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Re: Creating a bootable CompactFlash card. How to do it?

Posted on 2020-05-26, 08:57

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I found you need to delete all partitions on the cf card through disk management, create new partition and format it to fat16 with disk management. Then boot dos 6.22 floppy with a vmware, mount the cf as the hard drive, fdisk it and format again through the vmware. Formatting it through my computer …

Re: cmos shutdown register read/write error

Posted on 2020-05-25, 11:03

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I finely got a cmos replacement chip, cliped off the old and installed a new one and no change still 10 beeps on boot. I went as far as comparing resistance readings on the bios chip and cmos chip from a working version of this board to the faulty one and the readings are the same. This tells me the …

Re: Biostar MB-8433UUD-A External Battery Question

Posted on 2020-05-03, 10:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I socketed both mine, when I was pretty bad at soldering I spent hours with a solder sucker and a soldering iron sucking out the joints and eventually did it nearly damaging the board. Second time with improved skill and a proper desolder gun with a station took about 30 minutes. There is 1 or 2 …

Re: Biostar MB-8433UUD-A External Battery Question

Posted on 2020-05-03, 08:34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You would have to cut the RTC outer casing and cut the positive connection to its internal battery if you want to connect a external battery. I got 2 of these boards and I know access is very limited to the RTC from the top sitting between the isa and pci slots. Unfortunately desoldering the RTC is …

Re: cmos shutdown register read/write error

Posted on 2020-04-11, 08:40

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I was just poking around comparing resistance readings and I found something. One of the main lines one the faulty board gives me no reading to ground. On the working board it does give me a reading that slightly changes, this is ok because there is several tantalum caps on this main line. I have …

Re: cmos shutdown register read/write error

Posted on 2020-04-11, 05:35

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I compared resistance readings on the bios pins on good and bad motherboard, resistance is exact on each pin with ground. So it seems each pin from bios is connected to the same exact path on each bios, there goes my theory about a connection from the bios to cmos being broken. Thanx for the good …

Re: cmos shutdown register read/write error

Posted on 2020-04-11, 02:04

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This kind of gives me a idea, I can try to map which bios pins connect to which cmos pins on the working motherboard, pretty time expensive exercise but what are hobbies for

Re: cmos shutdown register read/write error

Posted on 2020-04-11, 01:38

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes I actually tried the physical bios chip from the good board, still 10 beeps but higher pitch, maybye they are different bios revisions? I also tried the keyboard controller chip don't know why because no logic behind it but since socketed why not, same results

cmos shutdown register read/write error

Posted on 2020-04-11, 01:09

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Im fixing a 486 board that had barrel battery acid leak. From no response on boot I am now getting 10 beeps which is a cmos error. I cleaned this board, fixed corrosion, removed alot of components resistors capacitors etc as there was too much corrosion on the vias. I even found a few cracked traces …

Re: Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-09, 06:00

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

LOL he would have to shape the leads to fit if radial too. I guess he'd better get used to pliers, then. not sure why you would need pliers for either, those wires are paper soft and legs on new caps are pretty long its a matter of sticking 1 wire through then bending the cap around to fit the …

Re: Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-08, 00:02

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

yeah it fit no problem new capacitors come with pretty long legs, that was not a issue. nothing blew up and multimeter shows 5v over one of the cap legs so its getting juice.

Re: Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-07, 05:54

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

From my research this is supposed to be a very stable capacitor, any reason can't use this one? https://i.ibb.co/FXFz5xQ/RC5490-100nf-50vdc-monolithic-capacitor-Image-Main-515.jpg 100nF 50VDC Monolithic Capacitor I guess you'd have to pass on it if you had an irresistible prejudice against pliers. …

Re: Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-06, 08:10

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I found my local shop has some monolithic capacitors in stock, I'll call them but who knows if they will be open during COVID-19 although half the shops are still open. From my research this is supposed to be a very stable capacitor, any reason can't use this one? https://i.ibb.co/FXFz5xQ/RC5490- …

Re: Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-05, 13:35

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This is how they look prior to removal, external battery power goes to them so im guessing 5v rating should be enough? ps maybye thats a 5ZZ if there is such a thing?

Re: Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-05, 12:55

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

all it says is 522 104, but I have another identical capacitor (they were both side by side) can I determine the voltage using a multimeter on the second capacitor I removed?

Re: Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-05, 11:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

ShovelKnight wrote on 2020-04-05, 11:48: If you can solder it to wherever this one was, then sure Great, thank you!

Re: Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-05, 11:47

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

could I get away with replacing it with a SMD 100nF capacitor?

Re: Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-05, 11:36

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

ShovelKnight wrote on 2020-04-05, 11:28: It's a 100 nF capacitor, and no, you can't solder it back thanx for the quick reply, time to look for a replacement then

Can I solder this ceramic component be soldered back together to fix?

Posted on 2020-04-05, 11:21

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am desoldering some components to clean corrosion and this ceramic part broke in half. Im it looks like a resistor it says 522 104 on it. Looks like a fat wire inside, could I solder it back? But that would change the resistance of I add more mass to it? https://i.ibb.co/Ptnnkpy/IMG-20200405- …

Re: Help with non booting OPTi-localbus motherboard

Posted on 2020-03-29, 11:38

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Could the cmos chip have anything to do with not keeping a precise time count?

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