Dell P Series, P2725HE 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.

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

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.
   

Use a Philips-head screwdriver to remove four screws for unlocking mechanisms.
(No.1~4 screw size=M4x10; Torque=10

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..

Lift the rear cover up carefully. Disconnect the key cable and USB FFC cable from the connectors of the interface board, and then remove the rear cover.

Put the rear cover into a fixture jip, then release the key cable by tearing off the tapes. Use a Philipshead screwdriver to remove 1pcs screws for unlocking the joystick key board with the rear cover.
(No.1 screw size=M2x3.3,Torque=1±0.2kgfxcm)

Tear off 2pcs aluminum foil, then use a Philips-head screwdriver to remove 1pcs screw for unlocking the USB unit, then disconnect the USB cable away from the board and release the USB board unit.
(No.1 screw size=M3x6, Torque=4±1kgfxcm)

Take a interface board, connect a 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 bracket. Use a Philips-head screwdriver to tighten 7pcs screws for locking the power board and interface board.
(No.1 screw size=M4x8, Torque=5±1kgfxcm; No.2~7 screw size=M3x6, Torque=5±1kgfxcm)

Panel preparation: Take out 1pcs panel from the carton 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 for later assembling.

Put the bracket chassis module on the back of LCD module, then push the earing-locks and connect LVDS cable and panel lamp cable to the connectors of the panel module.

Take 1pcs middle frame to assemble the panel module, then adjust the middle bezel for two parts firmly attachment.

Take 1pcs panel lamp cable to connect the panel and interface board, then locate the panel lamp cable to the hook of the middle frame and fix the lamp cable on the back of panel by the tapes on the back of the cable.

Take 1pcs IO cover to locate the hooks of the bracket chassis module as the picture below shown.

Use a Philips-head screwdriver to tighten 13pcs screws for locking the middle frame with the panel.
(No.1~13 screw size=M3x4, Torque=5±1kgfxcm)

Take 1pcs USB board and 1pcs connect cable. Connect the cable to the USB board, then locate the USB board into the hook of the middle frame. Use a Philips-head screwdriver to tighten one screw for locking the USB unit with middle frame, then connect the USB cable to the connector of interface board, then fix the cable by tape on the back of the cable. Paste 2pcs AL foil on the correct position to fix the cables.
(No.1 screw size=M3x6, Torque=4±1kgfxcm)

Take 1pcs joystick key, 1pcs joystick board and 1pcs joystick cable, then assemble the joystick key with board, and then connect the cable to the connector of the joystick board.

Locate the joystick board to the correct position of the rear cover, then use a Philips-head screwdriver to tighten 1pcs screw for locking the joystick board with rear cover, then fix the key cable with 2pcs tapes.
(No.1 screw size=M2x3.3,Torque=1±0.2kgfxcm)

Move the assembled rear cover close to the panel, 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.

Use a Philips-head screwdriver to tighten 4pcs screws for locking rear cover with the assembled unit. Paste 2pcs labels and insert 1pcs DP cap on the specific positions as the picture below shown.
(No.1~4 screw size=M4x10; Torque=10±1kgfxcm)

Take 1pcs assembled stand base, then fit the two tabs on the upper part of the stand into the grooves on the back of the monitor, and then press the stand so that the monitor mounting area snaps onto the stand.

Troubleshooting

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:

or

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, becaus e 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:

Product specific problems

*The optimal resolution for P2425HE/P2425HE WOST/P2725HE is 1920 x 1080 at 60 Hz; the optimal resolution for P2425E is 1920 x 1200 at 60 Hz.

Universal Serial Bus (USB) specific problems

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.