Solder missing RAM-holdings on the mainboard

[MitjaStachowiak_2]

Hello,

my HP 8770w was sold with a Dualcore-CPU. I am now using an i7 3920XM, but there are missing two RAM-holdings on this mainboard (Many manufactures leave them out on dualcore MBs  ). The 4-RAM-MB is too expensive just for this approach. So I tried to solder the missing RAM-Holdings on the Mainboard by hand:

 

But the Laptop does not boot, if I add a RAM to the new holding (Same behaviour as like booting without any RAM). The Laptop still works, if I left the new holding empty.

 

QUESTION: Is it possible, that a 3-RAM-configuration principally does not work and I will have to add the 4th module? Have anyone here successfully expanded the number of RAM-holdings?

[codes]

Are you sure there were no problems with your soldering? I've only soldered once on a motherboard and it turned out I messed up. Never trying that again.

[Arise]

Did you went over every 2 pins and checked for continuity in them?

Also, the socket plastic seems melted, not everybody can do it, is not hard I guess but is not something everybody can do it.

 

Last thing... could there be a custom bios required/custom bios options to unlock both banks of memory or maybe some small resistors/capacitors around that are missing as well?

[MitjaStachowiak_2]

The plastic is a bit melted, because I used too high temperature with the fan   But this is only at the surface, the pins look OK. I tested against shortcuts using an ohmmeter and none of the pins is loose. Which does off-curse not mean, that the electrical connection is OK...

 

I don't think, it's the BIOS - the System does not start, if there is a RAM in the holding, so it gets principally recognized.

 

I will need extreme fine equipment when I try this again

[AleksR17x]

Nice effort, too bad it didnt work the first time.