DELL-U3425WE UltraSharp Computer Monitor User Guide

Service Manual–U3425WEB
Version: 01
Date:2023/11/09

General Safety Instructions

Use the following safety guidelines to help ensure your own personal safety and to help protect your equipment and working environment from potential damage.
NOTE: In this section, equipment refers to monitors.
IMPORTANT NOTICE FOR USE IN HEALTHCARE ENVIRONMENTS:
Dell products are not medical devices and are not listed under UL or IEC 60601 (or equivalent). As a result, they must not be used within 6 feet of a patient or in a manner that directly or indirectly contacts a patient
1.1 SAFETY: General Safety
WARNING: To prevent the spread of fire, keep candles or other open flames away from this product at all times.
When setting up the equipment for use:

• Place the equipment on a hard, level surface. Leave 10.2 cm (4 in) minimum of clearance on all vented sides of the computer to permit the airflow required for proper ventilation.
• Restricting airflow can damage the computer or cause a fire.
• Do not stack equipment or place equipment so close together that it is subject to recalculated or preheated air.
• NOTE: Review the weight limits referenced in your computer documentation before placing a monitor or other devices on top of your computer.
• Ensure that nothing rests on your equipment’s cables and that the cables are not located where they can be stepped on or tripped over.
• Ensure that all cables are connected to the appropriate connectors. Some connectors have a similar appearance and may be easily confused (for example, do not plug a telephone cable into the network connector).
• Do not place your equipment in a closed-in wall unit or on a bed, sofa, or rug.
• Keep your device away from radiators and heat sources.
• Keep your equipment away from extremely hot or cold temperatures to ensure that it is used within the specified operating range.
• Do not push any objects into the air vents or openings of your equipment. Doing so can cause fire or electric shock by shorting out interior components.
• Avoid placing loose papers underneath your device. Do not place your device in a closed-in wall unit, or on a soft, fabric surface such as a bed, sofa, carpet, or a rug.

When operating your equipment:

• Do not use your equipment in a wet environment, for example, near a bath tub, sink, or swimming pool or in a wet basement.
• Do not use AC powered equipment during an electrical storm. Battery powered devices may be used if all cables have been disconnected.
• Do not spill food or liquids on your equipment.
• Before you clean your equipment, disconnect it from the electrical outlet. Clean your device with a soft cloth dampened with water. Do not use liquids or aerosol cleaners, which may contain flammable substances.
• Clean the monitor display with a soft, clean cloth and water. Apply the water to the cloth, then stroke the cloth across the display in one direction, moving from the top of the display to the bottom. Remove moisture from the display quickly and keep the display dry.
• Long-term exposure to moisture can damage the display. Do not use a commercial window cleaner to clean your display.
• If your equipment does not operate normally – in particular, if there are any unusual sounds or smells coming from it – unplug it immediately and contact an authorized dealer or service center.

Protecting Against Electrostatic Discharge
Electrostatic discharge (ESD) events can harm electronic components inside your equipment. Under certain conditions, ESD may build up on your body or an object, such as a peripheral, and then discharge into another object, such as your computer. To prevent ESD damage, you should discharge static electricity from your body before you interact with any of your equipment’s internal electronic components, such as a memory module. You can protect against ESD by touching a metal grounded object (such as an unpainted metal surface on your computer’s I/O panel) before you interact with anything electronic. When connecting a peripheral (including handheld digital assistants) to your equipment, you should always ground both yourself and the peripheral before connecting it. In addition, as you work inside the equipment, periodically discharge any static charge your body may have accumulated.

You can also take the following steps to prevent damage from electrostatic discharge:

• When unpacking a static-sensitive component from its shipping carton, do not remove the component from the antistatic packing material until you are ready to install the component. Just before un wrapping the antistatic package, be sure to discharge static electricity from your body.
• When transporting a sensitive component, first place it in an antistatic container or packaging.
• Handle all electrostatic sensitive components in a static-safe area. If possible, use antistatic floor pads and work bench pads.

1.2 SAFETY: General Power Safety

Observe the following guidelines when connecting your equipment to a power source:

• Check the voltage rating before you connect the equipment to an electrical outlet to ensure that the required voltage and frequency match the available power source.
• Do not plug the equipment power cables into an electrical outlet if the power cable is damaged
• Norway and Sweden: If this product is provided with a 3-prong power cable, connect the power cable to a grounded electrical outlet only.
• If you use an extension power cable, ensure that the total ampere rating of the products plugged in to the extension power cable does not exceed the ampere rating of the extension cable.
• If you must use an extension cable or power strip, ensure the extension cable or power strip is connected to a wall power outlet and not to another extension cable or power strip. The extension cable or power strip must be designed for grounded plugs and plugged into a grounded wall outlet.
• If you are using a multiple-outlet power strip, use caution when plugging the power cable into the power strip. Some power strips may allow you to insert a plug incorrectly. Incorrect insertion of the power plug could result in permanent damage to your equipment, as well as risk of electric shock and/or fire. Ensure that the ground prong of the power plug is inserted into the mating ground contact of the power strip.
• Be sure to grasp the plug, not the cable, when disconnecting equipment from an electric socket.

If your equipment uses an AC adapter:

• Use only the Dell provided AC adapter approved for use with this device. Use of another AC adapter may cause a fire or explosion.
• NOTE: Refer to your system rating label for information on the proper adapter model approved for use with your device.
• Place the AC adapter in a ventilated area, such as a desk top or on the floor, when you use it to run the computer or to charge the battery. Do not cover the AC adapter with papers or other items that will reduce cooling; also, do not use the AC adapter inside  a carrying case.
• The AC adapter may become hot during normal operation of your computer. Use care when handling the adapter during or immediately after operation.
• It is recommended that you lay the adapter on the floor or desk so that the green light is visible. This will alert you if the adapter should accidentally go off due to external effects. If for any reason the green light goes off, disconnect the AC power cord from  the wall for a period of ten seconds, and then reconnect the power cord.
• Japan Only: Use only the Dell-provided AC power cable with the AC adapter. Use of any other power cable may damage the device or AC adapter or may present risk of fire or electric shock.

Exploded view diagram with list of items

NOTE:
For replacement of power cord, connectivity cable and external power supply (if applicable), contact Dell:

1. Go to https://www.dell.com/support.
2. Verify your country or region in the Choose A Country/Region drop-down menu at the bottom-right corner of the page.
3. Click Contact Us next to the country dropdown.
4. Select the appropriate service or support link based on your need.
5. Choose the method of contacting Dell that is convenient for you

Wiring connectivity diagram

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.

Connect/ disconnecting the DisplayPort (DisplayPort to DisplayPort) cable and Power cabler

Connecting/ disconnecting the HDMI cable and Power cable

Connecting/ disconnecting the USB-A to USB-C cable and Power cable

Connecting/ disconnecting the Thunderbolt™ 4 passive cable and Power cable

Connecting/ disconnecting the monitor for RJ45 cable (optional) and Power cable

Disassembly and Assembly Procedures

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.

5.1 Disassembly SOP
Preparation before disassemble

1. Clean the room for disassemble
2. Identify the area for monitor
3. Check the position that the monitors be placed and the quantity of the monitor; prepare the area for material flow; according to the actual condition plan the disassemble layout
4. Prepare the implement, equipment, material as bellow:

1. Working table
2. Philips-head screwdriver
3. Gloves
4. Cleaning cloth
5. ESD protection
6. Curve cushion

S1 Turn off power
S2 To remove the stand:

Place the monitor on the curve cushion in original packaging
Press and hold the stand release button at the back of the display

Lift the stand assembly up and away from the monitor

S3 Unlock 4 screws on “Rear Cover”

(Screw Torque:8-10Kgf)

S4 Use hands or Bar Scraper to disassemble “Rear Cover” from “Middle Frame”

Notice the disassembly order:
Left Side=>Top Side =>Right Side =>Bottom Side

S5 Pull out “Control board FFC” from “Interface board” to take off “Rear Cover”

S6 Tear off 2 tapes from “Rear Cover”
Tear off “Control board FFC” from “Rear Cover”

Unlock 3 screws to disassemble “Control board” from “Rear Cover”

S7 Unplug “Control board FFC” from “Control board”

Tear off “MYLAR LENS” from “Control board”

S8 Unplug “Backlight wire” from “LED Driver board” (See pink mark)
Unplug “Speaker wire” from “Interface board” (See red mark)

Tear off 4 tapes from “Speaker wire” and “Panel” (See blue Mark)
Unlock 6 screws to disassemble “Speaker” from “Middle Frame” (See yellow mark)

S9 Tear off below mylars from “Main Shielding”

a. MYLAR BL
b. MYLAR USB
c. MYLAR SPK
d. MYLAR ALS

S10 Unplug “Ambient Light Sensor FFC” from “Interface board”

Tear off “Ambient Light Sensor FFC” from “Main Shielding”
Disassemble “Sensor board” from “Middle Frame”

S11 Unplug “Ambient Light Sensor FFC” from “Sensor board”

S12 Tear off an acetate tape from “USB board wire” and “Panel”
Unplug 2 “USB board FFC” and “USB Board wire” from “Interface board”

Unlock 1 screw to disassemble “USB board” from “Middle Frame”

S13 Unplug all cables from “USB board”

S14 Disassemble a “GASKET” from “Panel”

S15 Unlock 4 screws to disassemble “Main Shielding” from “Panel”

S16 Tear off an acetate tape from “FFC EDP” and “Panel”

Tear off a yellow tape from “FFC EDP” connector

S17 Unplug “FFC EDP” from “Panel”

S18 Take off “Main Shielding” from “Panel”

S19 Unlock 19 screws to disassemble “Middle Frame” from “Panel”

S20 Disassemble 6 pieces of “Boss Panel” from “Panel”

S21 Disassemble “MYLAR Power” from “Main Shielding”

S22 Unlock 10 PCBA screws to disassemble “Interface board”, “Power board” and “LED Driver board” from “Main Shielding”

S23 Unplug wires from “Interface board”, “Power board” and “LED Driver board”

S24 Unlock 3 screws to disassemble “Thunderbolt board” from “Interface board”

Take off “Thunderbolt board” from “Interface board”

5.2 Assembly SOP
Preparation before assemble

1. Clean the room for work
2. Identify the area for material
3. Prepare the implement, equipment, material as bellow:1) Working table

1. Working table
2. Philips-head screwdriver
3. Gloves
4. Cleaning cloth
5. ESD protection
6. Curve cushion

S1 Assemble “Thunderbolt board” to “Interface board” and fix it by 3 screws

S2 Insert “Power board to Interface board wire” into “Power board”. Assemble “Power board” to “Main Shielding”

Insert “Power board wire” into “LED Driver board”. Assemble “LED Driver board” into “Main Shielding”
Insert “FFC EDP” into “Interface board” and paste an acetate tape to fix it
Insert “Power board to Interface board wire” into “Interface board”. Assemble “Interface board” to “Main Shielding”

S3 Lock 10 PCBA screws

S4 Assemble “MYLAR Power” with “Main Shielding” to cover “Power board”

S5 Place U3425WE panel on the curve cushion in original packaging
Assemble 6 pieces of “Boss Panel” to “Panel”

S6 Assemble “Middle Frame” to “Panel”

Lock 19 screws to fix “Middle Frame” with “Panel”

S7 Insert “FFC EDP” into “Panel”

S8  Adhere a yellow tape to fix “FFC EDP” connector
Adhere an acetate tape to fix “FFC EDP” on “Panel”

S9 Place “Main Shielding” on “Panel” and lock 4 screws to fix it on “Panel”

S10 Align with “Middle Frame” to assemble a “Gasket” on “Panel”

S11 Insert 2 “USB board FFC” and 1 “USB board Wire” into “USB board”

S12 Assemble “USB board” to “Middle Frame” and fix it by screw*1

Insert 2 “USB board FFC” and “USB board Wire” into “Interface board”
Paste an acetate tape to fix “USB boaWire” on “Panel”

S13 Insert “Ambient Light Sensor FFC” into “Sensor board”

S14 Assemble “Sensor board” into “Middle Frame”

Insert “Ambient Light Sensor FFC” into “Interface board”
Adhere “Ambient Light Sensor FFC” on “Main Shielding”

S15 Assemble below mylars to “Main Shielding”

a. MYLAR BL
b. MYLAR USB
c. MYLAR SPK
d. MYLAR ALS

S16 Assemble “Speaker” to “Middle Frame” and fix it by screw*6 (See yellow mark)

Insert “Speaker Wire” into “Interface board” (See red mark)
Adhere 4 tapes to fix “Speaker Wire” on “Panel” (See blue mark)
Insert “Backlight Wire” into “LED Driver Board” (See pink mark)

S17 Paste “MYLAR LENS” to “Control board”
Insert “Control board FFC” to “Control board”

S18 Assemble “Control board” to “Rear Cover” and fix it by screws*3
Adhere “Control board FFC” on “Rear Cover” and fix it by 2 tapes

S19 Insert “Control board FFC” into “Interface board”

S20 Assemble “Rear Cover” with “Middle Frame”

S21 Fix “Rear Cover” by screw *4

S22 Insert the stand base blocks fully into the stand slot
Lift the screw handle and turn the screw clockwise
After fully tightening the screw, fold the screw handle flat within the recess

S23 Attach the stand assembly to the monitor

a. Fit the two tabs on the upper part of the stand to the groove on the back of the display
b. Press the stand down till it snaps into place

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 off both your computer and the monitor.

2. Unplug the video cable from the computer.

3. Turn on the monitor.
   If the monitor cannot sense a video signal and is working correctly, the following message will appear:
   NOTE: The message may be slightly different according to the connected input signal.
   NOTE: While in self-test mode, the power LED remains white.

4. This box also appears during normal system operation. if the video cable becomes disconnected or damaged.

5. Turn off 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.

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.

To run the built-in diagnostics:

1. Ensure that the screen is clean (no dust particles on the surface of the screen).
2. Move or press the joystick to launch the Menu Launcher.
3. Move the joystick up to select and open the Main Menu.
4. Move the joystick to navigate and select Others and then Self-Diagnostic.
5. Press the joystick to initiate the built-in diagnostics. A gray screen is displayed.
6. Observe if the screen has any defects or abnormalities.
7. Toggle the joystick once again until a red screen is displayed.
8. Observe if the screen has any defects or abnormalities.
9. Repeat steps 7 and 8 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.

Common problems
The following table contains general information about common monitor problems you might encounter and the possible solutions:

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 pressed 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 using the 0SD.
• Perform monitor self-test feature check.
• Check for bent or broken pins in the video cable connector.
• Run the built-in diagnostics. For more information, see Built-in diagnostics.
• Ensure that the correct input source is selected in the Input Source menu.
Poor focus| Picture is fuzzy blurry. or ghosting| • Eliminate video extension cables.
• Reset the monitor to factory settings.
• Change the video resolution to the correct aspect ratio
Shaky/jittery video| Wavy picture or fine movement| • Reset the monitor to factory settings.
• Check environmental factors.
• Relocate the monitor and test in another room.
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/pixelguidelines.
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 Pixel Policy,  see Dell Support site at: www.dell.com/pixelguidelines.
Brightness problems| Picture too dim or too bright| • Reset the monitor to factory settings.
• Adjust brightness and contrast controls using the 0SD.
Geometric distortion| Screen not centered correctly| Reset the monitor to factory settings.
Horizontal/ vertical lines| Screen has one or more lines| • Reset the monitor to factory settings.
• Per form monitor self-test feature check and determine if these  lines are also in self-test mode.
• Check for bent or broken pins in the video cable connector.
• Run the built-in diagnostics. For more information, see Built-in diagnostics.
Synchronization problems| Screen is scrambled or appears  torn| • Reset the monitor to factory settings.
• Per form monitor self-test feature check to determine if the  scrambled screen appears in self-test mode.
• Check for bent or broken pins in the video cable connector.
Restart the computer in the safe mode.
Safety related IssueS| Visible signs of smoke or sparks| • Do not perform any troubleshooting steps.
• Contact Dell immediately.
Intermittent problems| Monitor malfunctions on and off| • Ensure that the video cable connecting the monitor to the  computer is connected properly and is secure.
• Reset the monitor to factory settings.
• Per form monitor self-test feature check to determine if the  intermittent problem occurs in self-test mode.
Missing color| Picture missing color| • Per form monitor self-test feature check.
• 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 0SD  depending on the application.
• Adjust the Gain/Offset/Hue/ Saturation values under Custom Color in the Color menu 0SD.
• Change the Input Color Format to RGB Or YCbCr/YPbPr in the  Color settings 0SD.
• Run the built-in diagnostics. For more information, see 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 off 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.
Image ghosting| Fast moving images leave a trail of  shadow images| • Change the Response Time in the Display menu OSD.
Picture quality (Refresh rate of native resolution changes from 60  Hz to 30 Hz: or color depth drops  to 18 bits)| Issues of incorrect refresh rate or missing colors| • Set USB-C Prioritization to High Resolution.
• Check the resolution settings of your graphic card.

Product specific problems

• Reset the monitor to factory settings.
Cannot adjust the monitor with the joystick| OSD does not appear on the screen| • Turn off the monitor, unplug the power cord, plug it back, and then turn  on the monitor.
• Check whether the 0SD menu is locked. If yes, move and hold the Joystick up/down/left/right for 4 seconds to unlock ( see Lock and  Locking the control buttons).
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. Re-plug the signal cable 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 different video formats (aspect ratio) of DVDs, the monitor may  display in full screen.
• Run the built-in diagnostics. For more information, see Built-in diagnostics.
No Video at HDMI/ Display Port/ Thunderbolt port| When connected to some dongle/ docking device at the port, there is no  video when unplugging/plugging the  cable from the notebook| • Unplug the HDMI/Display Port/ Thunderbolt cable from dongle/docking device, then plug the docking HDMI/ Display Port/ Thunderbolt cable to  the notebook.
No network connection| Network dropped or Intermittent| • Check to ensure USB-C Prioritization is set to High Data Speed.
• Do not turn off the display during network connection.
Ambient light detection anomaly| When Auto Brightness is on, the  detected ambient light drops significantly| • Check whether an object is obstructing the sensor area.
• Ensure a webcam is not mounted over the sensor area.
• Wipe clean any dust that may be covering the sensor area.
• Ensure the display is not pivoted and placed to another monitor side-by­ side.

Universal Serial Bus (USB) specific problems

your monitor is turned On.
• Reconnect the upstream cable to your computer.
• Reconnect the USB peripherals (downstream connector).
• Switch off and then turn on the monrtor again.
Reboot the computer.
• Some USB devices like external portable HDD require higher electric current; connect the device directly to the computer system.
Thunderbolt 4 port does not supply  power| USB peripherals can not be charged| • Check that the connected device is compliant with the Thunderbolt 4 specification. The Thunderbolt 4 upstream port (video and data) with   icon supports USB 3.2 Gen2 and 90 an output of 90 W.
• Check that you use the Thunderbolt 4 passive cable shipped with your monitor.
Super speed USB 10 Gbps (USB 3.2 Gen2) inter face is slow| Super speed USB 10 Gbps (USB 3.2 Gen2) peripherals working slowly or not  working at all| • Check that your computer is super speed USB 10 Gbps (USB 3.2 Gen2)­ compatible.
• Some computers have USS 3.2. USS 2.0, and USB 1.1 ports. Ensure that  the correct USB port is used.
• Reconnect the upstream cable to your computer.
• Reconnect the USB peripherals (downstream connector).
• Reboot the computer.
Wireless USB peripherals stop working  when a USB 3.2 device is plugged in| Wireless USB peripherals responding  slowly or only working as the distance between itself and ts receiver decreases| • Increase the distance between the USB 3.2 peripherals and the wireless USB receiver.
• Position your wireless USB receiver as close as possible to the wireless USB peripherals.
• Use a USB-extender cable to position the wireless USS receiver as far away as possible from the USB 3.2 port.

Speakers specific problems

the monitor, unplug the monitor power cord, replug it, and then turn on the monitor.
• Ensure the audio cable is connected correctly between the Audio Line Out port and the external speaker.
• Disconnect/reconnect the audio cable from the Audio line-out port and  the external speaker.
• Reset the monitor to factory settings.

Version: 01
Date:2023/11/09

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