System Start Failure; Power Supply Failure - Digital Equipment HiNote VP 500 Series Service Manual

Troubleshooting
Verify that a component is the only malfunctioning part of the computer by replacing the
malfunctioning component with a good one, and then try to run the system. For example, if
you have tested an FDD in a test computer and found it to be bad, you should also try a good
FDD in the malfunctioning FDD's computer to be sure that another component (such as the
FDD controller) is not bad as well.
As with assembly and disassembly, make sure you have adequate lighting, the right tools, and
a stable clean working environment.
The examples that follow provide useful tips and information that will help isolate and solve
some of the more common problems that may be encountered.

System Start Failure

When you turn on the computer, the system hangs before completing or starting the POST
(power on self test). Power supply failure, post failure, and boot-up failure can result in a
system start failure.

Power Supply Failure

Problem
You turn on the power switch and the following
conditions apply:
•
There is no panel display
•
There is no noise coming from the HDD
•
The power indicator light is off.
3–2 Digital HiNote VP 500 Service Guide
Troubleshooting Procedure
If you are operating the Notebook using the
battery:
•
The battery connection is loose. Replace
the battery.
•
The battery power is depleted or the battery
is bad. Plug in the AC adapter, or replace
the battery.
If you are operating the Notebook using the AC
adapter:
•
Check that the AC adapter is plugged into
an operational power supply.
•
Check that the AC adapter is connected
securely to the Notebook's AC adapter
socket.
•
Check to see if the Power LED on the
computer is lit. If it is not lit, then the AC
adapter is bad. Replace the AC adapter,
and test the Notebook again.
Press the system's "Reset Button" located on the
back of the unit between the serial and parallel
port connectors.
If the above items are functioning, then the
Notebook's internal power circuit is probably
damaged. Check the power circuit of the
Notebook.