Xbox 360 0020

Xbox 360 SMC Error: 0020

ERROR_GPU_RST_DONE
GPU_RST_DONE signal missing after seqUnReset time passed

This means the GPU did not assert the GPU_RST_DONE signal within the allotted time

GPU Reset Done


 * This signal must be checked quickly, immediately after powering on
 * Check if GPU_RST_DONE is high (3.3V):
 * Phat: FT2P13
 * Trinity: FT3R16
 * Corona/Winchester: FT3T2
 * If signal is missing, proceed to the next step
 * Check GPU_RST_DONE 1K Ohm resistor:
 * Phat: R3P7
 * Trinity: R3R19
 * Corona/Winchester: R3E6
 * Check GPU_RST_DONE 10K Ohm pull-down resistor:
 * Phat: R3P6
 * Trinity: R3R20
 * Corona/Winchester: R3E7
 * If the signal is present, resistors are ok, but this error persists, replace Southbridge:
 * Phat: U2C1
 * Slim: U3D1

GPU Reset


 * GPU_RST_N must go high in order for the GPU to run
 * It is controlled by the Southbridge
 * Check that GPU_RST_N goes high (1.2-1.8V):
 * Phat: FT2P14
 * Slim: FT3R17
 * If missing signal, replace Southbridge:
 * Phat: U2C1
 * Slim: U3D1

GPU Clock


 * Check junction between the sets of 33 and 49.9 Ohm resistors for proper 100 MHz differential clock
 * If bad/missing signal, check the values of the resistors as follows:
 * Phat:
 * Check R3C7 and R3C8: 33 Ohms
 * Check R3C15 and R3C16: 49.9 Ohms
 * Trinity:
 * Check R3C3 and R3C4: 33 Ohms
 * Check R3C7 and R3C8: 49.9 Ohms
 * Corona/Winchester:
 * Check R3D10 and R3D12: 33 Ohms
 * Check R3D11 and R3D13: 49.9 Ohms
 * If still bad/missing clock signal, replace clockgen chip:
 * Xenon: Cypress CY28517 U3B4
 * Zephyr, Falcon, Jasper: HANA U4C2
 * Trinity: HANA U3B1
 * Corona/Winchester: Southbridge U3D1

GPU


 * If all else fails, GPU is bad and must be replaced:
 * Phat: U4D1
 * Slim: U5E1