Re: NEC Multisync 3d nec-jc1404hma repair help?

Posted on 2022-10-19, 19:50

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

superchill wrote on 2022-10-19, 18:42: Any update on this? Seems like I have a similar issue... I haven't had the time to get back into it. It's not the easiest monitor to disassemble and reassemble 😀 Please post here if you have any luck though.

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NEC PowerMate SX/20 issues with some games

Posted on 2022-10-17, 21:48

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by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello everyone, So I have a nice NEC PowerMate SX/20. It's running DOS 6.22 and I added a SB16 audio card to it. I love the system for playing older games, especially old Gameshow games like Classic Concentration, Card Sharks, etc. All of those games work great. The issue I am having is I have …

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Re: Rampart - DOS (IBM AT PS/2)

Posted on 2022-05-13, 18:58

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by ArcadEd

in Marvin \ Software

in Marvin \ Software

Well, never mind. I tried the install on my Win98 box and it worked fine. So it must be something with my 386 causing issues.

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Rampart - DOS (IBM AT PS/2)

Posted on 2022-05-13, 18:56

by

by ArcadEd

in Marvin \ Software

in Marvin \ Software

I recently bought a nice boxed copy of Rampart. Problem is, the disks seem to be bad. They read fine, but the install program doesn't do anything it just hangs. I thought I would try creating some fresh disks first to see if that is the problem, but I can't find the disk images for this game on …

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Re: NEC Multisync 3d nec-jc1404hma repair help?

Posted on 2021-12-31, 00:54

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Progress! :) This looks like horizontal sync signal not making through properly or clean enough. Keep checking these components that was wet from the capacitor juice. Cheers, There is a POT that seems to have some corrosion on it. I have to assume those can be effected as well. I'll try to find it …

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Re: NEC Multisync 3d nec-jc1404hma repair help?

Posted on 2021-12-29, 03:35

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My wording meant required! Replace IC please and that both capacitors. 100uF 35V will be also bad. And clean off these gunk too. Cheers, OK, so I found a total of 3 bad resistors and 2 bad diodes. Along with 4 caps that showed signs of leaking.. I replaced and cleaned up everything, including the …

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Re: NEC Multisync 3d nec-jc1404hma repair help?

Posted on 2021-12-20, 21:16

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I did like you suggested and found the fused resistor and it seems good. However, I found 2 blown resistors and diodes along the way. Plus a few caps that seem to have leaked. Do you suggest replacing the LA7835 Vertical IC as well? Is there a pretty good chance it's fried?

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Re: NEC Multisync 3d nec-jc1404hma repair help?

Posted on 2021-12-20, 18:01

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Ok, that makes sense. Thank you.

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Re: NEC Multisync 3d nec-jc1404hma repair help?

Posted on 2021-12-19, 23:56

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That black thing with white band is diode, rarely fail, but check it with your meter to confirm is good. What is the two capacitors values are? These capacitors' juice is what cause corrosion and got dried up, which blown that vertical IC. When this happens, one more thing will be also blown is …

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Re: NEC Multisync 3d nec-jc1404hma repair help?

Posted on 2021-12-19, 22:39

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I got the data sheet for the IC, but I wanted to ask about some of the resistors. I tried to take a close up picture, is it normal for them to have like that black leakage? Some have green corrosion as well.

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Re: KVM Switch for 386+

Posted on 2021-12-18, 16:20

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by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, I tried a manual switch box and still no luck. In fact the video doesn't work either. I just don't get it because all the switch box is doing is a wire to wire connection. Maybe it has to do with the cables? I tried 3 different vga cables, no luck.

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VLB Controller (Data Technology) FDD Bad?

Posted on 2021-12-17, 16:31

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So as I continue on my path of creating my classic DOS machine I have run into a new problem. My VLB HDD/FDD Controller was working great. Now, the FDD part just stopped working. I tried 2 different cables and 3 drives. Nothing. It doesn't even try to boot from the floppy anymore. It was working for …

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Re: Sound Blaster 16 Vibra PNP in DOS

Posted on 2021-12-15, 02:24

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Quick update, I found the broken trace and got it all fixed up. Now getting continuity to the 12v pin on all the isa slots from the power pins. Soon as my new connector comes in and I can solder it in, test and give it try. Thanks again for the help!

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Re: Sound Blaster 16 Vibra PNP in DOS

Posted on 2021-12-13, 00:53

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks. I already pulled the connector because I wasn't sure if there was any damage under it. It looks like there might be a little button CAP (mustard colored, circled in picture). I feel like the 12v passes through one of those, but I'm not entirely sure. If it does, would it be ok to bypass it? …

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Re: Sound Blaster 16 Vibra PNP in DOS

Posted on 2021-12-12, 23:36

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, found some corrosion that looks to be from an old barrel battery that was removed before I got the board. I had replaced it, but there was no noticeable damage on the top side. I have to removes the AT power plug on the motherboard and do some cleaning and testing. Broken voltage traces for …

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Re: Sound Blaster 16 Vibra PNP in DOS

Posted on 2021-12-12, 19:27

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I found one from Phoenix Enterprises that I think will work. https://www.peconnectors.com/power-pc-connectors/hws13932/ AT-Style Power Connector Power Latch Header 12 pin .156" (3.96mm) spacing Break-away polarizing keys Straight PCB mount Mounting Pegs

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Re: Sound Blaster 16 Vibra PNP in DOS

Posted on 2021-12-12, 18:30

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yeah, found some corrosion that looks to be from an old barrel battery that was removed before I got the board. I had replaced it, but there was no noticeable damage on the top side. I have to removes the AT power plug on the motherboard and do some cleaning and testing.

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Re: Sound Blaster 16 Vibra PNP in DOS

Posted on 2021-12-12, 16:03

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I just pulled up a pin out of the ISA slot and checked some voltage. Sure enough I am getting 5v, -5v, -12v but on the 12v pin I am only getting around 4.2v. I guess I need to do some digging to figure out if that is fixable or not. I should mention I do get a good 12v at the molex connectors. I …

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Re: Sound Blaster 16 Vibra PNP in DOS

Posted on 2021-12-12, 14:24

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Regarding the faint/garbled/no sound: Do serial mice work on the computer? If not, the -12V supply on the ISA bus might be bad / missing. Try re-plugging the power supply to the mainboard, in case you have a bad contact. Regarding the game port: Please double-check that you do not have more than …

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Re: Sound Blaster 16 Vibra PNP in DOS

Posted on 2021-12-12, 06:56

by

by ArcadEd

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I went through the video. Followed his steps, but came to the same results. If I start up doom and crank the volume I can kind of make out some sound effects, but they are a garbled mess and very faint. Definitely in sync with the game though. Diagnose still gives me no sound as well.

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