Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
Display is blank and the Suspend icon is flashing.
Internal display is blank and the screen on an external monitor displays information.
System is in Suspend mode.
Display function was switched to the external monitor.
Press any key or touch the Touch Pad.
Use Fn + F2 to switch between LCD or CRT.
Internal display flashes or has garbled characters when computer is connected to external monitor.
The light tubes on the edge of the display panel do not light up at all and
The light tubes on the edge of the display panel do not light up at all and
Using 1024 × 768 or higher resolution on external monitor and have toggled back to internal display, which supports up to 800 × 600.
Improper backlight or display cable connections
Defective inverter board.
Defective display cable.
Defective display panel.
Defective system board.
Defective system board.
Restart the computer.
Replace the display assembly.
Replace the display assembly.
Replace the display assembly.
Replace the display assembly. 
Replace the system board.
Replace the system board.
Backlight (brightness) cannot be |
| Improper display cable |
| 1. Reseat the display cable to the |
adjusted with Fn + F7 (¯ ) or |
| connections. |
| system board. |
Fn + F8 (- ).*** |
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| 2. Replace the display assembly. |
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| Defective inverter board. |
| Replace the display assembly. |
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| Defective display cable. |
| Replace the display assembly. |
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| Defective system board. |
| Replace the system board. |
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| Defective inverter board. |
| Replace the display assembly. |
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| Defective display cable. |
| Replace the display assembly. |
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| Defective system board. |
| Replace the system board. |
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**This problem indicates that the backlight or its power circuitry has failed. Since you cannot observe the POST result on the display panel when the backlight is not functioning, connect the unit to an external monitor before powering the unit up. If an external monitor is not available, verify that POST completes by opening and closing the display, listening for the single or double beep, and watching for the LEDs turn on at the front of the computer.
This display panel has a continuous pattern |
| Improper display cable |
| Reseat the display cable to the | |
across it (e.g., a "jailbars" pattern), has a |
| connections |
| following until the problem is solved: | |
single color on it, or has garbled graphics |
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across the entire panel. This failure is for |
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| 1. | System board |
patterns across the entire panel (not just |
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on one section). |
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| 2. | Display assembly |
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file:///C/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (5 of 8)6/27/2004 5:05:13 AM