Lenovo ThinkPad 760CD ThinkPad 380, 385, 560, 560E, all 760, 765 and SelectADo - Page 49

5. Reconnect the failing device directly to the computer. (If another device is already connected to the computer, remove it first.) 6. Go to the "How to Run the Diagnostics" on page 54 and run the diagnostics. 7. If the advanced diagnostic device test does not find an error, suspect a problem with the port replicator of the system expansion bus. 8. Power off the computer and reconnect the port replicator. 9. Power on the computer and run the following advanced diagnostic tests: Serial port test with the wrap plug installed on the replicator Parallel port test with the wrap plug installed on the replicator FDD-2 device test on the failing device with scratch diskette 10. If diagnostic errors appear, replace the replicator or diskette drive attachment unit. If the problem remains after the replacement, replace the system board. 11. If power problems appear only when the replicator is used, replace the replicator. External Display Self-Test: If the display problem occurs only when using an external display, use the following instruction to correct the problem. Note: Before you replace a display, check that the 95XX systems support either 63XX, 85XX, or 95XX displays to see if it is connected correctly. If the screen is rolling, replace the external display. If that does not correct the problem, replace the FRUs in the following order until the problem goes away: 1. System board 2. Bus adapter (if used) If the screen is not rolling, run the display self-test as follows: 1. Power-off the computer and display. 2. Disconnect the display signal cable. 3. Power-on the display 4. Set the contrast to its maximum position. 5. Set the brightness control to the center detent position. Check for the following conditions: You should be able to vary the screen intensity by adjusting the contrast and brightness control. The screen should be white or light gray, with a black margin (test margin) on the screen. The screen is set to CRT or both by the ThinkPad Features program. ThinkPad 380, 385 (2635) 37