Dell 2130cn Service Manual page 544

Chapter 3 Removal and Replacement Procedures (RRPs)
18) Remove the one screw (silver, 4mm)
that fixes the USB connector of the PWBA
ESS to the PLATE IF.
19) Remove the two screws (silver, 6mm)
that fix the PWBA ESS to the PLATE IF,
remove the PWBA ESS from the PLATE
IF.
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