analyze of failures repair Nvidia chip several times
when we repair Nvidia chip of laptop,sometimes we encounter the BGA that have been repaired one month or several days ago need rework.
especially HP laptops, such as V2000,V3000 Series,we add silver strip for it,the temperature of BGA under 70°C.Over a few days,this laptop need repair. When confronted with such a failure, we need to replace the chip.because this was not Solder Balling Sealing-off that connect the the chip and circuit board,but Solder Balling Sealing-off that connect the core chip of Graphics Chip and the base plate.
the picture show a open core of Nvidia chip that have chip base plate, filling glue, core chip, Solder Balling of chip and base plate.
Let us look at a cross-section diagram:
when we repair the BGA,we just repair the Solder Balling at the bottom of chip.we can not repair the Tiny Solder Balling Between the core and base plate. even if the engineer rework the BGA and welding the solder balling Between the core and base plate, the laptop Graphics card are still very easy to failure.
this explains why failures repair Nvidia chip several times. In such a solution Replacement Chip. After the replacement of chips, you had better replace silica gel that between chip and heatsink with silver strip. This method completely solve this stubborn problem.
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