HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 84

No power, Issues, possible causes, and fixes, continued

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Table 6-9 Issues, possible causes, and fixes (continued) Items Procedures Verify external power source (2. Examine the environment on page 61). Perform a hard reset (8. Hard reset on page 68). Verify AC adapter Verify the battery before verifying the AC adapter. However, you can verify the AC adapter first, before opening the service door for a battery check. ● Verify AC adapter is compatible with product. Verify that the part number is for this computer if possible. ● Verify AC adapter and power cord are good (no physical damage, bent middle ID pin). ● Verify AC adapter works on a verified working computer. ● Plug in AC adapter and power on computer without battery. ● Inspect power port on computer side for any damage, dust, or debris. ● Check power light (7. Status lights, blinking light codes, troubleshooting lights, and POST error messages on page 65). Rear power light indicates external power to the computer is good. Verify battery condition and status 1. Check battery condition (overall result, cycle life, voltage) using HP PC Hardware Diagnostics (UEFI) tool. 2. Verify that battery is installed properly in battery bay without a gap and that latch locks are tight (for models with removable batteries). 3. Check battery status light (7. Status lights, blinking light codes, troubleshooting lights, and POST error messages on page 65). Be sure that battery is not fully discharged, preventing system from booting. 4. Determine whether the computer can turn on with battery only. 5. Remove service door and test with a verified working battery. If the computer boots, inspect original battery before replacement. 6. Test battery with a verified working computer to verify that it works. 7. If the computer still does not boot, remove battery and boot on AC power only. The following steps are for authorized providers or technicians. Verify AC adapter voltage 1. Measure DC voltage output, which should be approximately 19.5 V dc. Acceptable voltage range is from 18.5 to 20.5 V dc. 2. If the DC voltage is out of range, replace the AC adapter. NOTE: This action requires a digital voltmeter. NOTE: Select models include a power cable Verify power button, power connector between the system board and chassis power connector. 1. Be sure that power button is not stuck. 2. Reseat power connector cable (if applicable). 3. Replace new power connector cable (if the cable exists and is defective) No power 75

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Table 6-9
Issues, possible causes, and fixes
(continued)
Items
Procedures
Verify external power source (
2. Examine the environment
on page
61
).
Perform a hard reset (
8. Hard reset
on page
68
).
Verify AC adapter
Verify the battery before verifying the AC adapter. However, you can verify the AC
adapter first, before opening the service door for a battery check.
●
Verify AC adapter is compatible with product. Verify that the part number is for
this computer if possible.
●
Verify AC adapter and power cord are good (no physical damage, bent middle ID
pin).
●
Verify AC adapter works on a verified working computer.
●
Plug in AC adapter and power on computer without battery.
●
Inspect power port on computer side for any damage, dust, or debris.
●
Check power light (
7. Status lights, blinking light codes, troubleshooting lights,
and POST error messages
on page
65
). Rear power light indicates external power
to the computer is good.
Verify battery condition and status
1.
Check battery condition (overall result, cycle life, voltage) using HP PC Hardware
Diagnostics (UEFI) tool.
2.
Verify that battery is installed properly in battery bay without a gap and that
latch locks are tight (for models with removable batteries).
3.
Check battery status light (
7. Status lights, blinking light codes, troubleshooting
lights, and POST error messages
on page
65
). Be sure that battery is not fully
discharged, preventing system from booting.
4.
Determine whether the computer can turn on with battery only.
5.
Remove service door and test with a verified working battery. If the computer
boots, inspect original battery before replacement.
6.
Test battery with a verified working computer to verify that it works.
7.
If the computer still does not boot, remove battery and boot on AC power only.
The following steps are for authorized providers or technicians.
Verify AC adapter voltage
1.
Measure DC voltage output, which should be approximately 19.5 V dc. Acceptable
voltage range is from 18.5 to 20.5 V dc.
2.
If the DC voltage is out of range, replace the AC adapter.
NOTE:
This action requires a digital voltmeter.
NOTE:
Select models include a power cable
between the system board and chassis power
connector.
Verify power button, power connector
1.
Be sure that power button is not stuck.
2.
Reseat power connector cable (if applicable).
3.
Replace new power connector cable (if the cable exists and is defective)
No power
75