Hey guys,

had a 820-3476-A board, status as below:

Machine has no water damage history, and when i put the charger fan spin 5 sec and turn off than turn on and run normally without image.. I put a keyboard pen and no lighting up.

PP3V3_S4_TBT pin 1 C2951 = 3.326v
PP1V35_S3_CPUDDR pin 1 C1060= 1.358V
PP1V35_S3 pin 2 U7400 = 1.359V
PP1V05_SUS pin 1 R1890 =1.038V
PP1V5_S0 pin 2 L7870 =1.51V
PP1V05_S0 pin 4 U8005=1.043V
PP1V05_S0SW_PCH_HSIO pin 1 L1290 = 1.038V
PPVCC_S0_CPU pin 2 L7320 =1.74V

i have replaced a bios file with a clean bios and same think. Any idea guys ??? Thank you

hi there! did you have 5V on L8300 or backlight output 49V on pin 1 Lvsd connector? - if it right no resistance to LCD backlight, try to holding flashlight to the apple logo?
PP_vcore is 1.8V?
I think you need test for outside image via Mini DisplayPort Thunderbolt to VGA D-Sub
May be matrix broken.