Dell P2424HEB User manual

Version: 01
Date: 2023/09/05
Service Manual - P2424HEB

Qualified Repairability:
! To prevent the product away from water or
expose in extremely high humility environment.
NOTICE:
! To ensure the continued reliability of this
product, use only original manufacturer’s
specified parts.
Product Announcement:
! To avoid electrical shocks, the products should be
connected to an authorized power cord, and turn
off the master power switch each time before
removing the AC power cord.
Proper service and repair is important to the safe,
reliable operation of all series products. The
service providers recommended by vender should
be aware of notices listed in this service manual in
order to minimize the risk of personal injury when
perform service procedures. Furthermore, the
possible existed improper repairing method may
damage equipment or products. It is recommended
that service engineers should have repairing
knowledge, experience, as well as appropriate
product training per new model before performing
the service procedures.
This product is certificated to meet RoHS
Directive and Lead-Free produced definition.
Using approved critical components only is
recommended when the situation to replace
defective parts. Vender assumes no liability
express or implied, arising out of any unauthorized
modification of design or replacing non-RoHS
parts. Service providers assume all liability.
! To ensure following safety repairing behavior, put
the replaced part on the components side of
PWBA, not solder side.
! To ensure using a proper screwdriver, follow the
torque and force listed in assembly and
disassembly procedures to unscrew screws.
! Using Lead-Free solder to well mounted the
parts.
! The fusion point of Lead-Free solder requested in
the degree of 220°C.
1. Important Safety Notice

2. Exploded view diagram with list of items
2. Verify your country or region in the Choose A Country/Region drop-down menu at the bottom-right corner of the page.
NOTE:
For replacement of power cord, connectivity cable and external power supply (if applicable), contact Dell:
1. Go to https://www.dell.com/support.
5. Choose the method of contacting Dell that is convenient for you.
3. Click Contact Us next to the country dropdown.
4. Select the appropriate service or support link based on your need.
16 17 18 19
1 2 3 4 5 6 7 11 12
10
8
9
13
14
15
ItemDescriptionQ'tyRemark
11
ForEMEAOnly,notfor
otherregions
2
Power Board
1
13
41
15
6
Speaker
1
1 7
81
9
10
111
1
Main Chassis ASSY
12
1 13
1 14
Front Trim
Middle Frame
Webcam Module
Interface Board
1
1
151
1
Safety Mylar
16
Rear Cover ASSY
Stand Riser
Panel
1
17 1
18
19
1
1
See “NOTE”
See “NOTE”
See “NOTE”
See “NOTE”
USB 3.2 Gen1 1.8 M Type A to Type B cable upstream cable
Power cable
DisplayPort 1.8 M cable
Lens
USB Board
Micphone Board
Joystick Board
Base
USB-C Gen1 1.8 M cable (C to C)(For P2424HEB only)

3. Wiring Connectivity Diagram
AC In
PW R& LED
D river BD
Panel: 27 inch
1920*1080
U SB-C Up
DP1.4
HD M I1.4
HDCP1.4
DP In 1.2
HDCP 1.4
DP Ou t 1.2
HDCP1.4
4M RGB+IR camera
+TOF
Manual Shutter
USB
Down
Stream
#2
USB
Down
Stream
#1
LAN1
Speaker
2*5 W
Joys tick +Power Key
Capacity
Touch key
USBB
2 Digital Mic
U SB A
Dow n
S trea
m #4
U SB C
Dow n
S trea
m #3
H ead
phon e
USB Board
P2424HEB

4. How to connect and disconnect power cable/ connectivity cable
WARNING: To change power cable/ connectivity cable, switch off power before unplugging the cable and replugging in required
cable.
1118-1520-6788-7992-5652-1496

4. How to connect and disconnect power cable/ connectivity cable

4. How to connect and disconnect power cable/ connectivity cable

5. Disassembly and Assembly Procedures
5.1 Disassembly Procedures:
- Screwdriver(Phillip head) #1
- Penknife
- Soldering iron and absorber
Tool Required:
List the type and size of the tools that would typically can be
used to disassemble the product to a point where components
and materials requiring selective treatment can be removed.
Tool Description:
- Screwdriver(Phillip head) #2
NOTE:
This “Disassembly and Assembly Procedures” is for EMEA only,
not for other regions. Please note that Dell will deem warranty void
if any disassembly is done on the monitors.
S3
S2
S1
S1 1. Place the monitor on a soft cloth or cushion.
3. Lift the stand up and away from the monitor.
Remove the monitor stand base:
2. Press and hold the stand-release button.
Use a Philips-head screwdriver to remove 4pcs
screws for unlocking mechanisms. Remove DP cap.
(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)
S6
S4
S5
Wedge your fingers between rear cover and the
middle bezel on the corners of the top side of the
monitor to release the rear cover, then use one hand
to press the middle bezel, the other hand to pull up
carefully the rear cover in order of arrow preference
for unlocking mechanisms of rear cover.
3
2
1
2
Lift the rear cover up carefully. Disconnect the
joystick key cable from the connector of the main
board, and then remove the rear cover and put it
aside for later disassembling.
(No.1~3 screw size=M2x3.3, Torque=1±0.2kgfxcm)
Use a Philips-head screwdriver to remove 3pcs screw
for unlocking the joystick board, then tear off all the
tapes and release the joystick cable.
23
41
2
1
3
Tear off 2pcs aluminum foil and 4pcs acetate tape
for releasing the cables, then release the speaker’s
cables away from the hooks of the middle frame.
2
1
3

5. Disassembly and Assembly Procedures
S10
S9
S11
S12
S8
S7
Tearing off 2pcs aluminum foil for releasing the
connector and cable. Use a Philips-head screwdriver
to remove 6pcs screws for unlocking the speakers
with middle frame.
(No.1~6 screw size=M3x6, Torque=4~5kgfxcm)
Disconnect the speaker cable away from the board,
then release the speakers from the probers of the
middle frame. Disconnect the panel lamp cable away
from the connectors of the main board and panel.
No.3~4 Screw size= M3x8, Torque=6±0.5kgfxcm)
(No.1~2 Screw size= M3x3.5, Torque=3±0.5kgfxcm;
Use a Philips-head screwdriver to remove 4pcs
screws for unlocking the camera module with the
middle bezel, then disconnect the camera cable from
the connector.
Use a Philips-head screwdriver to remove 1pcs
screw for unlocking the USB unit with the middle
frame, then disconnect the two USB cables and Mic
cable away from the connectors of main board.
Release the USB board away from the hook of the
middle frame.
(No.1 screw size=M3x3,5, Torque=4 0.5 kgfxcm)±
1
2
4
1
5
36
Use a Philips-head screwdriver to remove 4pcs
screws for unlocking the bracket chassis with the
panel, then disconnect the touch cable away from
the connector of the main board.
(No.1~4 Screw size= M3x4, Torque=5±1kgfxcm )
2
1
4
3
2
1
4
3
Disconnect the LVDS cable away from the connector
of the panel module, then lift up and take away the
bracket chassis and put it on a protective cushion.

5. Disassembly and Assembly Procedures
S13
S15
S16
S14
Lift up the middle bezel away from the pane module,
then put it on a cushion foam for later disassembling.
Release the assembled camera unit from the
probers of the middle frame and put it aside for later
disassembling.
No.12~13 screw size=M2x3.3,Torque=1±0.2kgfxcm)
Tear off 2pcs aluminum foil to release the Mic boards
Use a Philips-head screwdriver to remove 13pcs
screws for unlocking the middle frame with the panel.
(No.1~11 screw size=M3x4,Torque=3±0.5kgfxcm;
10
7
9
3
45
621
11
8
12 13
(No.1~4 screw size=M2x3.3,Torque=1±0.2kgfxcm)
Use a Philips-head screwdriver to remove 4pcs
screws for unlocking the left and right Mic boards
with the middle frame, then release the two Mic
boards away from the middle frame.
3
1
24
Release the touch key cable away from the panel,
then disassemble the front bezel with the panel, then
tear off the mylar tape and release the touch board.
S17

5. Disassembly and Assembly Procedures
S20
S18
S19
Use a Philips-head screwdriver to remove 7pcs
screws for interface board and power board. Turn
over the bracket and disconnect the camera cable.
(No.1 screw size=M4x8, Torque=7.5±0.5kgfxcm;
No.2~7 screw size=M4x8, Torque=7.5±0.5kgfxcm)
Turn over the bracket and remove the power board
and interface board from the bracket chassis module
carefully, and then disconnect all of the cables.
Remove the Mylar tape from the hooks of the
bracket chassis.
13
2
7
5
6
4

5. Disassembly and Assembly Procedures
5.2 Assembly Procedures:
Turn over a power board and put the power board
into the bracket chassis, settle the panel power
cable to the correct position.
Place a bracket chassis base on a protective
cushion, then stick 7pcs Silicon sheets on the
positions as the picture below shown.
S2
S1
Turn over the bracket chassis, and then take 1pcs
black mylar to insert the hooks of the bracket
chassis to cover the power board.
S4
Take a interface board, connect 1pcs LVDS cable to
the connector of the interface board, then connect
the cable of the power board to the connector of the
interface board. Turn over the interface board and
locate it into the main chassis. Use a Philips-head
screwdriver to tighten 7pcs screws for locking the
interface board and power board. Turn over the
chassis and connect 1pcs cable to the connector.
No.2~7 screw size=M4x8, Torque=7.5±0.5kgfxcm)
(No.1 screw size=M4x8, Torque=7.5±0.5kgfxcm;
S3
Panel preparation: Take out 1pcs panel module from
the carton, remove the protective film by tearing off
the tapes, then Examine the panel surface
according to inspection criteria. Turn over the panel
to place screen faced down for later assembling.
S5
Take1pcs touch board,1pcs key cable and 1pcs front
bezel, then connect the key cable to the connector
of the board. Tear off the release paper and paste
the touch board on the correct position of the front
bezel, then paste 1pcs mylar to cover the touch
board. Move the front bezel close to the panel
module, then assemble the front bezel with the panel
module.
S6
13
2
7
5
6
4

5. Disassembly and Assembly Procedures
S8
S10
S7
Tear off the release paper on the back of the touch
cable and then fix the cable on the back of the panel.
Move the middle frame with Mic boards close to the
panel unit, then assemble the middle bezel unit with
the front bezel and panel module.
S9
Take 1pcs left Mic board,1pcs right Mic board and
some essential cables, then assemble 1pcs rubber
with left Mic board and assemble 1pcs rubber with
right Mic board, then connect left Mic board right Mic
board with cables as the picture below shown.
Use a Philips-head screwdriver to lock 11pcs screws
for locking the middle frame unit with the panel, then
paste 2pcs aluminum foil to fix the Mic board.
(No.1~11 screw size=M3x4,Torque=3±0.5kgfxcm)
10
7
9
3
45
621
11
8
(No.1~4 screw size=M2x3.3,Torque=1±0.2kgfxcm)
Take 1pcs middle frame with speaker cover, then put
the middle frame and locate the Mic boards to the
correct positions, then use a Philips-head screwdriver
to lock 4pcs screws for locking the left and right Mic
boards as the picture below shown.
rubber
rubber
3
1
24

5. Disassembly and Assembly Procedures
S12
Connect the camera cable to the camera board, then
use a Philips-head screwdriver to tighten 4pcs
screws for locking the camera unit with the frame.
(No.1~2 Screw size= M3x3.5, Torque=3±0.5kgfxcm;
No.3~4 Screw size= M3x8, Torque=6±0.5kgfxcm)
S14
Use a Philips-head screwdriver to tighten 6pcs
screws for locking the two speakers with the middle
frame, then paste 2pcs aluminum foil on the specific
positions to cover the LVDS connector and cables.
(No.1~6 Screw size= M3x6, Torque=4~5kgfxcm)
S15
S11
Take 1pcs camera unit assembled in LCM line, then
locate the camera unit into the pins of the middle
frame.
Move the bracket and put it on the back of panel,
then connect the LVDS cable to the connector of the
panel module.
S13
Use a Philips-head screwdriver to tighten 4pcs
screws for locking the bracket chassis with the
panel, then connect the touch cable to main board.
(No.1~4 Screw size= M3x4, Torque=5±1kgfxcm )
2
1
4
3
2
1
Take a pair of speakers to locate the probers of the
middle frame, then locate the speakers’ cable to the
hooks of the middle bezel, and then connect the
speaker’s cable to the connector of the main board.
Take 1pcs panel lamp cable to connect the main
board with the panel.
S16
2
4
1
5
36
4
3

5. Disassembly and Assembly Procedures
Locate the speakers’ cable into the hooks of the
middle frame and paste 2pcs aluminum foil and 4pcs
acetate tape on the specific positions for fixing the
cables as the picture below shown.
Take 1pcs USB board, 2pcs cables and 1pcs
conductive foam. Connect the 2pcs cables to the
connectors of the USB board, then turn over the
board and paste the conductive foam on the back of
the USB board.
S17
S19
S18
Take 1pcs joystick key, 1pcs joystick board and 1pcs
key cable, then assemble the joystick key with board
and connect the key cable to the connector of the
key board.
S20
Locate the USB board into the hook of the middle
frame. Use a Philips-head screwdriver to tighten
1pcs screw for locking the USB unit with the middle
frame, then connect the two USB cables and Mic
cable to the connectors of main board.
(No.1 screw size=M3x3.5, Torque=4 0.5 kgfxcm)±
1
Use a Philips-head screwdriver to tighten 2pcs
screws for locking the middle frame with panel and
front bezel.
(No.1~2screw size=M2x3.3,Torque=1±0.2kgfxcm)
21
Locate the joystick board to the correct position of
the rear cover, then use a Philips-head screwdriver
to tighten 3pcs screws for locking the joystick board
with rear cover, fix the key cable on the rear cover by
3pcs adhesive tapes on the back of the cable.
(No.1~2 screw size=M2x3.3,Torque=1±0.2kgfxcm)
S21
S22
2
1
3

5. Disassembly and Assembly Procedures
Insert a DP out Cap into the DP out connector. Take
a stand base close to the monitor. Fit the two tabs
on the upper part of the stand into the grooves, and
then lower the stand so that the monitor mounting
area snaps onto the stand.
Lift up the monitor to check the gap between the
front bezel and the panel, then provide power supply
and a video signal to the monitor, then turn on the
monitor for functionality check.
S23
S24
S25
(No.1~4 screw size=M4x11; Torque=11±1kgfxcm)
Use a Philips-head screwdriver to tighten 4pcs
screws for locking the rear cover with the unit. Paste
2pcs label on the specific positions.
23
1
S26
Move the assembled rear cover close to the panel
unit, then connect the joystick cable to the
connector of interface board. Put down the rear
cover and push the rear cover on the positions
marked as the picture below shown for
mechanisms engagement.
4

6. Trouble Shooting Instructions
Troubleshooting
WARNING: Before you begin any of the procedures in this section, follow
the Safety Instructions.
Self-test
Your monitor provides a self-test feature that allows you to check whether your
monitor is functioning properly. If your monitor and computer are properly connected
but the monitor screen remains dark, run the monitor self-test by performing the
following steps:
1. Turn o both your computer and the monitor.
2. Unplug the video cable from the back of the computer. To ensure proper Self-Test
operation, remove all digital and the analog cables from the back of computer.
3. Turn on the monitor.
The oating dialog box should appear on-screen (against a black background), if the
monitor cannot sense a video signal and is working correctly. While in self-test mode,
the power LED remains white. Also, depending upon the selected input, one of the
dialogs shown below will continuously scroll through the screen.
No DP Cable
The display will go into Standby Mode in 4 minutes.
Dell.com/support/P2424HEB
or
No USB-C Cable
The display will go into Standby Mode in 4 minutes.
Dell.com/support/P2424HEB
4. This box also appears during normal system operation if the video cable becomes
disconnected or damaged.
5. Turn o your monitor and reconnect the video cable; then turn on both your
computer and the monitor.
If your monitor screen remains blank after you use the previous procedure, check your
video controller and computer, because your monitor is functioning properly.

6. Trouble Shooting Instructions
Built-in diagnostics
Your monitor has a built-in diagnostic tool that helps you determine if the screen
abnormality you are experiencing is an inherent problem with your monitor, or with your
computer and video card.
Exit
24 Monitor
Input Source
Color
Brightness/Contrast
Display
Personalize
Others
Menu
USB
Audio & Webcam
Display Info
Reset Others
Factory Reset
Firmware M2T101
Service Tag ABCDEFG
DDC/CI On
LCD Conditioning O‡
ENERGY STAR®
Select √
Self-Diagnostic Select √
To run the built-in diagnostics:
1. Ensure that the screen is clean (no dust particles on the surface of the screen).
2. Select OSD items of Self-Diagnostics in Others feature.
3. Press the joystick button to start the diagnostics. A gray screen is displayed.
4. Observe if the screen has any defects or abnormalities.
5. Toggle the joystick once again until a red screen is displayed.
6. Observe if the screen has any defects or abnormalities.
7. Repeat steps 5 and 6 until the screen displays green, blue, black, and white
colors. Note any abnormalities or defects.
The test is complete when a text screen is displayed. To exit, toggle the joystick control
again.
If you do not detect any screen abnormalities upon using the built-in diagnostic tool,
the monitor is functioning properly. Check the video card and computer.

6. Trouble Shooting Instructions
Common Problems
The following table contains general information about common monitor problems you
might encounter and the possible solutions:
Common
Symptoms
What you
experience
Possible solutions
No Video/
Power LED o
No picture • Ensure that the video cable connecting
the monitor and the computer is properly
connected and secure.
• Verify that the power outlet is functioning
properly using any other electrical equipment.
• Ensure that the power button is depressed
fully.
• Ensure that the correct input source is
selected in the Input Source menu.
No Video/
Power LED on
No picture or no
brightness
• Increase brightness and contrast controls via
OSD.
• Perform monitor self-test feature check.
• Check for bent or broken pins in the video
cable connector.
• Run the built-in diagnostics.
• Ensure that the correct input source is
selected in the Input Source menu.
Missing Pixels LCD screen has
spots
• Cycle power on-o.
• Pixel that is permanently o is a natural
defect that can occur in LCD technology.
• For more information on Dell Monitor Quality
and Pixel Policy, see Dell Support site at:
https://www.dell.com/pixelguidelines.
Stuck-on Pixels LCD screen has
bright spots
• Cycle power On-O.
• Pixel that is permanently o is a natural
defect that can occur in LCD technology.
• For more information on Dell Monitor Quality
and PixelPolicy, see Dell Support site at:
https://www.dell.com/pixelguidelines.
Brightness
Problems
Picture too dim or
too bright
• Reset the monitor to factory settings.
• Adjust brightness and contrast controls via
OSD.
Safety Related
Issues
Visible signs of
smoke or sparks
• Do not perform any troubleshooting steps.
• Contact Dell immediately.

6. Trouble Shooting Instructions
Common
Symptoms
What you
experience
Possible solutions
Intermittent
Problems
Monitor
malfunctions on
& o
• Ensure that the video cable connecting
the monitor to the computer is connected
properly and is secure.
• Reset the monitor to factory settings.
• Perform monitor self-test feature check to
determine if the intermittent problem occurs
in self-test mode.
Missing Color Picture missing
color
• Perform monitor self-test.
• Ensure that the video cable connecting
the monitor to the computer is connected
properly and is secure.
• Check for bent or broken pins in the video
cable connector.
Wrong Color Picture color not
good
• Change the settings of the Preset Modes
in the Color menu OSD depending on the
application.
• Adjust R/G/B value under Custom Color in
Color menu OSD.
• Change the Input Color Format to PC RGB or
YPbPr in the Color menu OSD.
• Run the built-in diagnostics.
Image retention
from a static
image left on
the monitor for
a long period of
time
Faint shadow from
the static image
displayed appears
on the screen
• Set the screen to turn o after a few minutes
of screen idle time. These can be adjusted in
Windows Power Options or Mac Energy Saver
setting.
• Alternatively, use a dynamically changing
screensaver.
Mic/Webcam
does not work
• USB cable
not plug in or
not select the
correct USB
source
• Not set the
monitor Mic/
webcam as the
default device
• Plug in the USB Cable (Type-A to Type-B or
Type-C to Type-C), and if you connect both
USB-C port, please switch the USB source in
the OSD menu.
• Select the monitor Mic/webcam as the
default in the PC side.
• Touch the Mic button and make sure the Mic
mute LED is dark.