HP U27 Manual
Maintenance and Service Guide
U27 4k model
L95468
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: Mar 2022
Document Part Number: L95468-U27 4k-
MSG-V1
Assembly part number: L95468-001
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
Rear components ................................................................................................................................................... 4
Locating the serial number and product number .................................................................................................. 5
3Illustrated parts catalog .............................................................................................................................................. 6
How to order parts ................................................................................................................................................. 7
4Removal and replacement procedures ...................................................................................................................... 10
Preparation for disassembly................................................................................................................................ 10
RC.......................................................................................................................................................................... 10
Connector repair .................................................................................................................................................. 15
HDMI connector P200 ............................................................................................................................... 16
DP connector P300 ................................................................................................................................... 17
Function test ........................................................................................................................................................ 18
Support and troubleshooting .............................................................................................................................. 18
Index..................................................................................................................................................................... 20
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 near
pin.
2
●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
Monitor features
This chapter provides an overview of the monitor’s features.
Features
Depending on the model, your monitor might include the following features:
•68.58 cm (27 in) IPS monitor with 3840 × 2160 @ 30 Hz (wireless connection) or 60 Hz (wired
connection) resolution, ultrawide backlit display, plus full-screen support for lower resolutions
•Antiglare panel with an LED backlight
•Wide viewing angle to allow viewing from a sitting or standing position, or when moving from side to
side
•Wireless sharing from notebook computer to monitor
•HP Quick Pair app for initiating wireless pairing
•Three-sided borderless screen
•Tilt and swivel adjustment capability
•Height adjustment capability
•DisplayPort™ (DP) video input
•High-Definition Multimedia Interface (HDMI) video input (cable provided)
•Audio-in jack
•Audio-out (headphone) jack
•Plug and Play capability, if supported by your operating system
•Security cable slot provision on rear of monitor for optional security cable
•On-screen display (OSD) adjustments in several languages for easy setup and screen optimization
•High-bandwidth Digital Content Protection (HDCP) copy protection on all digital inputs
•VESA® mounting bracket for attaching the monitor to a wall-mount device or swing arm
•Low blue light mode settings to create a more relaxing and less stimulating image
•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 guide, go to http://www.hp.com/support, and follow the instructions to find
your product. Then select User Guides.
4
Rear components
To identify the components on the rear of the monitor, use this illustration and table.
Table 1-1: Rear components and their descriptions
Component
Function
1 HDMI port Connect HDMI cables to the HDMI connectors on
source devices.
2 DisplayPort connector
Connects a DisplayPort cable to the DisplayPort
connector on the source device.
3 Power connector
Connects an AC adapter.
4 Audio in Connects an external audio device to the
monitor.
5 Headphone jack
Connects headphones to the monitor.
6 USB type B port (upstream)
Connects the USB Type-B cable to a source
device such as a computer or game console.
7 USB ports (3)
Connect a USB cable to a peripheral device, such
as a keyboard, mouse, or USB hard drive.
8 Security cable slot
Connects an optional security cable.
5
Locating the serial number and product number
Depending on the product, the serial number and product number are located on a label on the rear of the
monitor or on a label under the front bezel of the monitor head. You might need these numbers when contacting
HP for support.
For worldwide models (except India):
Barcode label
Spec label
For India:
Bar code label
6
Illustrated parts catalog
To identify the monitor major components, use this illustration and table.
Item Description Qty
1 LCM Bare, HP U27 4K Wireless 1
2 FRONT DECO(ABS 94-HB/SP-1430)(HP U27 4k
WIRELESS)ASS'Y 1
3 REAR SUPPORT-R(ABS 94-HB/J13417B5)(ENCORE2-27F) 1
4 REAR SUPPORT-L(ABS 94-HB/J13417B5)(ENCORE2-27F) 1
5 MAC. SCREW-MI M3.0*4.0L, BLK-Ni 16
6 MAC. SCREW-MRF M3.0*6.0L, BLK-Ni 2
7 MAIN BD ASS'Y HP Beacon U27 4K Wireless (LM270WR3-
RSAL1)
1
8 HP Miracast WIFI Module PCBA 90*52mm LA46HD225-1H
FOR DVT
1
9 SHIELDING (SECC 0.5T)(HP U27 4k WIRELESS) 1
10 PIFA Antenna 1.37RF for WLAN 802.11 a/b/g L64AT014-
CS-H BLK 200mm+500mm HF
1
11 REAR COVER(ABS 94-HB/Jack Black (6009-
0337))(HP U27
4k WIRELESS)ASS'Y
1
12 MAC. SCREW-MI M3.0*6.0L, BLK-ZNNI(HEAD DIAMETER
7.0)
2
13 SPK 4W 4ohms 85*30*26mm (R550mm/L450mm) NB17-
048027-001H LUXSHARE FOR Miracast HF
1
7
How to order parts
Connectors by manufacturer
•Digi-Key Component: Digi-Key Component United Kingdom
Component description Location
identifier
Component
distributor
Distributer part number
HDMI
P200
Farnell
47659-1100
DisplayPort
P300
DigiKey
2041441-1
DC Power
P1
DigiKey
732-5935-ND
Audio in
AP1
DigiKey
STX-3680-5NB
Audio out
AP2
DigiKey
STX-3680-5NB
USB- B type
UP1
DigiKey
USB3 B-TOP
or
KUSBVX-BS1N9-BL30
USB- A type
UP2/UP3/UP4
Farnell
USB1086-GF-B
NOTE: The connector may need to be modified to meet functionality, regulatory and safety requirements if
it is not an exact match.
HDMI: If use the HDMI connector of Farnell 47659-1100, the RC (rear cover)need to be modified to meet
functionality, regulatory and safety requirements because it is not an exact match.
14 DISPLAY BD ASS'Y HP Beacon 1
15 NECK(AL/Silver(SP-1430))(HP U27 4k WIRELESS)FULFIL 1
16 BASE(ABS 94-HB/Silver(SP-1430))(HP U27 4k
WIRELESS)FULFIL
1
17 HDMI(2.0) CABLE 150mm
(1P*#30+EAHM)*5+4C*#30+AEB AL 85%
1
18 WH FFC 6P(0.5mm) 110mm(3FOLD+PRO)60V G/F
(A8+A8) HF
1
19 WH FFC 30P(0.5mm) 200mm(3FOLD+PRO+3M)60V G/F
W/CONN*2+AL(AA) HF
1
20 WH FFC 8P(0.5mm) 530mm(4FOLD+PRO)60V G/F
(A8+A12/V-CUT) HF
1
21 WH FFC 20P(0.5mm) 380mm(3FOLD+PRO)60V G/F
(A5+A10) HF
1
8
And it will be lower height than the surface of the rear cover
DisplayPort &DC power:If use the DisplayPort connector (2041441-1) or the DC power connector (732-5935-ND),
the layout of the PCB (printed wire board) needs to be modified. The pin distance is different compares to original
connector, and it cannot fit I/O (input/output) hole.
The DisplayPort will be lower height than RC surface, and the DC power is over the RC hole, need to modify the ID.
9
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
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:
RC
Before removing the RC, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 10.
Remove the RC:
EL-MF877-00 Page 11
Template Revision C
Last revalidation date 13-April-2020
HPI instructions for this template are available at EL-MF877-01
1. Lay the display on soft desk and push the button of stand to unlock the stand, then pull
out the stand form the monitor head.
2. Twist out the screw and separate base and stand.
Push up the black
button
Twist out the screw
EL-MF877-00 Page 15
Template Revision C
Last revalidation date 13-April-2020
HPI instructions for this template are available at EL-MF877-01
Connector repair
This procedure includes HDMI and DisplayPort connectors.
The connectors are on the main board (board part number R352718220150
The connectors identifiers are as follows:
Connector Location
HDMI P200
DisplayPort P300
DC Power P1
Audio In AP1
Audio out AP2
USB B type UP1
USB A type UP2/UP3/UP4
Before repairing connectors, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 12.
P200 P300 P1 AP1 AP2 UP1 UP3 UP2 UP4
16
HDMI connector P200
Repair the HDMI connector:
1) Use a soldering iron and a desoldering 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 P200 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.
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1
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