IBM G54
Manual de Servicio

4 Disassembly and Reassembly

4-1-4 CRT Ass�y Disassembly
1. Complete all previous steps. 2. Remove the 4 side screws 2 on the top and 2 on either side of the CRT and lift the CRT Unit Bracket. 3. Unhook the Degaussing Coil Assembly and lift it off the CRT.

4. Remove the 4 corner screws and lift the CRT up and away from the Front Cover Assembly and place it on a padded surface. ! Do not lift the CRT by the neck. Caution: If you will be returning this CRT to the monitor, be sure to place the CRT face down on a protective pad.

4-2 Reassembly (CKB7227L)
With the CRT facing downward on a protective pad, use the steps that follow to reassemble the monitor.

4-2-1 Replacing the CRT
1. Loop the CRT Ground Assembly around the back of the CRT and under the 3 corner, metal ears. Position the corner with the spring last. 2. With the Front Cover Assembly lying face down on a protective pad, position the CRT so that the corner metal ears fit properly in the Front Cover Assembly. 3. Replace the 4 corner screws. 4. Replace the Degaussing Coil Assembly and secure the Coil with the plastic Degaussing Coil Holders. 5. Replace the CRT Ground Assembly. 6. Replace the Unit Bracket Assembly.

7. Replace the Degaussing Coil at CN600 on the Main PCB. 8. Replace the Anode Cap.

4-2-3 Replacing Connector CN103 on the Video PCB
1. Position the Video Shield and replace all screws. 2. Replace both side screws on the lower edge of the Video PCB Ass�y and the screw on the signal connector.

4-2-4 Replacing the CRT Socket PCB
1. Hold the CRT Socket PCB Ass�y while you lift the Cap on the CRT Socket and replace the two Focus wires, G2 wire. 2. Reconnect the CRT Socket on the CRT pins at the plug/Socket junction.

4-2-2 Replacing the Main PCB
1. Stand the monitor on its front with the screen facing downward. 2. Replace the 7 screws on the top side of the Main PCB. 3. Position the Main PCB Ass�y in the Front Cabinet and secure it on both sides with the screws between the Bottom Chassis and CRT Unit Bracket. 4. Replace the DY connector at the CN300A_7, CN400, CN401 and CN402 connectors on the Main PCB. 5. Replace the connector between CN_Tilt. on the Main PCB and the Tilt Coil. 6. Replace all easily accessible ground wires on the CRT GND Assembly and Bottom Chassis.

4-2-5 Cabinet Reassembly
1. Reconnect CN103 on the Video PCB. 2. Position the Top Shield and replace the 8 screws. 3. Replace the 4 screws on the Bottom Cover. 4. Position the Rear Cover making sure that the tabs along the front edge are properly snapped in place. Replace the 4 screws. 5. Replace the signal cable cover cap. 6. Set the monitor on its Base and make sure that the CRT faceplate was not scratched or otherwise damaged.

4-2

CKB5237L/7227L