Removal and Replacement 6-15 LCD Backlight PCB Removal and Replacement
Model MS20xxB MM PN: 10580-00303 Rev. D 6-35
6-15 LCD Backlight PCB Removal and Replacement
This procedure provides instructions for removing and replacing the VNA Master LCD backlight PCB.
Parts:
• 3-68567-3 – LCD Backlight Inverter PCB Assembly
Procedure:
1. Open the case as described in Section 6-6 “Opening the Instrument Case” on page 6-14.
2. Remove the Main PCB assembly from the front panel as described in Section 6-7 “PCB Assembly
Replacement (MS202xB and MS203xB)”.
3. Perform Step 1 through Step 4 of Section 6-14 “LCD Assembly Replacement”.
4. Disconnect the LCD backlight cable from the LCD backlight PCB.
5. Use a Phillips screw driver to remove the two screws securing the LCD backlight PCB to the Main PCB
assembly (Figure 6-26).
6. Carefully remove the LCD Backlight PCB.
Installing the LCD Backlight PCB:
7. Installation is the reverse of removal. Follow replacement instructions for each of the parts and
assemblies that were removed, as appropriate.
8. Close the case as described in Section “Case Reassembly:” on page 6-16.
Figure 6-26. Replacing the LCD PCB
Note
Pay attention to the routing of the LCD Backlight Cable. The cable must be positioned so that it is not
pinched when the unit is reassembled.
Remove 2 screws to replace LCD PCB
LCD Backlight
Cable
Ribbon Cable
Connects to
Keypad PCB
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