ive been doing some reballing lately ,and i faced many 0003 error boards after reballing , i found what exactly was the problem , after a few tests , i found that when removing or soldering the gpu ,you have to be very careful with the heat temperature , too much heat will fry the gpu ,you might do a successful reballing and soldering , and the gpu fits perfectly , but you still get an error , the reason for that is that you applied too much heat on the gpu so it got bad and its not working any more , if you did a gpu and it got bad youll get 0003 , and the bad cpu will give 0002 , i read a post by some guy in the xboxhacker.net forum about the resistance between the ceramic condensers that fits on the power source of the gpu current like in
, it has to be around 2 ohms , if you got a 0 ohm your gpu is short and will give a buzz sound and a 0003 error when board is powered on , bridged balls under the gpu in the power area that is the center of the gpu will give the same error but im talking about the error that appears after a successful soldering or reflow ,i tried soldering the same gpu on another board and it gave me the same result , i tested the resistance and found it 0 , i removed the gpu ,and turned on the board , it powered but gave a 0020 as expected because there is no gpu , to be sure that your gpu is not bad before soldering it , test it with an avometer on those points , around 2 ohms is the right mesure , if 0 then its dead ,and no use soldering it ,
i face another error 0020 , this one is for the power of the small memory thing on the gpu , it gets its power from this trace pic0020.jpg, if you had this error in a virgin board then its a bad solder ball , try reflawing but if you got it after a successful reball then the memory thing is dead , and you need to replace the gpu with a working one.
i lost 5 boards to get to this point of knowledge , so i dont want any other people to suffer as me ,
good luck every body