Dell S2721NX Скачать руководство пользователя страница 12

  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 

through 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 about Dell Monitor Quality 
  and Pixel Policy, see Dell Support site at: 
  

 https://www.dell.com/support/monitors

.

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 about Dell Monitor Quality 
   and PixelPolicy, see Dell Support site at: 
   

https://www.dell.com/support/monitors

.

Содержание S2721NX

Страница 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...

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

Страница 3: ...3 Wiring Connectivity Diagram Panle 1920 1080 Power Board HDMI HDMI Line Out FK BD KB1 Interface Board ...

Страница 4: ...screws for unlocking mechanisms No 1 4 screw size M4x11 Torque 7 8kgfxcm No 5 6 screw size M4x8 Torque 7 8kgfxcm S4 1 3 2 2 2 3 4 1 5 6 Necessary repair and test equipment 1 Philips head screwdriver Tear off 1pcs acetate tape and then disconnect the panel lamp cable away from the connector of panel Tear off 2pcs aluminum foils and then disconnect the function key cable away from the connector of t...

Страница 5: ...cket chassis for releasing the front bezel away from the panel module S9 3 1 2 Unplug the LVDS cable from the connector of the panel module by pushing the earing locks S8 S10 Take away the bracket chassis module and then put the bracket chassis module on a protective cushion Remove the Mylar from the hooks of the bracket chassis module S12 S11 Use a Philips head screwdriver to remove 5pcs screws f...

Страница 6: ...4 Disassembly and Assembly Procedures Remove the interface board and power board from the bracket chassis module carefully and disconnect all the cables S14 ...

Страница 7: ...ket chassis Place a bracket chassis base on a protective cushion 4 2 Assembly Procedures S2 S1 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 5pcs screws for locking the power bo...

Страница 8: ...s of the tapes on the back of the key cable and then fix the key cable on the bezel by 1pcs tape then assemble the middle bezel with the front bezel and panel module S14 3 1 2 S11 S12 S10 S9 Take 1pcs front bezel then lift up the panel with bracket and assemble the front bezel with the panel module S8 2 1 4 3 Connect the panel lamp cable to the connector of panel then paste 1pcs acetate tape to co...

Страница 9: ...ons marked as the picture below shown for mechanisms engagement S15 S16 2 3 4 1 L front bezel with panel module then provide power supply and a video signal to the monitor then turn on the monitor for functionality check ift up the monitor to checking the gap between the S18 Stick 2pcs labels on the specific positions as the picture below shown Take 1pcs stand riser and 1pcs stand base assemble th...

Страница 10: ...2421HN S2421NX S2721HN S2721NX The display will go into Standby Mode in 4 minutes www dell com support S2421HN www dell com support S2421NX Dell 24 Monitor S2421HN S2421NX No HDMI1 Cable or The display will go into Standby Mode in 4 minutes www dell com support S2421HN www dell com support S2421NX Dell 24 Monitor S2421HN S2421NX No HDMI2 Cable The display will go into Standby Mode in 4 minutes www...

Страница 11: ...een 3 Select the built in diagnostics option A gray screen appears 4 Carefully inspect the screen for abnormalities 5 Press Button 1 on the front panel again The color of the screen changes to red 6 Inspect the display for any abnormalities 7 Repeat steps 5 to 6 to inspect the display when it changes to green blue black white and text screens The test is complete when the text screen appears To ex...

Страница 12: ...e or no brightness Increase brightness and contrast controls through 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 LC...

Страница 13: ... 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 me...

Страница 14: ... 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 that 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 p...

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