Switch won't boot (low VBUS resistance)

Switch won’t boot.

  • Had a short on PI3USB. Replaced the chip
  • Replaced the M92 just in case.
  • Noticed with USB breakdown board that 15V VBUS line has strange diode values. Resistance to ground is only 120 ohm
  • SYSLINE has normal resistance
  • I didn’t find any shorts, FETs seem to be okay and also BQ.

What could pull the VBUS line down? Thanks!


remove port and check again, you never know what port been suffered

Changed pi3 and m92?but still short? Hv u try to remove emmc and check the short again?