xbox one x fast beep on / off

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  • Themi
    Senior Member
    • May 2020
    • 79
    • Scotland
    #1

    xbox one x fast beep on / off

    got given an xbox one x as dead, no pressure to fix as has been replaced and owner doesn't want it back

    symtoms: press power button, white light, beep on and off almost immediately

    checks:
    • dead short on MEMIO test pad (doubt this is good but I don't have another board to compare against) injected voltage 1v nothing showing on thermal
    • checked under thermal during power on only slight heat in SB, everything else front and back of board cold
    • no shorts on any other test pads MEMPHY etc
    • has standby 1.1v, 1.8v, 3.3v, 5v
    • psu good has 12v
    • no 12v rail short
    • no short on 1.1v, 1.8v, 3.3v, 5v
    • test shorted EN to 3.3 VIN on LDO voltage regulators and get 1.1v and 1.8v
    • no short at retimer or encoder
    • no short at ethernet
    • ports in good condition
    • no damage / burns / holes to board components
    board was tested bare no attached components (drives, etc) only power button board
    tested from bench psu

    I am guessing APU, SB or SB nand ?

    any ideas? I don't know what else I can do to proceed further

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