Re: Bought these (retro) hardware today

Posted on 2021-11-28, 12:12

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Then this happened: https://i.imgur.com/YT018zw.jpg This may not help, but since the errors are happening on the blockmove test... I had a problem with motherboard+sdram failing with radomish errors at radom addresses, but only on Blockmove and Mod20 tests when testing the whole stick. Never had an …

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Re: Early P5 + P54C (Socket 4 + Socket 5) mainboard

Posted on 2021-11-27, 20:57

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Need to find this datasheet... I can't find a datasheet, but did find a reference, and an output table for the CH9007b on page 23 here: https://core.ac.uk/download/pdf/4405047.pdf Maybe JP28 is frequency selector? Oh, and the RTC is probably in the 206: http://bitsavers.trailing-edge.com/components …

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Re: Computer won't post, Asus A7V + Athlon 1100

Posted on 2021-11-27, 20:39

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What brand are the capacitors? It's age puts it well inside the plague era, and as Weedeewee said they can fail and still look ok.

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Re: Test and troubleshoot PC@LIVE motherboards

Posted on 2021-11-27, 20:29

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Good work lifting the pin, shame the short is still there, that seemed very likely it was the problem. So that means it's back to removing and testing any component that's connected to both 1.5V and Gnd. I'd go back to checking the ceramic capacitors, although you mentioned about a couple of diodes …

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Re: Does anyone here have the Radeon 3850 agp schematics diagram?

Posted on 2021-11-27, 19:33

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is this the datasheet: http://mega-avr.net/file/NFO-BAZA%20ELEMENTOV/aod412.pdf

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Re: Chicony CH-498B voltage regulator mod help.

Posted on 2021-11-26, 22:15

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, thanks for doing that, I've corrected my diagram based on your measurements, and it now makes sense. So I'm not sure why you had the wrong voltage. Could you put it back together, but leave the 5V-3V jumpers off and put JP8 on the first position? Then measure the resistance (put the probes on …

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Re: Test and troubleshoot PC@LIVE motherboards

Posted on 2021-11-26, 20:21

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

the first PIN (it should be A1), I can see the tab that ended up at the bottom and I would say that it touches the PIN B1, unfortunately it must have bent by inserting the CPU, I hope that this problem is not subsequent to the MB problem, and that by bringing the tab back up (in the right position …

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Re: BP6 modifications for dual Coppermine.

Posted on 2021-11-26, 09:48

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are some pictures on the wayback: https://web.archive.org/web/20031006012141/ht … de=article&k=17

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Re: Chicony CH-498B voltage regulator mod help.

Posted on 2021-11-25, 22:31

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, the resistor have the values you said, I've tested then looking for the ones that read close to the desired values. Measuring the resistance on those pins results in a weird reading for me, it starts low, around 70k and increases slowly in 0,1 increments and they don't reach the expected …

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Re: Power leap style interposers for over clocking

Posted on 2021-11-25, 17:34

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Looks like there were lots of variants for frequency generators. Couldn't find a datasheet for the IC Works W48C60-402G on your board, but did find the National Semiconductor CGS605 that claims to be compatible (also the IC Systems ICS9159-02 and the Cypress CY2254). As you say, it only supports 50, …

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Re: Chicony CH-498B voltage regulator mod help.

Posted on 2021-11-25, 15:49

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Only thing that really matters with soldering is if the joint is good. I don't know if it'd make life easier, but it should be ok to solder the resistors from the back of the board which might save having to work around the other components. Just on the resistors, from the colour bands it looks like …

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Re: Finding old Alienware M17X R2 F310J or W075J batteries

Posted on 2021-11-25, 12:05

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Where are you based? There seem to be a few W075J around, e.g. : https://www.laptopbatteryexpress.com/AlienWare-W075J-Battery-p/awa-7-m17xr4-w075j.htm and https://www.subtel.co.uk/Battery-for-Alienware-M17x-R3/R4-7XC9N-6600mAh-Spare-Battery-Replacement-924273.html?listtype=search&searchparam= …

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Re: Have you ever heard a bios beep code like this??

Posted on 2021-11-25, 11:31

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The extra beeps could be binary for 000001000 an address for where the error occured. I like that idea, except since there are 8 follow up beeps after the initial 1 long-3 short, I'd go with it being 0000 0101, with the short beep being 0 and the long beep being 1. So possibly, 1 long-3 short, …

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Re: Large fan for a 12 year old case.

Posted on 2021-11-25, 09:58

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

154mm square between fixing holes would make the diagonal about 218mm. Given the shape of the fan, 218mm will be a bit bigger than the diameter of the blades, so maybe a 200mm fan? Maybe the 230mm is the outside diagonal from one fixing to the other. Seems to fit with this: https://landing. …

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Re: Have you ever heard a bios beep code like this??

Posted on 2021-11-25, 09:48

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So that's a quick 1 long 3 short, followed by a slower 4 short - 1 long - 1 short - 1 long. More like 5 short - 1 long - 1 short - 1 long. One day, honest, I will learn to count. Although computers manage with only counting to 1. Still haven't managed to find beep codes for that particular BIOS …

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Re: Chicony CH-498B voltage regulator mod help.

Posted on 2021-11-24, 23:01

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

EN and IN should probably be shorted together so the output is always on. IN shouldn't be shorted to GND or there's a power supply short. There should be some resistance, although it'll be fairly low (5V to GND). A direct connection from one side of JP8 to ADJ doesn't immediately sound odd (although …

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Re: Have you ever heard a bios beep code like this??

Posted on 2021-11-24, 21:07

by

by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So that's a quick 1 long 3 short, followed by a slower 4 short - 1 long - 1 short - 1 long. Any idea what the BIOS is? [edit: In case it's any use, there are a couple of posts about a Rein 420 SLC here: https://www.vcfed.org/forum/forum/genres/pcs-and-clones/1206000-ai-electronics-pc16-ai-pc16-286- …

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Re: Short on motherboard's 3.3V rail

Posted on 2021-11-24, 17:15

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not a helpful answer, but it'll vary from board to board. On my KA7 the lowest resistance is on the output of the CPU voltage regulator with the CPU in place, 5.1 ohms. Make sure you take the resistance measurements with everything unplugged so you can know if the problem is with the motherboard. …

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Re: Test and troubleshoot PC@LIVE motherboards

Posted on 2021-11-24, 14:37

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, I've put together a rough composite of the various photos and have just realised that 1.5V will need to go to the northbridge. I've traced what I can see of the 1.5V line, and you can see the pins on the back of the Slot 1. B5&9 join together and go through a via, but I can't see if the trace …

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Re: Test and troubleshoot PC@LIVE motherboards

Posted on 2021-11-23, 22:02

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by snufkin

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today I made other progress on the search for the short on the 6ABX2V, I removed one of the two suspect SMDs (BC39), it was not easy but I managed to remove it without breaking the tracks, the adjacent BC40 one moved a little, but it does not represent one problem, it's just a little crooked. The …

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