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    Replace 216-0810005 GPU with 216-0810028 ?

    Hi everybody, as the prices for 216-0810005 keep rising and the supply is short these days, my supplier told me that the manufacturers in china are using 216-0810028 as a subsitute. They seem to alter the BIOS to make them work with the 820-2915 boards. However, I have searched the web and...
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    820-2828 Imac 27" 2011 - GPU issue

    Hi, I just stumbled over this as we have quite a few iMacs here with bad GPU. Can you explain this a bit further? What is the reason behind this? THANKS!
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    Retina LED panel automatic brightness and resolution issues

    Hi there, I am the owner of a larger repair center in Germany that repairs anything on smartphones, tablets and macs, but specializing in board repairs. I am quite new to the board and kept reading a while, now I have a little problem. We installed lots of screens to 13" and 15" retinas which...
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    820-3332-A No internal video unless external display is connected and disconnected

    Replaced U9100 and only after that saw that it is a programmable part, so the machine wont boot anymore. Reballed the original part and same behavior as before. Now I will try to replace it from a donor board. Are they interchangeable? And also, can the blanks be programmed? Will keep you posted.
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    820-3332-A No internal video unless external display is connected and disconnected

    Hi there, first of all I wanted to introduce myself: My name is Jan and I run a repair company in Germany. We are specialized in board repairs for Apple and Samsung devices. I am new to the board and hope we can learn from each other with every new case being discussed here. Today I need some...
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