VOGONS


Asus P2B-DS Rev 1.06 FSB Modification

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Reply 40 of 72, by Mamba

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Guys,
Is there a bios that can make this board accept HD 500gb (or 320gb) large?
I am not able to mod the 003 beta bios myself...

Reply 41 of 72, by wiretap

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My little tiny PCB's finally arrived, 🤣. Don't know when I'll have the time to do this, but I'll give it a go sometime in the future.

v3E1jHL.jpg

rCavlGZ.jpg

My Github
Circuit Board Repair Manuals

Reply 42 of 72, by wiretap

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After a quick look at my board, I have the 1.06 D02 revision. I'll have to source a ICS 9250CF-08 for this, since it currently has the ICS 9150AF-08. It should be an easy swap, and I probably have one in a scrap board in the basement.

36vjHo6.jpg

ah11Ezw.jpg

bfHUt7f.jpg

My Github
Circuit Board Repair Manuals

Reply 43 of 72, by chrismeyer6

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Very nice I can't wait to see how it all works out for you.

Reply 44 of 72, by Mamba

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wiretap wrote on 2021-01-22, 17:23:
My little tiny PCB's finally arrived, lol. Don't know when I'll have the time to do this, but I'll give it a go sometime in the […]
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My little tiny PCB's finally arrived, 🤣. Don't know when I'll have the time to do this, but I'll give it a go sometime in the future.

v3E1jHL.jpg

rCavlGZ.jpg

Can't wait to see it done.

Reply 45 of 72, by wiretap

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Found some new ICS 9250CF-08 chips for $4ea, so I ordered 5 of them. My mod will be ready to install when I get a break. I'll probably bundle the other 4 PCB's into a kit and throw it on a marketplace once I confirm it works.

My Github
Circuit Board Repair Manuals

Reply 46 of 72, by wiretap

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I'll be testing once I get the ICS 9250CF-08's and get that soldered in.

So this little thing just plugs into the existing jumpers, then transposes them and adds the 4th needed jumper for 133MHz FSB. The R99 pad obviously connects to the motherboard's R99 resistor with a jumper wire.

AYgIdoHh.jpg

oF9Iqv5h.jpg

My Github
Circuit Board Repair Manuals

Reply 47 of 72, by chrismeyer6

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That is really a slick and professional looking part seriously nice job.

Reply 48 of 72, by wiretap

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Old frequency generator removed:
pzQTVjX.jpg

Pads cleaned:
jH1Qzf4.jpg

New frequency generators:
Bqq0lsE.jpg

New frequency generator in place:
ZKfKdNQ.jpg

New frequency generator soldered in place with the mod PCB test fit on the jumpers. Perfectly fits next to those capacitors without touching. 😁
8YScVRS.jpg

My Github
Circuit Board Repair Manuals

Reply 49 of 72, by wiretap

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R99 hooked up. I couldn't find my 36ga wire, so I had to use 24ga which looks giant, 🤣. I'll replace it once I go through some boxes.

2wN4iif.jpg

My Github
Circuit Board Repair Manuals

Reply 50 of 72, by chrismeyer6

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Excellent work on this mod. I can't wait to see how the testing phase goes!

Reply 51 of 72, by Mamba

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Awesome... Please take me into consideration for one of them!!

Reply 53 of 72, by wiretap

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Well, no dice on the testing. I believe the frequency generators are counterfeit. The text on top of them comes off with isopropyl alcohol and the motherboard doesn't even post with the new chip installed. I put the old chip back on and the motherboard boots just fine. Testing on hold until I can source a legit frequency generator.

My Github
Circuit Board Repair Manuals

Reply 54 of 72, by chrismeyer6

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Oh no that really sucks. Are you able to get your money back on the counterfeit chips?

Reply 56 of 72, by chrismeyer6

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Good I'm glad your not out the money for them.

Reply 57 of 72, by pshipkov

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Bummer.

Actually i remember having a 1.06 D02 board that did not like the 9250 clock gen for some reason. The chip got warm, but board didn't post.
Same chip worked on 1.05 revision, for example.
No idea why.

Is the FSB control board sitting stably on the 3 jumpers underneath when pushing or pulling jumpers ?

Btw, if you cannot find clock gens nearby - i have few that collect dust here. Can send you 1 or 2 at no cost.

retro bits and bytes

Reply 58 of 72, by Mamba

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Out of curiosity, the modification works with the old clockgen also?
Not at 133mhz of course.

Reply 59 of 72, by wiretap

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@pshipkov -- that may be the case with incompatibility for some odd reason. The chip does get warm, but no post. As far as the little board, it is pretty sturdy. I pulled jumpers off and put them on with one hand, just holding my thumb on the motherboard connector side. It does lean a little bit, but it doesn't fall of the board and has a good amount of friction-fit.

@Mamba -- I didn't test that, since this mod adds the 4th row of jumpers which specifically takes advantage of the 9250 clock gen. The 4th row would not map to anything on the old one.

My Github
Circuit Board Repair Manuals