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Exact voltage setting is only important on M92, especially when the screen has some issues with contrast. There are tools to adjust it.
Be careful buying those cheaper screens on Ali. In most cases they are selling kind of sorted out by the factory screens with malfunctions. Pay attention to the correct version of the screen! You need ED097OC4 (LF) for M92 and ED097TC1 (LF)-55 for M96.
During disassembling it is easy to damage the flexible cable to the buttons board. It is soldered to the PCB. So please be careful especially if you are trying to avoid soldering.
Also I suggest to cover edges of the screen with scotch before you insert it , to protect them against hard contact to the metal frame. Double check after you inserted it it is really correct sitting in shape. I ruined a couple screens just ignoring this step.
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