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Re: Ways to safely transplant / replace 160-pin QFP chips

Posted on 2023-06-06, 22:10

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

For me, I guess it depends on the size of the chip and also the rarity of it. For a smaller QFP, it might be too hard to hold with two fingers. A large one though, no problem. I'm usually not so concerned with breaking legs if it's a brand new chip or if I'm the first one removing it from the …

Re: How can I safely transplant a 160-pin QFP chip?

Posted on 2023-06-05, 21:38

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Chip quik is great for removing ICs I agree, but how do you clean it off all the legs of a fine pitch QFP before reusing the chip? I've only used it to removed defective parts that I no longer care to use What I usually do is hold the chip between my thumb and index finger, then use a drag …

Re: Less popular Youtube channels

Posted on 2023-05-30, 00:37

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Awesome. Thanks for the links, everyone. Not sure how well known this channel is, but I didn't see anyone mention Noel's Retro Lab. https://www.youtube.com/@NoelsRetroLab

Re: How can I safely transplant a 160-pin QFP chip?

Posted on 2023-05-29, 12:41

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I think you're right. I read through the posts, but I didn't realize that there was a year gap. You might get better results if you started a new thread, or at least edit the first post with a line at the top stating that there's a new line of questioning. At least, that's what I have done in the …

ATX PSU Latching Circuit PCB for Momentary Switch

Posted on 2023-05-29, 12:18

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here's a little PCB I made for myself that I wanted to share here in case it can be useful to anyone. It's a latching circuit that will allow you to use an ATX PSU and case (with a momentary power switch) with an AT style motherboard. https://oshpark.com/shared_projects/h6LgDD3k https://i.imgur.com/ …

Re: How can I safely transplant a 160-pin QFP chip?

Posted on 2023-05-29, 11:35

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not to criticize your approach, but there's a few methods for removing surface mounted components that are cheap, easy and nondestructive. Just for future reference... As easy as hot air can be, there's an even easier and cheaper method for removing surface mounted ICs. It's called ChipQuik. Here's …

Re: What should I do with this problematic CRT monitor?

Posted on 2023-05-09, 20:49

in Marvin \ Video

in Marvin \ Video

Awesome. Thanks for the info, guys! I always learn so much when I post questions here. I can definitely check for bad solder joints, that's not too hard. And I do have a set of insulated drivers, rated up to 1000 volts IIRC. But I think the elephant in the room is the scratches on the screen. If I …

Re: What should I do with this problematic CRT monitor?

Posted on 2023-05-09, 00:33

in Marvin \ Video

in Marvin \ Video

When I say the picture is too dark, I mean that on the default brightness setting the screen is way too dark to use. Turning the brightness up, even all the way up, still doesn't make it bright enough. And as a result of turning the brightness up, the picture gets blown out (text is blurry and …

What should I do with this problematic CRT monitor?

Posted on 2023-05-07, 19:26

in Marvin \ Video

in Marvin \ Video

Hey everyone! So to make a long story short: I purchased a CRT monitor off eBay and it arrived with issues. The seller gave me a full refund and did not require me to ship back the monitor. So now I have this problematic monitor and I'm wondering what I should do with it. Attempt repairs, or throw …

Re: Replacement Slot 1 Heatsink Clips?

Posted on 2023-01-22, 13:02

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The Romex wire worked fine, it just looked very ugly. Again, it was only a temporary hack so I could test the CPU right away. I only had #6 machine screws on hand, which were too large, and the first local hardware store I went to didn't have anything smaller than #6 for some strange reason. When I …

Re: Replacement Slot 1 Heatsink Clips?

Posted on 2023-01-05, 01:34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My local hardware store actually had a good selection of springs, some of them felt strong enough. But I didn't feel like experimenting with them. The holes in my heatsink were the perfect diameter to tap for M4 x 0.7 screws, and I figured the nice hex head on the M4 screw would look nicer, so …

Re: Replacement Slot 1 Heatsink Clips?

Posted on 2023-01-03, 23:25

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Why not use a couple of screws, washers nuts and springs? That's actually going to be my backup plan. Although I don't have any springs, I was going to simply use machine screws and nuts, and just be careful not to over tighten them. Or if I can locate the correct size screw, I could tap the holes …

Replacement Slot 1 Heatsink Clips?

Posted on 2023-01-03, 22:48

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I received a computer that wasn't packaged well enough. The CPU heatsink broke off during transit. https://i.imgur.com/VFx7nrT.jpg The above picture is the style clips my heatsink uses. I know there's a lot of different style coolers for Slot 1 CPUs, but this type of clip seems to be semi common. …

Re: Problem with ATX Soft Power Switch (Possible Fault on Motherboard)

Posted on 2022-12-09, 18:08

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

OK, I think I found out what the issue is. I removed the 74'14 and replaced it with a brand new part, but pin 2 still exhibits the same behavior as before. So I don't believe there is anything wrong with the original 74'14. I've also observed that pin 3 is always high, pin 4 is always low, and pin 4 …

Re: Problem with ATX Soft Power Switch (Possible Fault on Motherboard)

Posted on 2022-11-30, 15:12

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

>Pin 2 is measuring 0.03v, but will briefly measure 4.85v at times Is that measurement error - not pressing probe down hard enough/missing the pin? if not then you found your problem I thought so too, but no. And I just checked it again last night to be sure. Pin 1 will be near 0v and jump to 3.65v …

Re: Problem with ATX Soft Power Switch (Possible Fault on Motherboard)

Posted on 2022-11-28, 18:29

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

A few years ago I had a thread about my Biostar MB-8500TTD and Feipoa told me that he added an ATX power connector to his MB-8500TTD but it did not work. In what way did it not work? PS - Hello, motherboard brother! :) negative reading in diode test mode? was this on system plugged in? Never do …

Re: Problem with ATX Soft Power Switch (Possible Fault on Motherboard)

Posted on 2022-11-28, 02:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for the schematics! When I get the time I will review the motherboard again and see what I can come up with. In the meantime I will study the schematics.

Re: Problem with ATX Soft Power Switch (Possible Fault on Motherboard)

Posted on 2022-11-27, 23:31

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

OK, so I was poking around a little and found some things that confuse me further... The front panel connector pins 10 and 11 are for the power switch. Pin 10 goes to pin 1 of a 74HCT14. I have not (yet) been able to trace out any more. The 74'14 is located between two ISA slots and is very hard to …

Re: Problem with ATX Soft Power Switch (Possible Fault on Motherboard)

Posted on 2022-11-27, 14:44

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

One other thing I forgot to mention in the first post... If I hook a switch up to the front panel connector pins 10 and 11, it does nothing. The computer will power itself on, and pressing or holding the power button doesn't do anything. Sorry for leaving that part out, seems kind of important. :) …

Problem with ATX Soft Power Switch (Possible Fault on Motherboard)

Posted on 2022-11-27, 00:56

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hey, everyone! So I'm having an issue with the soft power switch on a Socket 7 motherboard. This is actually the same board from another thread I posted , I had an issue with voltage at the PS/2 ports. It's a Biostar MB-8500TUD-A. An image of the motherboard. https://i.ebayimg.com/images/g/7- …

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