Dell Precision 15 3551 Service Manual

Name: Dell Precision 15 3551
Brand: Dell
SKU: 7683612
Rating: 5 (3 reviews)

5 (3)

Dell Precision 3551

Service Manual

Regulatory Model: P80G

Regulatory Type: P80F004

Notes, cautions, and warnings

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

CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.

WARNING: A WARNING indicates a potential for property damage, personal injury, or death.

© 2020 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.

Rev. A00

Contents

1 Working on your computer............................................................................................................	6
Safety instructions.................................................................................................................................................................	6
Before working inside your computer...........................................................................................................................	6
Safety precautions...........................................................................................................................................................	7
Electrostatic discharge—ESD protection....................................................................................................................	7
ESD field service kit ........................................................................................................................................................	8
Transporting sensitive components..............................................................................................................................	8
After working inside your computer..............................................................................................................................	9
2 Technology and components........................................................................................................	10
DDR4......................................................................................................................................................................................	10
USB features.........................................................................................................................................................................	11
USB Type-C..........................................................................................................................................................................	13
HDMI 1.4- HDMI 2.0.............................................................................................................................................................	14
USB features........................................................................................................................................................................	15
Power button LED behavior................................................................................................................................................	17
3 Major components of your system................................................................................................	19
4 Disassembly and reassembly........................................................................................................	21
Base cover.............................................................................................................................................................................	21
Removing the base cover..............................................................................................................................................	21
Installing the base cover...............................................................................................................................................	24
Battery..................................................................................................................................................................................	27
Lithium-ion battery precautions...................................................................................................................................	27
Removing the battery...................................................................................................................................................	27
Installing the battery......................................................................................................................................................	29
Memory modules..................................................................................................................................................................	31
Removing the memory modules...................................................................................................................................	31
Installing the memory modules.....................................................................................................................................	32
WLAN card...........................................................................................................................................................................	34
Removing the WLAN card............................................................................................................................................	34
Installing the WLAN card..............................................................................................................................................	36
WWAN card.........................................................................................................................................................................	38
Removing the WWAN...................................................................................................................................................	38
Installing the WWAN.....................................................................................................................................................	40
Hard disk drive.....................................................................................................................................................................	42
Removing the Hard drive..............................................................................................................................................	42
Installing the Hard drive................................................................................................................................................	44
Coin-cell battery..................................................................................................................................................................	45
Removing the Coin-cell.................................................................................................................................................	45
Installing the Coin-cell...................................................................................................................................................	46
DC-in port.............................................................................................................................................................................	48
Removing the DC-in......................................................................................................................................................	48

Contents 3

Installing the DC-in........................................................................................................................................................	50
Solid-state drive...................................................................................................................................................................	52
Removing the SSD........................................................................................................................................................	52
Installing the SSD...........................................................................................................................................................	53
Inner frame...........................................................................................................................................................................	55
Removing the inner frame............................................................................................................................................	55
Installing the inner frame..............................................................................................................................................	58
Touchpad buttons................................................................................................................................................................	61
Touchpad buttons..........................................................................................................................................................	61
SmartCard reader................................................................................................................................................................	65
Removing the smart card reader board......................................................................................................................	65
Installing the smart card reader board........................................................................................................................	67
Touchpad buttons...............................................................................................................................................................	69
Removing the touchpad buttons.................................................................................................................................	69
Installing the touchpad buttons....................................................................................................................................	71
LED board.............................................................................................................................................................................	73
Removing the LED board..............................................................................................................................................	73
Installing the LED board................................................................................................................................................	75
Speakers................................................................................................................................................................................	77
Removing the speakers.................................................................................................................................................	77
Installing the speakers...................................................................................................................................................	79
Heatsink assembly-Discrete................................................................................................................................................	81
Removing the heatsink assembly-discrete..................................................................................................................	81
Installing the heatsink assembly-discrete...................................................................................................................	84
Heatsink assembly-UMA....................................................................................................................................................	86
Removing the heatsink assembly-UMA......................................................................................................................	86
Installing the heatsink assembly-UMA........................................................................................................................	88
System board........................................................................................................................................................................	91
Removing the system board.........................................................................................................................................	91
Installing the system board...........................................................................................................................................	94
Keyboard...............................................................................................................................................................................	97
Removing the Keyboard...............................................................................................................................................	97
Installing the Keyboard..................................................................................................................................................	99
Keyboard bracket...............................................................................................................................................................	101
Removing the keyboard bracket.................................................................................................................................	101
Installing the keyboard bracket..................................................................................................................................	103
Power button.....................................................................................................................................................................	105
Removing the power button with fingerprint reader..............................................................................................	105
Installing the power button with fingerprint.............................................................................................................	106
Display assembly................................................................................................................................................................	108
Removing the display assembly..................................................................................................................................	108
Installing the display assembly.....................................................................................................................................	113
Display bezel........................................................................................................................................................................	118
Removing the display bezel.........................................................................................................................................	118
Installing the display bezel...........................................................................................................................................	120
Hinge caps..........................................................................................................................................................................	122
Removing the hinge caps............................................................................................................................................	122
Installing the hinge caps..............................................................................................................................................	124
Display panel.......................................................................................................................................................................	126
Removing the display panel........................................................................................................................................	126

4 Contents

Installing the display panel...........................................................................................................................................	130
Palmrest assembly.............................................................................................................................................................	133
Removing the palm-rest and keyboard assembly....................................................................................................	133
Installing the palm-rest and keyboard assembly.......................................................................................................	134
5 Troubleshooting........................................................................................................................	137
Enhanced Pre-Boot System Assessment (ePSA) diagnostics.....................................................................................	137
Running the ePSA diagnostics....................................................................................................................................	137
System diagnostic lights....................................................................................................................................................	137
WiFi power cycle................................................................................................................................................................	138
6 Getting help.............................................................................................................................	139
Contacting Dell...................................................................................................................................................................	139

Contents 5

Working on your computer

Safety instructions

Prerequisites

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.

•A component can be replaced or, if purchased separately, installed by performing the removal procedure in reverse order.

About this task

NOTE: Disconnect all power sources before opening the computer cover or panels. After you finish working inside the computer, replace all covers, panels, and screws before connecting to the power source.

WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage

CAUTION: Many repairs may only be done by a certified service technician. You should only perform 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 tabs before you disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and aligned.

NOTE: The color of your computer and certain components may appear differently than shown in this document.

CAUTION: System will shut down if side covers are removed while the system is running. The system will not power on if the side cover is removed.

Before working inside your computer

About this task

To avoid damaging your computer, perform the following steps before you begin working inside the computer.

Steps

1.Ensure that you follow the safety precautions.

2.Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.

3.Turn off your computer.

4.Disconnect all network cables from the computer.

6 Working on your computer

CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from the network device.

5.Disconnect your computer and all attached devices from their electrical outlets.

6.Press and hold the power button while the computer is unplugged to ground the system board.

NOTE: 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.

Safety precautions

The safety precautions chapter details the primary steps to be taken before performing any disassembly instructions.

Observe the following safety precautions before you perform any installation or break/fix procedures involving disassembly or reassembly:

•Turn off the system and all attached peripherals.

•Disconnect the system and all attached peripherals from AC power.

•Disconnect all network cables, telephone, and telecommunications lines from the system.

•Use an ESD field service kit when working inside any tabletnotebookdesktop to avoid electrostatic discharge (ESD) damage.

•After removing any system component, carefully place the removed component on an anti-static mat.

•Wear shoes with non-conductive rubber soles to reduce the chance of getting electrocuted.

Standby power

Dell products with standby power must be unplugged before you open the case. Systems that incorporate standby power are essentially powered while turned off. The internal power enables the system to be remotely turned on (wake on LAN) and suspended into a sleep mode and has other advanced power management features.

Unplugging, pressing and holding the power button for 15 seconds should discharge residual power in the system board. Remove the battery from tablets.notebooks.

Bonding

Bonding is a method for connecting two or more grounding conductors to the same electrical potential. This is done through the use of a field service electrostatic discharge (ESD) kit. When connecting a bonding wire, ensure that it is connected to bare metal and never to a painted or non-metal surface. The wrist strap should be secure and in full contact with your skin, and ensure that you remove all jewelry such as watches, bracelets, or rings prior to bonding yourself and the equipment.

Electrostatic discharge—ESD protection

ESD is a major concern when you handle electronic components, especially sensitive components such as expansion cards, processors, memory DIMMs, and system boards. Very slight charges can damage circuits in ways that may not be obvious, such as intermittent problems or a shortened product life span. As the industry pushes for lower power requirements and increased density, ESD protection is an increasing concern.

Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.

Two recognized types of ESD damage are catastrophic and intermittent failures.

•Catastrophic – Catastrophic failures represent approximately 20 percent of ESD-related failures. The damage causes an immediate and complete loss of device functionality. An example of catastrophic failure is a memory DIMM that has received a static shock and immediately generates a "No POST/No Video" symptom with a beep code emitted for missing or nonfunctional memory.

•Intermittent – Intermittent failures represent approximately 80 percent of ESD-related failures. The high rate of intermittent failures means that most of the time when damage occurs, it is not immediately recognizable. The DIMM receives a static shock, but the tracing is merely weakened and does not immediately produce outward symptoms related to the damage. The weakened trace may take weeks or months to melt, and in the meantime may cause degradation of memory integrity, intermittent memory errors, etc.

The more difficult type of damage to recognize and troubleshoot is the intermittent (also called latent or "walking wounded") failure.

Perform the following steps to prevent ESD damage:

•Use a wired ESD wrist strap that is properly grounded. The use of wireless anti-static straps is no longer allowed; they do not provide adequate protection. Touching the chassis before handling parts does not ensure adequate ESD protection on parts with increased sensitivity to ESD damage.

•Handle all static-sensitive components in a static-safe area. If possible, use anti-static floor pads and workbench pads.

Working on your computer

•When unpacking a static-sensitive component from its shipping carton, do not remove the component from the anti-static packing material until you are ready to install the component. Before unwrapping the anti-static packaging, ensure that you discharge static electricity from your body.

•Before transporting a static-sensitive component, place it in an anti-static container or packaging.

ESD field service kit

The unmonitored Field Service kit is the most commonly used service kit. Each Field Service kit includes three main components: antistatic mat, wrist strap, and bonding wire.

Components of an ESD field service kit

The components of an ESD field service kit are:

•Anti-Static Mat – The anti-static mat is dissipative and parts can be placed on it during service procedures. When using an antistatic mat, your wrist strap should be snug and the bonding wire should be connected to the mat and to any bare metal on the system being worked on. Once deployed properly, service parts can be removed from the ESD bag and placed directly on the mat. ESDsensitive items are safe in your hand, on the ESD mat, in the system, or inside a bag.

•Wrist Strap and Bonding Wire – The wrist strap and bonding wire can be either directly connected between your wrist and bare metal on the hardware if the ESD mat is not required, or connected to the anti-static mat to protect hardware that is temporarily placed on the mat. The physical connection of the wrist strap and bonding wire between your skin, the ESD mat, and the hardware is known as bonding. Use only Field Service kits with a wrist strap, mat, and bonding wire. Never use wireless wrist straps. Always be aware that the internal wires of a wrist strap are prone to damage from normal wear and tear, and must be checked regularly with a wrist strap tester in order to avoid accidental ESD hardware damage. It is recommended to test the wrist strap and bonding wire at least once per week.

•ESD Wrist Strap Tester – The wires inside of an ESD strap are prone to damage over time. When using an unmonitored kit, it is a best practice to regularly test the strap prior to each service call, and at a minimum, test once per week. A wrist strap tester is the best method for doing this test. If you do not have your own wrist strap tester, check with your regional office to find out if they have one. To perform the test, plug the wrist-strap's bonding-wire into the tester while it is strapped to your wrist and push the button to test. A green LED is lit if the test is successful; a red LED is lit and an alarm sounds if the test fails.

•Insulator Elements – It is critical to keep ESD sensitive devices, such as plastic heat sink casings, away from internal parts that are insulators and often highly charged.

•Working Environment – Before deploying the ESD Field Service kit, assess the situation at the customer location. For example, deploying the kit for a server environment is different than for a desktop or portable environment. Servers are typically installed in a rack within a data center; desktops or portables are typically placed on office desks or cubicles. Always look for a large open flat work area that is free of clutter and large enough to deploy the ESD kit with additional space to accommodate the type of system that is being repaired. The workspace should also be free of insulators that can cause an ESD event. On the work area, insulators such as Styrofoam and other plastics should always be moved at least 12 inches or 30 centimeters away from sensitive parts before physically handling any hardware components

•ESD Packaging – All ESD-sensitive devices must be shipped and received in static-safe packaging. Metal, static-shielded bags are preferred. However, you should always return the damaged part using the same ESD bag and packaging that the new part arrived in. The ESD bag should be folded over and taped shut and all the same foam packing material should be used in the original box that the new part arrived in. ESD-sensitive devices should be removed from packaging only at an ESD-protected work surface, and parts should never be placed on top of the ESD bag because only the inside of the bag is shielded. Always place parts in your hand, on the ESD mat, in the system, or inside an anti-static bag.

•Transporting Sensitive Components – When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport.

ESD protection summary

It is recommended that all field service technicians use the traditional wired ESD grounding wrist strap and protective anti-static mat at all times when servicing Dell products. In addition, it is critical that technicians keep sensitive parts separate from all insulator parts while performing service and that they use anti-static bags for transporting sensitive components.

Transporting sensitive components

When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport.

Lifting equipment

Adhere to the following guidelines when lifting heavy weight equipment:

8 Working on your computer

CAUTION: Do not lift greater than 50 pounds. Always obtain additional resources or use a mechanical lifting device.

1.Get a firm balanced footing. Keep your feet apart for a stable base, and point your toes out.

2.Tighten stomach muscles. Abdominal muscles support your spine when you lift, offsetting the force of the load.

3.Lift with your legs, not your back.

4.Keep the load close. The closer it is to your spine, the less force it exerts on your back.

5.Keep your back upright, whether lifting or setting down the load. Do not add the weight of your body to the load. Avoid twisting your body and back.

6.Follow the same techniques in reverse to set the load down.

After working inside your computer

About this task

After you complete any replacement procedure, ensure that you connect any external devices, cards, and cables before turning on your computer.

Steps

1.Connect any telephone or network cables to your computer.

CAUTION: To connect a network cable, first plug the cable into the network device and then plug it into the computer.

2.Connect your computer and all attached devices to their electrical outlets.

3.Turn on your computer.

4.If required, verify that the computer works correctly by running the diagnostic tool.

Working on your computer

Technology and components

NOTE: Instructions provided in this section are applicable on computers shipped with Windows 10 operating system. Windows 10 is factory-installed with this computer.

Topics:

•DDR4

•USB features

•USB Type-C

•HDMI 1.4- HDMI 2.0

•USB features

•Power button LED behavior

DDR4

DDR4 (double data rate fourth generation) memory is a higher-speed successor to the DDR2 and DDR3 technologies and allows up to 512 GB in capacity, compared to the DDR3's maximum of 128 GB per DIMM. DDR4 synchronous dynamic random-access memory is keyed differently from both SDRAM and DDR to prevent the user from installing the wrong type of memory into the system.

DDR4 needs 20 percent less or just 1.2 volts, compared to DDR3 which requires 1.5 volts of electrical power to operate. DDR4 also supports a new, deep power-down mode that allows the host device to go into standby without needing to refresh its memory. Deep power-down mode is expected to reduce standby power consumption by 40 to 50 percent.

DDR4 Details

There are subtle differences between DDR3 and DDR4 memory modules, as listed below.

Key notch difference

The key notch on a DDR4 module is in a different location from the key notch on a DDR3 module. Both notches are on the insertion edge but the notch location on the DDR4 is slightly different, to prevent the module from being installed into an incompatible board or platform.

Figure 1. Notch difference

Increased thickness

DDR4 modules are slightly thicker than DDR3, to accommodate more signal layers.

10 Technology and components

Figure 2. Thickness difference

Curved edge

DDR4 modules feature a curved edge to help with insertion and alleviate stress on the PCB during memory installation.

Figure 3. Curved edge

Memory Errors

Memory errors on the system display the new ON-FLASH-FLASH or ON-FLASH-ON failure code. If all memory fails, the LCD does not turn on. Troubleshoot for possible memory failure by trying known good memory modules in the memory connectors on the bottom of the system or under the keyboard, as in some portable systems.

NOTE: The DDR4 memory is imbedded in board and not a replaceable DIMM as shown and referred.

USB features

Universal Serial Bus, or USB, was introduced in 1996. It dramatically simplified the connection between host computers and peripheral devices like mice, keyboards, external drivers, and printers.

Table 1. USB evolution
Type	Data Transfer Rate	Category	Introduction Year

USB 2.0	480 Mbps	High Speed	2000
USB 3.0/USB 3.1 Gen 1	5 Gbps	SuperSpeed	2010
Port
USB 3.1 Gen 2	10 Gbps	SuperSpeed	2013

USB 3.0/USB 3.1 Gen 1 (SuperSpeed USB)

For years, the USB 2.0 has been firmly entrenched as the de facto interface standard in the PC world with about 6 billion devices sold, and yet the need for more speed grows by ever faster computing hardware and ever greater bandwidth demands. The USB 3.0/USB 3.1 Gen 1 finally has the answer to the consumers' demands with a theoretically 10 times faster than its predecessor. In a nutshell, USB 3.1 Gen 1 features are as follows:

•Higher transfer rates (up to 5 Gbps)

•Increased maximum bus power and increased device current draw to better accommodate power-hungry devices

•New power management features

•Full-duplex data transfers and support for new transfer types

Technology and components

•Backward USB 2.0 compatibility

•New connectors and cable

The topics below cover some of the most commonly asked questions regarding USB 3.0/USB 3.1 Gen 1.

Speed

Currently, there are 3 speed modes defined by the latest USB 3.0/USB 3.1 Gen 1 specification. They are Super-Speed, Hi-Speed and FullSpeed. The new SuperSpeed mode has a transfer rate of 4.8 Gbps. While the specification retains Hi-Speed, and Full-Speed USB mode, commonly known as USB 2.0 and 1.1 respectively, the slower modes still operate at 480 Mbps and 12 Mbps respectively and are kept to maintain backward compatibility.

USB 3.0/USB 3.1 Gen 1 achieves the much higher performance by the technical changes below:

•An additional physical bus that is added in parallel with the existing USB 2.0 bus (refer to the picture below).

•USB 2.0 previously had four wires (power, ground, and a pair for differential data); USB 3.0/USB 3.1 Gen 1 adds four more for two pairs of differential signals (receive and transmit) for a combined total of eight connections in the connectors and cabling.

•USB 3.0/USB 3.1 Gen 1 utilizes the bidirectional data interface, rather than USB 2.0's half-duplex arrangement. This gives a 10-fold increase in theoretical bandwidth.

With today's ever increasing demands placed on data transfers with high-definition video content, terabyte storage devices, high megapixel count digital cameras etc., USB 2.0 may not be fast enough. Furthermore, no USB 2.0 connection could ever come close to the 480Mbps theoretical maximum throughput, making data transfer at around 320 Mbps (40 MB/s) — the actual real-world maximum. Similarly, USB 3.0/USB 3.1 Gen 1 connections will never achieve 4.8Gbps. We will likely see a real-world maximum rate of 400MB/s with overheads. At this speed, USB 3.0/USB 3.1 Gen 1 is a 10x improvement over USB 2.0.

Applications

USB 3.0/USB 3.1 Gen 1 opens up the laneways and provides more headroom for devices to deliver a better overall experience. Where USB video was barely tolerable previously (both from a maximum resolution, latency, and video compression perspective), it's easy to imagine that with 5-10 times the bandwidth available, USB video solutions should work that much better. Single-link DVI requires almost 2Gbps throughput. Where 480Mbps was limiting, 5Gbps is more than promising. With its promised 4.8Gbps speed, the standard will find its way into some products that previously weren't USB territory, like external RAID storage systems.

Listed below are some of the available SuperSpeed USB 3.0/USB 3.1 Gen 1 products:

•External Desktop USB 3.0/USB 3.1 Gen 1 Hard Drives

•Portable USB 3.0/USB 3.1 Gen 1 Hard Drives

•USB 3.0/USB 3.1 Gen 1 Drive Docks & Adapters

•USB 3.0/USB 3.1 Gen 1 Flash Drives & Readers

•USB 3.0/USB 3.1 Gen 1 Solid-state Drives

•USB 3.0/USB 3.1 Gen 1 RAIDs

12 Technology and components

•Optical Media Drives

•Multimedia Devices

•Networking

•USB 3.0/USB 3.1 Gen 1 Adapter Cards & Hubs

Compatibility

The good news is that USB 3.0/USB 3.1 Gen 1 has been carefully planned from the start to peacefully co-exist with USB 2.0. First of all, while USB 3.0/USB 3.1 Gen 1 specifies new physical connections and thus new cables to take advantage of the higher speed capability of the new protocol, the connector itself remains the same rectangular shape with the four USB 2.0 contacts in the exact same location as before. Five new connections to carry receive and transmitted data independently are present on USB 3.0/USB 3.1 Gen 1 cables and only come into contact when connected to a proper SuperSpeed USB connection.

USB Type-C

USB Type-C is a new, tiny physical connector. The connector itself can support various exciting new USB standards like USB 3.1 and USB power delivery (USB PD).

Alternate Mode

USB Type-C is a new connector standard that is very small. It is about a third the size of an old USB Type-A plug. This is a single connector standard that every device should be able to use. USB Type-C ports can support a variety of different protocols using “alternate modes,” which allows you to have adapters that can output HDMI, VGA, DisplayPort, or other types of connections from that single USB port

USB Power Delivery

The USB PD specification is also closely intertwined with USB Type-C. Currently, smartphones, tablets, and other mobile devices often use a USB connection to charge. A USB 2.0 connection provides up to 2.5 watts of power — that'll charge your phone, but that's about it. A laptop might require up to 60 watts, for example. The USB Power Delivery specification ups this power delivery to 100 watts. It's bidirectional, so a device can either send or receive power. And this power can be transferred at the same time the device is transmitting data across the connection.

This could spell the end of all those proprietary laptop charging cables, with everything charging via a standard USB connection. You could charge your laptop from one of those portable battery packs you charge your smartphones and other portable devices from today. You could plug your laptop into an external display connected to a power cable, and that external display would charge your laptop as you used it as an external display — all via the one little USB Type-C connection. To use this, the device and the cable have to support USB Power Delivery. Just having a USB Type-C connection doesn't necessarily mean they do.

USB Type-C and USB 3.1

USB 3.1 is a new USB standard. USB 3's theoretical bandwidth is 5 Gbps, while USB 3.1's is 10 Gbps. That's double the bandwidth, as fast as a first-generation Thunderbolt connector. USB Type-C isn't the same thing as USB 3.1. USB Type-C is just a connector shape, and the underlying technology could just be USB 2 or USB 3.0. In fact, Nokia's N1 Android tablet uses a USB Type-C connector, but underneath it's all USB 2.0 — not even USB 3.0. However, these technologies are closely related.

Thunderbolt over USB Type-C

Thunderbolt is a hardware interface that combines data, video, audio, and power in a single connection. Thunderbolt combines PCI Express (PCIe) and DisplayPort (DP) into one serial signal, and additionally provides DC power, all in one cable. Thunderbolt 1 and Thunderbolt 2 use the same connector as miniDP (DisplayPort) to connect to peripherals, while Thunderbolt 3 uses a USB Type-C connector.

Technology and components

Figure 4. Thunderbolt 1 and Thunderbolt 3

1.Thunderbolt 1 and Thunderbolt 2 (using a miniDP connector)

2.Thunderbolt 3 (using a USB Type-C connector)

Thunderbolt 3 over USB Type-C

Thunderbolt 3 brings Thunderbolt to USB Type-C at speeds up to 40 Gbps, creating one compact port that does it all - delivering the fastest, most versatile connection to any dock, display or data device like an external hard drive. Thunderbolt 3 uses a USB Type-C connector/port to connect to supported peripherals.

1.Thunderbolt 3 uses USB Type-C connector and cables - It is compact and reversible

2.Thunderbolt 3 supports speed up to 40 Gbps

3.DisplayPort 1.4 – compatible with existing DisplayPort monitors, devices and cables

4.USB Power Delivery - Up to 130W on supported computers

Key Features of Thunderbolt 3 over USB Type-C

1.Thunderbolt, USB, DisplayPort and power on USB Type-C on a single cable (features vary between different products)

2.USB Type-C connector and cables which are compact and reversible

3.Supports Thunderbolt Networking (*varies between different products)

4.Supports up to 4K displays

5.Up to 40 Gbps

NOTE: Data transfer speed may vary between different devices.

Thunderbolt Icons

Figure 5. Thunderbolt Iconography Variations

HDMI 1.4- HDMI 2.0

This topic explains the HDMI 1.4/2.0 and its features along with the advantages.

HDMI (High-Definition Multimedia Interface) is an industry-supported, uncompressed, all-digital audio/video interface. HDMI provides an interface between any compatible digital audio/video source, such as a DVD player, or A/V receiver and a compatible digital audio and/or video monitor, such as a digital TV (DTV). The intended applications for HDMI TVs, and DVD players. The primary advantage is cable reduction and content protection provisions. HDMI supports standard, enhanced, or high-definition video, plus multichannel digital audio on a single cable.

14 Technology and components

NOTE: The HDMI 1.4 will provide 5.1 channel audio support.

HDMI 1.4- HDMI 2.0 Features

•HDMI Ethernet Channel - Adds high-speed networking to an HDMI link, allowing users to take full advantage of their IP-enabled devices without a separate Ethernet cable

•Audio Return Channel - Allows an HDMI-connected TV with a built-in tuner to send audio data "upstream" to a surround audio system, eliminating the need for a separate audio cable

•3D - Defines input/output protocols for major 3D video formats, paving the way for true 3D gaming and 3D home theater applications

•Content Type - Real-time signaling of content types between display and source devices, enabling a TV to optimize picture settings based on content type

•Additional Color Spaces - Adds support for additional color models used in digital photography and computer graphics

•4K Support - Enables video resolutions far beyond 1080p, supporting next-generation displays that will rival the Digital Cinema systems used in many commercial movie theaters

•HDMI Micro Connector - A new, smaller connector for phones and other portable devices, supporting video resolutions up to 1080p

•Automotive Connection System - New cables and connectors for automotive video systems, designed to meet the unique demands of the motoring environment while delivering true HD quality

Advantages of HDMI

•Quality HDMI transfers uncompressed digital audio and video for the highest, crispest image quality.

•Low -cost HDMI provides the quality and functionality of a digital interface while also supporting uncompressed video formats in a simple, cost-effective manner

•Audio HDMI supports multiple audio formats from standard stereo to multichannel surround sound

•HDMI combines video and multichannel audio into a single cable, eliminating the cost, complexity, and confusion of multiple cables currently used in A/V systems

•HDMI supports communication between the video source (such as a DVD player) and the DTV, enabling new functionality

USB features

Universal Serial Bus, or USB, was introduced in 1996. It dramatically simplified the connection between host computers and peripheral devices like mice, keyboards, external drivers, and printers.

Let's take a quick look on the USB evolution referencing to the table below.

Table 2.	USB evolution

Type		Data Transfer Rate	Category	Introduction Year

USB 2.0		480 Mbps	High Speed	2000

USB 3.0/USB 3.1 Gen 1		5 Gbps	Super Speed	2010

USB 3.1	Gen 2	10 Gbps	Super Speed	2013

USB 3.0/USB 3.1 Gen 1 (SuperSpeed USB)

•Higher transfer rates (up to 5 Gbps)

•Increased maximum bus power and increased device current draw to better accommodate power-hungry devices

•New power management features

•Full-duplex data transfers and support for new transfer types

•Backward USB 2.0 compatibility

•New connectors and cable

The topics below cover some of the most commonly asked questions regarding USB 3.0/USB 3.1 Gen 1.

Technology and components

Speed

Currently, there are 3 speed modes defined by the latest USB 3.0/USB 3.1 Gen 1 specification. They are Super-Speed, Hi-Speed and FullSpeed. The new SuperSpeed mode has a transfer rate of 4.8Gbps. While the specification retains Hi-Speed, and Full-Speed USB mode, commonly known as USB 2.0 and 1.1 respectively, the slower modes still operate at 480Mbps and 12Mbps respectively and are kept to maintain backward compatibility.

USB 3.0/USB 3.1 Gen 1 achieves the much higher performance by the technical changes below:

•An additional physical bus that is added in parallel with the existing USB 2.0 bus (refer to the picture below).

•USB 3.0/USB 3.1 Gen 1 utilizes the bidirectional data interface, rather than USB 2.0's half-duplex arrangement. This gives a 10-fold increase in theoretical bandwidth.

With today's ever increasing demands placed on data transfers with high-definition video content, terabyte storage devices, high megapixel count digital cameras etc., USB 2.0 may not be fast enough. Furthermore, no USB 2.0 connection could ever come close to the 480Mbps theoretical maximum throughput, making data transfer at around 320Mbps (40MB/s) — the actual real-world maximum. Similarly, USB 3.0/USB 3.1 Gen 1 connections will never achieve 4.8Gbps. We will likely see a real-world maximum rate of 400MB/s with overheads. At this speed, USB 3.0/USB 3.1 Gen 1 is a 10x improvement over USB 2.0.

Applications

Listed below are some of the available SuperSpeed USB 3.0/USB 3.1 Gen 1 products:

•External Desktop USB 3.0/USB 3.1 Gen 1 Hard Drives

•Portable USB 3.0/USB 3.1 Gen 1 Hard Drives

•USB 3.0/USB 3.1 Gen 1 Drive Docks & Adapters

•USB 3.0/USB 3.1 Gen 1 Flash Drives & Readers

•USB 3.0/USB 3.1 Gen 1 Solid-state Drives

•USB 3.0/USB 3.1 Gen 1 RAIDs

•Optical Media Drives

•Multimedia Devices

•Networking

•USB 3.0/USB 3.1 Gen 1 Adapter Cards & Hubs

16 Technology and components

Compatibility

Windows 10 will be bringing native support for USB 3.1 Gen 1 controllers. This is in contrast to previous versions of Windows, which continue to require separate drivers for USB 3.0/USB 3.1 Gen 1 controllers.

Power button LED behavior

On certain Dell Latitude systems, the power button LED is used to provide an indication of the system status, and as a result the power button illuminates when pressed. The systems with the optional power button/fingerprint reader will have no LED under the power button and hence will apply the available LED's in the system to provide an indication of the system status.

Power button LED behavior without Fingerprint reader

•System is ON (S0) = LED illuminates solid white.

•System in Sleep/Standby (S3, SOix) = LED is off

•System is Off/Hibernating (S4/S5) = LED is off

Power On and LED behavior with Fingerprint reader

•Pressing the power button for a duration between 50 msec to 2 sec turns on the device.

•Power button does not register additional presses until the SOL (Sign-Of-Life) has been provided to the user.

•System LED's illuminates upon pressing the power button.

•All the available LED's (Keyboard backlit/ Keyboard caps lock LED/ Battery Charge LED) illuminates and displays specified behavior.

•The auditory tone is Off by default. It can be enabled in the BIOS setup.

•Safeguards do not time out if the device gets hung during the logon process.

•Dell logo: Turns on within 2 secs after pressing the power button.

•Full boot: Within 22 secs after pressing the power button.

•Below is the example timelines:

Technology and components

Power button with fingerprint reader will have no LED and will leverage the available LED's in the system to provide indication of the system status

•Power Adapter LED:

•The LED on Power adapter connector illuminates white when power is supplied from electrical outlet.

•Battery Indicator LED:

•If the computer is connected to an electrical outlet, the battery light operates as follows:

1.Solid white -the battery is charging. When the charge is complete the LED turns off.

•If the computer is running on a battery, the battery light operates as follows:

1.Off -the battery is adequately charged (or the computer is turned off).

2.Solid amber -the battery charge is critically low. A low battery state is approximately 30 minutes or less of battery life remaining.

•Camera LED

•White LED activates when camera is on.

•Mic Mute LED:

•When activated (muted), the mic mute LED on the F4 Key should illuminate WHITE.

•RJ45 LEDs:

•Table 3. LED on either side of RJ45 port

Link speed indicator (LHS)	Activity indicator (RHS)

Green	Amber

18 Technology and components

Major components of your system

1.Base cover

2.DC-in metal bracket

Major components of your system

3.DC-in port

4.Heatsink assembly

5.Heatsink fan

6.Memory modules

7.Inner frame

8.Memory module slot

9.Keyboard

10.Keyboard bracket

11.Battery

12.SmartCard reader

13.Speakers

14.Touchpad buttons

15.Display assembly

16.Palmrest assembly

17.Solid state drive

18.SSD thermal plate

19.Coin-cell battery

20.WWAN card

NOTE: Dell provides a list of components and their part numbers for the original system configuration purchased. These parts are available according to warranty coverages purchased by the customer. Contact your Dell sales representative for purchase options.

20 Major components of your system

Disassembly and reassembly

Base cover

Removing the base cover

Prerequisites

1. Follow the procedure in Before working inside your computer.

About this task

The figure indicates the location of the base cover and provides a visual representation of the removal procedure.

Disassembly and reassembly

22 Disassembly and reassembly

Disassembly and reassembly

Steps

1.Remove the five (M2.5x6.3) and three (M2.5x8) captive screws that secure the base cover to the computer.

2.Pry the base cover starting from the right hinge and work your way around.

3.Lift the base cover away from the computer.

Installing the base cover

Prerequisites

If you are replacing a component, remove the existing component before performing the installation procedure.

About this task

The figure indicates the location of the base cover and provides a visual representation of the installation procedure.

24 Disassembly and reassembly

Disassembly and reassembly

26 Disassembly and reassembly

Steps

1.Place the base cover on the palm-rest and keyboard assembly, and snap the base cover into place.

2.Replace the five (M2.5x6.3) and three (M2.5x8) captive screws to secure the base cover to the computer.

Next steps

1. Follow the procedure in After working inside your computer.

Battery

Lithium-ion battery precautions

CAUTION:

•Exercise caution when handling Lithium-ion batteries.

•Discharge the battery as much as possible before removing it from the system. This can be done by disconnecting the AC adapter from the system to allow the battery to drain.

•Do not crush, drop, mutilate, or penetrate the battery with foreign objects.

•Do not expose the battery to high temperatures, or disassemble battery packs and cells.

•Do not apply pressure to the surface of the battery.

•Do not bend the battery.

•Do not use tools of any kind to pry on or against the battery.

•Ensure any screws during the servicing of this product are not lost or misplaced, to prevent accidental puncture or damage to the battery and other system components.

•If the battery gets stuck inside your computer as a result of swelling, do not try to release it as puncturing, bending, or crushing a lithium-ion battery can be dangerous. In such an instance, contact Dell technical support for assistance. See www.dell.com/contactdell.

•Always purchase genuine batteries from www.dell.com or authorized Dell partners and resellers.

Removing the battery

Prerequisites

1.Follow the procedure in Before working inside your computer.

2.Remove the base cover.

About this task

The figure indicates the location of the battery and provides a visual representation of the removal procedure.

Disassembly and reassembly

Steps

1. Disconnect the battery cable from the system board.

28 Disassembly and reassembly

2.Remove the single (M2x6) captive screw that secures the battery computer.

3.Lift the battery off the computer.

Installing the battery

Prerequisites

If you are replacing a component, remove the existing component before performing the installation procedure.

About this task

The figure indicates the location of the battery and provides a visual representation of the installation procedure.

Disassembly and reassembly

30 Disassembly and reassembly

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