Xbox 360 0022

If you did not write to the NAND, ignore this step. If you had a bad flash on the NAND, this could be why you have 0022 now.
 * Undo Bad Writes

Check that SMC releases CPU_RST_N Phat: J8C1 pin 2 (Check R8C2: 1K Ohms). Trinity: FT4R2 (Check R4D4: 1K Ohms). Corona: R4P5 pin further from hole. Replace Southbridge U2C1 (Phat) or U3D1 (Slim).
 * CPU_RST_N

Xenon: Check R3C11 and R3C12: 33 Ohms. Check R3C17 and R3C18: 49.9 Ohms. HDMI Phat: Check R4C11 and R4C12: 33 Ohms. Check R4C9 and R4C10: 49.9 Ohms. Trinity: Check R3C5 and R3C6: 33 Ohms. Check R3C9 and R3C10: 49.9 Ohms. Corona: Check R3D3 and R3D5: 33 Ohms. Check R3D4 and R3D14: 49.9 Ohms. Check junction between the sets of 33 and 49.9 Ohm resistors for proper 100MHz differential clock. If bad/missing clock signal: Xenon: Replace ANA_BCKUP U3B4. HDMI Phat: Replace HANA U4C2. Trinity: Replace HANA U3B1. Corona: Replace Southbridge U3D1.
 * CPU Clock

The location of this circuit is as of now unknown on Slims - so it is unlikely to be damaged. Check R7R17: 10K Ohms. Check the connection from the north side of the resistor to CPU_PLL_BYPASS pad/via immediately above. Check that CPU_PLL_BYPASS is not shorted to ground. If it is, replace CPU U7D1 (Phat) or U5E1 (Slim).
 * CPU_PLL_BYPASS - Phat

If all else fails, replace CPU U7D1 (Phat) or U5E1 (Slim).
 * CPU