HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 85

Intermittent power-on, shutdown, reboot, Use this information to troubleshoot power-on

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Table 6-9 Issues, possible causes, and fixes (continued) Items Procedures 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 65) 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 (11. Test with minimum configuration on page 70, 12. Test with verified working configuration (hardware or operating system) on page 71, 13. Replace the system board on page 71) by removing nonessential parts. 2. If the computer still does not boot, replace system board. Tips Computer automatically boots without pressing power button when the RTC 3 V battery is removed. Therefore, after the service door and RTC 3 V battery are removed, you do not have to press power button from top side. In essential hardware configuration, mWS G1 and G2 may require discrete graphics processing unit (GPU) to boot. However, mWS G3 can boot with integrated graphics. Intermittent power-on, shutdown, reboot Use this information to troubleshoot power-on, shutdown, and reboot issues. Table 6-10 Issues, possible causes, and fixes Items Procedures Symptoms ● Does not always turn on ● Intermittently hangs ● Intermittently shuts down ● Spontaneously reboots Possible causes Electrical short, fluctuating power source, unstable power rails, loose connections, bent pins, stray wires, dust, obvious damage, nearly faulty parts (bulging or leaking capacitor). Potentially turn into a no-power issue (No power on page 74). Troubleshooting steps 1. Visually check power ports on both AC adapter and computer sides. 2. Inspect power sources: a. Verify that the AC adapter is working correctly. Use a confirmed working adapter to test. b. Verify that battery is not depleted while system is in the Sleep state. Test with a confirmed working battery. The following steps are for authorized providers or technicians. 1. Follow actions in No power on page 74. a. Be sure that AC adapter has correct DC voltage. 76 Chapter 6 Troubleshooting guide

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Table 6-9
Issues, possible causes, and fixes
(continued)
Items
Procedures
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
65
)
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 (
11. Test with minimum
configuration
on
page
70
,
12. Test with
verified
working
configuration
(hardware or operating
system)
on page
71
,
13. Replace the system board
on page
71
) by removing
nonessential parts.
2.
If the computer still does not boot, replace system board.
Tips
Computer automatically boots without pressing power button when the RTC 3 V
battery is removed. Therefore, after the service door and RTC 3 V battery are removed,
you do not have to press power button from top side.
In essential hardware configuration, mWS G1 and G2 may require discrete graphics
processing unit (GPU) to boot. However, mWS G3 can boot with integrated graphics.
Intermittent power-on, shutdown, reboot
Use this information to troubleshoot power-on, shutdown, and reboot issues.
Table 6-10
Issues, possible causes, and fixes
Items
Procedures
Symptoms
●
Does not always turn on
●
Intermittently hangs
●
Intermittently shuts down
●
Spontaneously reboots
Possible causes
Electrical short, fluctuating power source, unstable power rails, loose connections, bent pins,
stray wires, dust, obvious damage, nearly faulty parts (bulging or leaking capacitor).
Potentially turn into a no-power issue (
No power
on page
74
).
Troubleshooting steps
1.
Visually check power ports on both AC adapter and computer sides.
2.
Inspect power sources:
a.
Verify that the AC adapter is working correctly. Use a confirmed working adapter to
test.
b.
Verify that battery is not depleted while system is in the Sleep state. Test with a
confirmed working battery.
The following steps are for authorized providers or technicians.
1.
Follow actions in
No power
on page
74
.
a.
Be sure that AC adapter has correct DC voltage.
76
Chapter 6
Troubleshooting guide