Hi, so I get a board 820-01521-02 today and I am really annoyed because it cames for a no backlight and full fan speed issues. So I solved the full fan speed issue by replacing resistors around a sensor chip. But then I get to solve the backlight issue, I saw 2 resistors (R8452 and R8453), they were blown, I replaced them. I powered up the machine (in the Mac case, with the battery pluged in and the screen pluged in) the amp meter get to around 20V 0,250amp, like a normal boot, then stops, no fan no screen, no battery charging and get to 20V 0,000amp, during boot.
And now after testing all the rails for the T2, I found that the machine doesn't have PP5v_G3S, no PP3v3_G3S and no PP1v8_G3S. Non of them are shorted, the machine was perfectly working without backlight, I don't understand the resistors I replaced are non related to a direct communication with the T2 or PMU. I also don't hane any enable signals for the previous rail.
Note: In Apple configurator I have an error message when I try to revive the board: Gave up waiting for device to transition from DFU state to DFU stave
And now after testing all the rails for the T2, I found that the machine doesn't have PP5v_G3S, no PP3v3_G3S and no PP1v8_G3S. Non of them are shorted, the machine was perfectly working without backlight, I don't understand the resistors I replaced are non related to a direct communication with the T2 or PMU. I also don't hane any enable signals for the previous rail.
Note: In Apple configurator I have an error message when I try to revive the board: Gave up waiting for device to transition from DFU state to DFU stave
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