CHAPTER 4: Troubleshooting
118
Testing the memory
Memory errors can stop your programs, show error messages on the screen, or
hang the system.
To test the memory:
1
Boot from the diagnostics diskette and start the diagnostics program.
2
Run the Memory Test and see if the test completes successfully.
3
Press F2 in the test items.
4
Follow the instructions in the message window.
Testing the power system
To test for a power problem:
•
Turn on the notebook using each of the following power sources:
•
Remove the battery pack, connect the power adapter, then make sure
that the notebook turns on using AC power.
•
Disconnect the power adapter, install a charged battery pack, then make
sure that power is supplied by the battery pack.
If you suspect a power problem, complete the appropriate power supply check:
•
“Check the power adapter” on page 118
•
“Check the battery pack” on page 119
Check the power adapter
Unplug the power adapter cable from the notebook and measure the output
voltage at the power adapter cable plug. See the following figure.
•
If the voltage is not correct, replace the power adapter.
•
If the voltage is within the range, do the following:
•
Replace the system board.
•
If the problem is not corrected, see
“Undetermined problems” on page
133
.
•
If the power-on indicator does not light up, check the power adapter’s
power cord for correct continuity and installation.
•
If the operational charge does not work,
see “Check the battery pack”
on page 119
.
Important
Make sure that each memory card is fully installed into the connector.
A loose connection can cause an error.
Pin 1: +19 to +20.5V
Pin 2: 0V, Ground
Important
An audible noise from the power adapter does not always indicate
a defect.
Summary of Contents for NV55
Page 1: ... NV55 SERVICEGUIDE ...
Page 6: ...Contents iv ...
Page 12: ...CHAPTER 1 System specifications 6 System block diagram ...
Page 48: ...CHAPTER 2 System utilities 42 ...
Page 140: ...CHAPTER 4 Troubleshooting 134 ...
Page 141: ...CHAPTER5 135 Connector locations System board layout ...
Page 145: ...CHAPTER6 139 FRU Field Replaceable Unit list Introduction Exploded diagram FRU list ...
Page 152: ...CHAPTER 6 FRU Field Replaceable Unit list 146 ...
Page 153: ...APPENDIXA 147 Test compatible components Introduction Microsoft Windows 7 Compatibility Test ...
Page 156: ...APPENDIX A Test compatible components 150 ...
Page 157: ...APPENDIXB 151 Online support information ...
Page 163: ......
Page 164: ...MAN NV5x SVC GDE R1 04 09 ...