HP 27MQ Manual

Maintenance and Service Guide
HP 27mq 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.
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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 June 2021
Document Part Number: L75252-HP 27mq-MSG-V1
Assembly part number: L75252-001
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 components..........................................................................................................................................5
Locating the serial number and product number...........................................................................................6
3Illustrated parts catalog.......................................................................................................................................7
How to order parts.........................................................................................................................................8
4Removal and replacement procedures...............................................................................................................9
Preparation for disassembly..........................................................................................................................9
RC ...............................................................................................................................................................10
Power board................................................................................................................................................15
Connector repair..........................................................................................................................................16
HDMI connector CN503....................................................................................................................17
D-SUB connector CN101..................................................................................................................18
Function test................................................................................................................................................19
Function test................................................................................................................................................19
Support and troubleshooting.......................................................................................................................19
Index............................................................................................................................................................20

1
1 Getting started
Read this chapter to learn about safety information and where to find additional HP resources.
Important safety information
A power cord is included with the monitor. If you use another cord, use only a power source and connection
appropriate for this monitor. For information about the correct power cord set to use with the monitor, see the
Product Notices provided in your documentation kit.
WARNING! To reduce the risk of electric shock or damage to the equipment:
● Plug the power cord into an AC outlet that is easily accessible at all times.
●If the power cord has a 3-pin attachment plug, plug the cord into a grounded (earthed) 3-pin outlet.
●Disconnect power from the computer by unplugging the power cord from the AC outlet. When
unplugging the power cord from the AC outlet, grasp the cord by the plug.
For your safety, do not place anything on power cords or cables. Care should be taken to route all
cords and cables connected to the monitor so that they cannot be stepped on, pulled, grabbed, or
tripped over.
To reduce the risk of serious injury, read the Safety & Comfort Guide provided with your user guides.
It describes proper workstation setup and proper posture, health, and work habits for computer
users. The Safety & Comfort Guide also provides important electrical and mechanical safety
information. The Safety & Comfort Guide is also available on the Web at http://www.hp.com/ergo.
IMPORTANT: For the protection of the monitor and the computer, connect all power cords for the
computer and its peripheral devices (such as a monitor, printer, scanner) to a surge protection device
such as a power strip or uninterruptible power supply (UPS). Not all power strips provide surge
protection; the power strip must be specificallylabeled as having this capability. Use a power strip
whose manufacturer offersa damage replacement policy so that you can replace the equipment if
surge protection fails.
Use the appropriate and correctly sized furniture designed to properly support your monitor.
WARNING! Monitors that are inappropriately situated on dressers, bookcases, shelves, desks,
speakers, chests, or carts could fall over and cause personal injury.
NOTE: This product is suitable for entertainment purposes. Consider placing the monitor in a
controlled luminousenvironment toavoid interference from surroundinglightandbrightsurfacesthat
might cause disturbing reflectionsfrom the screen.
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.

2
●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
2 Monitor features
This chapter provides an overview of the monitor’s features.
Features
This guide describes features of the following monitors:
● 68.6 cm (27.0 in) diagonal viewable screen area with 2560 ×1440 resolution, plus full-screen support
for lower resolutions; includes custom scaling for maximum image size while preserving original aspect
ratio
The monitor features include the following:
● Nonglare IPS panel with an LED backlight
●Wide viewing angle to allow viewing from a sitting or standing position, or when moving from side to side
● Tilt capability
●Pivot capability to rotate the monitor panel from landscape to portrait mode
●Swivel and height adjustment capabilities
●Removable stand for flexiblemonitor panel mounting solutions
●VGA video input
●One HDMI (High-DefinitionMultimedia Interface) video input (cable provided)
● 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
● HP Display Assistant software for adjusting monitor settings and enabling the theft deterrence features
●HDCP (High-bandwidth Digital Content Protection) copy protection on all digital inputs
●Energy saver feature to meet requirements for reduced power consumption
NOTE: For safety and regulatory information, see the Product Notices provided on your optical disc, if one is
included, or in your documentation kit. To access the latest user guide, go to http://www.hp.com/support and
following the instructions to findyour product. Then select User Guides.

4
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
Control
Function
1
Menu button
Press to open the OSD menu, select a menu item from the OSD, or close the OSD menu.
When the OSD menu is open, the Menu light turns on.
2
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 function buttons on page 15
You can reassign the function buttons to quickly select the most commonly used
operations. See Reassigning the function buttons on page 15.
3
Power button
Turns the monitor on or off.

5
Rear components
To identify the components on the rear of the monitor, use this illustration and table.
Table 1-1 Rear components
Component
Function
1
Power connector
Connects the power cord.
2
HDMI port
Connects the HDMI cable to a source device such as a computer
or game console.
3
VGA port
Connects the VGA cable to the source device.
4
Security cable slot
Connects an optional security cable to the monitor.

6
Locating the serial number and product number
The serial number and product number are located on a label on the rear of the monitor panel. You may
need these numbers when contacting HP about the monitor model.
For worldwide models:

7
3 Illustrated parts catalog
To identify the monitor major components, use this illustration and table.
Item
Description
Qty
1
PANEL
1
2
MIDDLE_FRAME
1
4
LENS
1
5
LED BOARD
1
6
ADAPTER BOARD
1
7
MAIN BOARD
1
8
MAINFRAME
1
9
KEY BOARD
1
10
REAR_COVER
1
10
BASE_ASS’Y
1
11
stand ass'y
1
12
BKT_VESA
1
13
INSULATING SHEET
6
14
INSULATING SHEET
1
S1
SCREW 3 4(MIDDLE FRAME/PANEL)
11
S2
SCREW -- 6mm(POWER BOARD/MAINFRAME)
1
S3
SCREW D3 6(MAIN BOARD/POWER BOARD/MAINFRAME)
5
S4
SCREW(KEY BOARD/MAINFRAME)
4
S5
SCREW M4 10(STAND ASSY/REAR COVER)
4

8
How to order parts
The HP authorized repair center can purchase the power board from HP.
Capacitors and connectors are available for purchase from the following EU distributors:
●RS: Capacitors | RS Components (rs-online.com)
●tme: Transfer Multisort Elektronik
●Digi-Key: Digikey Electronics
Power board
Description
HP spare part number
Manufacturer part
number
PSU HP 27mq
M84482-001
ADPCJ1903AA2
Capacitors by distributor
Component description
Location
Component distributor
Distributor part number
EC 470UF 20% 25V 10*16
ED/EC 470UF 20% 25V
10*16 -- 1.21A ECR1EXX4
C916
Digi-Key
EEU-FM1E471
EC 470UF 20% 25V 10*16
ED/EC 470UF 20% 25V
10*16 -- 1.21A ECR1EXX4
C917
Digi-Key
RZW471M1EBK-1016S
Connectors by manufacturer
Component description
Location
identifier
Component
distributor
Distributer part
number
D-SUB
CN101
tme
HDL15-SL-B
(ADAM TECH)
HDMI
CN503
RS
SD-47151-001
(Molex)
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.
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.

9
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:

10
RC
Before removing the RC, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 9.
Step
Figure
Description
1．Preparation
and remove the
stand-base
ass'y
Lay the monitor
on a flat, soft
and clean
surface.
Remove the
screws to
remove the
stand-base
assy.
2．Remove the
rear cover
Remove the
rear cover
3. Disconnect
the cable and
the tape
Disconnect the
cable and the
tape

11
4. Disconnect
the tapes and
remove the
screws. Remove
the Led Board
Disconnect the
tapes and
remove the
screws.
Remove the
LED Board
5. Remove the
screws and
disconnect the
pins.
\
Remove the
screws and
disconnect the
pins.

12
6. Remove the
main board and
the power board
Remove the
mylar. remove
the screws to
remove the
main board and
the power
board.
7. Disconnect
the pins
Disconnect the
pins
Main Board
Main Board
Power Board
Main Board
Power Board
Main Board
Power Board

13
8. The
Mainframe
The Mainframe
9. Remove the
screws to
remove the key
board
Remove the
screws to
remove the key
board
10. The Rear
Cover
The Rear
Cover

14
11. The panel
and the bezel
The panel and
the Bezel.

15
Power board
The power board part number is ADPCJ1903AA2
Before removing the power board, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 9.
Remove the power board:
1) The HP 27mq power board connector position is as follows:
2) Locate the part number location on the board.
Power Board
Power Board
Warning: After unplugging the
power supply, the capacitance
is still charged, do not touch
and discharge the capacitor.

16
Connector repair
This procedure includes HDMI and D-SUB connectors.
The connectors are on the main board (board part number CBPRNE7HPQ7).
The connectors identifiers are as follows:
Connector
Location
HDMI
CN503
D-SUB
CN101
Before repairing connectors, follow these steps:
▲Prepare the monitor for disassembly. See Preparation for disassembly on page 9.
Main Board
Main Board
CN101
CN503

17
IMPORTANT:
• Repair Condition: Connector repair is only for out of warranty.
• Repairing must operate by professional repairers (Note) in repair center, not applicable for
end user.
• Electrostatic protection is required when component replacement is required.
• The monitor meets ROHS, please use Lead-free solder wire for soldering.
• If Connector need to replace, must check specification and part number whether match the
BOM and location.
• If connector need to replace, please insert new parts carefully because the near pin may
cause short circuit by inappropriate operate.
• DO NOT allow any liquid on the board. Water and moisture may cause short-circuit to the
electronic components and lead to malfunctions.
• The fusion point of Lead-Free solder is requested. Repairing with conventional lead wire may
cause damage.
• Work quickly to avoid overheating the circuit board as soon as you confirm the steady
soldering condition.
• Keep the soldering iron tip clean and well tinned and when replacing parts.
• A close inspection of the circuit board revealed look in good condition.
• After repaired, must connect source to each port to check Main board function is ordinary.
Note: (The requirement of professional repairers’ regulation by ERP lot5)
1) The professional repairer has the technical competence to repair electronic displays and
complies with the applicable regulations for repairers of electrical equipment in the Member
States where it operates. Reference to an official registration system as professional repairer,
where such system exists in the Member States concerned, shall be accepted as proof of
compliance with this point.
2) The professional repairer is covered by insurance covering liabilities resulting from its activity,
regardless of whether this is required by the Member State.
HDMI connector CN503
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.