VOGONS


First post, by StarquestMan

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I recently bought a Dell 466/L computer as a project and it has turned into quite the headache. I had been wanting to get a 486 computer to tinker around on and play some dos games on and thought it might be fun to find one from the year I was born, 1994. Well I found this computer and it appeared to have all the features I wanted and as a funny bonus I saw the manufacture date was the day I was born which was cool. That's about the last good thing about the computer so far.

It was sent from the same state I live in, just a few hours drive, but that didn't stop the faceplate from getting broke off in transit since it was poorly packed. I opened the case and the thing was filthy filthy dirty and I noticed lots of corrosion from mice. I looked at the motherboard and all the smd caps had leaked on the board. At first I thought It would clean up ok and the faceplate seemed repairable so I asked for a partial refund for the damages and decided to keep it instead of having to deal with sending it back. I thoroughly cleaned the board and replaced all the caps but still nothing on the display and no beep. I checked all the voltages on the AT power supply and all of them are good. Next I ordered a POST card to check for any codes etc. After several tries and getting very erratic results I realized I was being an idiot and had the card installed backwards. once I figured this out i put the card in right and 7 of the 8 leds were lit up with the one light out being the reset line which would light up briefly when the reset button was pushed. there is a pin header labeled J1 and a button labeled sw1 but the instructions are very poorly written and don't include any info on what these are for. when I plug in a ps2 keyboard (the computer has ps2 connectors for both a keyboard and mouse) the lights on the keyboard stay on and I can't get it to beep by pressing or holding any keys.

This thing must have had a soundblaster installed in it since it has a creative cd drive but no card to control it and two of the three ISA slots are missing the block off plates. Im wondering if the bios is configured for an external video card but this doesn't explain the lack of beeps coming from the pc speaker or the lights on the keyboard being stuck. plus I jumpered the bios reset pin and the vga pins are jumpered for on board video and ive tried it both ways. I noticed in just about all pictures of these 466 and 433 machines online that there is a video ram daughterboard installed which I wondered if it was necessary but I then noticed that the lettering on the board says its an upgrade so I guess this isn't my problem.

Any Ideas? there are lots of holes in my knowledge so don't be afraid to point out anything obvious that I may have missed!

Reply 1 of 7, by aha2940

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Maybe posting a high-resolution picture of the motherboard, and detailed pictures of the damage made by the leaking capacitors (if any) would help diagnose. Also, a picture of what you are getting on the diagnose card will be useful. Hope you can get it working 😀

Reply 3 of 7, by StarquestMan

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Wow thanks for the quick replies! here are some pictures. And yes the soldering looks crude, I did it with a $5 soldering iron with a ruined tip.

https://imgur.com/9OvQNgO
https://imgur.com/DEbd4L5
https://imgur.com/0NLCsCl
https://imgur.com/vkTEaF8
https://imgur.com/79mESqh
https://imgur.com/UFU3DRE
https://imgur.com/jskscwM

Reply 4 of 7, by Doornkaat

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Hey dude! After taking a look at the pictures and seeing the sheer amount of corrosion especially on IC legs I relly do not think there's any point in remote troubleshooting this board. One needs to be able to probe the ICs and solder connections and see wether they're working or not if they're that corroded.
I guess this is the manual for your card: http://dimm.me/wp-content/uploads/PC-Analyzer-manual.pdf? If I understand correctly all LEDs on the POST card indicate normal behaviour but you're not getting anything on the LED segment display? This can either mean the board does not initialise at all or you fried the card by plugging it in backwards. You can try the POST card in another ISA machine. If it works there you can at least know wether the card still works and can be used for troubleshooting this PC.
Sorry I don't have any more helpful insights but in this condition almost everything could be wrong with this motherboard. 🙁

Reply 5 of 7, by evasive

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Right. The idea of decoupling capacitors is to put them as close as possible to the component that needs short and fast amounts of electrical energy. If you solder them with leads that longs it isn't going to work well, if at all. I would not be surprised if you shorted out other components nearby too. I'm trying not to offend you, but better have this fixed by someone that has a proper soldering iron.

Reply 6 of 7, by pentiumspeed

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The mice has hantavirus, very dangerous. I once received a compaq in that state too and saved the parts and disposed of the chassis, then purchased another.

Priority one: Get commercial disinfectant that is specific to infectious stuff bottle and mix it up if label says and apply to everything, including boards then wash in very warm water with soap after, rinse with water, then final rinse with 99% alcohol to chase away water and help to evaporate easier. Floppy, hard drive Power supply can be replaced.

The mice has hantavirus, and other diseases very dangerous.

Cheers,

Great Northern aka Canada.

Reply 7 of 7, by radiounix

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Hey. I have the same card, and mine survived being plugged in backwards. Indeed, the manual indicates it shouldn't cause any harm. I agree the English is pretty rough, but it shouldn't be too hard to use. I forget what the switch does, but you won't need to use it to see the codes on the LED readout when the machine boots up.

One thought is whether you're getting an AT Power Good signal from the power supply. The motherboard won't start up without one, and will reboot or turn off if the power supply doesn't keep sending the signal. I don't have the card in front of me, does the POST card check for this?

Other thought is that the board is basically done for unless you want to scrub it with a toothbrush and chemicals to begin with. I really wouldn't expect it to work in such condition, regardless of the condition of the capacitors. Mouse pee is corrosive, and if the case is filthy and mice have had opportunity to be around it than the machine has probably spend decades in marginal, unheated storage like an unattached garage or shed. If this were an Apple II, Commodore PET, or other simple machine with schematics, and you were handy with a logic analyzer, I'd say go for it. But this machine could easily have multiple faults, including failed connection points and bad ICs. My impression is even if you get it to POST it will likely exhibit weird behavior.

Sorry this had to be your first foray.