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[HELP = (] pencil vmod for undervolting

post #1 of 10
5/23/10 at 11:34am
Thread Starter 
hi guys, this is regarding an Intel D201GLY m-ITX mainboard with a Celeron 215 (Yonah core) 1.33GHz soldered on, it's a low-end, low-power system & so the BIOS settings are very limited as well, the processor doesn't have SpeedStep function, vcore is stuck at 1.32v, making it not so ideal for its power-saving purpose... then I started to wonder if there's a way to undervolt it, I googled & found this, it's in German, which I don't understand... google translated to my rough understanding, it's GLY2 mainboard, as opposed to GLY of mine, but I've checked, the voltage regulator & most circuitry is almost identical, so I gave it a try

http://www.meisterkuehler.de/forum/s...-35v-1-2v.html



after only 1 attempt, it worked! vcore went down from 1.32v to 1.12v, temperature became much much colder, & it's apparently stable being stress-tested with SP2004, I was so happy.. until... the next day, I noticed the vcore automatically dropped again, until 1.1v only, I freaked out a bit, I'm sure the graphite wasn't messed by anyone at all... I stress-tested it again & luckily it's still stable, few hours later, the system couldn't POST BIOS upon rebooting, I confirmed it's due to the vcore auto-decrement, I rubbed off the graphite a bit & it boots again, then I pencil again the same thing happens, the vcore just won't stay still.... I'm using 2B pencil if that matters?... & I did blow away excessive graphite before booting... is this normal? that the graphite-reduced-resistance is this unstable? would potentiometer fix this?

datasheet & actual picture



THANKS IN ADVANCE FOR ANY INPUT
Edited by ashy - 5/23/10 at 11:59am
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post #2 of 10
5/24/10 at 6:11am
Looks more like you're creating a larger vDroop then lowering vCore. I would stick with FB adjustment. Which will most likely mean you'll need to remove a resistor and add a slightly larger potentiometer.
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post #3 of 10
5/24/10 at 8:23am
Thread Starter 
oh ic... is there a side effect by doing so (vdroop)? by the way, just now I pencil to 1.16v, after about 10 hours it's now 1.144v, hope it doesn't drop too much from now on & will stay in stable range....

or... could you please guide me on what to do to properly adjust vcore? FB is pin9 & in the picture above it's connected to a resistor... is that the one I need to work on? billion thanks in advance!
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post #4 of 10
5/24/10 at 8:48am
Thread Starter 
p/s: I forgot to mention, even at 1.08v it will still orthos stabily, but if I reboot it will not POST... is this a sign of... that.. it's currently limited by how much vdrop can be created instead of how low the processor can run stable with? thanks again
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post #5 of 10
5/24/10 at 9:45am
That resistor that is labeled "95A" should be the one to remove. You'll need to remove it and then measure it's value once it is removed from the PCB. Then you'll want to use a VR that is a little bit larger. Tune the VR(potentiometer) to the same value as the resistor you replaced. The you should be able to increase the VR's resistance and lower voltage.

As far as posting, you might be tripping a low voltage requirement that may be a minimum value during posting.
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post #6 of 10
5/24/10 at 9:50am
Thread Starter 
Quote:
Originally Posted by PizzaMan View Post
That resistor that is labeled "95A" should be the one to remove. You'll need to remove it and then measure it's value once it is removed from the PCB. Then you'll want to use a VR that is a little bit larger. Tune the VR(potentiometer) to the same value as the resistor you replaced. The you should be able to increase the VR's resistance and lower voltage.

As far as posting, you might be tripping a low voltage requirement that may be a minimum value during posting.
oic... is the minimum vcore requirement usually BIOS-implemented or?.. I mean if I lower the vcore below that value alternatively it won't POST either? many thanks again!
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post #7 of 10
5/24/10 at 11:39am
I'm not sure. Just making a guess.
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post #8 of 10
5/24/10 at 11:51am
I can speak German. If I need to translate something, shoot me a PM
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post #9 of 10
8/10/11 at 12:42pm
Hi Ashy,

Did you get any further with your under voltage mods for the D201GLY2 because I would be interested to hear your progress?

Resistor 95A will have a value of 953 ohm if that helps you. You might want to refer to the data-sheet too because I'm guessing that the value of that resistor was calculated from a formula and there may be repercussions if it is altered!?

Regards,

Ian
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post #10 of 10
8/14/11 at 10:14am
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FB is pin 9.. that is the pin you need to have VR on.. Pizza has traced it the resistor its linked to in the pic for you. You will likely need to ADD resistance at pin #9 to lower actual vcore.
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