A friend loaned me his laptop to repair and/or diagnose. The laptop doesn’t power on.
Before attempting repair, some intelligence gathering is in order:
HP Pavilion dv5215us
|HP Spare||381090-001||HP-OK065B13 LF|
AC power cord (for DC adapter)
Isolation of the failed component is the next task. Given the complaint, failure in the following are possibilities:
- AC power cord
- DC adapter/cord assembly
- laptop’s power jack
- laptop power system
- laptop battery (possibly shorted)
|I verified the existence of the power problem by trying to start the computer with the included adapter.||The computer failed to power up.
I noticed that the unloaded power adapter is cool to the touch. (Since adapters typically radiate waste energy as heat this could indicate a failure in the AC power cord or the adapter itself.)
|I then began to isolate various components. Special thanks go to the friendly staff at the local Radio Shack, who provided the multimeter and the test power supply.|
|Multimeter readings were taken from the DC adapter.||The AC power cable tested OK.
The DC adapter failed to deliver any power.
|An aftermarket power adapter was connected.||
A search determined two likely causes of the failed boot/video:
- loose hardware component (typically RAM or hard drive)
- bad motherboard
- The AC power cord is OK.
- The DC adapter/cord assembly has failed. (as suspected)
There’s a possibility I will be unable to either determine the cause or find a solution to the laptop’s problems.
I plan to give my friend various options to recover their data.