Dell S2421H Simplified Service Manual
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Also See for S2421H:
- User manual (57 pages) ,
- User manual (56 pages) ,
- User manual (22 pages)
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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.
1. Important Safety Notice
! To ensure using a proper screwdriver, follow the
! Using Lead-Free solder to well mounted the
! The fusion point of Lead-Free solder requested in
torque and force listed in assembly and
disassembly procedures to unscrew screws.
parts.
the degree of 220°C.
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Summary of Contents for Dell S2421H
- Page 1 1. Important Safety Notice Product Announcement: ! To ensure using a proper screwdriver, follow the This product is certificated to meet RoHS torque and force listed in assembly and Directive and Lead-Free produced definition. disassembly procedures to unscrew screws. Using approved critical components only is ! Using Lead-Free solder to well mounted the recommended when the situation to replace parts.
- Page 2 2. Exploded view diagram with list of items...
- Page 3 3. Wiring Connectivity Diagram Panle 1920*1080 Interface Board Power Board FK BD HDMI HDMI Line Out...
- Page 4 4. Disassembly and Assembly Procedures Necessary repair and test equipment: 1. Philips-head screwdriver 4.1 Disassembly Procedures: Remove the monitor stand base: 1. Place the monitor on a soft cloth or cushion. 2. Press the stand down to access to the release latch. 3.
- Page 5 4. Disassembly and Assembly Procedures Use a Philips-head screwdriver to remove 16pcs screws for unlocking the middle bezel. (No.1~11 screw size=M3x4, Torque=3~4kgfxcm; No.12~16 screw size=M2x3.3, Torque=1±0.2kgfxcm) Tear off the tape, then lift up the panel module with the bracket chassis for releasing the front bezel away from the panel module.
- Page 6 4. Disassembly and Assembly Procedures Remove the interface board and power board from the bracket chassis module carefully, and disconnect all the cables. Remove the Mylar from the hooks of the bracket chassis module. Use a Philips-head screwdriver to remove six screws for unlocking the circuit board, release all the cables from the hooks.
- Page 7 4. Disassembly and Assembly Procedures 4.2 Assembly Procedures: Take a mylar to insert the hooks of the bracket to Place a bracket chassis base on a protective cover the power board. cushion. Panel preparation: Take out 1pcs panel module from the carton, then remove the protective film by tearing Turn over a power board and put the power board off the tapes, and then examine the panel surface...
- Page 8 4. Disassembly and Assembly Procedures Paste 1pcs tape to cover the LVDS connector. Take Use a Philips-head screwdriver to tighten 2pcs 1pcs front bezel, then lift up the panel with bracket screws for locking the bracket with middle bezel, to and assemble the front bezel with the panel module.
- Page 9 4. Disassembly and Assembly Procedures Use a Philips-head screwdriver to tighten 4pcs Take a pair of speakers to locate the probers of the middle bezel, then connect the speaker cable to the screws for locking rear cover with the assembled unit, to tighten 2pcs screws for locking the rear connector of the board.
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Page 10: Troubleshooting Instructions
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. Dell 24/27 Monitor No HDMI1 Cable The display will go into Standby mode in 4 minutes. -
Page 11: Built-In Diagnostics
5. Trouble Shooting Instructions 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: Ensure that the screen is clean (no dust particles on the surface of the screen). -
Page 12: Common Problems
• Cycle power on-off. spots • 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/monitors. Stuck-on pixels LCD screen has •... - Page 13 5. Trouble Shooting Instructions Common What you Possible solutions symptoms experience Intermittent Monitor • Ensure that the video cable connecting the problems malfunctions on monitor to the computer is connected properly & off and is secure. • Reset the monitor to factory settings. •...
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Page 14: Product Specific Problems
5. Trouble Shooting Instructions Product specific problems Problem What you Possible solutions experience Screen image is Image is centered • Check the Aspect Ratio setting in the too small on screen, but Display menu OSD. does not fill entire • Reset the monitor to factory settings. viewing area Cannot adjust OSD does not...