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Install S7 G930A motherboard on s7 G930F frame / screen

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Hello,

I purchased a replacement screen with frame for my S7 G930A but the frame is for G930F, and after installation everything works fine but the phone does not catch the gsm signal due to small differences in the GSM/wifi interconnections and antennas between G930A and G930F. I tried many combinations with interconnection cables and antennas from either G930A or G930F model, I tested the cables which seem to work properly but I could not find the right combination to have the GSM working properly, can anyone help ?

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