HP E27u G4 Manual

Maintenance and Service Guide
E27u 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: December 2021
Document Part Number: M12018-001-E27u
G4-MSG-V1
Assembly part number: M12018-001
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”.

iii
Table of Contents
1Getting started ............................................................................................................................................................. 1
Important safety information................................................................................................................................ 1
Important service information and precautions .................................................................................................... 1
RoHS (2002/95/EC) requirements.......................................................................................................................... 2
General descriptions .............................................................................................................................................. 2
Firmware updates .................................................................................................................................................. 2
Before returning the repaired product to the customer ....................................................................................... 2
2Monitor features........................................................................................................................................................... 3
Features ................................................................................................................................................................. 3
Front components.................................................................................................................................................. 4
Rear and side components..................................................................................................................................... 5
Locating the serial number and product number .................................................................................................. 6
3Illustrated parts catalog .............................................................................................................................................. 7
How to order parts ................................................................................................................................................. 8
4Removal and replacement procedures...................................................................................................................... 10
Preparation for disassembly................................................................................................................................ 10
Rear Cover ............................................................................................................................................................ 10
Power board......................................................................................................................................................... 12
Connector repair .................................................................................................................................................. 14
HDMI connector HDMI1............................................................................................................................. 15
DP connector DP1/DP2............................................................................................................................. 15
USB-C connector USB1 ............................................................................................................................. 15
USB-A connector USB2 ............................................................................................................................. 16
Function test ........................................................................................................................................................ 17
Support and troubleshooting .............................................................................................................................. 17
Index..................................................................................................................................................................... 19

1
1Getting 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

2
location.
●If you must replace a capacitor, insert new parts carefully to avoid a short circuit caused by the 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.

3
2Monitor features
This chapter provides an overview of the monitor’s features.
Features
Depending on the model, your monitor might include the following features:
Display features
The following models, which include full-screen support for lower resolutions; includes custom scaling for
maximum image size while preserving original aspect ratio:
●68.6 cm (27.0 in) diagonal viewable screen area with 2560 × 1440 resolution
●In-plane switching (IPS) panel
●Nonglare 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
●Pivot capability to rotate the monitor head from landscape to portrait orientation
●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
thenremove it with the convenient sliding tab release
●DisplayPort™ video input (cable included)
●High-Definition Multimedia Interface™ (HDMI) video input (cable included)
●USB hub with one USB Type-C® port (cable included) that connects to the computer (upstream) and
fourUSB ports that connect to USB devices (downstream)
●Four on-screen display (OSD) buttons, three that you can reconfigure reconfigure to quickly allow
selection of the most commonly used operations
●Plug and Play capability if supported by your operating system
●VESA® mounting bracket for attaching the monitor head to a wall-mount device or swing arm
●Security cable slot on the rear of the monitor for an optional security cable
●Cable management feature for placement of cables and cords
●On-screen adjustments in several languages for easy setup and screen optimization
●Energy saver feature to meet requirements for reduced power consumption
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.

4
Front components
To identify the components on the front of the monitor, use this illustration and table
Table 2-1 Front components and their descriptions
Component
Description
(1)
Menu button
Press to open the OSD menu. When the OSD menu is open, the Menu
light turns on.
(2-4)
OSD buttons
(assignable)
When the OSD menu is open, press the buttons to navigate
through the menu. Thefunction light icons indicate the default
button functions. For a description of thesefunctions, see Using
the OSD function buttons on page 18.
You can reassign the function buttons to quickly select the most
commonly usedoperations. See Reassigning the function
buttons on page 19.
(5)
Power button
Turns the monitor on or off.
NOTE: Be sure that the master power switch on the monitor is in
the On position toturn on the monitor.
(6)
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 Saversetting.

5
Rear and side components
To identify the components on the rear of the monitor, use this illustration and table.
Table 2-2 Rear and side components and their descriptions
Component
Description
(1)
Security cable slot
Connects an optional security cable.
(2)
Power connector
Connects an AC adapter.
(3)
VESA release button
Releases the stand from the monitor.
(4)
HDMI port
Connects the HDMI cable to a source device such as a
computer or game console.
(5)
DisplayPort IN connector
Connects the DisplayPort cable to a source device such as a computer
or game console.
(6)
USB Type-C port
(upstream)
Connects a USB Type-C cable to a source device such as a computer
or game console. ThisUSB Type-C port can function as a DisplayPort
audio/video input or as a USB 3.0 connection. It can also be used to
deliver up to 65 W of power to a device. Power outputsare 9 V/10
V/12 V/15 V/20 V to achieve a 65 W output.
This port also enables the USB Type-A ports to perform their
functions.
(7)
DisplayPort OUT
connector
Connects the DisplayPort cable to a source device such as a
computer or game console.
(8)
USB ports (2)
(downstream)
Connect a USB cable to a peripheral device, such as a keyboard,
mouse, or USB hard drive.
(9)
USB ports (2)
(downstream)
Connect a USB cable to a peripheral device, such as a keyboard,
mouse, or USB hard drive,and charge peripheral devices.

6
Locating the serial number and product number
The Spec label (1) and Barcode label (2) are located on the rear of the monitor. The serial number and product
number are located on a Barcode label. You may need these numbers when contacting HP about the monitor
model.
Barcode label (except India)
Barcode label (For India):
Spec label (ww & India)

7
3Illustrated parts catalog
To identify the monitor major components, use this illustration and table.
Table 3-1: Monitor major components and their descriptions
Item
Description
Part number
Qty
1
#Panel
1
2
#Mid cover screw
13
3
#Bracket
1
4
#Mid cover top
1
5
#Mid cover right
1
6
#Mid cover left
1
7
#USB board
1
8
#Rear cover LOGO
1
9
#Rear cover
1
10
#VISA
2
11
#Hinge
1
12
#Column
1
13
#Base
1
14
#Lift cover
1
15
#Release button
1
16
#Spring
2
17
#Speaker cover
1
18
#OSD button
1

8
19
#OSD key board
1
20
#Interface board
1
21
#Power board
1
22
#Safety Mylar
1
23
#Front cover
1
24
#Front cover LOGO
1
25
#Lens
1
How to order parts
The HP authorized repair center can purchase the power board from HP.
Power board
Description
HP spare part number
Manufacturer part number
PWR BD E27u G4 LGD/WT-Panda D
N09300-001
755.A2403.A001
Capacitors and connectors are available for purchase from the following EU distributors:
CAPXON: www.capxongroup.com
Capacitors by distributor
Component description
Location
Component distributor
Distributor part number
CAP EL 680U 35V M P5 10*20 ZH
CAPXON
AC714,AC715,AC717
CAPXON
ZH681M035G200ECR
Connectors by manufacturer
Component
description
Location
identifier
Component
distributor
Distributer part number
Remark
HDMI
HDMI1
Switchcraft
Inc.
https://www.digikey.com
PN:
137-RAHHD19TR-ND
DP
DP1
DP2
Molex
https://www.digikey.com
PN:
WM14328DKR-ND
1. Only DP1.1
2. Cut off the through hole
USB-C
USB1
Molex
https://www.digikey.com
PN:
900-2171840001DKR-ND
Cut off the Pin as below

9
USB-A
USB2
Molex
https://www.digikey.com
PN:
1002-004-01010
Cut off the Pin as below
NOTE: The connector may need to be modified to meet functionality, regulatory and safety requirements if
it is not an exact match.
You can purchase cables from the HP part store at https://partsurfer.hp.com/Search.aspx.
NOTE: HP continually improves and changes product parts. For complete and current information about
supported parts for your computer, go to http://partsurfer.com, select your country or region, and then
follow the on-screen instructions.
Internal and External Power Supplies are available for purchase from the following EU distributor: EET
https://www.eetgroup.com/en-eu/

10
4Removal and replacement procedures
Adherence to these procedures and precautions is essential for proper service.
Preparation for disassembly
Use this information to properly prepare to disassemble and reassemble the monitor.
1) Read the “Important safety information” and “Important service information and precautions” sections in
the “Getting started” chapter of this guide.
2) Clean the room for disassembly.
3) Identify the disassembly area.
4) Check the position that the monitors are to be placed along with the number of monitors. Prepare the area
for material flow according to the disassembly layout.
5) Be sure to have the following equipment and materials:
Press fixture
Working table
Screwdriver
Knife
Gloves
Cleaning cloth
ESD protection
Scraper bar in the following dimensions:
Rear Cover
Before removing the Rear Cover, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 10.
1) Pull the release button to remove Stand Base From Display Head

11
2) Use tool to release the four screws from rear cover. Pull the rear cover by disconnecting the cables.
3) Release the two screws for removing the USB BD. Remove OSD BD from the hook of the rear cover.
4) Remove the front bezel. Remove AL foil and panel lamp cable.

12
5) Release all the screws for releasing the middle bezel. Disconnect two LVDS cables and remove bracket.
6) Remove the safety Mylar, then release the seven screws from the interface BD and power BD
7) Remove the power BD and Interface BD from the bracket
Power board
The power board part number is 755.A2403.A001.
Before removing the power board, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 10.
Remove the power board:
1) The HP E24u G4 power board connector position is as follows:

13
2) Locate the part number location on the board.

14
3) Pin solder with soldering iron and absorber.
NA
4) Lift the connector up and away from the PCB.
No
Connector repair
This procedure includes HDMI, Display Port, Mini Display Port, USB-C and USB-A connectors.
The connectors are on the main board (board part number 7ZB.A3B01.0010).
The connector identifiers are as follows:
Connector
Location
HDMI
HDMI1
DP
DP1,DP2
USB-C
USB1
USB-A
USB2
Before repairing connectors, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 10.

15
HDMI connector HDMI1
Repair the HDMI connector:
1) Use a soldering iron to remove as much solder as possible from the pin.
2) Lift the HDMI connector from the PCB.
3) Place the new component on the PCB. Be sure that it matches the PCB footprint.
4) Solder the new component.
DP connector DP1/DP2
Repair the DP connector:
1) Use a soldering iron to remove as much solder as possible from the pin.
2) Lift the DP connector from the PCB.
3) Place the new component on the PCB. Be sure that it matches the PCB footprint.
4) Solder the new component.
USB-C connector USB1
Repair the USB-B connector:
1) Use a soldering iron to remove as much solder as possible from the pin.

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2) Lift the USB-B connector from the PCB.
3) Place the new component on the PCB. Be sure that it matches the PCB footprint.
Solder the new component
USB-A connector USB2
Repair the USB-A connector:
1) Use a hot air gun and a soldering iron to remove as much solder as possible from the pin.
2) Lift the USB-A connector from the PCB.
3) Place the new component on the PCB. Be sure that it matches the PCB footprint.
4) Solder the new component.

17
Function test
After repair, be sure to confirm that all functions are working.
Table 4-1: Function test
Test item
Operating description
Tool used
HDMI test
Confirm whether image displays
Computer or DVD player
DP test
Confirm whether image displays
Computer or DVD player
USB-C Alt-Mode
Confirm whether image displays and sound plays
correctly on the monitor.
Computer or Notebook
USB-C PD
Function
Confirm PDO/Charging working normally.
Notebook
USB Hub Test
Confirm USB function of 4-USB Type-A working
normally.
Computer or Notebook
Support and troubleshooting
The following table lists possible problems, the possible cause or each problem, and the recommended
solutions.
Table 4-2: Solving common problems
Problem
Possible cause
Solution
Screen is blank or
video is flashing.
Power cord is disconnected.
Connect the power cord.
Monitor is turned off.
Power the power button.
NOTE: If pressing the Power
button has no effect, press
and hold the power button
for 10 seconds to disable the
Power button lockout
feature.
Video cable is improperly connected.
Connect the video cable
properly.
System is in Auto-Sleep Mode.
Press any key on the
keyboard or move the mouse
toinactivate the screen
blanking utility.
Video card is incompatible.
Open the OSD menu and
select the Input menu.
Set Auto-Switch Input
to Off and manually
select the input.
or