HP E23 G4 Manual

Maintenance and Service Guide
E23 G4/E24 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: May 2021
Document Part Number: L97368-E23 G4 -
MSG-V2
Assembly part number: L97368-001 (E23
G4), L97371-001 (E24 G4)
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 .............................................................................................................................................. 8
How to order parts ................................................................................................................................................. 9
4Removal and replacement procedures...................................................................................................................... 11
Preparation for disassembly................................................................................................................................ 11
RC.......................................................................................................................................................................... 11
Power board......................................................................................................................................................... 14
Connector repair .................................................................................................................................................. 16
D-Sub connector CRT1.............................................................................................................................. 16
HDMI connector HDMI1............................................................................................................................. 17
DP connector DP1..................................................................................................................................... 17
USB-B connector USB1 ............................................................................................................................. 18
USB-A connector USB2 ............................................................................................................................. 19
Function test ........................................................................................................................................................ 19
Support and troubleshooting .............................................................................................................................. 20
Index..................................................................................................................................................................... 22

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

2
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:
●The following models, which include full-screen support for lower resolutions; includes custom scaling
for maximum image size while preserving original aspect ratio:
–60.5 cm (23.8 in) diagonal viewable screen area with 1920 × 1080 resolution
–58.4 cm (23.0 in) diagonal viewable screen area with 1920 × 1080 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 then
remove it with the convenient sliding tab release
●DisplayPort™ video input (cable included)
●High-Definition Multimedia Interface™ (HDMI) video input (cable included)
●VGA video input (cable included in select regions)
●USB hub with one USB Type-B port (cable included) that connects to the computer (upstream) and four
USB ports that connect to USB devices (downstream)
●Four on-screen display (OSD) buttons, three that you can 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 and select a menu item from the OSD.
(2)
OSD
buttons
(assignab
le)
When the OSD menu is open, press the buttons to navigate
through the menu. The function light icons indicate the default
button functions.
You can reassign the function buttons to quickly select the most
commonly usedoperations
(3)
Power button
Turns the monitor on or off.
(4)
Power light
White: The monitor is on.
Amber: Monitor is in a reduced power state because of inactivity.

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 the power cord.
(3)
VESA release button
Releases the stand from the monitor.
(4)
DisplayPort connector
Connects the DisplayPort cable to a source device such as a
computer or gameconsole.
(5)
HDMI port
Connects the HDMI cable to a source device such as a computer or
game console.
(6)
VGA port
Connects the VGA cable to the source device.
(7)
USB Type-B port
(upstream)
Connects the USB Type-B cable to a source device such as a
computer or gameconsole.
NOTE: A USB Type-B cable or a USB Type-C cable must be
connected from thesource device to the monitor to enable USB
Type-A ports on the monitor.
(8)
USB ports (2)
(downstream)
Connect a USB cable to a peripheral device, such as a keyboard,
mouse, or USB harddrive.
(9)
USB ports (2)
(downstream)
Connect a USB cable to a peripheral device, such as a keyboard,
mouse, or USB harddrive.

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 Safety label. You may need these numbers when contacting HP about the monitor
model.
For worldwide models(except India):
Barcode label for E23 G4
Barcode label for E24 G4
For India:
Barcode label for E23 G4
Barcode label for E24 G4
Spec label for E23 G4(WW & India)

7
Spec label for E24 G4(WW & India)

8
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
#ASSY Panel
1
2
#Screw
11
3
#Lens
1
4
#HP Front LOGO
1
5
#Mid cover- E23 G4
1
6
#Grounding Screw
1
7
# PCB Screw
1
8
#Safety Mylar
1
9
#Assy Power BD
1
10
#VGA Screws
2
11
#Hit pot Mylar
1
12
#Assy IF BD
1
13
#ASSY Main chassis
1
14
#USB BD Screws
2

9
15
#ASSY USB BD
1
16
#ASSY Rear cover
1
17
#Spring
2
18
#Screw
2
19
#Slider
1
20
#OSD key
1
21
#OSD key BD
1
22
#Speaker cover
1
23
#HP Rear LOGO
1
24
#VESA Cosmetic cover
1
25
#Wall mount Screws
4
26
#ASSY Stand
1
27
#ASSY Base
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
POWER BD RB23HHC-XUS(C)E23 G4 D
M84511-001
755.06704.0001
POWER BD RB23HHC-XUL(C)E23 G4 D
M84512-001
755.06704.0002
POWER BD RB23HHC-XUE(C)E23 G4 D
M84513-001
755.06704.0003
POWER BD RB238HC-XUD(C) E24 G4 DIP
M84514-001
755.06602.0001
POWER BD RB238HC-XUU(C) E24 G4 DIP
M84515-001
755.06602.0002
POWER BD RB238HC-XUM(C) E24 G4 DIP
M84516-001
755.06602.0003
POWER BD RB238HC-XUS(C) E24 G4 DIP
M84517-001
755.06602.0004
POWER BD RB238HC-XUE(C) E24 G4 DIP
M84518-001
755.06602.0005
POWER BD RB238HC-XUL(C) E24 G4 DIP
M84519-001
755.06602.0006
Capacitors and connectors are available for purchase from the following EU distributors:
SUSCON : www.su-scon.com
CAPXON: www.capxongroup.com
Capacitors by distributor
Component description
Location
Component
distributor
Distributor part number
CAP EL 470U 25V M RT5
10*16 HG
PT503,PT504,PT506
SUSCON
HG025M471G16T014P50R
CAP EL 470U 25V M RT5 10*16
FH CAPXON
CAPXON
FH471M025G160ETABZ

10
Connectors by manufacturer
Component
description
Location
identifier
Component
distributor
Distributer part number
Remark
D-Sub
CRT1
Kycon, Inc.
https://www.digikey.com
PN
2092-K61X-E15S-N-ND
HDMI
HDMI1
Switchcraft
Inc.
https://www.digikey.com
PN:
137-RAHHD19TR-ND
DP
DP1
Molex
https://www.digikey.com
PN:
WM14328DKR-ND
1.Only DP1.1
2.Cut off the through hole
USB-B
USB1
EDAC Inc.
https://www.digikey.com
PN:
690-009-521-900
Straighten the Pin as below
USB-A
USB2
Molex
https://www.digikey.com
PN:
WM10420-ND
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.

11
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:
RC
Before removing the RC, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 11.
1) Pull the release button to Remove Stand Base From Display Head

12
2) Remove 4 screws, and Pull the rear cover to remove Rear cover
3) Remove USB BD Screws to remove USB BD. Release OSD key BD from rear cover
4) Remove all cables and tape to remove main chassis ASSY

13
5) Release all screws, remove Mid-cover ASSY
6) Remove black Mylar
7) Remove 2pcs VGA screws, 5pcs PCB screws to remove PCB BD

14
Power board
The power board part number is 755.06704.0001 or refer to page 9.
Before removing the power board, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 11.
Remove the power board:
1) The HP E23&E24 G4 power board connector position is as follows:
CN701 Wistron P/N: 021.60237.0106
2) Locate the part number location on the board.

15
3) Pin solder with soldering iron and absorber.
CN701
4) Lift the connector up and away from the PCB.
CN701

16
Connector repair
This procedure includes HDMI, Display Port, USB-B, USB-A connectors.
The connectors are on the main board (board part number 7ZB.06701.0006).
The connector identifiers are as follows:
Connector
Location
D-Sub
CRT1
HDMI
HDMI1
DP
DP1
USB-B
USB1
USB-A
USB2
Before repairing connectors, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 11.
D-Sub connector CRT1
Repair the D-Sub connector:
1) Use a soldering iron and a de-soldering pump to remove as much solder as possible from the pin.

17
2) Lift the D-Sub 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.
HDMI connector HDMI1
Repair the HDMI connector:
1) Use a soldering iron and a de-soldering pump to remove as much solder as possible from the pin.
2) Use a hot air gun to melt the solder on the pins.
3) Lift the HDMI connector from the PCB.
4) Place the new component on the PCB. Be sure that it matches the PCB footprint.
5) Solder the new component.
DP connector DP1
Repair the DP connector:
1) Use a soldering iron and a de-soldering pump to remove as much solder as possible from the pin.