HP E27m G4 Manual

Maintenance and Service Guide
E27m G4 model
SUMMARY
This guide provides information about spare parts, removal and replacement of parts, diagnostic tests, problem
troubleshooting, and more.

© Copyright 2021 HP Development
Company, L.P.
AMD is a trademark of Advanced Micro
Devices, Inc. Bluetooth is a trademark
owned by its proprietor and used by HP
Inc. under license. NVIDIA is a trademark
and/or registered trademark of NVIDIA
Corporation in the U.S. and other
countries. USB Type-C and USB-C are
registered trademarks of USB
Implementers Forum. DisplayPort and the
DisplayPort logo are trademarks owned
by the Video Electronics Standards
Association (VESA) in the United States
and other countries.
The information contained herein is
subject to change without notice. The
only warranties for HP products and
services are set forth in the express
warranty statements accompanying such
products and services. Nothing herein
should be construed as constituting an
additional warranty. HP shall not be liable
for technical or editorial errors or
omissions contained herein.
First Edition: October 2021
Document Part Number: M56188-E27m
G4-MSG-V1
Assembly part number: M56188-001
Product notice
Only trained service personnel familiar with
this product should service it. Before
performing any maintenance or service, be
sure to read “Important Safety Information”.

1
Table of Contents
1Getting started….……………………………………………………………………………………………………………...2
Important safety information ................................................................................................................................ 2
Important service information and precautions..................................................................................................... 2
RoHS (2002/95/EC) requirements ....................................................................................................................... 3
General descriptions ............................................................................................................................................ 3
Firmware updates ................................................................................................................................................ 3
Before returning the repaired product to the customer........................................................................................ 3
2Monitor features……………………………………………………………………………………………………………….4
Features............................................................................................................................................................... 4
Front components ................................................................................................................................................ 6
Rear components................................................................................................................................................. 6
Locating the serial number and product number ................................................................................................. 9
3Illustrated parts catalog……………………………………………………………………………………………………..11
How to order parts ............................................................................................................................................. 13
4Removal and replacement procedures………………………….. ………………….. …………………….. …………. 14
Preparation for disassembly .............................................................................................................................. 14
Rear Cover......................................................................................................................................................... 14
Power board....................................................................................................................................................... 17
Connector repair ................................................................................................................................................ 17
Audio connector CN610 .......................................................................................................................... 20
HDMI connector CN501 .......................................................................................................................... 20
DP connector CN502............................................................................................................................... 21
DP connector CN503............................................................................................................................... 21
TYPE-C connector CN101 ...................................................................................................................... 22
RJ45 connector CN105 ........................................................................................................................... 23
USB3.0 connector CN103 ....................................................................................................................... 23
USB 3.0 connector CN1032&CN1033 .................................................................................................... 23
Function test ...................................................................................................................................................... 25
Support and troubleshooting.............................................................................................................................. 25
Index .................................................................................................................................................................. 27

2
1 Getting started
Read this chapter to learn about safety information and where to find additional HP resources.
Important safety information
Carefully read the cautions and notes within this document to minimize the risk of personal injury to
service personnel. The cautions and notes are not exhaustive. Proper service methods are important to
the safe, reliable operation of equipment. Improper service methods can damage equipment.
The service procedures recommended and described in this service manual provide effective methods of
performing service operations. Service engineers should have prior repair knowledge and experience as
well as appropriate training for the product before performing service procedures.
●Be sure your working environment is dry and clean and meets all government safety
requirements.
●Be sure that other persons are safe while you are servicing the product.
●Do not perform any action that can cause a hazard to the customer or make the product unsafe.
●Use proper safety devices to ensure your personal safety.
●Always use approved tools and test equipment for servicing.
●Never assume the product’s power is disconnected from the main power supply. Check that it
is disconnected before opening the product’s cabinet.
●Modules containing electrical components are sensitive to electrostatic discharge (ESD).
Follow ESD safety procedures while handling these parts.
●Some products contain more than one battery. Do not disassemble or expose a battery to high
temperatures, such as throwing into fire, or the battery may explode.
●Refer to government requirements for battery recycling or disposal.
This information provides general service information for the monitor. Adherence to the
procedures and precautions is essential for proper service.
IMPORTANT: Only trained service personnel who are familiar with this HP product should perform service
or maintenance for it. Before performing any service or maintenance, personnel must read the important
safety information.
IMPORTANT: You must disconnect the power cord from the power source before opening the monitor
to prevent component damage.
Important service information and precautions
●Repair must be performed by professional service technicians in a repair center. End users
should not perform these procedures.
●Please note during servicing that the primary side is the high voltage area.
●This monitor meets ROHS requirements. Be sure to use lead-free solder wire when soldering.
●If you must change a capacitor, be sure to match the polarity as printed on the PCB.
●If you must replace a capacitor, make sure the specification and part number match the BOM
and location.
●If you must replace a capacitor, insert new parts carefully to avoid a short circuit caused by the

3
near pin.
●Do not get the board wet. Water and moisture can cause a short circuit that causes
malfunctions.
●To avoid damage, be sure to use lead-free solder.
●When soldering, work quickly to avoid overheating the circuit board.
●Keep the soldering iron tip clean and well tinned when replacing parts.
●After repair, perform a close inspection of the circuit board to confirm it is in good condition.
●After repair, perform a function test to confirm the power supply is working properly.
ERP Lot5 requirement
1. A professional repairer must have the technical competence to repair electronic displays and
comply with the applicable regulations for repairers of electrical equipment in the Member States
where the repairer operates. Reference to an official registration system as professional repairer,
where such a system exists in the Member States, shall be accepted as proof of compliance.
2. A professional repairer must have insurance that covers liabilities resulting from repairs,
regardless of whether required by the Member State.
RoHS (2002/95/EC) requirements
Applied to all countries that require RoHS.
The RoHS (Restriction of Hazardous Substance in Electrical and Electronic Equipment Directive) is a
legal requirement by the EU (European Union) for the global electronics industry sold in the EU and
other countries. Any electrical and electronics products launched in the market after June 2006 should
meet this RoHS requirement. Products launched in the market before June 2006 are not required to be
compliant with RoHS parts. If the original parts are not RoHS complaint, the replacement parts can be
non-ROHS complaint. If the original parts are RoHS compliant, the replacement parts MUST be RoHS
complaint.
If product service or maintenance requires replacing parts, confirm the RoHS requirement before
replacement.
General descriptions
This manual contains general information. There are two levels of service:
Level 1: Cosmetic/appearance/alignment service
Level 2: Circuit board or standard parts replacement
Firmware updates
Firmware updates for the monitor are available at support.hp.com. If no firmware is posted, the monitor
does not need a firmware update.
Before returning the repaired product to the customer
Perform an AC leakage current check on exposed metallic parts to be sure the product is safe to
operate without the potential of electrical shock. Do not use a line isolation transformer during this
check.
Measurements that are not within specified limits present a possible shock hazard. You must check and
repair the product before returning it to the customer.

4
2 Monitor features
This chapter provides an overview of the monitor’s features.
Features
Depending on the model, your monitor might include the following features:
●68.6cm (27inch) diagonal viewable screen area with 2560x1400 resolution, plus fullscreen support
for lower resolutions; includes custom scaling for maximum image size while preserving
original aspect ratio
●Wide color gamut to provide coverage of NTSC color spaces
●Nonglare panel with an LED backlight
●Antiglare panel with an LED backlight
●Wide viewing angle to allow viewing from a sitting or standing position, or moving from side to
side
●Tilt, swivel and height adjustment capabilities for 23.8 and 27" monitor
●Pivot capability to rotate the monitor head from landscape to portrait orientation for 23.8 and 27”
monitor
●Menu button and three onscreen display (OSD) buttons, three that you can reconfigure to
quickly allow selection of the most commonly used operations
●Onscreen display (OSD) adjustments in several languages for easy setup and screen
optimization
●Embedded 5w SPK per side in monitor
●Popup camera and microphone for online collaboration
●Energy saver feature to meet requirements for reduced power consumption
●Security cable slot on the rear of the monitor for an optional security cable
●Cable management feature for placement of cables and cords connector
●DisplayPort™ video input
●High-Definition Multimedia Interface™ (HDMI) video input (cable included)
●Audi-out (headphone) port on side
●USB hub with one USB Type C port that connects to the computer (upstream) and four USB
ports that connect to USB devices (downstream). 1 of side USBA support BC1.2(1.5A)
●Ethernet jack
●USB Type C ports that provides network, data, video and power delivery(up to 65w)
●Plug and Play capability, if supported by your operating system Monitor stand
●Removable stand for flexible monitor head mounting solutions
●HP Quick Release 2 device to quickly attach the monitor head to the stand with a simple click,
and then remove it with the convenient sliding tab release

5
●VESA® mounting bracket for attaching the monitor head to a wall mount device or swing arm
●VESA mounting capability (100 × 100 mm) for attaching the monitor to a swing arm mount
NOTE: For safety and regulatory information, refer to the Product Notices provided in your
documentation kit. To access the latest user guides or manuals for your product, go to
http://www.hp.com/support and follow the instructions to find your product. Then select Manuals.

6
Front components
To identify the components on the front of the monitor, use this illustration and table.
Table 1-1: Front components and their descriptions
Component
Function
1 Camera Allows you to video chat, record video, and
record still images.
NOTE: Camera functions vary depending on the
camera hardware and software installed on your
product.
2 Speaker mute light The mute button has been turned on.
3 Speaker mute button Mutes or restores speaker sound.
4 Speaker button (decrease sound) Decreases speaker volume incrementally while
you hold down the key.
5 Speaker button (increase sound) Increases speaker volume incrementally while
you hold down the key.
6 Microphone mute button Mutes or restores microphone.
7 Microphone mute light The mute button has been turned on.
8 Power light White: The monitor is on.
Amber: The monitor is in a reduced power state
because of inactivity.
Blinking amber: The monitor is in a reduced
power state because of an Energy Saver
setting.
To identify the components on the rear of the monitor, use this illustration and table.

7
Table 1-2: Rear components and their descriptions
Component Function
1 Audi-out (headphone)/Audio in
(microphone) combo jack
Connects optional powered stereo speakers,
headphones, earbuds, a headset, or a
television audio cable. Also connects an
optional headset microphone. This jack does
not support optional standalone microphones.
IMPORTANT: To reduce the risk of personal
injury, adjust the volume before putting on
headphones, earbuds, or a headset. For
additional safety information, see the
Regulatory, Safety, and Environmental Notices
To access this guide, type HP Documentation
in the taskbar search box, and then select HP
Documentation.

8
NOTE: When a device is connected to the jack,
the speakers are disabled.
2 Power button Turns the monitor on or off.
3 OSD buttons (assignable) When the OSD menu is open, press the
buttons to navigate through the menu. The
function light icons indicate the default button
functions. For a description of these functions,
see Using the OSD function buttons on page
19. You can reassign the function buttons to
quickly select the most commonly used
operations. See Reassigning the function
buttons on page 20.
4 Menu button Press to open the OSD menu.
5 Security cable slot Connects an optional security cable.
6 Power connector Connects a power cord.
7 HDMI Port Connects an HDMI cable from the source
device to the monitor.
8 DisplayPort IN port Connects a DisplayPort cable from the source
device to the monitor.
NOTE: Use a standard USB Type-A charging
cable or cable adapter (purchased separately)
when charging a small external device.
9 USB Type C Connects a USB Type C cable from the source
device to the monitor. Serves as a single
connection when docking an HP notebook.
10 DisplayPort OUT port
(For 23.8” and 27” monitor only)
Connects a DisplayPort cable from the monitor
to a secondary monitor.
11 Network jack Connects an RJ-45 Ethernet cable to the
monitor.
12 USB port (2) Connects a USB device, provides high-speed
data transfer, and charges small devices such
as a smartphone, even when the computer is
off with OSD Performance mode on.
13 USB port (2) Connect USB devices to the monitor
NOTE: The upper port supports USB battery
charging.