VOGONS


First post, by ReeseRiverson

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Well, I need to try to fix this board some how some way so I can use it in the Packard Bell my uncle had given me. Because the original motherboard is pretty much shot from the battery acid. 😢

I've mentioned this about my working board somewhere here, and someone suggested it may have been a fuse... but here's my diagnosis of the problem when I kept screwing with it... my original Dell PS/2 based keyboard from 2004~2005 year would work while some others refused to work, the lights were fairly dim... it got to the point where I had to put pressure on the connector end of things to try to make it work, and it did at times. Though no matter or what, it always said keyboard error on the POST screen. I've tried soldering whole new PS/2 connectors onto this board, and even soldered wires directly in to hook to a PS/2 mouse bracket, using correct pin-out. That didn't work either. Heck, I've even went as far as fully bypassing, not using the PS/2's power connection, to feed the 5v connection of the external PS/2 header I wired power directly off the 5v rail of my PSU... THEN my keyboard lamps were bright like they should be, but still, nothing.

Only thing that sorta worked was when I had the PS/2 port in and held a certain pressure. 😵

So at the time I gave up and tossed the board back into storage. Though now I need the dang thing to work so I can restore that Packard Bell 486 system... it also is practically an upgrade with the Intel OverDrive chip and cache... and added VRAM it has.

Here's a close up of the area of the PS/2 ports...
IMG_3402.JPG

Now I practically have an ENTIRE parts board I can steal parts from... well, except the parts ruined by the battery acid. Which fortunately anything related to the keyboard I believe should be fine on the other one.

Both boards pictured:
IMG_3401.JPG

Isn't this just a heart breaking sight to see on the ruined board?
IMG_3392.JPG
IMG_3397.JPG

But yeah, parts board now. I hope.

Reply 1 of 3, by devius

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Did you test for continuity between the PS/2 port pins and whatever chip they're supposed to be connected to?

Reply 2 of 3, by ReeseRiverson

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devius wrote:

Did you test for continuity between the PS/2 port pins and whatever chip they're supposed to be connected to?

Yeah, I recall doing some testing, and I did get readings up to the ends of one of those chips... Only thing I'm not certain of is what those one chips are marked by "L1", "L2", and etc. I assume that "C" is for capacitors, "D" for diodes, and "R" is for resistors, but I'm pretty clueless on the "L" marked chips.

Also, I may try cleaning on the solder joints, going ahead and remove the wires, and transplant the PS/2 adapters over from the other board and try again. Then from there, begin my continuity test, from the PS/2 port itself onward.

Reply 3 of 3, by smeezekitty

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ReeseRiverson wrote:
devius wrote:

Did you test for continuity between the PS/2 port pins and whatever chip they're supposed to be connected to?

Yeah, I recall doing some testing, and I did get readings up to the ends of one of those chips... Only thing I'm not certain of is what those one chips are marked by "L1", "L2", and etc. I assume that "C" is for capacitors, "D" for diodes, and "R" is for resistors, but I'm pretty clueless on the "L" marked chips.

Also, I may try cleaning on the solder joints, going ahead and remove the wires, and transplant the PS/2 adapters over from the other board and try again. Then from there, begin my continuity test, from the PS/2 port itself onward.

L = inductor