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Hi,
I've got a 820-3787-A board which is stuck in power cycle. PP3V3_S5 is fine. Got orange led on the magsafe plug.
With multimeter I could see that PP1V5_S0, PPVCC_S0_CPU, PP1V5R1V35_GPU_REG_R, P1V05_S0GPU_REG_R, PP1V05_S0_REG_R, PP1V35_S3, PP5V_S4 are trying to start up, there is a voltage...