Dell OptiPlex 5055 Small Form Factor

Owner's Manual

Regulatory Model: D11S

Regulatory Type: D11S003

June 2020

Rev. A01

Chapter 1: Working on your computer........................................................................................... 6

Safety instructions.............................................................................................................................................................. 6

Turning off your computer................................................................................................................................................ 6

Chapter 3: Disassembly and reassembly.......................................................................................10

Back cover...........................................................................................................................................................................10

Removing cover............................................................................................................................................................10

Installing cover.............................................................................................................................................................. 12

Front Bezel.......................................................................................................................................................................... 12

Removing the front bezel...........................................................................................................................................12

Installing front bezel.................................................................................................................................................... 13

Storage device....................................................................................................................................................................13

Removing 2.5–inch hard drive assembly................................................................................................................13

Removing 2.5–inch hard drive from the hard drive bracket............................................................................. 15

Removing the cooling shroud.................................................................................................................................... 18

Installing cooling shroud.............................................................................................................................................20

Coin-cell battery................................................................................................................................................................ 20

Removing coin cell battery........................................................................................................................................20

Installing coin cell battery...........................................................................................................................................21

Optical drive........................................................................................................................................................................ 21

Removing optical drive................................................................................................................................................21

Installing optical drive................................................................................................................................................. 23

M.2 PCIe SSD.....................................................................................................................................................................23

Removing M.2 PCIe SSD........................................................................................................................................... 23

Installing the processor..............................................................................................................................................26

Contents

2 Contents

Intrusion switch..................................................................................................................................................................27

Removing intrusion switch........................................................................................................................................ 27

Installing intrusion switch.......................................................................................................................................... 28

Memory modules............................................................................................................................................................... 28

Removing memory module........................................................................................................................................ 28

Installing memory module.......................................................................................................................................... 29

VGA Daughterboard..........................................................................................................................................................29

Removing power supply unit — PSU...................................................................................................................... 31

Installing power supply unit — PSU....................................................................................................................... 33

Power switch......................................................................................................................................................................33

Removing power switch.............................................................................................................................................33

Installing power switch...............................................................................................................................................34

Speaker................................................................................................................................................................................ 35

Removing speaker....................................................................................................................................................... 35

Installing speaker......................................................................................................................................................... 35

System board..................................................................................................................................................................... 36

Removing the system board..................................................................................................................................... 36

AMD APUs, AMD Ryzen CPUs and APUs...................................................................................................................43

AMD Advanced Processing Unit - APU................................................................................................................. 43

AMD Ryzen................................................................................................................................................................... 43

AMD Ryzen APUs........................................................................................................................................................44

AMD PT B350.................................................................................................................................................................... 44

AMD Radeon R7 M450.................................................................................................................................................... 44

AMD Radeon R5 M430.................................................................................................................................................... 45

USB features...................................................................................................................................................................... 45

DDR4.....................................................................................................................................................................................47

Active State Power Management................................................................................................................................. 48

Updating the Dell BIOS in Linux and Ubuntu environments................................................................................... 56

Flashing the BIOS from the F12 One-Time boot menu............................................................................................ 57

Contents

3

Specifications.....................................................................................................................................................................60

Chapter 6: Troubleshooting.........................................................................................................65

Diagnostic and Power LED codes................................................................................................................................. 65

Enhanced Pre-Boot System Assessment — ePSA diagnostics............................................................................ 69

Chapter 7: Getting help................................................................................................................71

Contacting Dell................................................................................................................................................................... 71

4 Contents

Notes, cautions, and warnings

NOTE: A NOTE indicates important information that helps you make better use of your product.

• Safety instructions

Turning off your computer

• Before working inside your computer

• After working inside your computer

Use the following safety guidelines to protect your computer from potential damage and to ensure your personal safety. Unless

otherwise noted, each procedure included in this document assumes that the following conditions exist:

● You have read the safety information that shipped with your computer.

troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or

telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by

your warranty. Read and follow the safety instructions that came with the product.

CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically

touching an unpainted metal surface at the same time as touching a connector on the back of the computer.

CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a

card by its edges or by its metal mounting bracket. Hold a component such as a processor by its edges, not by

its pins.

CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some

cables have connectors with locking tabs; if you are disconnecting this type of cable, press in on the locking

CAUTION:

computer .

6 Working on your computer

1. Click or tap .

2. Click or tap and then click or tap Shut down.

7

• Front chassis view

Back chassis view