HP- LT3200_ HP-LT3700_HP-LT4200_HP-LT4700 _ DISASSEMBLE PROCEDURE GUIDE

HP- LT3200_ HP-LT3700_HP-LT4200_HP-LT4700 _ DISASSEMBLE PROCEDURE  

 

• Carefully place the TV with the glass screen facing downward on a padded, stable table.
• Position the bottom of the TV near the edge of the table so the pedestal hangs off the edge of the table.
• Remove the four screws.

• Carefully lift the pedestal off the TV.

DISASSEMBLING THE PEDESTAL

• Position the pedestal so you can access the screws from the bottom of the pedestal.
• Remove the four screws that hold the two pieces of the pedestal together.
• Note: Hole usage varies depending on model.

• Separate the two pieces of the pedestal.

REMOVING BACK COVER

• Remove the thirteen screws as shown.
• Note: Screws 9, 10, 11, 12, and 13 are sheet metal screws. During reassembly, make sure you return these sheet metal screws to their proper location.
• Note: The 47-inch model has two extra screws (total of 15), one on each side toward the bottom of the unit.

• On all sides of the unit, press the side of the back cover inward to release it from the inner latches.
• Note: All models except for the 32-inch have small bumps on the edge of the bezel that indicate the locations where the cover is connected to the bezel. Apply pressure at these locations to loosen the cover.
• Note: Removing the cover can be difficult and may take some time.

• Carefully lift the back cover straight up off the unit.

REMOVING THE FUNCTION KEY BOARD

• Lift the function keyboard from the slot and detach the cable from the connector.

INSTALLING THE PCA INTO THE KEY BOARD

The keyboard PCA may not come installed into the keyboard. If not installed, use the following procedure to install:

• Make sure the connector on the PCA is facing outward so it fits into the slot in the keyboard, and make sure the buttons on the PCA are facing down and aligned with the buttons on the keyboard.
• One side of the keyboard has two tabs. Snap the PCA into the slot below the two tabs.
• While properly aligning the PCA so it is straight in the keyboard, press the PCA down into the slot below the tabs on the other sides of the keyboard until it snaps into place.

REMOVING THE INFRARED BOARD

• Remove the one screw securing the infrared board.
• Lift the infrared board and detach the cable from the connector.
  
  
  

On 32-inch models, to replace the IR board, plug the cable into the connector on the IR board before you replace the screws.

REMOVING THE WALL MOUNT BRACKET

• Remove the four screws and lift the wall mount brackets away from the board cover.

  

  REMOVING THE BOARD COVER

• Remove the seven screws from the board cover and remove the board cover.

1. Note: When replacing the board cover, do NOT replace the screws above the s-video connectors and the red and white RCA jacks (audio output) as indicated by the arrows in the first of the two pictures above. You will replace these screws when you replace the back cover.
2. Note: When replacing the board cover, place the edge of the cover under the slots in the main bracket, as indicated by the blue circles in the second of the two pictures above.

REMOVING THE MAIN BOARD

• Removal procedures are similar for all models.
• It is not necessary to remove the power supply to remove the main board.
• Only the main board and cable are spared; therefore, after removing the assembly from the unit, you must remove the two brackets from the board, and replace them on the new board.
• Detach all the cables connected to the main board.
• You must remove one screw to remove the LVDS cable.

                                                                                       Power jumper above.

                                                                                     Speaker IR cable above.

                                                                       VDS cable requires screw removal [above]

• Remove the six screws from the I/O bracket.

• Remove the five screws securing the main board to the main bracket.

• Remove the main board together with the I/O bracket.

• To remove the brackets from the main board:

1. Remove the collar nut from the antenna/cable in connector.
2. On the black-faced bracket that has the row of TV connectors, remove the three black machine screws located over the HDMI ports.
3. Remove the five remaining black, self-tapping screws, and then remove the bracket from the main board.
4. On the bracket with the VGA and RS-232 ports, remove the one black, self-tapping screw next to the RCA jack and four hex screws (two for each connector), and then remove the bracket from the main board.

• When attaching the new main board to the brackets:

1. Place the brackets and board on a flat surface.
2. First install the bracket with the VGA and RS-232 ports. This bracket fits on the inside of the black connector bracket.
3. When replacing the main board/bracket assembly, install the system board bracket below the rails in the TV.

REMOVING POWER SUPPLY

• LT3200 and LT3700 models use the same power supply. LT4200 and LT4700 models use the same power supply, but differ from the LT3x00 models.
• Do not have to remove the main board to remove the power supply.
• Detach all the cables connected to the power supply.

                                                                                   Inverter cables above.

                                                                                   Inverter cables [above]

• The Master inverter cable connector is closer to the outside of the board

• Remove the four screws securing the power supply to the main bracket.

• Remove the power supply.