DELL S2721HGF Gaming Inch Curved Monitor Instruction Manual

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 inorder 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.

Exploded view diagram with list of items

Disassembly and Assembly Procedures

Necessary repair and test equipment:
1. Philips-head screwdriver
4.1 Disassembly Procedures:

S1
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.

S2
Use a Philips-head screwdriver to remove four screws for unlocking mechanisms.
(No.1~4 screw size=M4x8; Torque=10~11kgfxcm) S3
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. S4
Lift the rear cover up carefully. Disconnect the function key cable and power key cable from the connectors of the interface board, and then remove the rear cover. S5
Put the rear cover on a protective cushion. Use a Philips-head screwdriver to remove 4pcs screws for unlocking the function key board with the rear cover. Tear off the key tapes and release the function key board from the hook of the rear cover.
(No.1~4 screw size=M2x0.2, Torque=0.8±0.2kgfxcm) S6
Tear off all the adhesive tapes for releasing the panel lamp cable, then disconnect the panel cable away from the connector of the panel module. S7
Use a Philips-head screwdriver to remove 4pcs screws for locking the bracket chassis module with the panel.
(No.1~4 Screw size= M3x0.5×2.8, Torque=5~6kgfxcm)
S8
Move the bracket, and then disconnect the LVDS cable and panel lamp cable from the connectors of the panel module, then lift up the bracket and put it on a protective cushion.           S9
Use a Philips-head screwdriver to remove 6pcs screws for unlocking the middle bezel with the front bezel. Use a Philips-head screwdriver to remove 13pcs screws for unlocking the middle bezel with the panel module. tear off 2pcs tapes of the power cable.
(No.1~6 Screw size=M2x3.8,Torque=3±0.5kgfxcm; No.7~19 Screw size=M3x5, Torque=3~4kgfxcm) S10
Remove the middle bezel and put it into a fixture jip, then tear off the black PVC tape and use a Philipshead screwdriver to remove 1pcs screw for unlocking the power key board with the front bezel.
(No.1 Screw size= M2x2.4, Torque=0.8±0.2kgfxcm) S11
Lift up the panel module and pull out the front bezel for releasing the front bezel. S12
Turn over the bracket chassis module. Remove the Mylar from the hooks of the bracket.
S13
Use a Philips-head screwdriver to remove screws for unlocking circuit boards, and then release the panel lamp cable from the hook of the bracket. 6pcs
(No.1 screw size=M4x8, Torque=6±0.5kgfxcm; No.2~7 screw size=M3x7.5, Torque=6±0.5kgfxcm) S14
Remove the circuit boards from the bracket carefully, and then disconnect all of the cables. 4.2 Assembly Procedures:
S1
Place a bracket chassis base on a protective cushion, then stick 1pcs Silicon sheet on the position as the picture below shown.
S2
Take 1pcs power board, then connect 1pcs panel lamp cable to connect with the power board. Turn over the power board and put it into the bracket.
S3
Take 1pcs interface board, connect 1pcs LVDS cable and 1pcs lamp cable to the interface board(b.c), then connect the connective cable to the interface board. Turn over the interface board and locate it into the bracket. Use a Philips-head screwdriver to tighten 6pcs screws for locking the circuit board, then locate the panle lamp cable into the hook of the bracket.
(No.1 screw size=M4x8, Torque=7±0.5kgfxcm; No.2~6 screw size=M3x7.5, Torque=7±0.5kgfxcm) S4
Take 1pcs mylar to insert the hooks of the bracket to cover the power board, then locate the panel lamp cable into the hook as the picture below shown. S5
Panel preparation: Take out 1pcs panel module from the carton, then remove the protective film by tearing off the tapes, and then examine the panel surface according to inspection criteria. Turn over the panel, and then place screen faced down for later assembling. S6
Take 1pcs front bezel, lift up the panel module and then assemble the front bezel with the panel module unit. S7
Take 1pcs power key board and 1pcs middle bezel, then locate the power key board to the specific position of the middle bezel. Put the unit into a fixtureand then use a Philips-head screwdriver to tighten 1pcs screw for locking the power key board with the middle bezel. Cover the power key board with 1pcs black adhesive tape.
(No.1 Screw size= M2x2.4, Torque=0.8±0.2kgfxcm) S8
Assemble the middle bezel unit with the front bezeand panel module. S9
Fix the power key cable by tear off 2pcs tape papers on the back of the cable. Use a Philips-head screwdriver to tighten 13pcs screws for locking the middle bezel with the panel module.
(No.1~13 Screw size= M3x5, Torque=3~4kgfxcm) S10
Use a Philips-head screwdriver to tighten 6pcs screws for locking the middle bezel with front bezel.
(No.1~6 Screw size= M2x3.8, Torque=3±0.5kgfxcm)
S11
Put the bracket on the back of the panel module. Connect the LVDS cable and short panel lamp cable to the two connectors of the panel model. S12
Adjust the bracket chassis module, and then use a Philips-head screwdriver to tighten 4pcs screws for locking the bracket chassis module with the panel
(No.1~4 Screw size= M3x0.5×2.8, Torque=5~6kgfxcm) S13
Take the long panel lamp cable to connect with the connector of the panel module, then tear off the adhesive tape paper on the back of the cable and fix the lamp cable with 3pcs adhesive tapes. Cover the long lamp connector with 1pcs black PVC tape, then connect the power key cable with the board.
S14
Take 1pcs joystick key and 1pcs function key board, assemble the joystick key with the function key board, then press the joystick key to check if it work normally.
S15
Take 1pcs rear cover, put the rear cover on a cushion foam for later assembling. S16
Locate the function key board with Joystick key to the specific position of the rear cover, then use a Philipshead screwdriver to tighten 4pcs screws for locking the function key board with the rear cover. Tear off the tape papers on the back of the key cable, and then fix the key cable with tapes of the cable.
(No.1~4 screw size=M2x0.2, Torque=0.8±0.2kgfxcm)  S17
Move the assembled rear cover with function key board close to the assembled unit, then connect unction key cable to the connector of interface board. Put down the rear cover and push the rear cover for mechanisms engagement. Paste 1pcs label on the specific positions of the rear cover as the picture below shown. S18
Use a Philips-head screwdriver to tighten 4pcs screws for locking the rear cover with the assembled unit. Paste 2pcs labels on the specific positions.
(No.1~4 screw size=M4x10; Torque=9±0.5kgfxcm) S19
Take a stand 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.
S20
Take 1pcs base, assemble the base with the stand,  then use a screwdriver to tighten the detached screw clockwise for locking the stand with base.

S21
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.

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:

1. Turn off both your computer and the monitor.

2. Unplug the video cable from the back of the computer. To ensure proper SelfTest 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. To run the built-in diagnostics:

1. Ensure that the screen is clean (no dust particles on the surface of the screen).
2. Unplug the video cable(s) from the back of the computer or monitor. The monitor then goes into the self-test mode.
3. Press and hold Button 5 for 4 seconds, system will pop OSD message, select and press Button 1. A gray screen appears.
4. Carefully inspect the screen for abnormalities.
5. Move joystick (Button 1) to right. The color of the screen changes to red.
6. Inspect the display for any abnormalities.
7. Repeat 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 5 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 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-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:
https://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 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.
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 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.

Product specific problems

Display menu OSD.
• Reset the monitor to factory settings.
Cannot adjust the monitor
with the buttons on the
front panel| OSD does not appear on the screen| • Turn off the monitor, unplug the monitor power cable, plug it back, and then turn on the monitor.
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 different video formats (aspect ratio) of DVDs, the monitor may display in full screen.
• Run the built-in diagnostics.

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