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  4. Disassembly and Assembly Procedures

 

4

.2  Assembly Procedures:

Turn over a power board and put the power board 

into the bracket chassis. 

Place a bracket chassis base on a protective 

cushion, then stick 1pcs Silicon sheet on the position 

as the picture below shown.

S2

S1

S4

Take a interface board, connect 2pcs LVDS cable to 

the connectors 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, then locate all the cables 

into the correct position of the bracket. Use a Philips-

head screwdriver to tighten 7pcs screws for locking 

the circuit board, .

(No.1 screw size=M4x8, Torque=7

±1

kgfxcm; 

 No.2~7 screw size=M3x7.5, Torque=7

±1

kgfxcm)

S3

Panel preparation: Take a panel and then examine 

the panel surface according to inspection criteria. 

Tear off the protective film of the panel screen, and 

then turn over the panel to place screen faced down. 

S6

S5

Take a mylar to insert the hooks of the bracket to 

cover the power board as the following picture shown. 

2

5

3

1

7

6

4

Put down the bracket chassis module on the back of 

panel module, then connect the two LVDS cables to 

the connectors of the panel module.

Use a 

 4pcs 

screws for locking the bracket with panel module. 

Philips-head screwdriver to tighten

(No.1~4 screw size=M3x4, Torque=5

±0.5

kgfxcm)

S7

3

2

1

4

Summary of Contents for P3221D

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 In Power BD Panel USB3 0 Down4 LED BD FK key BD HDMI 1 4 In DP 1 2 In Type C USB 2 0 Down 1 USB 2 0 Down 2 USB3 0 Down3 Interface BD USB BD ...

Page 4: ... pull up carefully the rear cover in order of arrow preference for unlocking mechanisms of rear cover 3 2 1 2 Lift the rear cover up carefully Disconnect the joystick key cable from the connector of the interface board and then remove the rear cover and put it aside for later diasassembling Use a Philips head screwdriver to remove 2pcs screw for unlocking the key board then tear off the tapes and ...

Page 5: ...num No 1 14 screw size M3x5 Torque 5 0 5kgfxcm 3 14 2 1 4 5 6 7 8 9 10 11 12 13 Take away the middle bezel U tear off the tape for releasing the LED cable se a Philips head screwdriver to remove 1pcs screw for unlocking the LED board with the middle bezel and then No 1 3 screw size M2x2 4 Torque 0 8 0 2kgfxcm 2 Lift up the panel with the bracket chassis for releasing the front bezel away from the ...

Page 6: ...rque 7 1kgfxcm No 2 7 screw size M3x7 5 Torque 7 1kgfxcm Remove the power board board and interface board from the disconnect all of the cables bracket chassis module carefully and then Remove the Mylar tape from the hooks of the bracket 2 5 3 1 7 6 4 Take away the bracket chassis module and then put the bracket chassis module on a protective cushion S15 S16 ...

Page 7: ...a Philips head screwdriver to tighten 7pcs screws for locking the circuit board No 1 screw size M4x8 Torque 7 1kgfxcm No 2 7 screw size M3x7 5 Torque 7 1kgfxcm S3 Panel preparation Take a panel and then examine the panel surface according to inspection criteria Tear off the protective film of the panel screen and then turn over the panel to place screen faced down S6 S5 Take a mylar to insert the ...

Page 8: ...dule S8 S9 Take 1pcs front bezel then lift up the panel with bracket and assemble the front bezel with the panel module 2 Move the middle bezel with the LED board close to the panel unit then assemble the middle bezel with the front bezel and panel module Tear off the papers of the tapes on the back of the LED cable and then fix the LED cable on the panel with 2pcs tapes then connect the LED cable...

Page 9: ... cover and push the rear cover on the positions marked as the picture below shown for mechanisms engagement S18 Paste 1pcs aluminum foil to cover the two LVDS connectors then use a Philips head screwdriver to tighten 4pcs screws for locking the middle bezel with front bezel No 1 4 screw size M2x3 5 Torque 2 5 0 5kgfxcm S14 Paste 1pcs conductive tape to cover the panel lamp connectors as the pictur...

Page 10: ...the monitor to check the gap between the front bezel and the panel then provide power supply and a video signal to the monitor then turn on the monitor for functionality check S20 S21 Use a Philips head screwdriver to tighten 4pcs screws for locking the rear cover with the assembled unit Stick 2pcs labels on the specific positions of the rear cover as the picture below shown No 1 4 screw size M4x1...

Page 11: ...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 No HDMI Cable The display will go into Standby mode in 4 minutes www dell com P3221D or No DP Cable The display will go into Standby mode in 4 minutes www dell com P3221D or No USB C Cable The d...

Page 12: ...four seconds until a menu appears on the screen 3 Using the joystick control highlight the Diagnostics option and press the joystick button to start the diagnostics A gray screen is displayed 4 Observe if the screen has any defects or abnormalities 5 Toggle the joystick once again until a red screen is displayed 6 Observe if the screen has any defects or abnormalities 7 Repeat steps 5 and 6 until ...

Page 13: ... 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 www dell com support m...

Page 14: ...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 15: ...s 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...

Page 16: ... is not damaged Intermittent charging when using USB Type C connection to computer laptop and so on Intermittent charging Check if the maximum power consumption of device is over 65 W Ensure that you use only Dell approved adapter or the adapter that comes with the product Ensure that the USB Type C cable is not damaged No image when using DP connection to the PC Black screen Verify which DP stand...

Page 17: ...hat your computer is USB 3 2 Gen1 capable Some computers have USB 3 2 Gen1 USB 2 0 and USB 1 1 ports Ensure that the correct USB port is used Reconnect the upstream cable to your computer Reconnect the USB peripherals downstream connector Reboot the computer Wireless USB peripherals stop working when a USB 3 2 Gen1 device is plugged in Wireless USB peripherals responding slowly or only working as ...

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