820-3302-A no image

[donnos]

Hello, IMAC came in with no boot in the first place. replaced Q7950 and start up now.
right now i have FAN Spin but no chime and no image, only LED 1 and 2 comes up. i have VCore on both CPU and GPU(0.8V). what else do i check?

 

[2informaticos]

GPU_GOOD not present?
Check power good signals for all GPU related power supplies; like in pages 60/74/80.

 

[donnos]

PM_EN_REG_GPUCORE_S0 = 3.27
PM_EN_REG_GPU_VDDQ_S0 = 3.27
PM_EN_REG_GPU_P1V05_S0 = 3.27
PP1V5R1V35_S0_GPU_REG = 1.5v
PP1V05_S0_GPU_REG = 1.05v
PM_PGOOD_REG_GPU_VDDQ_S0 = 3.27
PM_PGOOD_REG_P1V05_GPU = 3.27
PPGPUCORE_S0_REG = 0.9
GPU_GOOD = 0
hmmmmm all looks good to me

 

[2informaticos]

Heat GPU for test.

 

[donnos]

heat and still no luck.. gonna get it replaced and see