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  5. Trouble Shooting Instructions

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.

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.

Summary of Contents for S2722DGM

Page 1: ...ipment 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 awa...

Page 2: ...2 Exploded view diagram with list of items ...

Page 3: ...3 Wiring Connectivity Diagram AC Input HDMI1 HDMI2 DP IN Headphone Out LED Driver Panel 2560 1440 LED Board Touch Board Joystic Board Power key Board Interface board Power board ...

Page 4: ...4 screw size M4x8 Torque 10 11kgfxcm 2 3 4 1 4 3 2 3 1 Lift the rear cover up carefully Disconnect the function key cable and LED cable from the connectors of the interface board and then remove the rear cover Put the rear cover on a protective cushion Tear off the shading tape then release the diffusion sheet from the hook of the rear cover Use a Philips head screwdriver to remove 4pcs screws for...

Page 5: ...tear off the tape for releasing the touch key board away from the middle bezel Tear off the black PVC tape and use a Philips head 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 1 Lift up the panel module and pull out the front bezel for releasing the front bezel U se a Philips head screwdriver to remove 4pcs screw...

Page 6: ... then Use a Philips head screwdriver to remove screws for unlocking power board and interface board 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 Turn over the bracket chassis module Remove the Mylar from the hooks of the bracket 3 4 2 1 5 6 ...

Page 7: ...o tighten 6pcs screws for locking the circuit board then locate the panel 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 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 pa...

Page 8: ...ddle bezel with power key board and touch key board with the front bezel and panel unit S11 S12 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 M3x0 5x2 8 Torque 5 6kgfxcm 1 S13 Fix the power key cable by tear off 2pcs tape papers on the back of the cable Use a Philips head scr...

Page 9: ... on a cushion foam for later assembling Take 1pcs diffusion sheet plug 1pcs LED cable to the connector of the diffusion sheet S16 Move the assembled rear cover with function key board close to the assembled unit then connect function key cable and LED cable to the connectors of the board Put down the rear cover and push the rear cover for mechanisms engagement Tear off the tape paper on the back o...

Page 10: ...front bezel with panel module then provide power supply and a video signal to the monitor then turn on the monitor for functionality check 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 S21 S20 2 3 4 1 Take 1pcs base assemble the base with the stand then ...

Page 11: ...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 S2722DGM The display will go into Standby Mode in 4 minutes www dell com S2722DGM No DP Cable Dell 27 Gaming Monitor or S2722DGM No HDMI 1 Cable Dell 27 Gaming Monitor 1 The display will go into Standby Mode in 4 minutes www dell com S2722DGM or S2...

Page 12: ...nitor 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 te...

Page 13: ...ia 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 Pixe...

Page 14: ... 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 Try different Preset Modes in Color settings OSD Adjust R G B value in Custom Color in Color settings OSD Change the Input Color Format to RGB or YCbCr in the Color settings OSD Run the built ...

Page 15: ...or 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 play...

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