HP E34m G4 Manual

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Maintenance and Service Guide
E34m G4 model
SUMMARY
This guide provides information about spare parts, removal and replacement of parts, diagnostic tests, problem
troubleshooting, and more.

© Copyright 2022 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: Jan. 2022
Document Part Number:
M56191-E34m G4-MSG-V1
Assembly part number: M56191-001
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”.

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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.................................................................................................................................... 5
Rear components .................................................................................................................................... 6
Locating the serial number and product number..................................................................................... 8
3Illustrated parts catalog............................................................................................................................... 10
How to order parts................................................................................................................................. 11
4Removal and replacement procedures ....................................................................................................... 13
Preparation for disassembly.................................................................................................................. 13
Rear Cover ............................................................................................................................................ 13
Power board .......................................................................................................................................... 16
Connector repair.................................................................................................................................... 17
HDMI 1 connector CN501........................................................................................................... 19
DP connector CN502 .................................................................................................................. 19
USB Type-C connector CN503...................................................................................................20
RJ45 connector CN103............................................................................................................... 21
USB 3.0A connector CN117& CN118 ........................................................................................ 21
AUDIO connector CN610............................................................................................................ 22
USB 3.0 A connector CN154 & CN153 ...................................................................................... 22
Function test.......................................................................................................................................... 23
Support and troubleshooting ................................................................................................................. 23
Index...................................................................................................................................................... 25

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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.

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●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.

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2 Monitor features
This chapter provides an overview of the monitor’s features.
Features
Display features
● 86.36 cm (34 in) diagonal viewable screen area with 3440 × 1440 resolution, plus full-screen 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
● Wide viewing angle to allow viewing from a sitting or standing position, or moving from side to side
● Tilt, swivel and height adjustment capabiliteis for 23.8 and 27" monitor
Tilt, swivel capabilities for 34" monitor
● Pivot capability to rotate the monitor head from landscape to portrait orientation for 23.8 and 27” monitor
only.
● Menu button and three on-screen display (OSD) buttons, three that you can reconfigure to quickly allow
selection of the most commonly used operations
● On-screen 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
Connectors
● DisplayPort™ video input
● High-Definition Multimedia Interface™ (HDMI) video input (cable included)
● Audio-out (headphone) port on side
● USB hub with one USB Type-Cport that connects to the computer (upstream) and four USB ports that
connect to USB devices (downstream). 1 of side USB-A 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.

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● 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
● Support for a mounting bracket to attach the monitor to a workstation
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.

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Front components
To identify the components on the front of the monitor, use this illustration and table.
Table 1-2: 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 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) Mutes or restores microphone. 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.

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Rear components
To identify the components on the rear of the monitor, use this illustration and table.
Table 1-4: Rear components and their descriptions
Component Function
1 Audioout
(headphone)/Audioin
(microphone) combo jack
Connects optional powered stereo speakers, headphon
e
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.
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 an power cord.
(7) HDMI Port Connects an HDMI cable from the source device to the
monitor.

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(8) DisplayPort Connects a DisplayPort cable from the source device
to the monitor.
(9) USB Type C Connects a USB TypeC cable from the source device
to the monitor. Serves as a single
(10) Network jack Connects an RJ45 Ethernet cable to the monitor.
(11) USB ports (2) Connects a USB device, provides highspeed
data transfer, and charges small devices
such as a smartphone, even when the computer is off
with OSD Performance mode on.
(12). USB port (2) Connect USB devices to the monitor.
NOTE: The right port supports USB battery charging.

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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
Spec label

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For India:
Bar code label
Spec label

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3 Illustrated parts catalog
To identify the monitor major components, use this illustration and table.
Item Description Qty
1 LOGO HP 12 1
2 DECO_BEZEL L34WRC-Dhp4-p4 1
3 BASE_ASS’Y NA N/A 1
4 stand ass'y NA NA 1
5 SHIELD_AUDIO 1
6 SHIELD_USB 1
7 LCD TPM340Y1-2H012 21B FQ TPV 1
8 MIDDLE_FRAME L34WRC-Dhp4-p4 1
9 ADAPTER BOARD NA 1
10 MAIN BOARD 1
11 INSULATING SHEET NA 1
12 MAINFRAME 1
13 SPEAKER 5W 1
14 HINGE ASS'Y 1

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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
PSU E34m G4 N02581-001 PLPCLL482UAA1
Capacitors and connectors are available for purchase from the following EU distributors:
Farnell: Farnell UK - Electronic Components Distributor
RS Component: Capacitors | RS Components (rs-online.com)
Tme Component: Transfer Multisort Elektronik
Digi-Key: Digikey Electronics
15 HINGE ASS'Y 1
16 RUBBER PAD 2
17 HINGE ASS'Y 1
18 HINGE ASS'Y 1
19 SHIELD_PLATE 1
20 LOGO HP 56 1
21 KEY BOARD 1
22 REAR_COVER L34WRC-Dhp4-p4 1
23 KEY BOARD 1
24 AUDIO BOARD 1
25 BKT_USB 1
26 CONNECTOR BOARD 1
27 CONNECTOR BOARD 1
S1 0D1G1030 5120 RA 10
S2 0M1G2940 10 47 CR3 4
S3 0M1G3030 5120 13
S4 QM1G38400601200ARA 1
S5 QQ1G353000412000RA 2
S6 0Q1G2030 6120 11
S7 0M1G102500404700RA 1
S8 Q01G6019 1 4

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Capacitors by distributor
Component
description Location Component distributor Distributor part number
EC 680uF 20% 35V
12.5*20 3000 hr 2A C9102
C9130
C9103
Digi-Key EGPA350ELL681MK20S
EC 680uF 20% 35V
12.5*20 3000 hr 2A EGPA350ELL681MK20S
Connectors by manufacturer
Component
description
Location
identifier
Component
distributor Distributer part number
HDMI CN501 RS SD-47151-001
(Molex)
DP CN502 Farnell DP1RD20JQ1
(JAE)
USB Type-C CN503 RS DX07S024JJ2R1300
（JAE）
RJ-45 CN103 tme LMJ34788114NWGY
（AMPHENOL ）
USB 3.0 A CN117/CN118 RS 10117835-002LF
（Amphenol ICC）
Phone Jack CN610 NA Contact HP Support
USB 3.0 A CN154/CN153 RS 10117835-002LF
（Amphenol ICC）
NOTE: Rear cover and chassis need to be modified to hold connector. Connector may need
modifications to meet functional, safety and regulatory requirements accordingly if it doesn’t match
exactly.
You can purchase cables from the HP part store at https://partsurfer.hp.com/Search.aspx.
Internal and External Power Supplies are available for purchase from the following EU distributor: EET
https://www.eetgroup.com/en-eu/
NOTE: HP continually improves and changes product parts. For complete and current information
about supported parts for your product, go to https://partsurfer.hp.com/Search.aspx, select your
country or region, and then follow the on-screen instructions.

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4 Removal 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 13.
Remove the Rear Cover:
1) Remove four screw from the rear case.

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2) Use your fingers to split the left and right sides apart between the middle frame and rear case.
3) Insert the scraper bar tool into the gap between the middle frame and rear case, and then rotate.
The hook opens. Repeat the steps.
4) Disassemble Rear Cover.
5) Remove the Control board wire, USB board wire and key board wire from the Interface-board.

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6) Remove the Audio board wire, Connector board wire and Webcam module wire from the Interface-
board.
7) Disassemble the USB board from the Rear Cover (if required).
8) Remove 2 screws from the bracket.

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9) Disassemble 7 screws from the board.
10) Disassemble all the boards from housing.
11) Disconnect all the wires from the board.
Power board
The power board part number is PLPCLL482UAA1.
Before removing the power board, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 13.
Remove the power board:
1) The HP E34m G4 power board connector position is as follows:
2) Locate the part number location on the board.
Warning: After unplugging the
power supply, the capacitance
is still charged, do not touch
and discharge the capacitor.

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Connector repair
This procedure includes HDMI, DisplayPort, USB Type-C, RJ-45 and USB 3.0 connectors.
The connectors are on the main board (board part number CBPR1R4H0Q3).
The connectors identifiers are as follows:
Connector Location
HDMI1 CN501
DP CN502
USB Type-C CN503
RJ45 CN103
USB 3.0 CN117
USB 3.0 CN118
This procedure includes Audio connector.
The connectors are on the Audio board (board part number AUPCPQB2).
The connector identifiers is as follows:
Connector Location
AUDIO CN610
Main Board
CN117
CN502
CN501 CN503 CN103 CN118
CN610 Audio Board