The rework of a graphic card on a notebook can solve the problem of a blank screen on most of times, but it's only a temporary solution to the problem. Most of the times, the gpu reheats and even with newer heat more efecientes solutions you will have the same problem in a matter of months.
So, even thought it's more expensive to do a reballing, it can be a better way to ensure that the repairment will have a long-term effect.
Here is a video that can clarify what is the reballing concept.
This isanadvancedtechnique, so it is notadvisable totry it withoutthe correct materials/machines.
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