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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.
System is in Suspend mode. Press any key or touch the Touch
Pad.
Internal display is blank and the
screen on an external monitor displays
information.
Display function was switched to the
external monitor.
Use Fn + F2 to switch between LCD
or CRT.
Internal display flashes or has garbled
characters when computer is
connected to external monitor.
Using 1024 × 768 or higher
resolution on external monitor and
have toggled back to internal
display, which supports up to
800 × 600.
Restart the computer.
The light tubes on the edge of the
display panel do not light up at all
and Power-On Self-Test (POST)
completes when the unit is powered
up.**
Improper backlight or display
cable connections
Replace the display assembly.
Defective inverter board. Replace the display assembly.
Defective display cable. Replace the display assembly.
Defective display panel. Replace the display assembly.
Defective system board. Replace the system board.
The light tubes on the edge of the
display panel do not light up at all
and Power-On Self-Test (POST) does
not complete when the unit is
powered up.**
Defective system board. Replace the system board.
Backlight (brightness) cannot be
adjusted with Fn + F7 (¯ ) or
Fn + F8 (- ).***
Improper display cable
connections.
1. Reseat the display cable to the
system board.
2. Replace the display assembly.
Defective inverter board. Replace the display assembly.
Defective display cable. Replace the display assembly.
Defective system board. Replace the system board.
Defective inverter board. Replace the display assembly.
Defective display cable. Replace the display assembly.
Defective system board. Replace the system board.
** 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
across it (e.g., a "jailbars" pattern), has a
single color on it, or has garbled graphics
across the entire panel. This failure is for
patterns across the entire panel (not just
on one section).
Improper display cable
connections
Reseat the display cable to the
following until the problem is solved:
1. System board
2. Display assembly
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (5 of 8)6/27/2004 5:05:13 AM