HP ZBook Studio x360 Maintenance and Service Guide - Page 105

Verify AC adapter, Verify blinking lights

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Items Procedures Verify AC adapter It is preferable to 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 84). Rear power light indicates external power to the computer is good. NOTE: Refer to battery replacement section for removing/replacing the battery Verify battery condition/status 1. Check battery condition (overall result, cycle life, voltage, etc.) using HP PC Hardware Diagnostics (UEFI) or HPSA tools. 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 84). 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 is OK. 7. If there is still no boot, remove battery and boot on AC power only. The sections below are intended for authorized service providers/technicians. Verify AC adapter - voltage 1. Measure DC voltage output that should be around 19.5 VDC and acceptable voltage range is from 18.5 - 20.5 VDC. 2. If the DC voltage is out of range, replace the AC adapter. NOTE: This action requires a digital voltmeter. NOTE: 2015 mWS does not have the power cable between system board and power connector on chassis 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) 4. To isolate faulty power connector cable and power button, technicians can short power-on pads/pins to power up the computer. Contact HP Engineering for this information. Verify blinking lights (7. Status lights, blinking light codes, troubleshooting lights, and POST error messages on page 84) Common issues and possible solutions 93

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Items
Procedures
Verify AC adapter
It is preferable to 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
84
). Rear power light indicates external power
to the computer is good.
NOTE:
Refer to battery replacement section
for removing/replacing the battery
Verify battery condition/status
1.
Check battery condition (overall result, cycle life, voltage, etc.) using HP PC
Hardware Diagnostics (UEFI) or HPSA tools.
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
84
). 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 is OK.
7.
If there is still no boot, remove battery and boot on AC power only.
The sections below are intended for authorized service providers/technicians.
Verify AC adapter – voltage
1.
Measure DC voltage output that should be around 19.5 VDC and acceptable
voltage range is from 18.5 – 20.5 VDC.
2.
If the DC voltage is out of range, replace the AC adapter.
NOTE:
This action requires a digital voltmeter.
NOTE:
2015 mWS does not have the power
cable between system board and power
connector on chassis
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)
4.
To isolate faulty power connector cable and power button, technicians can short
power-on pads/pins to power up the computer. Contact HP Engineering for this
information.
Verify blinking lights
(
7. Status lights, blinking light codes, troubleshooting lights,
and POST error messages
on page
84
)
Common issues and possible solutions
93