Re: Re: Clock Battery No boot
By: Ogg to HusTler on Sun Jun 14 2020 08:55 am

...One suggestion was to replace the clock battery on the mother
board. So he spent the 6 bucks for the battery and it worked! The
machine boot right up and is working fine. Anyone ever have this
happen?

I had about two old pcs that behaved that way by virtue of a dead or undervolt onboard battery.

Well, I have one ole laptop I might check then. :P I thought it was surely the power supply (luckily a daughter board for thinkpads...); but before I go digging into another ThinkPad to pull that peice, I'm going to check the clock....

I remember when i was disassembling, that dam clock battery wouldn't unplug and I kinda yanked hard to get that sucker out of there. Since two of you described this situation, I hope to gosh that its just the battery. Don't think so, but I'll be posting a thank you to Hustler and you if so!!! :P

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paulie420 wrote to Ogg <=-

Re: Re: Clock Battery No boot
By: Ogg to HusTler on Sun Jun 14 2020 08:55 am

...One suggestion was to replace the clock battery on the mother
board. So he spent the 6 bucks for the battery and it worked! The
machine boot right up and is working fine. Anyone ever have this
happen?

I had about two old pcs that behaved that way by virtue of a dead or undervolt onboard battery.

Well, I have one ole laptop I might check then. :P I thought it was
surely the power supply (luckily a daughter board for thinkpads...);
but before I go digging into another ThinkPad to pull that peice, I'm going to check the clock....

I remember when i was disassembling, that dam clock battery wouldn't unplug and I kinda yanked hard to get that sucker out of there. Since
two of you described this situation, I hope to gosh that its just the battery. Don't think so, but I'll be posting a thank you to Hustler and you if so!!! :P

I have a 486 motherboard that won't start at all (thought it well beep if there is no RAM installed). No video. I've been told that perhaps its something as simple as the battery, which may be the case as I've tried changing the RAM, CPU, etc.

I take it though, that the board won't start up until a new battery is put in place? Or is removing the dead battery enough to get it started?


... Dennis Katsonis
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Dennisk wrote to paulie420 <=-

I have a 486 motherboard that won't start at all (thought it well
beep if there is no RAM installed). No video. I've been told
that perhaps its something as simple as the battery, which may be
the case as I've tried changing the RAM, CPU, etc.

I take it though, that the board won't start up until a new
battery is put in place? Or is removing the dead battery enough
to get it started?

It will likely need a new battery installed. That generation of
mainboard may have the very common (back then) Real Time Clock and
battery combo, often the Dallas DS1287 or DS12887. Can be a real
pain to desolder / resolder, but I've done it successfully.

You can get them on eBay, here: https://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1313.TR0.TRC0.Xds12887a&_nkw=ds12887a&_sacat=0&_from=R40



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Gamgee wrote to Dennisk <=-

Dennisk wrote to paulie420 <=-

I have a 486 motherboard that won't start at all (thought it well
beep if there is no RAM installed). No video. I've been told
that perhaps its something as simple as the battery, which may be
the case as I've tried changing the RAM, CPU, etc.

I take it though, that the board won't start up until a new
battery is put in place? Or is removing the dead battery enough
to get it started?

It will likely need a new battery installed. That generation of
mainboard may have the very common (back then) Real Time Clock and
battery combo, often the Dallas DS1287 or DS12887. Can be a real
pain to desolder / resolder, but I've done it successfully.

You can get them on eBay, here: https://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1313.TR0.TRC0.Xds 12887a&_nkw=ds12887a&_sacat=0&_from=R40

Thanks. I really only want the board working becuase it has an 8bit ISA slot. I want to get a CGA monitor working and all the other boards only have the 16bit ISA slots.

But I blew the powersupply because I absentmindedly connected the power to the motherboard incorrectly (ie, the black cables weren't in the middle).

Damn!

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Re: Re: Clock Battery No boot
By: Dennisk to paulie420 on Wed Jun 17 2020 08:57 pm

paulie420 wrote to Ogg <=-

Re: Re: Clock Battery No boot
By: Ogg to HusTler on Sun Jun 14 2020 08:55 am

...One suggestion was to replace the clock battery on the mother
board. So he spent the 6 bucks for the battery and it worked! The
machine boot right up and is working fine. Anyone ever have this
happen?

I had about two old pcs that behaved that way by virtue of a dead or undervolt onboard battery.

Well, I have one ole laptop I might check then. :P I thought it was surely the power supply (luckily a daughter board for thinkpads...); but before I go digging into another ThinkPad to pull that peice, I'm going to check the clock....

I remember when i was disassembling, that dam clock battery wouldn't unplug and I kinda yanked hard to get that sucker out of there. Since two of you described this situation, I hope to gosh that its just the battery. Don't think so, but I'll be posting a thank you to Hustler and you if so!!! :P

I have a 486 motherboard that won't start at all (thought it well beep if th is no RAM installed). No video. I've been told that perhaps its something simple as the battery, which may be the case as I've tried changing the RAM, CPU, etc.

I take it though, that the board won't start up until a new battery is put i place? Or is removing the dead battery enough to get it started?

... Dennis Katsonis

Yes and no. Sorry about the ambiguity. A bad cell could short out or
provide a bit of voltage that prevents the BIOs from being preserved or the settings are corrupted. Pulling a battery could clear those settings, allow for any capacitors or volatile memory to clear. You can also search for a clear cmos jumper on a board, which will short out settings so they could be reset. A new battery may be essential to maintaining or stabilizng CMOS settings.

---
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On 06-17-20 20:57, Dennisk wrote to paulie420 <=-

I take it though, that the board won't start up until a new battery is
put in place? Or is removing the dead battery enough to get it
started?

It might be worth trying to remove the dead battery first, and hopefully you'll get the usual errors of RTC not set and Setup restored to default. If that doesn't work, you'll have to do some more troubleshooting, including trying a new battery. If it does work after removing the battery, you will want a new one, to maintain settings and run the RTC.


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On 06-18-20 21:30, Dennisk wrote to Gamgee <=-

Thanks. I really only want the board working becuase it has an 8bit
ISA slot. I want to get a CGA monitor working and all the other boards only have the 16bit ISA slots.

Hmm, I recall plugging 8 bit cards into 16 bit slots.

But I blew the powersupply because I absentmindedly connected the power
to the motherboard incorrectly (ie, the black cables weren't in the middle).

BUGGER! Hopefully you haven't fried the board as well. :/


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Re: Re: Clock Battery No boot
By: Vk3jed to Dennisk on Fri Jun 19 2020 01:32 pm

Thanks. I really only want the board working becuase it has an 8bit
ISA slot. I want to get a CGA monitor working and all the other
boards only have the 16bit ISA slots.

Hmm, I recall plugging 8 bit cards into 16 bit slots.

Yes, an 8-bit card can work in a 16-bit ISA slot. I remember doing that a couple times. I even seem to remember some 16-bit ISA cards still having some limited functionality when plugged into an 8-bit ISA slot.

Later, VESA local bus came out, which was a 16-bit ISA slot with another slot behind it, and I don't think you had to fill all of that either.

Nightfox

On 06-18-20 22:58, Nightfox wrote to Vk3jed <=-

Hmm, I recall plugging 8 bit cards into 16 bit slots.

Yes, an 8-bit card can work in a 16-bit ISA slot. I remember doing
that a couple times. I even seem to remember some 16-bit ISA cards
still having some limited functionality when plugged into an 8-bit ISA slot.

Yeah, I recall some of those 8/16 bit cards. They weren't common, but did exist. And yeah I had a PC with a number of 8 bit cards - CGA, voicemail system, SB (original 8 bit).

Later, VESA local bus came out, which was a 16-bit ISA slot with
another slot behind it, and I don't think you had to fill all of that either.

Yeah, I remember those, though AGP seemed to quickly displace it for video.


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Re: Re: Clock Battery No boot
By: Vk3jed to Nightfox on Fri Jun 19 2020 06:00 pm

Later, VESA local bus came out, which was a 16-bit ISA slot with
another slot behind it, and I don't think you had to fill all of
that either.

Yeah, I remember those, though AGP seemed to quickly displace it for video.

I think PCI replaced VESA local bus quite a while before AGP came around.

Nightfox

Vk3jed wrote to Dennisk <=-

On 06-18-20 21:30, Dennisk wrote to Gamgee <=-

Thanks. I really only want the board working becuase it has an 8bit
ISA slot. I want to get a CGA monitor working and all the other boards only have the 16bit ISA slots.

Hmm, I recall plugging 8 bit cards into 16 bit slots.

But I blew the powersupply because I absentmindedly connected the power
to the motherboard incorrectly (ie, the black cables weren't in the middle).

BUGGER! Hopefully you haven't fried the board as well. :/

I'm hoping so too. I'll try a different PSU, but at the moment, I need to fix up my battery pack and ensure it delivers the correct voltage first. I suspect the boards will not resurrect itself.

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Nightfox wrote to Vk3jed <=-

Later, VESA local bus came out, which was a 16-bit ISA slot with
another slot behind it, and I don't think you had to fill all of that either.

I didn't think VLB was backwards-compatible, but that was a long time
ago.



... The inconsistency principle
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On 06-19-20 20:47, Dennisk wrote to Vk3jed <=-

I'm hoping so too. I'll try a different PSU, but at the moment, I need
to fix up my battery pack and ensure it delivers the correct voltage first. I suspect the boards will not resurrect itself.

You can only test and hope for the best.


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On 06-19-20 09:14, Nightfox wrote to Vk3jed <=-

I think PCI replaced VESA local bus quite a while before AGP came
around.

You may be right, I forget now. I didn't see too many systems with VLB.


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