MacBook Air A2337, motherboard number 820-02899-A. In short, this Air had a damaged backlight. The screen has been tested and works fine on an external monitor. I reinstalled the operating system, but nothing changed. PP5v_BKLT_A/B 5V
PP5v_BKLT_D 5V
PP5V_S2 5V
PP5V_SW_LCD 5V
P5VS2_PWR_EN 1.8V
P5VS2_BST_R 8V
P5VS2_SW 5V
PPBUS_5VS2_VIN 5V
PPVOUT_LCDBKLT - Doesn't short 0V
FP800 - Both sides 13v
BKLT_EN_R & BL_PWR_EN - 1.8v
IPD_LID_OPEN_1V8
PP3V3_SW_LCD
QP800 3pin 13v 4 pin 12.8v 6521pin 0v i changed

LP800...