HP P22h G4 Manual

Maintenance and Service Guide
P22h G4 model
L73872
P24h G4 model
L73925
P27h G4 model
L73994
P22 G4 model
L73872
P24 G4 model
L73925
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:
L73872-P22h G4-MSG-V2
Assembly part number:
L73872-001
L73925-001
L73994-001
L73872-002
L73925-002
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 ............................................................................................................................................................. 4
Important safety information................................................................................................................................ 4
Important service information and precautions .................................................................................................... 4
RoHS (2002/95/EC) requirements.......................................................................................................................... 5
General descriptions .............................................................................................................................................. 5
Firmware updates .................................................................................................................................................. 5
Before returning the repaired product to the customer ....................................................................................... 5
2Monitor features........................................................................................................................................................... 6
Features ................................................................................................................................................................. 6
Front components .................................................................................................................................................. 7
Rear components ................................................................................................................................................... 8
Locating the serial number and product number .................................................................................................. 9
3Illustrated parts catalog ............................................................................................................................................ 11
How to order parts ............................................................................................................................................... 21
4Removal and replacement procedures ...................................................................................................................... 22
Preparation for disassembly................................................................................................................................ 22
Rear Cover ............................................................................................................................................................ 22
Connector repair .................................................................................................................................................. 40
VGA P101 .................................................................................................................................................. 43
HDMI connector P300 ............................................................................................................................... 44
Function test ........................................................................................................................................................ 45
Function test ........................................................................................................................................................ 45
Support and troubleshooting .............................................................................................................................. 45
Index..................................................................................................................................................................... 47

4
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.

5
●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.

6
2Monitor features
This chapter provides an overview of the monitor’s features.
Features
Depending on the model, your monitor might include the following features:
●54.6 cm (21.5 in) diagonal viewable screen area with 1920 × 1080 resolution, plus full-screen support
for lower resolutions; includes custom scaling for maximum image size while preserving original
aspect ratio
●60.45 cm (23.8 in) diagonal viewable screen area with 1920 × 1080 resolution, plus full-screen
support for lower resolutions; includes custom scaling for maximum image size while preserving
original aspect ratio
●68.6 cm (27 in) diagonal viewable screen area with 1920 × 1080 resolution, plus full-screen support
for lower resolutions; includes custom scaling for maximum image size while preserving original
aspect ratio
●Liquid crystal display (LCD) with active matrix and in-plane switching (IPS)
●Wide color gamut to provide coverage of sRGB color spaces
●Non-glare panel with an LED backlight
●Wide viewing angle to allow viewing from a sitting or standing position, or moving from side to side
●Wide viewing angle to allow viewing from a sitting or standing position, or moving from side to side
●Tilt and height adjustment capabilities (select models only)
●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
●VGA video input
●Audio-in jack (select models only)
●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
●On-screen display (OSD) adjustments in several languages for easy setup and screen optimization
●HP Display Assistant software for adjusting monitor settings and enabling theft-deterrence features
●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.

7
Front components
To identify the components on the front of the monitor, use this illustration and table.
<Table 2-1>
Table 2-1: Front components and their descriptions
Component
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 16.
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. See Using Auto-Sleep Mode on page 16 for more
information.
NOTE: You can reconfigure the Function buttons in the OSD menu to quickly select the most commonly used operations.
Press the Menu button to open the OSD, and then select Menu Control. Select Assign buttons, and then select
one of the available options for the button you want to assign.

8
Rear components
To identify the components on the rear of the monitor, use this illustration and table.
<Table 2-2>
Table 2-3: Rear components and their descriptions
Component
Function
1 Power connector Connects an AC adapter.
2 Display connector Connects the DisplayPort cable to a source device
such as a computer or game console.
1 HDMI connector Connects the HDMI cable to a source device such
as a computer or game console.
2 VGA connector Connects a VGA cable from the monitor to a source
device such as a computer.
3 Audio-in jack (select model only) Connects an audio source device.
4 Security cable slot Connects an optional security cable.

9
Locating the serial number and product number
The rating labels on the monitor provide the spare part number, product number, and serial number. You may need
these numbers when contacting HP about the monitor model. The rating labels are located on the bottom side of the
monitor display head.
For worldwide models:
Rating label
Rating label
Safety label

10
Safety label

11
3Illustrated parts catalog
To identify the monitor major components, use this illustration and table.
P22h G4
<Table 3-1>
Item Description Qty
1 21.5 LCM milky way （ES 8.0）1
2 MAC. SCREW-MI M4.0*10 ,Blk-Zn 4
3 TAP.SCREW-T1 M2.0*3.0L,NI 3
4 DISPLAY BD ASS'Y HP MilkyWay 1
5 FRONT DECO(ABS 94-HB/Jack Black(6009-
0337))(HP MILKY WAY P22h G4)ASS'Y
1
6 MYLAR BLACK(96*55*0.325t) 1
7 MAC. SCREW-MRF M3.0*6.0L, BLK-Ni 7
8 MAIN BD ASS'Y HP MilkyWay P22h G4
(LM215WF3-RSAU1)
1

12
9
MYLAR BLACK(40*26*0.3t)
1
10
A
-D PSU 1.3 A 19V (ADO-25W1-A
19(x)_120x70mm)_HP Milkway
1
11
MAIN SHIELDING (SECC
0.5T)( HP Milky Way
A1H1DP1AUDIO )
1
12
MAC. SCREW
-MI M3.0*4.0L, BLK-Ni 4
13
MAC. SCREW
-MH #4-40*5.0L,Ni 2
14
BACK COVER(ABS 94
-HB/Jack Black(6009-
0337))(HP MILKY WAY P22h G4)
1
15
NECK(HP Milky Way P22h G4)(Jack Black)_CX
1
16
BASE(HP MILKY
WAY P27h G4)(JACK BLACK)_CX 1
17
WH FFC 30P(0.5mm) 350mm(3FOLD)60V G/F
W/CONN(A15+BC)+AL(AA) HF OP
1
18
WH FFC 8P(0.5mm) 430mm(2FOLD+PRO)60V G/F
(A8+A12/V
-CUT) HF
1
19
WH A1007H00
-6P/A1251-H06 #28 420mm W/B
HF
1
20
MAC.SCREW
-PH-LWM4*6L NI 1
21
CR
SPONGE(L480*W5*0.3t)(P22h G4) 1
22
Key Button(ABS 94
-HB/Jack Black(6009-
0337))( HP Milky Way )
1
23
LENS(PC122/TRANSPARENT)(HP Milky Way )
1
24
SPK COVER(ABS 94
-HB/Jack Black(6009-
0337))(HP Milky Way )
1

13
P24h G4
<Table 3-4>
Item Description Qty
1
23.8 LCM milky way
（ES 8.0）1
2
MAC. SCREW
-MI M4.0*10 ,Blk-Zn 4
3
TAP.SCREW
-T1 M2.0*3.0L,NI 3
4
DISPLAY BD ASS'Y HP MilkyWay
1
5
FRONT DECO(ABS 94
-HB/Jack Black(6009-0337))(HP Milky Way P24h G4) 1
6
MYLAR BLACK(96*55*0.325t)
1
7
MAC. SCREW
-MRF M3.0*6.0L, BLK-Ni 7
8
MAIN BD ASS'Y HP MilkyWay P24h G4(LM238WF2
-RSAU1) 1
9
MYLAR BLACK(40*26*0.3t)
1
10
A
-D PSU 1.3 A 19V (ADO-25W1-A 19(x)_120x70mm)_HP Milkway 1
11
MAIN SHIELDING (SECC
0.5T)( HP Milky Way 1A1H1DP1AUDIO ) 1
12
MAC. SCREW
-MI M3.0*4.0L, BLK-Ni 4

14
13
MAC. SCREW
-MH #4-40*5.0L,Ni 2
14
BACK
COVER (ABS 94-HB/Jack Black(6009-0337))(HP Milky Way P24h G4) 1
15
NECK(HP Milky Way P24h G4)(Jack Black)_CX
1
16
BASE(HP MILKY
WAY P27h G4)(JACK BLACK)_CX 1
17
WH FFC 30P(0.5mm) 350mm(3FOLD)60V G/F W/CONN(A15+BC)+AL(AA) HF OP
1
18
WH FFC 8P(0.5mm) 430mm(2FOLD+PRO)60V G/F (A8+A12/V
-CUT) HF 1
19
WH A1007H00
-6P/A1251-H06 #28 420mm W/B HF 1
20
MAC.SCREW
-PH-LWM4*6L NI 1
21
CR
SPONGE(L526*W5*0.3t)(P24h G4) 1
22
Key Button(ABS 94
-HB/Jack Black(6009-0337))( HP Milky Way ) 1
23
LENS(PC122/TRANSPARENT)(HP Milky Way )
1
24
SPK COVER(ABS 94
-HB/Jack Black(6009-0337))(HP Milky Way ) 1
25
SPK 3W 4ohm 68.9*54.7*21.3mm(R440mm*L190mm) (PB25CCG04
-11-
9JB2)VECO for Milkyway HF
1
26
MAC. SCREW
-MPHW M3.0*5 ,NI 4

15
P27h G4
<Table 3-3>
Item Description Qty
1
27 LCM milky way
（ES 8.0）1
2
MAC. SCREW
-MI M4.0*10 ,Blk-Zn 4
3
TAP.SCREW
-T1 M2.0*3.0L,NI 3
4
DISPLAY BD ASS'Y HP MilkyWay
1
5
FRONT DECO(ABS 94
-HB/Jack Black(6009-0337))(HP MILKY WAY P27h G4) 1
6
MYLAR BLACK(96*55*0.325t)
1
7
MAC. SCREW
-MRF M3.0*6.0L, BLK-Ni 7
8
MAIN BD ASS'Y HP MilkyWay P27h G4(LM270WF5
-RSAU1) 1
9
MYLAR
BLACK(40*26*0.3t) 1
10
A
-D PSU 1.84 A 19V (ADO-35W1-A 19(x)_120x70mm)_HP Milkway 1
11
MAIN SHIELDING (SECC 0.5T)( HP Milky Way 1A1H1DP1AUDIO )
1
12
MAC. SCREW
-MI M3.0*4.0L, BLK-Ni 4
13
MAC. SCREW
-MH #4-40*5.0L,Ni 2

16
14
BACK COVER(ABS 94
-HB/Jack Black(6009-0337))(HP MILKY WAY P27h G4) 1
15
NECK(HP MILKY WAY P27h G4)(JACK BLACK)_CX
1
16
BASE(HP MILKY WAY P27h G4)(JACK BLACK)_CX
1
17
WH FFC 30P(0.5mm) 350mm(3FOLD)60V G/F W/CONN(A15+BC)+AL(AA) HF OP
1
18
WH FFC 8P(0.5mm) 430mm(2FOLD+PRO)60V G/F
(A8+A12/V-CUT) HF 1
19
WH A1007H00
-6P/A1251-H06 #28 420mm W/B HF 1
20
MAC.SCREW
-PH-LWM4*6L NI 1
21
FRONT DECO(HP MILKY WAY P27h G4)
1
22
Key Button(ABS 94
-HB/Jack Black(6009-0337))( HP Milky Way ) 1
23
LENS(PC122/TRANSPARENT)(HP Milky Way )
1
24
SPK COVER(ABS 94
-HB/Jack Black(6009-0337))(HP Milky Way ) 1
25
SPK 3W 4ohm 68.9*54.7*21.3mm(R440mm*L190mm) (PB25CCG04
-11-
9JB2)VECO for Milkyway HF
1
26
MAC. SCREW
-MPHW M3.0*5 ,NI 4

17
P22 G4
<Table 3-4>
Item Description Qty
1
21.5 LCM milky way
（ES 8.0）change fixed base 1
2
MAC. SCREW
-MI M4.0*10 ,Blk-Zn 4
3
TAP.SCREW
-T1 M2.0*3.0L,NI 3
4
DISPLAY BD ASS
’Y HP MilkyWay 1
5
FRONT DECO(ABS 94
-HB/Jack Black(6009-
0337))(HP MILKY WAY P22h G4)ASS
’Y
1
5-1
CR SPONGE(L480*W5*0.3t)(P22h G4)
1
5-2
Key
Button(ABS 94-HB/Jack Black(6009-
0337))( HP Milky Way )
1

18
5-3
LENS(PC122/TRANSPARENT)(HP Milky Way )
1
5-4
SPK COVER(ABS 94
-HB/Jack Black(6009-
0337))(HP Milky Way )
1
5-5
FRONT DECO(ABS 94
-HB/Jack Black(6009-
0337))(HP MILKY WAY P22h G4)
1
6
MYLAR
BLACK(96*55*0.325t) 1
7
MAC. SCREW
-MRF M3.0*6.0L, BLK-Ni 7
8
MAIN BD ASS'Y HP MilkyWay P22h G4
(LM215WF3
-RSAU1)
1
9
MYLAR BLACK(40*26*0.3t)
1
10
A
-D PSU 1.3 A 19V (ADO-25W1-A
19(x)_120x70mm)_HP Milkway
1
11
MAIN SHIELDING (SECC 0.5T)( HP Milky Way
A1H1DP1AUDIO )
1
12
MAC. SCREW
-MI M3.0*4.0L, BLK-Ni 4
13
MAC. SCREW
-MH #4-40*5.0L,Ni 2
14
BACK COVER(HP MW Fixed Stand P22 G4)
1
15
NECK(HP Milky Way P22 G4)(Jack Black)_CX
1
16
BASE(HP Milky Way P22 G4)(Jack Black)_CX
1
17
WH FFC 30P(0.5mm)
350mm(3FOLD)60V G/F
W/CONN(A15+BC)+AL(AA) HF OP
1
18
WH FFC 8P(0.5mm) 430mm(2FOLD+PRO)60V G/F
(A8+A12/V
-CUT) HF
1
19
WH A1007H00
-6P/A1251-H06 #28 420mm W/B
HF
1
20
MAC.SCREW
-PH-LWM4*6L NI 1
21
Cable management (HP Milky Way P27 G4)(Jack
Black)_CX
1
22
VESA COVER (ABS 94
-HB/Jack Black(6009-
0337))(HP MW Fixed Stand P24 G4)
1
23
PU SPONGE(L80*W18*12T)(P27h G4)
1
24
Hinge Hold Assy ( HP Milky Way Fixed Stand )
1
24-1
Release Butto
n (POM/Jack Black(6009-0337))(HP
MW Fixed Stand P24 G4)
1
24-2
Hinge
Hold(SGCC 2.0t)( HP Milky Way Fixed Stand ) 1
24-3
TAP. SCREW
-TF #3.0*6.0L,Ni 1
25
MAC. SCREW
-MI M3.0*6.0L, BLK-ZNNI(HEAD
DIAMETER 7.0)
1
26
SPONGE(AEPE/L110*W4*D1.0)(BLK)
1

19
P24 G4
<Table 3-5>
Item Description Qty
1
2
3.8 LCM milky way （ES 8.0）change fixed base 1
2
MAC. SCREW
-MI M4.0*10 ,Blk-Zn 4
3
TAP.SCREW
-T1 M2.0*3.0L,NI 3
4
MAC.SCREW
-PH-LWM4*6L NI 1
5
FRONT DECO(ABS 94
-HB/Jack Black(6009-
0337))(HP Milky Way P24h G4)
1
6
MYLAR BLACK(40*26*0.3t)
1
7
MAC. SCREW
-MRF M3.0*6.0L, BLK-Ni 7
8
MAIN BD ASS'Y HP MilkyWay fixed stand P24 G4
(LM238WF2-RSAU1)
1

20
9
MYLAR BLACK(40*26*0.3t)
1
10
A
-D PSU 1.32 A 19V (ADO-25W1-A
19(x)_120x70mm)_HP Milkway
1
11
MAIN SHIELDING (SECC 0.5T)( HP Milky Way
1A1H1DP1AUDIO )
1
12
MAC. SCREW
-MI M3.0*4.0L, BLK-Ni 6
13
MAC. SCREW
-MH #4-40*5.0L,Ni 2
14
BACK COVER (ABS 94
-HB/Jack Black(6009-
0337))(HP MW Fixed Stand P24 G4)
1
15
NECK(HP Milky Way P22 G4)(Jack Black)_CX
1
16
BASE(HP Milky Way P22 G4)(Jack Black)_CX
1
17
WH
FFC 30P(0.5mm) 350mm(3FOLD)60V G/F
W/CONN(A15+BC)+AL(AA) HF OP
1
18
WH FFC 8P(0.5mm) 430mm(2FOLD+PRO)60V G/F
(A8+A12/V-CUT) HF
1
19
WH A1007H
00-6P/A1251-H06 #28 420mm W/B
HF
1
20
FRONT DECO(ABS 94
-HB/Jack Black(6009-
0337))(HP Milky Way P24h G4)ASS'Y
1
20-1
FR
FRONT DECO(ABS 94-HB/Jack Black(6009-
0337))(HP Milky Way P24h G4)
1
20-2
CR SPONGE(L480*W5*0.3t)(P22h G4)
1
20-3
Key Button(ABS 94
-HB/Jack Black(6009-
0337))( HP Milky Way )
1
20-4
LENS(PC122/TRANSPARENT)(HP Milky Way )
1
20-5
SPK COVER(ABS 94
-HB/Jack Black(6009-
0337))(HP Milky Way )
1
21
Hinge Hold Assy ( HP Milky Way Fixed Stand )
1
21-1
Hinge Hold(SGCC 2.0t)( HP Milky Way Fixed Stand )
1
21-2
TAP. SCREW
-TF #3.0*6.0L,Ni 1
21-3
Release Butto
n (POM/Jack Black(6009-0337))(HP
MW Fixed Stand P24 G4)
1
22
SPONGE(AEPE/L110*W4*D1.0)(BLK)
1
23
PU SPONGE(L80*W18*12T)(P27h G4)
1
24
WH A2501
-H04/A2501-H04 #24 80mm HF 1
25
Cable management (HP Milky Way P27 G4)(Jack
Black)_CX
1
26
VESA COVER (ABS 94
-HB/Jack Black(6009-
0337))(HP MW Fixed Stand P24 G4)
1
27
MAC. SCREW
-MI M3.0*6.0L, BLK-ZNNI(HEAD
DIAMETER 7.0)
1