View Full Version : Abit AL8 Drop Mod help - request
Millyons
06-20-2006, 06:52 AM
Well i got this thing to play with but the vcore is crazy unstable, is there a drop mod for it since i cant find it.
If there isnt will someone help me make one
at techpowerup then got nice pics of the board
http://forums.techpowerup.com/showthread.php?t=4425
i can take pics of mine with close up of any area that is needed
thanks
Millyons
06-27-2006, 05:35 AM
this is why i hace a love-hate relationship with DFI, i loved it since all voltages were 100% stable on my ultra-d but hate it since almost noone does vmods anymore, only for few boards
plz someone this vcore is going wild :)
Millyons
06-30-2006, 02:46 AM
Well i did some reaserch and found that the circeled in green chip on the pic the intersil isl6556 is mabey responsible for the vcore, only thing im worried isnt it a bit to far from all the cpu mosfets and caps to be that vreg, i guess moding the pin 10 (FB) and pin 12 (VDIFF) of it would do the job but i would really like some guru to check this out before i continue
thanks
and here are the data sheets for the
isl6556B
http://www.intersil.com/data/fn/fn9097.pdf
and 6614A
http://www.intersil.com/data/fn/fn9160.pdf
Yes, ISL6556 controls those mosfet controllers (ISL6614). And mod is done to ISL6556 VDIFF, leg number 12. Leg 12 is connected to nearby resistor (don't know the value). You need to lower or rise it's value to get stable vcore :) I suggest first to try lower it with resistor in parallel.
Millyons
06-30-2006, 04:43 AM
Can you help me out with witch points to connect, i did vmods before but i never figured worked on figuring one out
this is what Hell-Fire said in another thread i was thinking about trying this but wanted to make sure,
http://www.xtremesystems.org/forums/showpost.php?p=1359124&postcount=12
but ofcourse im open to all sugestions, are you saying i should lower the resistance between the pin 12 and the resistor that the trace from pin 12 leads to? if so what side of the resistor?
That ISL6556 is also used on AS8 (different package), but same IC. And on that mobo need to lower that (what is pointed by arrow) whole resistor resistance. If i saw right you need to solder resistor in parrallel, like in this pic
http://www.takorautaa.net/article_images/5/vdroop.jpg
and lower the resistance. Otherwise you need to rise it by removing orginal resistor and replace with vr. You have to test.
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