RTC Battery Replacement - Dallas DS12887
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- Опубліковано 7 лют 2025
- Replacing the battery on a Dallas DS12887 Real Time Clock. This is the complete process, including fumbling and talking to myself.
Music: Local Forecast - Elevator, Kevin MacLeod
Great vid, best part is the music. Helps you chill while mucking about in these DS modules. I've had to budget the DS1216s in my old SGIs. Now I'll try the same with the DS12887 in my DEC Alpha. It's defo less accessible than the 1216.
The 1216 is a socket module piggy-backed by an SRAM, and there's no space in the SGI to accommodate the battery on top of the SRAM. Instead, I placed the battery on an unused connector pad on the PCB, soldering it to GND, then running only the V_Bat (+) lead to the 1216. Of course I had to disconnect the internal batteries first (the 1216 actually has 2). I suppose this could also be done with the 12887 if you don't wanna glue the battery on top or don't have the space.
Thanks for the video. I finished the intervention of my DS1887 chip. Battery was dead flat.Hope it will bring the PC back to life, it is stuck on the POST due to CMOS error.
Hello, very good modification a video, what problem did you have in your board for no battery ??… mi motherboard it’s dead… I think it’s real time clock battery problem.. do you have more information ?
It seems those Dallas Realtime batteries are still being manufactured and sold now. I saw price somewhat of $3-4 for a piece made in 2022.
I just wanna say THANKS! I revived an Asus P55T2P4 after watching this video. I'm so happy :-)
same job here...got to fix that boot sequence badly for OS installations
First q. You "cheated" and prepped the RTC to pull. If not pre loosened how do we pull it? Is it soldered? Do we have to unsolder it? Do we need one of those chip pullers? Get a screwdriver under the edge? I'm cleaning up after someone who killed the existing PC by doing what I guess you will do, Dremel in at the sides and attach an external 2032 battery case. (Not blaming or criticizing you!) So I have to figure out if he's killed the whole thing, or will a new RTC do it, or can I fix his RTC work, or what.
I was able to mod my own thanks to your guide. I have that same motherboard
Awesome!
Good tricks , good idea, thx, I will practice this on my Ga-686kx !
Спасибо. Заработал старый комп с этой доработкой! :)
good idea. However, I found that battery new on Ebay in China for $2, and $2 shipping. So as long as I can get them that cheap, I'll save that procedure for when that supply dries up. Which is bound to happen as less and less of these older motherboards are being used.
Blocking an ISA slot for no reason whatsoever. Great info on how to NOT do this, thanks.
I have the DS1397 for an old compaq 486 motherboard. It's a bit different but I think I can mod it now after watching this video.
Good information
I have the same CE strippers. I loved them as far as cheap tools go until some jerk cut mild steel with them.
well thanks for that.........gonna have a go as well on my Dimension XPS P75
I replace that chip on the mother board a few years ago. My CNC mill is a Cinncinatti Milacron with a PC based controller. 1995 vintage. I just replace another one of those chips on another board in the case. I get an error message on the screen saying "invalid Indirect pointer, The NAM server process has been requested by the WS to make a RT system name reference................." any clue what my fault is? I had dipp switches on the mother board to change but did not see any on the board that hold this Dallas chip.
I have a single board computer (x486) which controls a big piece of equipment. The board is called a CAT1070 from Diversified Technologies, and I cant find a replacement anywhere. Anyway, last week it stopped saving CMOS data, and now when I reboot I have to reenter all CMOS settings daily. Would replacing this clock/battery fix my issue?
I got you to 50 subs!
Great Job! How did you take the Dallas chip off the board is it soldered or just it pull out.
It was socketed
@@BrandonFreemanAwesome Mine is soldered. Is this something I can pay you do for me?
Wow, not only did they use an RTC with a built in battery, they also made the whole module impossible to replace. It shouldn't be too hard if you can do basic soldering though.
Good job bro...!!!!!!
I personally hate it when they use those rtc in computers. It's just much more wasteful than the standard built in clocks with replaceable batteries that also drive the cmos. But it must only be the really old boards that use those, right?
i really hate when the Dallas batteries are soldered to the board, they require extra work to replace them unlike the socketed ones.
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?
DS1225 is nonvolatile SRAM, which doesn't have a battery ... Which is what makes it nonvolatile. This RTC would not be interchangeable. You're going to need a direct replacement.
Why add battery ? is it more easy to change the component. Any reason for this ?
They no longer make the component. The ones on the market place are about 6 or 7 years old at a minimum. Not to mention a $1 battery is cheaper than a $20 component.
Hi, I have a DS12C887+ . I tried to do but this CI it not have the negative pin . I didn't find it. Please, help!!!
The + is the same pinout as the older version. It might have a thicker shell than the one that I had, but if you haven't hit silicon, you can keep digging.
Very good! Thanks
the process for DS12887A + and the same???
DS12887A seems to have the same pin-out, so I'd be willing to bet that it'd work.
please help .... I want to install the DS1642-150 batter
Have ich done it?
Cool.
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