Intermittent Power-On, Shutdown, Reboot - HP ZBook Studio x360 G5 Maintenance And Service Manual

Items
Tips and tricks

Intermittent power-on, shutdown, reboot

Items
Symptoms
Does not always turn on
●
● Intermittently hangs
● Intermittently shuts down
● Spontaneously reboots
The sections below are intended for authorized service providers/technicians.
94 Chapter 6 Troubleshooting guide
Procedures
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 (i.e.,
faulty memory, HDD, etc)
Verify system board
1. Test essential hardware configuration
on page 88, 12. Test with verified working configuration (hardware and/or
operating system) on page
removing nonessential parts.
2. If there is still no boot, replace system board.
In essential hardware configuration, mWS G1 and G2 may require discrete GPU to boot.
However, mWS G3 can boot with integrated graphics.
Procedures
Possible causes
Electrical short, fluctuating power source, unstable power rails, loose connections, bent pins,
stray wires, dust, obvious damage, nearly faulty parts (bulging/leaking capacitor).
Potentially will turn into a no power issue soon
Troubleshooting steps
1. Visually check power ports on both AC adapter and computer sides.
2. Inspect power sources:
a. Verify AC adapter working correctly. Use a confirmed working adapter to test.
b. Verify that battery is not depleted while system is in Sleep state. Test with a
confirmed working battery.
1. Follow actions in No Power on page
a. Be sure that AC adapter has correct DC voltage.
b. Verify battery - test with a confirmed working battery.
c. Verify that power button is not stuck.
d. Verify that power connector is not loose.
e. Remedy loose connections and reseat major components (processor, memory, GPU,
hard drive/solid-state drive, etc).
2. Perform visual check for loose connections, bent pins, stray wires, dust, nearly faulty parts
(bulging/leaking capacitor).
3. Test essential hardware configuration
a. If system boots, reinstall nonessential hardware one component at a time to isolate
issue.
b. If system does not boot, replace essential hardware with verified working parts, one
component at a time. If system still does not boot, replace system board.
(11. Test with minimum configuration
89, 13. Replace the system board on page
(No Power on page 92).
92.
(11. Test with minimum configuration on page
89) by
88)