Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-11-03, 12:11

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not quite. The cost is $86 USD + shipping for 10 pieces. With 6 layer, there is no price cut to go for 5 pieces. I think the product came out looking pretty slick, but it is still untested. If anyone else wants to volunteer testing and put in the order, please let me know. I received final comment …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-11-02, 04:42

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

What do you mean, you think there's going to be another iteration? At these prices, this is the last order I was intending to put in.

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-11-02, 03:53

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I tried to upload the *.rar file to Oshpark, but it said something about the file being unsupported. So I extracted the gerber.zip file and uploaded that. Oshpark wants $54 for 3 pieces, but are we left with that beautiful purple as the only colour option? EDIT: Nope, they aren't letting anyone …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-11-02, 03:38

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

JLCPCB wants $117 CAD, which is $86 USD. I looked at a company in Canada, called Bittele, but they want 4x more than JLCPCB. That's for 10 pieces. There's no point in going lower because the cost doesn't adjust.

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-11-02, 03:20

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm surprised it could not be saved as v4.07. Normally there's a few changes that must be hacked out manually to go down versions. I'm not terribly keen on installing out-of-package software revisions, especially when I don't even see a snap app for the later revision. I think it fortunate hat I did …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-11-01, 12:35

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Where do I buy a paint brush can of silkscreen? And how thick does it go on? Is there anyone else familiar with KiCAD? The JLCPCB guys said there's only 4 layers in the gerber folder (photo attached). So it sounds like two of them (the gerbers) didn't get generated? Anyone know how to generate them? …

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Re: Anyone here able to modify a Lenovo laptop T61 BIOS?

Posted on 2022-11-01, 09:25

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That would have been great if it was as simple as that. But alas... Patched 0.01 uF caps: 0.01uf_patch_in.JPG I tried it with first just the cap on power, then added the second on encoder, but the initial transient noise remails: Transient_noise_with_0.01uf.JPG After about 10 seconds, those …

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Re: Anyone here able to modify a Lenovo laptop T61 BIOS?

Posted on 2022-11-01, 08:07

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There is that transient noise I showed a scope image of earlier. It tends to go away after about 10 seconds of on time. Closer view of it: Transient.JPG If I put a 1uF cap in parallel, not a lot of change, so I put a 100 uF in parallel and that transient noise disappears, but doesn't change the …

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Re: Creating a voltage regulated 386 BL3 module from existing parts

Posted on 2022-11-01, 04:01

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

pshipkov, I'm not using SiS 303, I'm using SiS 310/320/330. Were those MR BIOS ROMs that you sent me for the 303/6/7? If so, that would explain the naming convention used. Do you have for 310/20/30?

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Re: Anyone here able to modify a Lenovo laptop T61 BIOS?

Posted on 2022-10-30, 09:23

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

At this point, I perform a soft reset with CTRL-ALT-DEL, thinking that there won't be a fan failure when the isn't any noise on the encoder's waveform, but I am mistaken. Clean encoder output still haults the fan, as shown here: T61_06_soft-reset_from_GRUB_still_fan_failure.JPG Since the fan's power …

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Re: Anyone here able to modify a Lenovo laptop T61 BIOS?

Posted on 2022-10-30, 09:23

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Immediately when the laptop is powered from a cold state, the encoder waveform is as follows. T61_01_first_power_on.JPG After a few seconds, the encoder's waveform develops noise as follows. T61_02_two_seconds_after_power_on.JPG At the point of 'fan failure', the noise has continued to grow as …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-10-30, 06:34

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If anyone is in a hurry for whatever reason, you are more than welcome to order your own PCBs for testing.

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-10-30, 01:44

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

We do not have a deadline. It's all good. Their script should be detecting the proper number of layers, but it isn't and we'd like to find out what is causing this.

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-10-29, 23:08

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Alignment of the male-male machine pins hasn't been a problem for me with the last two prototypes I assembled. For a good fit, be sure to gently sand down the ABS plastic from cut end of the header.

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Re: Anyone here able to modify a Lenovo laptop T61 BIOS?

Posted on 2022-10-29, 13:22

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've begun looking for some replacement boards online. What do you think the chances are that this pixel column imperfection is with the onboard Nvidia graphics controller? If it is an issue with the onboard graphics, then this board will be useless to me, but if it is the screen, then I'd just use …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-10-29, 12:52

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I personally think the caps on the front tab look neat, but if they are removed, the most you could shave off is 1.5 mm because the trimmer is already touching the heatsink. The alignment of the VRM is perfect. I'm also glad we rotated the socket to have the direction of the words in the same …

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-10-29, 12:07

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Still working on assembly guide...

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Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!

Posted on 2022-10-29, 12:06

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Assembly guide coming later on...

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Re: Anyone here able to modify a Lenovo laptop T61 BIOS?

Posted on 2022-10-29, 11:51

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is the setup. It has been very difficult for me to work on anything with my wife's standing desk platform in the way. A covid purchase that stayed. T61_setup.JPG The fan's header is Vcc, GND, and Tach. For the purposes of the photos, I think yellow is fan power and blue is tach. I had swapped …

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Re: Anyone here able to modify a Lenovo laptop T61 BIOS?

Posted on 2022-10-29, 11:35

by

by feipoa

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

That is what I've been working on. Will send some photos soon.

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