On 12/1/2014 7:24 PM, Tom Miller wrote:> > "amdx" <nojunk@knology.net> wrote in message > news:m5j31c$g0a$1@dont-email.me... >> On 12/1/2014 6:51 PM, amdx wrote: >>> Well I've received my M48T86PC1 Cmos Clock Lithium Battery as a gift >>> from China, according to the custom declaration. >>> It is an ST microelectronics part, my concern is the manufacturing >>> date. >>> The Chip is labeled as below, >>> >>> M48T86PC1 >>> Real-Time Clock >>> Contains Lithium Cell >>> 990SN VH >>> MYS 99 1033 >>> WO723Y >>> >>> I hate seeing all the 99's, any one know how to read a date code >>> for ST microelectronics. >>> >>> Another route, any chance I could measure the battery voltage? >>> The pinout is here but I don't know if the battery voltage is present on >>> any pin. >>> http://www.datasheetarchive.com/dlmain/Datasheets-31/DSA-600395.pdf >>> >>> I wish I would have done a little more research before ordering this >>> chip, I'm now finding a replacement chip DS12887. With chips available >>> from Mouser and Digikey, so I expect recent manufacture. >>> >>> Maybe I'll be lucky and this chip will be found to be recent >>> manufacture. >>> I only want to replace the chip once on the motherboard, a second time >>> might be pressing my luck. I'll order a second newer chip if it seems >>> appropriate. >>> >>> Your help appreciated, Mikek >>> >> >> I measured 0.0V between pin 12 and pin 24. FWIW. >> Mikek > > I would say it is the 33rd week of 2010. > > You will not be able to measure the battery, there is an isolation diode > (actually a power management chip) that kills the chip select line when > Vcc drops below 4.5 volts. > > Also, you might wish to install a good quality machined pin socket to > make the next change easier. > >Thanks for the idea about the socket. I put the new Real-Time Clock, Lithium cell into the computer with the socket that I installed. When I fired it up, I still get the low cmos battery indication andI can't get out of the bios set up. When I do, it just reboots and tells me to press F1 and I'm back in bios. I'm letting it run for a while, maybe the battery will take a charge, I did set the clock and it runs, but it lost the time when I rebooted. Anything I should do before I order a new battery? Mikek
Cmos Battery/Clock
Started by ●December 1, 2014
Reply by ●December 2, 20142014-12-02
Reply by ●December 2, 20142014-12-02
"amdx" <nojunk@knology.net> wrote in message news:m5l5lt$i8i$1@dont-email.me...> On 12/1/2014 7:24 PM, Tom Miller wrote: >> >> "amdx" <nojunk@knology.net> wrote in message >> news:m5j31c$g0a$1@dont-email.me... >>> On 12/1/2014 6:51 PM, amdx wrote: >>>> Well I've received my M48T86PC1 Cmos Clock Lithium Battery as a gift >>>> from China, according to the custom declaration. >>>> It is an ST microelectronics part, my concern is the manufacturing >>>> date. >>>> The Chip is labeled as below, >>>> >>>> M48T86PC1 >>>> Real-Time Clock >>>> Contains Lithium Cell >>>> 990SN VH >>>> MYS 99 1033 >>>> WO723Y >>>> >>>> I hate seeing all the 99's, any one know how to read a date code >>>> for ST microelectronics. >>>> >>>> Another route, any chance I could measure the battery voltage? >>>> The pinout is here but I don't know if the battery voltage is present >>>> on >>>> any pin. >>>> http://www.datasheetarchive.com/dlmain/Datasheets-31/DSA-600395.pdf >>>> >>>> I wish I would have done a little more research before ordering this >>>> chip, I'm now finding a replacement chip DS12887. With chips available >>>> from Mouser and Digikey, so I expect recent manufacture. >>>> >>>> Maybe I'll be lucky and this chip will be found to be recent >>>> manufacture. >>>> I only want to replace the chip once on the motherboard, a second >>>> time >>>> might be pressing my luck. I'll order a second newer chip if it seems >>>> appropriate. >>>> >>>> Your help appreciated, Mikek >>>> >>> >>> I measured 0.0V between pin 12 and pin 24. FWIW. >>> Mikek >> >> I would say it is the 33rd week of 2010. >> >> You will not be able to measure the battery, there is an isolation diode >> (actually a power management chip) that kills the chip select line when >> Vcc drops below 4.5 volts. >> >> Also, you might wish to install a good quality machined pin socket to >> make the next change easier. >> >> > Thanks for the idea about the socket. > I put the new Real-Time Clock, Lithium cell into the computer with the > socket that I installed. When I fired it up, I still get the low cmos > battery indication andI can't get out of the bios set up. When I do, > it just reboots and tells me to press F1 and I'm back in bios. > I'm letting it run for a while, maybe the battery will take a charge, > I did set the clock and it runs, but it lost the time when I rebooted. > Anything I should do before I order a new battery? > Mikek >Maybe the date code is for 2003 after all? Or it is just a bad chip or a board problem. With it running, what is the supply voltage on pin 24?
Reply by ●December 2, 20142014-12-02
On 12/2/2014 4:19 PM, Tom Miller wrote:> > "amdx" <nojunk@knology.net> wrote in message > news:m5l5lt$i8i$1@dont-email.me... >> On 12/1/2014 7:24 PM, Tom Miller wrote: >>> >>> "amdx" <nojunk@knology.net> wrote in message >>> news:m5j31c$g0a$1@dont-email.me... >>>> On 12/1/2014 6:51 PM, amdx wrote: >>>>> Well I've received my M48T86PC1 Cmos Clock Lithium Battery as a gift >>>>> from China, according to the custom declaration. >>>>> It is an ST microelectronics part, my concern is the manufacturing >>>>> date. >>>>> The Chip is labeled as below, >>>>> >>>>> M48T86PC1 >>>>> Real-Time Clock >>>>> Contains Lithium Cell >>>>> 990SN VH >>>>> MYS 99 1033 >>>>> WO723Y >>>>> >>>>> I hate seeing all the 99's, any one know how to read a date code >>>>> for ST microelectronics. >>>>> >>>>> Another route, any chance I could measure the battery voltage? >>>>> The pinout is here but I don't know if the battery voltage is >>>>> present on >>>>> any pin. >>>>> http://www.datasheetarchive.com/dlmain/Datasheets-31/DSA-600395.pdf >>>>> >>>>> I wish I would have done a little more research before ordering this >>>>> chip, I'm now finding a replacement chip DS12887. With chips available >>>>> from Mouser and Digikey, so I expect recent manufacture. >>>>> >>>>> Maybe I'll be lucky and this chip will be found to be recent >>>>> manufacture. >>>>> I only want to replace the chip once on the motherboard, a second >>>>> time >>>>> might be pressing my luck. I'll order a second newer chip if it seems >>>>> appropriate. >>>>> >>>>> Your help appreciated, Mikek >>>>> >>>> >>>> I measured 0.0V between pin 12 and pin 24. FWIW. >>>> Mikek >>> >>> I would say it is the 33rd week of 2010. >>> >>> You will not be able to measure the battery, there is an isolation diode >>> (actually a power management chip) that kills the chip select line when >>> Vcc drops below 4.5 volts. >>> >>> Also, you might wish to install a good quality machined pin socket to >>> make the next change easier. >>> >>> >> Thanks for the idea about the socket. >> I put the new Real-Time Clock, Lithium cell into the computer with the >> socket that I installed. When I fired it up, I still get the low cmos >> battery indication andI can't get out of the bios set up. When I do, >> it just reboots and tells me to press F1 and I'm back in bios. >> I'm letting it run for a while, maybe the battery will take a charge, >> I did set the clock and it runs, but it lost the time when I rebooted. >> Anything I should do before I order a new battery? >> Mikek >> > > Maybe the date code is for 2003 after all? Or it is just a bad chip or a > board problem. With it running, what is the supply voltage on pin 24? > >I have 4.97V on pin 24. I noted, if I turn of the computer for 30 seconds it keeps the time in bios, if I turn it off for 2 minutes it loses the time. This is after a 2-1/2 hr power on time. Here's some screen shots of the bios I'm working in. I am over my knowledge level here, I suspect I need to tell it to boot on the HD. So far I have just left it in auto, but I see a section where I can pick Hard Drive Type by size etc. see last link showing that window. http://s395.photobucket.com/user/Qmavam/media/P1010121_zps2489bea4.jpg.html http://s395.photobucket.com/user/Qmavam/media/P1010125_zps348d3789.jpg.html http://s395.photobucket.com/user/Qmavam/media/P1010126_zps303c2b1f.jpg.html http://s395.photobucket.com/user/Qmavam/media/P1010130_zps7ded99c2.jpg.html If the memory can keep time, I would think I could boot, but lose everything when I shut down. So, something else I need to do? At the least, I think I need to order another Clock/Lithium Battery. What do you think? Thanks, Mikek
Reply by ●December 2, 20142014-12-02
On 12/2/2014 4:05 PM, amdx wrote:> If the memory can keep time, I would think I could boot, but lose everything > when I shut down. So, something else I need to do? > At the least, I think I need to order another Clock/Lithium Battery. > What do you think?It appears that your "nonvolatile" aspect ... isn't. The "chip" is reporting the low battery condition so even if *it* was in error, you'd still be stuck replacing the entire module. As I said in a previous thread (along with some photos), the battery connection to the "silicon" can be exposed with a Dremel (TmReg). You can then measure the actual cell voltage (with a very high impedance DVM, *not* a generic VOM!). Once you verify that it is dead/dying, you can clip the connection to the cell and piggyback a CR2032 (or similar). In the past, I've used small (AAA) NiCd's as I had a boatload of them.
Reply by ●December 2, 20142014-12-02
On 12/2/2014 5:58 AM, amdx wrote:> I'm not going to tear up this maybe new? 2003 or 2013 chip just to measure > the battery.You don't need to destroy the chip to expose the battery connection. Dig up my previous post for URL to similar photos.
Reply by ●December 2, 20142014-12-02
On 12/2/2014 5:14 PM, Don Y wrote:> On 12/2/2014 5:58 AM, amdx wrote: >> I'm not going to tear up this maybe new? 2003 or 2013 chip just to >> measure >> the battery. > > You don't need to destroy the chip to expose the battery connection. > > Dig up my previous post for URL to similar photos.I went back and found the link you posted, I don't think my IC is the same as in your link. http://www.squirrel.com/squirrel/sun-nvram-hostid.faq.html#attach I have the cover cut off the top. It exposed two more boxes inside. There is not a dimple in those. This did not come apart easy, I cut the cover and pried off some of it, the rest does not want to come off. Thanks, Mikek
Reply by ●December 3, 20142014-12-03
On 2014-12-02, amdx <nojunk@knology.net> wrote:> On 12/1/2014 11:53 PM, Jasen Betts wrote: >> On 2014-12-02, amdx <nojunk@knology.net> wrote: >> >>> Another route, any chance I could measure the battery voltage? >> >> Absolutely, I told you how last month. >> > You said, > "It's a regular 0.3" PDIP CMOS RTC chip potted with a lithium battery, > they can be opened and the chip connected to a replacable battery." > > I tore up as much of the cover as I could and have not got to the > battery. It is fitted between two PCI connectors with very little room > to maneuver. > > I'm not going to tear up this maybe new? 2003 or 2013 chip just to > measure the battery. > Thanks, Mikekjust drill two small holes to reach the power pins and probe with some fine wire, -- umop apisdn
Reply by ●December 3, 20142014-12-03
On 12/3/2014 4:29 AM, Jasen Betts wrote:> On 2014-12-02, amdx <nojunk@knology.net> wrote: >> On 12/1/2014 11:53 PM, Jasen Betts wrote: >>> On 2014-12-02, amdx <nojunk@knology.net> wrote: >>> >>>> Another route, any chance I could measure the battery voltage? >>> >>> Absolutely, I told you how last month. >>> >> You said, >> "It's a regular 0.3" PDIP CMOS RTC chip potted with a lithium battery, >> they can be opened and the chip connected to a replacable battery." >> >> I tore up as much of the cover as I could and have not got to the >> battery. It is fitted between two PCI connectors with very little room >> to maneuver. >> >> I'm not going to tear up this maybe new? 2003 or 2013 chip just to >> measure the battery. >> Thanks, Mikek >> just drill two small holes to reach the power pins and probe with some > fine wire,I only what to come off as just a little bit of a smart ass. "just drill two small holes" about what size drill bit? How deep do I need to drill? "to reach the power pins" Does it matter where I drill these "small" holes on this 3/4" x 1-1/4" chip so that I can probe the power pins? Here's diagram showing where to cut on a DS1287 Clock chip. http://www.mcamafia.de/mcapage0/jpg/ds1287rw.gif I don't know that it is the same chip. it doesn't use all the pins, But I'll grind on the chip I have out and see what I run into. Mikek
Reply by ●December 3, 20142014-12-03
On 12/2/2014 5:07 PM, amdx wrote:> On 12/2/2014 5:14 PM, Don Y wrote: >> On 12/2/2014 5:58 AM, amdx wrote: >>> I'm not going to tear up this maybe new? 2003 or 2013 chip just to >>> measure >>> the battery. >> >> You don't need to destroy the chip to expose the battery connection. >> >> Dig up my previous post for URL to similar photos. > > I went back and found the link you posted, I don't think my IC is > the same as in your link.Sorry, my bad. Try this: <http://www.hardwaresecrets.com/article/Replacing-the-Motherboard-Battery/81/3> (after verifying that it does, in fact, pertain to the device(s) you have in front of you)> I have the cover cut off the top. It exposed two more boxes inside. > There is not a dimple in those. This did not come apart easy, I cut the cover > and pried off some of it, the rest does not want to come off.
Reply by ●December 4, 20142014-12-04
On 12/3/2014 12:49 PM, Don Y wrote:> On 12/2/2014 5:07 PM, amdx wrote: >> On 12/2/2014 5:14 PM, Don Y wrote: >>> On 12/2/2014 5:58 AM, amdx wrote: >>>> I'm not going to tear up this maybe new? 2003 or 2013 chip just to >>>> measure >>>> the battery. >>> >>> You don't need to destroy the chip to expose the battery connection. >>> >>> Dig up my previous post for URL to similar photos. >> >> I went back and found the link you posted, I don't think my IC is >> the same as in your link. > > Sorry, my bad. > > Try this: > > <http://www.hardwaresecrets.com/article/Replacing-the-Motherboard-Battery/81/3> > > > (after verifying that it does, in fact, pertain to the device(s) you have > in front of you) > >> I have the cover cut off the top. It exposed two more boxes inside. >> There is not a dimple in those. This did not come apart easy, I cut >> the cover >> and pried off some of it, the rest does not want to come off. >Next question would be, is the Dallas chip built the same way as the ST microelectronics chip? ie. do I grind on pin 16 and 20. I'll give it a try,If I can measure a voltage near 3v, I'm probably OK. Mikek
