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5-3
91390 QUBE
TROUBLESHOOTING
System
When this screen is shown, the monitor automatically begins
Power-On diagnostics. Any diagnostic failures are reported in the
upper window. If no serious diagnostics failures are encountered, the
monitor continues past this screen and starts normal monitor
operation.
You can halt the booting operation during the 4-3-2-1 countdown
and a Boot menu can be shown.
The Boot menu and the power-ON diagnostics are described in the
sections that follow.
Power-ON Diagnostics
Power-ON diagnostic tests make sure of system hardware integrity
during power-on and can often help isolate and troubleshoot a
problem. Most of these tests can also be done in the extended
diagnostic mode.
The diagnostics done at power-ON include:
• CPU—reads and writes control registers and does an internal
wraparound of one serial communication controller channel.
• DRAM read/write—reads and writes DRAM above 1 MB.
• Real-time clock—makes sure that the clock is running.
• GDS SRAM—reads and writes all of the SRAM, nondestructively.
• Video—tests the video memory, video controller, H-sync, and
blue video signals.
• Ethernet—reads and writes control registers.
• Flash checksum—checksums all flash memory.
• Touchscreen—tests the touchscreen controller.
• Audio—reads and writes control registers in the codec.
Power-ON diagnostic failures are reported in the upper portion of
the System Startup screen. For more information, refer to Boot
Menu on page 5-4.
Any error that occurs during one of these tests is logged in the
nonvolatile configuration memory. To retrieve the log, refer to Error
Log on page 5-11.
You can halt the booting operation during the 4-3-2-1 countdown to
enter the Boot menu. A description of the Boot menu is given in the
next section.
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