Re: VLI-486sv2gx4 troubleshooting
Posted on 2021-06-13, 17:55
Cool! Glad you were able to fix it, it's a nice board.
Re: what will you do when your last hardware fails?
Posted on 2021-06-12, 05:41
I have spent some time acquiring skills and tools to perform repairs on my old hardware, and I think I have enough spares for the most important stuff in case it dies irrevocably. So I'm not really concerned about running out of retro hardware. What I've come to realize lately is how important CRT …
Re: VLI-486sv2gx4 troubleshooting
Posted on 2021-06-10, 06:34
Yeah, that sounds about right, tantalums on the -12V line (blue wire) are usually the first ones to pop. If you have a soldering iron, you can remove that shorted cap and try again, that cap should not be critical for the board to work. If that fixes the problem, then you can replace it with a new …
Re: VLI-486sv2gx4 troubleshooting
Posted on 2021-06-10, 05:25
What color is the wire from the PSU that connects to the pin that is shorted to ground? Red is +5V, yellow is +12V, white is -5V, blue is -12V and orange is PG. Next, you can check for continuity between the two legs of each tantalum capacitor in the back of the board. I have marked the tantalums I …
Re: VLI-486sv2gx4 troubleshooting
Posted on 2021-06-10, 03:50
You can start by checking for continuity between the pins of the power connector: the 4 middle ones are GND, so if there is continuity between those and one or more of the outer pins then you have a short. Make sure to remove CPU and other cards, do your testing on the bare motherboard without …
Re: VLI-486sv2gx4 troubleshooting
Posted on 2021-06-10, 03:06
Your PSU refuses to start because there's a short in the board. Very likely at least one of the tantalum caps has failed short. You will need a multimeter (and possibly desoldering the tantalums) to properly determine what is causing the short.
Re: Trying to revive a PSU from a 386 - I'm part way there
Posted on 2021-06-09, 06:05
Looks like that unit was well built for its time, it's full of Japanese capacitors. In any case I agree with the post above, you first need to disassemble it and give it a good clean before you do anything else. Problem is, you may need to desolder some wires in order to do that so if you don't know …
Re: Please help me diagnose IBM 5151 Monitor Fault
Posted on 2021-06-08, 19:20
I'd like to emphasize that C505 MUST be non-polarized and low ESR. You cannot replace it with any off the shelf electrolytic. When I did my recap I replaced it with 2 of these film caps in parallel. https://www.digikey.com/en/products/detail/pa … E1106JF/2567774 I have used the Polypropylene …
Re: Voodoo 2 SLI?
Posted on 2021-06-05, 20:33
A V2 SLI setup should be great for the Quake 2 era, a P3-600 is a bit newer than what was available when the V2 came out but still a great match. Obviously the Ti 4200 will be considerably faster since it's a more modern card, but you don't need to choose as you still need a primary video card to …
Re: BRAND NEW KDS 19 inch monitor MAJOR problems
Posted on 2021-06-04, 16:45
Discharging a CRT is very simple, just make sure the screwdriver handle is well insulated and leave the monitor unplugged for a few hours before doing it to be extra safe. And don't just carelessly jam the screwdriver there, do it carefully to avoid scratching the tube coating or damaging the rubber …
Re: Utsource.net selling fake stuff
Posted on 2021-06-03, 00:57
My reasoning is if they just sent you plastic with legs the board would probably post normally just with the same amount of cache as before; electrically nothing changed. This. Also, in my experience even broken cache chips won't prevent the board from booting unless there's a short between Vcc and …
Re: Help (re)building a 486
Posted on 2021-06-02, 16:53
After I install the 33mhz oscillator, will I be able to switch from the DX-2 to the Dx-50 without replacing oscillators again to do the tests you suggest? No, if you put back the DX-50 with the 33MHz oscillator you will effectively get a DX-33. The oscillator determines the bus frequency, and the …
Re: Help (re)building a 486
Posted on 2021-06-01, 18:20
Thanks, if my current oscillator says 50Mhz because it runs at 50, shouldn't the oscillator for my DX-2 66mhz be a 66mhz oscillator instead of 33Mhz? Or it just needs to be one of both and the turbo button does the rest? The oscillator sets the bus frequency, so for a DX-50 you use a 50MHz …
Re: Help (re)building a 486
Posted on 2021-06-01, 17:35
For the 33mhz crystal, is this the correct piece or are there more types or formats? I don't seem to find the place on the board where it should be installed also No, that won't work. You want a 33MHz oscillator in DIP-14 format, the component that you are replacing is the metallic rectangular …
Re: The worst motherboards you have had to work with
Posted on 2021-06-01, 17:07
EDO support is limited to a few late 486 chipsets, and it's not at all like using PC100 SDRAM on a board that supports PC66 for example. The only difference in that case is the speed, while using EDO on a board that doesn't support it will probably cause it not to POST or to have strange behavior. …
Re: The worst motherboards you have had to work with
Posted on 2021-05-31, 08:26
PCChips M747 : major instabilities all the time, until it silently died one day. An incredible annoying experience, I made a thread about it. ASUS A7V8X-X : the VIA chipset drivers would make Windows crash randomly, I don't remember if I managed to resolve it by updating. But the worst thing about …
Re: CRT - Adjusting Screen/G2 voltage on flyback
Posted on 2021-05-30, 06:57
Thanks for the input guys. I set the screen voltage as you mentioned and then found this little utility to run some tests: https://github.com/unclejed613/video-test-bench-dos-freeware Everything seems to be working fine!
CRT - Adjusting Screen/G2 voltage on flyback
Posted on 2021-05-30, 00:35
Hi guys I've successfully replaced a blown flyback transformer on my old 14in CRT monitor, don't have a lot of experience messing with CRTs but everything went well. My question now is how do I properly adjust the "SCREEN" knob? I have the service manual of the monitor but the adjustment …
Re: What game are you playing now?
Posted on 2021-05-19, 07:11
Dark Souls A friend is playing this on my recommendation and really enjoying it, so I decided to give it a replay. I originally played and completed it on PS3 (along with Demons Souls and Dark Souls II) a couple times, once as a pyromancer and once as a cleric. I decided to give the remastered …
Re: Chia cryptocurrency - Mining on HDD and SSD
Posted on 2021-05-16, 00:57
Personally I had to dabble with some of the technical aspects of blockchain/ethereum for work years ago (extremely boring work I may add). But even understanding some of the principles behind it I cannot shake a gut feeling that this is all a big elaborate scam, however irrational it may sound to …
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