay, none of them work so this fix is a blessing. Does it matter which side you work on as I'm sure I've seen other video's where they go in from the other side from which you do. Yours is without a doubt the best instruction so I'm going to follow your example.

@orinokonx01 2 года назад

I'm glad this method is an option for you! For the DS12887 and varients, the internal battery pins are on the side I modify, as the package itself contains a standard IC chip, with a few pins bent upwards into the upper section which contains the battery. My method literally is cutting into this part to expose the pins and disconnect the internal battery. The battery shouldn't have issues of leaking, btw, since it is completely encased in the epoxy. Some people take the extra step of completely removing the battery, but that requires more extreme measures for relatively little gain. Good luck, and let me know how you go!

@shamteal8614 2 года назад

@@orinokonx01 Thank you, will do.

@darthtripedacus1 2 года назад

I believe it was NecroWare who made a drop-in replacement for the Dallas RTC. It's worth looking into :). Nice work sir.

@Vokabre 3 года назад

"It's very simple": *a saw enters the shot*

@JJShidel 2 года назад

Had to fix this on my PentiumPro a while back. Surprisingly, the battery in there lasted about 24 years. Then, it started forgetting the Hard Drive. Change the setting in the BIOS, reboot, forgot again. Unfortunately, mine was soldiered to the motherboard. So, that was fun. Bought a replacement chip off eBay and put a in socket. Works great again. In a decade or so, I'll probably mod the chip. :-)

@egbront1506 Год назад

I had a surface mounted Dallas RTC in an old laptop. I didn't think of removing it and replacing with a socket so did this fix with the original battery in situ. Hated every minute of it, dremelling away in small bursts. Luckily it worked first time.

@therealjammit 3 года назад

I remember doing something like this when those Dallas chips started going bad. I went manic though. I would Dremel through the top of the chip until I got to the battery. I would just crater the top to get the battery out. I would then solder wires to the needed pins, epoxy over it to make it mechanically stable, and run the wires to a "AA" battery holder zip tied to the case.

@orinokonx01 3 года назад

Sounds like the perfect way to fully electronically future proof the chip! I've wanted to try that myself!

@davidw.2467 3 года назад

It is better to drill than to saw, and all is needed is to drill one hole at the + terminal of the battery. The - terminal is connected to the GND pin of the package and can be soldered externally. Drilling also minimizes damage to the shell and possible injuries to your hand. You could drill thru the internal connector to cut the connection.

@orinokonx01 3 года назад

You're totally right, of course. I don't own a drill, and I suspect that you'd probably be better off with a drill press, even a small one. That way you could brace the RTC IC in a vise below the drill head. Less walking... Having said all that, there are maaaaany different ways to approach this fix. My way is something that works for me.

@jdaracena 3 года назад

Good Job!!! It is plenty of inspiration.

@DocBain1 Год назад

I cut the top cover off around the battery and replaced the battery inside. It's not any harder and no soldering required.

@georgemaragos2378 3 года назад

Hi - i totally hate these chips I have bought 4 or 5 "refurbished" ( haha yeah sure ) from ebay and none worked - i gave 2 to one person and 2 t o another who are handy with soldering iron and basically none worked I did have a feeling the battery is shorted and the 3 volts from the penlight or cr2032 is shorting out - mu multimeter says it is ok but that is at the exposed terminals who knows what is going on inside the dallas chip Finally i purchased my last one and it worked - but it will have limited time left as they are good for 10-15 years and i dont recall the date code on the chip Good to see it worked for you - i just think it is so stupid to have the cmos in with the battery - well so far some more life for my pentium 100 Regards George

@orinokonx01 3 года назад

Hi! By 'refurbished', were they modified in a similar way to this video? Yeah definitely sounds like the internal battery has not been disconnected! Never a good sign. What a pity!! I suppose they would be fixable... And yes, it is a very stupid design!

@georgemaragos2378 3 года назад

@@orinokonx01 Hi, No its the "other ebay refurbished " that means wiped with a tissue or removed from machine. I should fire up my P100 for nostalgia for doscember before it become january

@orinokonx01 3 года назад

Ah yeah that kind of 'refurbished' 😂 Definitely should fire up the P100! Even if it's just playing a screensaver, or a game demo or the like. A digital fireplace...

@georgemaragos2378 3 года назад

@MrDKShadow Hi - thank you for that information, i have copy and pasted your comments and links into my pc-hardware.txt file that i keep for all of my machines , it contains specs, add on card and version s of drivers etc, each machine has its own folder, very old machine have a nortons ghost image, newer ones acronis image Thanks George

@DrDavesDiversions 3 года назад

Nice hack! tnx! 20:00 Is it safe to leave the old battery in there? If it can't be removed from the package without destroying the RTC, do you think it might be best to epoxy over the holes made in the package so it won't leak onto the motherboard, if it ever leaks.

@orinokonx01 3 года назад

Hi! The small battery is epoxied completely within the plastic case on top of the chip. While there is slight concern about these batteries leaking, they appear to be more stable than the 'barrel' batteries found on many boards, 486 and prior. Ultimately, yes, if I had a Dremel and wanted to completely repair the chip, removing the old one entirely would be the best option. The replacement battery and it's holder can still be positioned above the chip the same way, and soldered etc. This video was more of a 'suddenly stuck with a dead DALLAS chip, what do I do?' solutions. For the record, I've been modifying them this exact way for many years, and ive not seen one leak, the potted nature of the package just doesn't allow for it...

@DrDavesDiversions 3 года назад

@@orinokonx01 Nice - I have no experience with the Dallas DIP. Tnx again for sharing this - I like the creativity!

@IBM_Museum 3 года назад

@@orinokonx01: You have recognized the Dremel (TM) as a possible method - it is so easy with one: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YA8bc5n0LOI.html I grove the slots with a Dremel (TM), but I don't try to pry out any connections afterward. The negative lead (leading to the top of the chip - the internal battery is negative up) is easier to disconnect by drilling in at the top of that 'channel' that was grooved - but I am more familiar working with the Dallas modules (other brands can invert the battery and chip). Use a multimeter to test (the old battery will still have a very low charge) that it is really disconnected. I solder leads (using good flux and solder, with a small iron) to attach my wiring to the chip - but never solder to a lithium battery directly.

@squirlmy 3 года назад

@@IBM_Museum Pin 12 (on the opposite side) is GND so that can be soldered to directly instead of making a second hole and connection to GND there. At least on Dallas. I think Benchmarq BQ3287 and BQ4287 are still being made, but they have "extra" pins that must be clipped.

@IBM_Museum 3 года назад

@1:45 - Are you going to show that PS/2? - It is important to note that the several PS/2s with a Dallas module (Model 25 286, Model 30 286, Model 35SX, 40SX, 53SLC2, 55SX, 55 [486]LS, and 65SX) are at risk of not working with certain "Y2K-fixed" replacement modules - IBM remapped the "Century Byte" location to 37h instead of offset 32h: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-CyoD3ScvhlM.html

@orinokonx01 3 года назад

Hi! Yep! It definitely will be in a future video! That and my PS/1 2121! I did not know that about the Dallas module on those machines. Admittedly, the PS/2 (Model 40SX) has had its Dallas chip modified already. Might have been the first one I did, actually... I'll need to check out the part number...

@jeremiefaucher-goulet3365 3 года назад

Each time I see such a fix, I'm worried that the old internal battery inside might leak over time. Is it worth doing, when you can buy reproduction/replacement of the old Dallas chip? In any case, great video :)

@orinokonx01 3 года назад

My understanding is that there are no *new* Dallas chips being made, so any replacement part you buy still runs the risk of having a dead, or near dead battery. The existing coin cell is still sealed, potted inside the plastic cap, and coin cells tend to be far more stable than the typical Varta-esc batteries. The best solution would be to Dremel the battery out completely, and replace it in a similar fashion to this video... Might be a good follow up video, eh? 😁

@jeremiefaucher-goulet3365 3 года назад

@@orinokonx01 Wish I remember which RU-vidr showed this but apparently there exist a drop-in replacement that I saw being used. Yeah, it's sealed... I just wonder how much you can trust that seal. But sure, without a replacement, what you are doing here makes complete sense 👍

@squirlmy 3 года назад

@@jeremiefaucher-goulet3365 you have to understand the seal was madeis not just for safety, but protecting intellectual property!! There were indeed two brands, Odin and Benchmarq that were closely matched to Dallas, but certainly Dallas versions are quite solid!!! Also the actual battery is very small, not much bigger than thick cardboard, there's very little inside to leak. While your concerns make sense in the abstract, once a unit is dissembled its clear there's no need for concern.

@jeremiefaucher-goulet3365 3 года назад

@@squirlmy I didn't think there was that much intellectual property to protect with a small battery, RTC circuit and a crystal oscillator. I was convinced the only reason for such packaging was convenience and ease of use in design and manufacturing. As for leakage protection? Yeah, I doubt very much the package was designed with that in mind. Thanks for your input. Indeed I haven't tried opening one thus far. It's indeed possible that my worries would disappear if I did. That's why I was asking that question originally ;)

@danmark1966 2 года назад

@@orinokonx01 You can still buy them, we use them for repairing Troxler nuclear gauges. The new one are made in the Phillipines.

@nR-kv7xo Год назад

LOL i am fixing the SAME motherboard but it’s branded nec. I replaced battery but keeps saying RTC error and “not working”, does not tell time (before said battery error as well) the benchmark replaced with a dallas. Any suggestions?

@orinokonx01 Год назад

Hi! Yeah they can be tricky little buggers. Are you replacing the RTC with another from a different manufacturer? Make sure the part numbers are correct and they are compatible. There are different RTCs with different internal memory sizes and some motherboards prefer (or rather, expect) a RTC RAM size. It's part of why this hacksaw mod is useful. I believe the IBM PS/2 line can be particularly picky about this. I actually didn't get back to that board. I really should... Let me know how you go!

@MichaelJantzen42 3 года назад

Excellent repair - would it also be possible to use a milling device to essentially etch away the top layers and then just cut the battery out?

@orinokonx01 3 года назад

Yeah definitely! I'm thinking of making a follow up video showing how to do it by Dremel, and removing the old battery entirely. Never done it before, so it'll be a bit of a learning experience!

@waleedattia7014 2 года назад

Please help me with dallas DS1225AB-150IND can i replace this dallas without reprogramming the new dallas? too can i replace this dallas by DS1225AD-150?