Dell P3223QE Service Manual

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

To change power cable/ connectivity cable, switch off power before unplugging the cable and replugging in required 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.

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) #1
• Screwdriver(Phillip head) #2
• Penknife
• Soldering iron and absorber

Disassembly Procedures

1. 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.
2. Use a Philips-head screwdriver to remove four screws for unlocking mechanisms.
   (No.1~4 screw size=M4x11; Torque=11±1kgfxcm)
   
3. 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.
   
4. Lift the rear cover up carefully. Disconnect the joystick key cable from the connector of the interface board, and then remove the rear cover and put it aside for later disassembling.
   
5. Use a Philips-head screwdriver to remove 2pcs screw for unlocking the key board, then tear off the tapes and release the key board.
   (No.1~2 screw size=M2x2.4, Torque=0.8~1kgfxcm)
   
6. Tear off 4pcs aluminum foil and 1pcs acetate tape as the picture below shown.
   
7. Use a Philips-head screwdriver to remove one screw for unlocking the USB board, then disconnect the USB FFC cable and remove away the USB board.
   (No.1 screw size=M3x4.5, Torque=4 ± 0.5kgfxcm)
   
8. Use a Philips-head screwdriver to remove 15(13+2)pcs screws for unlocking the middle bezel.
   (No.1~13 screw size=M3x5, Torque=5±0.5kgfxcm
   No.14~15 screw size=M2x3.3, Torque=0.8~ 1.2 kgfxcm)
   
9. Disconnect the panel lamp from the connectors of the panel and interface board and then put it aside. Disconnect the LED cable from the connector of the interface board, then release the LED cable by tearing off the 2pcs tapes.
   
10. Take away the middle bezel, and put it on a fixture, then tear off the mylar tape for releasing the LED board.
    
11. Use a Philips-head screwdriver to remove 4pcs screws for unlocking the bracket with panel module.
    (No.1~4 screw size=M3x4, Torque=5 ±0.5 kgfxcm)
    
12. Lift up the panel for releasing the front bezel away from the panel.
    
13. Disconnect the EDP cable away from the connectors of the panel, and then remove the bracket and put it on a cushion. Tear off the acetate tape of the panel.
    
14. Remove the Mylar tape from the hooks of the bracket.
    
15. Use a Philips-head screwdriver to remove 8pcs screws for interface board and power board.
    (No.1 screw size=M4x8, Torque=7 ±1 kgfxcm;
    No.2~8 screw size=M3x7.5, Torque=7 ±1 kgfxcm)
    
16. Remove the power board board and interface board from the bracket chassis module carefully, and then disconnect all of the cables.
    

Assembly Procedures

1. Place a bracket chassis base on a protective cushion, then stick 4pcs Silicon sheet on the position as the picture below shown.
   
2. Turn over a power board and put the power board into the bracket chassis.
   
3. Take a interface board, connect 1pcs EDP cable to the connectors of the interface board, then connect the cable of the power board to the connector of the interface board. Paste 1pcs tape on the board. Turn over the interface board and locate it into the bracket, then locate all the cables into the correct position of the bracket. Use a Philips-head screwdriver to tighten 8pcs screws for locking the circuit board.
   (No.1 screw size=M4x8, Torque=7 ±1 kgfxcm;
   No.2~8 screw size=M3x7.5, Torque=7 ±1 kgfxcm)
   
4. Take a mylar to insert the hooks of the bracket to cover the power board as the following picture shown.
   
5. Panel preparation: Take a panel and then examine the panel surface according to inspection criteria. Tear off the protective film of the panel screen, and then turn over the panel to place screen faced down. Paste 1pcs acetate tape on the specific position as the picture below shown.
   
6. Put down the bracket on the back of panel, then connect the EDP cable to the connector of the panel.
   
7. Take 1pcs front bezel, then lift up the panel and assemble the front bezel with the panel module.
   
8. Use a Philips-head screwdriver to tighten 4pcs screws for locking the bracket with panel module.
   (No.1~4 screw size=M3x4, Torque=5 ±0.5 kgfxcm)
   
9. Take 1pcs LED board and 1pcs middle bezel, then put the middle bezel into a fixture jip to fix the middle bezel. Tear off the release paper on the back of the board, and then paste the LED board on the correct position of the middle bezel, then paste 1pcs mylar tape to cover the LED board.
   
10. Assemble 1pcs middle bezel which have been assembled with LED board with front bezel and panel module.
    
11. Tear off the papers of the tapes on the back of the LED cable, and then fix the LED cable on the panel with 2pcs tapes, then connect the LED cable with the connector of the board. Take 1pcs panel lamp cable to connect the circuit board with the two connectors of the panel.
    
12. Use a Philips-head screwdriver to tighten 15(13+2)pcs screws for locking the middle bezel with the panel and front bezel.
    (No.1~13 screw size=M3x5, Torque=5±0.5kgfxcm;
    No.14~15 screw size=M2x3.3, Torque=0.8~1.2kgfxcm)
    
13. Take 1pcs USB board, 1pcs LVDS cable, 1pcs conductive foam. 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 middle bezel. Use a Philips-head screwdriver to tighten 1pcs screw for locking the USB unit with the middle bezel, then connect the cable with assemble unit.
    (No.1 screw size=M3x4.5, Torque=4 ± 0.5kgfxcm)
    
14. Paste 1pcs acetate tape to cover the USB connector. Paste 1pcs aluminum foil to cover the USB board. Paste 1pcs aluminum foil to cover EDP connector. Paste 1pcs aluminum foil to fix the cables. Paste 1pcs aluminum foil to cover the bracket as the picture below shown.
    
15. Take 1pcs joystick key and 1pcs OSD board, assemble the joystick key with the OSD board. Locate the board to the correct position of the rear cover, then use a Philips-head screwdriver to tighten 2pcs screws for locking the board with rear cover. Tear off the tape papers on the back of the cable, and then fix the key cable with tapes.
    (No.1 screw size=M2x2.4, Torque=0.9 ± 0.1kgfxcm)
    
16. Move the assembled rear cover close to the panel unit, then connect the key 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.
    
17. Use a Philips-head screwdriver to tighten 4pcs screws for locking the rear cover with the assembled unit. Stick 2pcs labels on the specific positions of the rear cover as the picture below shown.
    (No.1~4 screw size=M4x11; Torque=11 ± 1kgfxcm)
    
18. 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.
    
19. 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.
    

Trouble Shooting Instructions

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 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 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.
   
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.
NOTE: You can run the built-in diagnostics only when the video cable is unplugged and the monitor is in self-test mode.

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 the text screen appears. 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.

Important Safety Notice

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.