HP Elite x2 G8 Maintenance And Service Manual page 96

Table 7-9 Issues, possible causes, and fixes (continued)
Items
The following steps are for authorized providers or technicians.
NOTE: Select models include a power cable
between the system board and chassis power
connector.
86 Chapter 7 Troubleshooting guide
Procedures
Check power light (7. Status lights, blinking light codes, troubleshooting lights,
●
and POST error messages on page
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
lights, and POST error messages on page
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.
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.
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 or pins to turn on 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 76)
At this point, there should be sufficient power from the AC adapter to the system
board. Expect to hear the fan spinning and see blinking lights or error messages (for
example, faulty memory, HDD).
Verify system board
1. Test essential hardware configuration
page 80, 12. Test with verified working configuration (hardware or operating
system) on page 82, 13. Replace the system board on page
nonessential parts.
2. If the computer still does not boot, replace system board.
76). Rear power light indicates external power
(7. Status lights, blinking light codes, troubleshooting
76). Be sure that battery is not fully
(11. Test with minimum configuration on
82) by removing