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excuse me, it is other logic board problem.This logic board problem missing both image and backlight, not usb activity and not video external.This macbook turn on, fans Rotate normal, memory ram good, both slots ram memory is good
PLT_RESET_L=3.3V
Any history fault available?NOT
What is the CPU core voltage after 10s?1.12V constant
Did you try knoen good BIOS?yes, the problem persists; whith chipmunk usb tester, only 5v usb,but no data usb
When board boots, VCORE should drop to 0.75V approx.
There may be a communication problem, because of bad PCH, or CPU.
Also possible to have bad trace, corroded, or knocked off resistor.
Check the series resistors from SPI lines and LPC bus.