solder Vid4 to ground and shorten the Vid[0:3]'s pad,i got 0.84V when set normal voltage in bios and 0.76V wher set low voltage.the battery can last for 140mins playing rmvb movie,with LCD 50%brightness ,wifi is on ,bios 0511.when playback ,the cpu usage is 30% avg.
will do some battery benchmark later

after analysis,the Vid[0:5] pins of Isl6218 are shown in the pic below : 

 take Pm753 for the example,its Vid[5:0]is 110011 when it runs at full speed 1.2Ghz under 0.892V,if you want to raise its Vcore,you can change the Vid[0:5]to 100011 and you get a Vcore of 0.924V ,it means you can raise the FSB to a higer frequence,but it runs hotter.to change a Vid bit from 0 to 1.you just solder the two pad in the Vid oval together,to change a Vid bit from 1 to 0,you just need to solder the right pad in the oval to nearby GND point,clamping it to ground.

because eeepc use a method to lower the Vcore,PM753's original Vid is 110011(0.892V),but the voltage of the Vcore checkpoint is only 0.76V,so what i need to do is to raise the Vid combination to get a higher Vcore to let it run stably at 1.2G.like 101011 i get a Vcore of 0.912V(test by multimeter)

1、将板子放进恒温烤箱进行预热及干燥，温度以70-80度为宜，前提是不能损坏板上的不耐温元件，否则要现行焊下这些元件。

2、固定到BGA返修台上，设置目标温度及升温速度，使用合适的风嘴，将助焊剂吹到芯片底部，大型的BGA芯片还需要从板子两面同时加热。

3、当芯片能够移动时立即将其夹起，修整板上的焊盘，再刷上助焊剂，焊下的celeronM353就扔一边去。

4、将BGA封装新的或者重植锡珠的二手PM753按照定位标志对准原有焊盘，加热过程同上，PM753达到温度锡珠熔融会稍微下沉，此时即可认为焊好了，缓慢降温，完全冷却后测试无误就算完成了。当然还有很多细节。。。

   i just show you guys what protentials your EEEpc has,how far the mods on EEEpc can go.i am neither a staff of asus,nor a CPU seller,even i would not do soldering work for anyone...

   the next thing i plan is to test the lowest Vcore that my PM can run at 1.2Ghz,and improve the efficiency of the cpu cooler.it may make my eeepc powerful and cool.

   我并不是要号召大家都来这样改EEEpc，很多人的eeepc可能仅仅是第二第三台notebook，随便玩玩的，所以我也是随便玩玩，在这个小家伙身上大家可以随意发挥自己的想法和创意，这是一种很好的事情。大家日常工作也是这样，不是你的能力不能去到那个程度，是你的思维不能延伸那么远而已。

现在使用eeepc，用电池的时候就在bios里头设置为低电压、70MhzFSB、840Mh core；用外接电源就设置为正常电压、100MhzFSB、1200Mhz core。

in bios 0511,now i can adjust PM753 work at full speed 1.2Ghz and low speed 840Mhz.

my email address is : guryhwa1121@hotmail.com

thanks a lot!