Dell U4320Q Instructions for use

Product Announcement:
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.
Qualified Repairability:
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.
NOTICE:
! 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.
! To prevent the product away from water or
expose in extremely high humility environment.
! To ensure the continued reliability of this
product, use only original manufacturer’s
specified parts.
! 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
Mid frame
key board Speaker
Panel Inter face board
Power board
Min bracket Rear cover
Stand
Usb board

3. Wiring Connectivity Diagram
2nwoD0.3BSU1nwoD0.3BSUtuooiduACepyTnI4.11PDnI0.21IMDHAC In
Power Board
Panel
Function Key Board
TypeC
Down
USB3.0
Down3
DP 1.4 InHDMI 2.0 In
Interface Board
Speaker
USB Board

4. Disassembly and Assembly Procedures
S2
4.1 Disassembly Procedures:
S1
S3
S6
S5
S4
Remove the monitor stand base:
1. Place the monitor on a soft cloth or cushion.
2. Press and hold the stand-release button.
3. Lift the stand up and away from the monitor.
Wedge your fingers between the 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.
Use a Philips-head screwdriver to remove 4pcs
screws for unlocking mechanisms.
(No.1~4 screw size=M6x12; Torque=9±0.5kgfxcm)
23
41
1
2
3
4
Lift the rear cover up carefully. Disconnect the USB
LVDS cable and function key cable from the
connectors of the interface board, and then remove
the rear cover.
Use a Philips-head screwdriver to remove 1pcs
screw for unlocking the USB board unit, then release
the USB board unit and put it aside.
(No.1 screw size=M3x6, Torque=4±0.5kgfxcm)
1
2
6
7
8
53
4
1
Use a Philips-head screwdriver to remove 8pcs
screws for unlocking the speakers with middle bezel.
Release the speakers’ cables from the hooks of the
middle bezel, and then disconnect the speaker cable
away from the connector of the circuit board.
(No.1~8 screw size=M3x8, Torque=5±0.5kgfxcm)
Necessary repair and test equipment:
1. Philips-head screwdriver

4. Disassembly and Assembly Procedures
S9
S8
S10
S11
S7
U
U
se a Philips-head screwdriver to remove 2pcs
screws for unlocking the heat-sink. se a Philips-
head screwdriver to remove 26pcs screws for
unlocking the middle bezel, then remove the bezel.
(No.1~28 Screw size= M3x0.5x4, Torque=5±0.5kgfxcm)
1
2
78
9
13
14
15
34 5 6
10
11
12
21
20 19 18 17 16
22
23
24
25
26
28
27
Put the rear cover with function key board into a Jip.
Tear off the mylar tape on the function key board,
then use a Philips-head screwdriver to tighten 3pcs
screws for locking the function key board with the
front bezel.
(No.1~3 Screw size= M2x2.4, Torque=0.8±0.2kgfxcm)
Tear off acetate tape, then disconnect the panel lamp
cables from the connectors of the circuit board.
U
.
se a Philips-head screwdriver to remove 4pcs screws
for locking the bracket chassis module with the panel
(No.1~4 Screw size= M6x12, Torque=9±0.5kgfxcm)
Lift up the bracket chassis, and disconnect the LVDS
cable from the connector of the T-CON board, then
put the bracket chassis on a protective cushion.
23
4
1
Use a Philips-head screwdriver to remove 2pcs
screws for unlocking the small bracket with T-Con
board, then remove the small bracket.
(No.1~2 Screw size= M3x0.5x4, Torque=3~5kgfxcm)
2
1
S12
1
2
3

4. Disassembly and Assembly Procedures
S15
S14
S13
Remove 2pcs shading tape on the left and right side
of the panel corner, then remove 32pcs acetate
tapes on the specific positions of the back of panel.
Use a Philips-head screwdriver to remove
screws for unlocking power board and interface
board.
9pcs
(No.1 screw size=M4x8, Torque=6±0.5kgfxcm;
No.2~9 screw size=M3x7.5, Torque=6±0.5kgfxcm)
Remove the circuit boards from the
disconnect all
of the cables.
bracket
chassis module carefully, and then
Turn over the bracket chassis module. Remove the
Mylar from the hooks of the bracket, and then use a
Philips-head screwdriver to remove screws for
unlocking AC power outlet.
two
(No.1~2 screw size=M3x10, Torque=6±0.5kgfxcm)
S16
21
79
6
8
13
452

4. Disassembly and Assembly Procedures
4.2 Assembly Procedures:
Put 1pcs power board into the bracket, then use a
Philips-head screwdriver to tighten 5pcs screws for
locking the power board.
(No.1 screw size=M4x8, Torque=6±0.5kgfxcm;
No.2~5 screw size=M3x7.5, Torque=6±0.5kgfxcm)
Place a bracket chassis base on a protective
cushion, then stick 3pcs Silicon sheets on the
position as the picture below shown.
S2
S1
Use a two screws
for locking the AC-power outlet connector.
Philips-head screwdriver to tighten
(No.1~2 screw size=M3x8, Torque=6~8kgfxcm)
S4
Take 1pcs interface board, connect a LVDS cable to
the connector of the interface board, then connect
the power connective cable to the the interface
board. Turn over the interface board and locate it into
the bracket. Use a Philips-head screwdriver to tighten
4pcs screws for locking the interface board.
(No.6~9 screw size=M3x7.5, Torque=6±0.5kgfxcm)
S3
79
21
Panel preparation: Take out 1pcs panel module from
the carton, remove the protective film by tearing off
all the tapes of screen and four sides, then examine
the panel surface according to inspection criteria
carefully.
S5
2
4
13
5
6
8
Take 1pcs Dell nameplate, then use a locating fixture
to fix the nameplate to the front bezel of the module,
and then move the whole unit into a laminating
fixture, use the laminating fixture to press the
nameplate with the front bezel of the panel module
firmly attachment.
S6

4. Disassembly and Assembly Procedures
Plug 2pcs panel lamp cables to the connectors of
the circuit board, then fix the cables with tapes
pasted on the panel module.
Take 1pcs function key board and 1pcs middle bezel,
and then locate the function board into the specific
position of the middle bezel. Put the unit into a fixture,
use
Paste 1pcs mylar tape to cover the
function key board.
a Philips-head screwdriver to tighten 3pcs
screws for locking the function key board with the
middle bezel.
(No.1~3 Screw size= M2x2.4, Torque=0.8±0.2kgfxcm)
Adjust the bracket chassis module, and then u
.
se a
Philips-head screwdriver to tighten 4pcs screws for
locking the bracket chassis module with the panel
(No.1~4 Screw size= M6x12, Torque=9±0.5kgfxcm)
23
4
1
Take 1pcs small bracket to assemble with T-Con
board, then use a Philips-head screwdriver to tighten
2pcs screws for locking the small bracket with T-Con
board.
(No.1~2 Screw size= M3x0.5x4, Torque=3~5kgfxcm)
S8
Move the bracket chassis module close to the panel
module, then connect the LVDS cable to the
connector of the T-Con board, then put the bracket
on the back of the panel module.
2
1
S9
S10
S11
S12
1
2
3
Turn over the panel module to place screen faced
down. Paste 2pcs shading tape on the left and right
side of the panel corner, then paste 32pcs acetate
tapes on the specific position of the back of panel as
the picture below shown.
S7

4. Disassembly and Assembly Procedures
S15
Take a pair of speakers to locate the probers of the
middle bezel, then locate the speakers’ cable to the
hooks of the middle bezel, and then connect the
speaker cable to the connector of the circuit board.
Use a Philips-head screwdriver to tighten 8pcs
screws for locking the speakers with middle bezel.
(No.1~8 screw size=M3x8, Torque=5±0.5kgfxcm)
S14
Move the assembled rear cover close to the
panel unit, then connect the USB LVDS cable and
function key cable to the connectors 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.
1
S16
2
6
7
8
53
4
1
Take 1pcs USB board, 1pcs conductive foam, 1pcs
LVDS cable and 1pcs rear cover. Connect the LVDS
cable to the connector of the USB board, then paste
1pcs conductive foam on the back of the USB board,
and then locate the USB board into the correct
position of the rear cover. Use a Philips-head
screwdriver to tighten 1pcs screw for locking the
USB unit with the rear cover.
(No.1 screw size=M3x6, Torque=4±0.5kgfxcm)
Assemble the middle
the unit, then settle and paste the function key cable
with tapes as the picture below shown. U
U
bezel with function key board to
se a Philips-
head screwdriver to tighten 26pcs screws for locking
the middle bezel with the panel module. se a
Philips-head screwdriver to lock 2pcs screws for
locking the heat-sink.
(No.1~28 Screw size= M3x0.5x4, Torque=5±0.5kgfxcm)
S13
1
2
78
9
13
14
15
34 5 6
10
11
12
21
20 19 18 17 16
22
23
24
25
26
28
27

Take a stand base close to the monitor. Fit the two
tabs on the upper part of the stand into the grooves
on the back of the monitor, and then lower the stand
so that the monitor mounting area snaps onto the
stand.
Use a protective bag to pack the stand base, then lift
up the monitor to checking the gap between the front
bezel with panel module , then provide power supply
and a video signal to the monitor , then turn on the
monitor for functionality check.
S18
S19
Use a Philips-head screwdriver to tighten four
screws for locking mechanisms. Stick 1pcs label on
the specific positions as the picture below shown.
(No.1~4 screw size=M6x12; Torque=9±0.5kgfxcm)
S17
23
41
4. Disassembly and Assembly Procedures

5. Trouble Shooting 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:
1Turn o both your computer and the monitor.
2Unplug 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.
3Turn on the monitor.
The floating 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.
Dell UltraSharp 43 Monitor
The display will go into Standby Mode in 4 minutes.
No HDMI Cable
www.dell.com/support/U4320Q
U4320Q
or
Dell UltraSharp 43 Monitor
The display will go into Standby Mode in 4 minutes.
No DP Cable
www.dell.com/support/U4320Q
U4320Q
or
Dell UltraSharp 43 Monitor
The display will go into Standby Mode in 4 minutes.
No USB Type-C Cable
www.dell.com/support/U4320Q
U4320Q
4This box also appears during normal system operation if the video cable becomes
disconnected or damaged.
5Turn 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.

5. 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.
NOTE: You can run the built-in diagnostics only when the video cable is unplugged
and the monitor is in self-test mode.
3 4 51 2
To run the built-in diagnostics:
1Make sure that the screen is clean (no dust particles on the surface of the screen).
2Unplug the video cable(s) from the back of the computer or monitor. The monitor
then goes into the self-test mode.
3Press and hold Button 4 for 4 seconds. System will pop OSD message, select
and press , then system enter BID mode. A gray screen appears.
4Carefully inspect the screen for abnormalities.
5Press Button 1 on the front panel again. The color of the screen changes to red.
6Inspect the display for any abnormalities.
7Repeat steps 5 and 6 to inspect the display in green, blue, black, white, and text
screens.
The test is complete when the text screen appears. To exit, press Button 1 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.
Setting USB-C Prioritization when USB-C Charging is
set to On During Power Off
If USB-C Charging is set to On During Power Off, the monitor allows you to specify the
USB-C Prioritization settings only when your PC is powered off.
1Ensure that your PC is powered off.
2Press any control button other than the power button to display the shortcut menu
of Input Source.
3Use the or button to highlight USB Type-C.
Dell UltraSharp 43 Monitor
Input Source: Auto
USB Type-C
DP
HDMI

5. Trouble Shooting Instructions
4Press and hold the button for approximately 8 seconds.
5The USB-C Prioritization configuration message will appear.
Dell UltraSharp 43 Monitor
Select USB-C Prioritization:
High Resolution
U4320Q
High Data Speed
6Use the or button to specify the preferred transfer priority.
7The setting will be effective after you turn on the PC.
PIP/PBP Mode
If your monitor does not display full screen or the resolution is not of the native resolution of
the PIP/PBP mode, it could be due to the graphic card’s behavior. Please follow the steps
below.
1Right Click in desktop and Select Display settings.
2Select Advanced display settings.

5. Trouble Shooting Instructions
3Select the recommended resolution per the graphic card, and then click Apply.
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 off
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.
No video
at HDMI/
DisplayPort/USB
Type-C port
When connected
to some dongle/
docking device
at the port,
there is no video
when unpluging/
pluging the
Thunderbolt
cable from the
notebook
• Unplug the HDMI/DisplayPort/USB Type C cable
from dongle/docking device, then plug the docking
Thunderbolt cable to the notebook. Plug the HDMI/
DisplayPort/USB Type-C cable 7 seconds later.
Missing Pixels LCD screen has
spots
• Cycle power on-off.
• Pixel that is permanently off 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:
www.dell.com/support/monitors.

5. Trouble Shooting Instructions
Common What You Possible Solutions
Symptoms Experience
Intermittent
Problems
Monitor
malfunctions on
& off
• 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.
Product Specific Problems
Problem What you
experience
Possible solutions
Screen image is
too small
Image is
centered on
screen, but does
not fill entire
viewing area
• Check the Aspect Ratio setting in the Display
menu OSD.
• Reset the monitor to factory settings.
Stuck-on Pixels LCD screen has
bright spots
• Cycle power On-Off.
• Pixel that is permanently off is a natural defect
that can occur in LCD technology.
• For more information on Dell Monitor Quality
and PixelPolicy, see Dell Support site at:
www.dell.com/support/monitors.
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.

5. Trouble Shooting Instructions
Problem What you Possible solutions
experience
Cannot adjust OSD does not • Turn o the monitor, unplug the monitor power
the monitor with appear on the cable, plug it back, and then turn on the monitor.
the buttons on screen
the front panel
No Input Signal
when user
controls are
pressed
No picture, the
LED light is white
• Check the signal source. Ensure the computer is
not in the power saving mode by moving the mouse
or pressing any key on the keyboard.
• Check whether the signal cable is plugged in
properly. Connect the signal cable again, if
necessary.
• Reset the computer or video player.
The picture does
not fill the entire
screen
The picture
cannot fill the
height or width
of the screen
• Due to dierent video formats (aspect ratio) of
DVDs, the monitor may display in full screen.
• Run the built-in diagnostics.
No image
when using
USB Type-C
connection
to computer,
laptop, and so on
Black screen • Verify if the USB Type-C interface of the device can
support DP alternate mode.
• Verify if the device required more than 65 W power
charging.
• USB Type-C interface of device cannot support DP
alternate mode.
• Set Windows to Projection mode.
• Ensure that the USB Type-C cable is not damaged.
No charging
when using
USB Type-C
connection
to computer,
laptop, and so on
No charging • Verify if the device can support one of 5 V/9 V/15
V/20 V charging proles.
• Verify if the Notebook requires a >65 W power
adaptor.
• If the Notebook requires a >65 W power adaptor, it
may not charge with the USB Type-C connection.
• Ensure that you use only Dell approved adapter or
the adapter that comes with the product.
• Ensure that the USB Type-C cable is not damaged.
Intermittent
charging
when using
USB Type-C
connection to
computer,
laptop, and so on
Intermittent
charging
• Check if the maximum power consumption of
device is over 65 W.
• Ensure that you use only Dell approved adapter or
the adapter that comes with the product.
• Ensure that the USB Type-C cable is not damaged.
No image
when using DP
connection to
the PC
Black screen • Verify which DP standard (DP 1.1a or DP 1.4) is your
Graphics Card certied to. Download and install the
latest graphics card driver.
• Some DP 1.1a graphics card cannot support
DP 1.4 monitors. Go to OSD menu, under Input
Source selection, press and hold DP select
key for 8 sec to change the monitor setting from
DP 1.4 to DP 1.1a.