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Aporte original por: lemerise ,


U8900 GPU power buck converter: solder on pins around the U8900 IC need to be redone. Use a fine tip, good flux and solder for the touch up. Make sure to not bridge the pins with solder. Dont reflow or remove the IC. Apple was aware of the problem with this model. Their repair solution was to install a rubber pad over the IC to compress it with the back panel but this was not a permanent solution. For more infos make a search on google: U8900 repair