ASUS P55T2P4 - Drained Dallas DS12B887 Battery
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- เผยแพร่เมื่อ 3 ต.ค. 2024
- The CMOS battery reached the end of its life on my ASUS P55T2P4. The unfortunate side-effect is that I can no longer save any BIOS settings. On boot, the motherboard automatically restores the BIOS defaults. Date, Time, USB functionality, and more are either wrongly configured or disabled. Time to replace the the DALLAS DS12B887, a resident of this motherboard for more than 25 years, with a working unit.
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NecroWare made a modern replacement. It's a great open source retro project.
Defective by design. Planned obsolescence in its full glory.
The lifespan of those modules was quite long (~25 years?). Maybe nobody thought there will be a retro community for those old boards. But yes, they will fail after a certain period. However, I prefer those modules over the leaky barrel batteries that destroy motherboards!
@@bitsundboltsI prefer a socketed Dallas in the first place!
I enjoyed that, that was pretty informative and fun, I never knew that something as simple as replacing a CMOS battery was so complicated in the past
Yes, it is quite the challenge to get those chips off the boards. But those Dallas chips are much better compared to the barrel batteries that used to leak and destroy many boards (286, 386, and 486 boards!). But yes, they could have just soldered a socked on the board to make the replacement easier! Glad you enjoyed the video!
Totally relate to this. Had to replace a few of these in rather spendy scientific gear. Were rather hard to find working and so did a similar gutting operation on them and replaced the battery with a cr2032 and holder soldered and epoxied to the top. ❤
NecroWare made a modern replacement. Really cool series
Fixing the RTC will be expensive: new soldering iron, solder sucking machine, flux, soldering melty wire, socket for the chip.
And seeing as I need all those things it goes without saying that my soldering technique suck.
I found out they still make the chip but you still need to de-solder the old one and re-solder the new one.
Thanks Asus for penny pinching when making this board.
That is exactly the expectation that I have when ordering Dallas RTC modules from China: most or all of them will be dead. I order them with the intention of modding them to add an external battery. The latest batch I got a few days ago was unexpectedly good: only 3 of the 5 had a dead battery. Even so, there can't be much life left in the 2 still good ones, so I'll be modding all 5 of them for future use.
True! If you want the original RTC, there will be those issues. There is a RTC clone from a TH-camr I follow. Google: RTC Necroware.
This may be the best alternative to the modules from China!
I have the same issue. Thank you for the quality of your work !
Thank you. Good luck with the replacement
I have the same battery. I looked up the spec sheet and it says it should be 5v 7mA, how is it that the cell you cut out of it is a 3v? I saw a video of someone else sanding into the side of it and soldering a coin cell holder into it, should I use a 3v like the one you took out or follow the sheet and try to find a 5v?
Wow, another useful video, keep it up...
1:39 HAHAHAHAHA those Chinese communists are such scammers. 🤣🤣🤣
Please update this video with necroware coin cell battery rtc replacement
Where did you get those sockets from? I want to make sure I get the right size
I ordered mine from AliExpress: 24 Pin wide
I got an Asus P2B standby supports ECC Sdram - and i got 2x512 for it - hmmm...
I do have dallas to cr battery replacements brand new search online,I use them on all ofmy p1 mobos
why not jumper a battery holder to the pins of the battery and use a cr2032
Yes, you can do that, but I do not like the extra height I get from battery holder. I know there are nice community made modules that are made really well, but I may reuse the original RTC modules to do the same thing.
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?
I am no expert, but I do not think you can replace DS12B887 with DS1225AB:
DS12B887: www.elnec.com/en/device/Dallas/DS12B887/
DS1225AB: www.elnec.com/en/device/Dallas/DS1225AB/
DS1225AB seems to be a NVRAM (8kx8) module , while DS12B887 is the Real-time Clock. I may be wrong, but I would stick with what was originally installed. If you have an old module, you can modify it with a new button cell battery. There are some guides and I may also make a video once I get the time.
Actually dip packages can be attached on sockets too but some Taiwanese cheap ass engineer decided not to include a socket in order to spare some cents and make the m/b battery module non user replaceable. Thus you need soldering skills or to pay for such skills if the rtc battery goes south. Well done asus hotshots...
Replaced my Dallas twice on a T2P4, stopped working after a few week every time. Maybe its time to trash it...
don't chuck the board, get the necroware or glitchworks module and use that on there. if you did chuck it. :(
@@pentiummmx2294 maybe I'll give it another shot, but I wouldn't rule out some other damage to the board.
@@wernerviehhauser94 Those "new" Dallas chips that you get from China were manufactured over 20 years ago, the battery drains even if they haven't been used. It's very easy to mod them to attach an external battery to them, which brings them back to life- and the battery can then be changed easily. There are many videos on youtube on how to do that. All you need is a rotary tool like a Dremel, a CR2032 battery holder, a couple of pieces of wire and a tiny bit of soldering. It takes me about 5 minutes to do the mod.
Are those batteries rechargeable 3v or are they just standard ones?
@@killerrf Dallas modules. Non rechargeable.
5:30 terrible work.no cut the pin socket. Pin pull up go out is better.
The best off is replace big socket
Your reply makes very little sense. Please write in clear full sentences and better grammar. Maybe you have something valuable to share, I can't tell because what you wrote is gibberish.
So, I could have done better. At the time when I replaced the RTC modules, I didn't have the right socket. I ordered the correct size now and will rectify my mistake. Thanks!
So annoying these chips even exist. Thankfully, don't think any of my retro hardware uses them, but I am sure at least a couple have batteries soldered on, which is worse, due to leakage potential.
I don't like those Dallas modules either. Especially when they are soldered on the board. But better than the leaky batteries that destroy traces. Lost a board to battery acid some time ago
I have a AOpen AP5C/P with the dallas soldered on. i was so pissed when i found out that it was like that. and it being AMIBIOS, it was stuck on "CMOS Battery state low RUN SETUP UTILITY Press F1 to resume"
It is frustrating when you cannot use the PC at all due to a drained CMOS battery. In the best case, assuming you have the time, tools, and skills, you are looking at a multi hour project. I guess manufacturers didn't consider their components being used 20 years into the future!
@@bitsundbolts a desoldering iron or a hot air station can work for removing the dallas.
I used a soldering iron and a suction tool. I do not know what kind of solder they used on the board, but it was quite difficult to get it off. The mass may be too much for a hot air station - not sure though. I just did not want to damage the board by applying too much heat. I think a gradual and slow approach may be best to get the Dallas chip off the board.
@@bitsundbolts i unfortunately managed to make my biostar mb-8500tac-a die when attempting to remove the dallas, it just stopped posting with -- -- on the post card. desoldering is hard. idk how my ecs p5vx-b worked after some time of soldering ps/2 ports on it. my ms-5120 died when i attempted that same mod. i used wick on the ecs and i used a desoldering gun on my ms-5120.
Oh dich gibt's auch noch ;) hast du ne E-Mail adddy ? Ich hab ein ähnliches Problem mit nem Board . Fotos kann ich dir schicken
Ja klar: bitsundbolts at gmail.com
Never realised those things where battery's lol.
Only after researching this became clear to me. I was surprised as well!
Ach ich bin doch kein Elektroniker :( welcher normale mensch kann denn sowas
Check Necroware's Dallas RTC replacement: github.com/necroware/nwX287
Yes, I have seen those. They would be the perfect replacement for the original RTCs
I've bought several and they are a great replacement.