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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.

  1. Important Safety Notice

Summary of Contents for S2421H

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 Panle 1920 1080 Power Board HDMI HDMI Line Out FK BD KB1 speaker Interface Board ...

Page 4: ...ver To remove the VESA cover Press the dimple on the VESA cover to release it from the back of the display Use a Philips head screwdriver to remove 6pcs 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 Tear off 2pcs acetate tapes and then disconnect the speaker cable away from the connector Use a Philips head sc...

Page 5: ...the panel module Use a Philips head screwdriver to remove 2pcs screws for unlocking the bracket with middle bezel to remove 2pcs screws for unlocking the bracket with the panel module No 1 2 screw size M3x4 Torque 3 4kgfxcm No 3 4 screw size M3x3 5 Torque 2 3kgfxcm 2 1 4 3 S9 3 1 2 Use a Philips head screwdriver to remove 16pcs screws for unlocking the middle bezel No 1 11 screw size M3x4 Torque 3...

Page 6: ...y and disconnect all the cables Use a Philips head screwdriver to remove six screws for unlocking the circuit board release all the cables from the hooks No 1 5 screw size M3x7 5 Torque 6 0 5kgfxcm No 6 screw size M4x8 Torque 6 0 5kgfxcm S15 S16 Remove the Mylar from the hooks of the bracket chassis module S14 3 4 6 2 5 1 ...

Page 7: ...of the bracket 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 six screws for locking th...

Page 8: ...dle bezel with function key board close to the panel unit tear off the papers of the tapes on the back of the key cable and then fix the key cable on the bezel by 3pcs tapes then assemble the middle bezel with the front bezel and panel module S14 3 1 2 Connect the function key cable to the connector of board then paste 1pcs aluminum foil to cover the LVDS connector and key cable S11 S12 S10 S9 Pas...

Page 9: ...n the specific position S15 S18 Use a Philips head screwdriver to tighten 6pcs screws for locking the speakers with middle bezel Settle the cable and then fix the speaker s cables with 2pcs acetate tapes on the specific position as the picture below shown No 1 6 screw size M3x8 Torque 5 6kgfxcm S16 2 3 4 1 L front bezel with panel module then provide power supply and a video signal to the monitor ...

Page 10: ...nd 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 The display will go into Standby mode in 4 minutes www dell com S2421H www dell com S2721H Dell 24 27 Monitor S2421H S2721H No HDMI1 Cable or The display will go into Standby mode in 4 minutes www dell com S242...

Page 11: ...econds a menu appears on the screen 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 wh...

Page 12: ...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 support m...

Page 13: ...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 sta...

Page 14: ...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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