Maintenance and Service Guide
Display ............................................................................................................................................. 108
Display anomalies ......................................................................................................... 108
Symptom .................................................................................................... 108
Quick check ................................................................................................. 109
HP PC Hardware Diagnostics (UEFI) for video test ..................................... 110
Display assembly diagram ......................................................................... 111
Dead pixel ..................................................................................................................... 111
No video (internal) ........................................................................................................ 111
No video (external) ....................................................................................................... 112
DisplayPort/VGA ........................................................................................................... 112
HDMI .............................................................................................................................. 112
No or bad external video via docking ........................................................................... 113
Incorrect or missing color/distorted image .................................................................. 113
Touch screen ................................................................................................................. 114
I/O devices ....................................................................................................................................... 115
Keyboard ....................................................................................................................... 115
Keyboard point stick ..................................................................................................... 116
Keyboard backlight ....................................................................................................... 116
TouchPad ....................................................................................................................... 117
Network Connectivity Ethernet (RJ-45 jack) ................................................................ 117
Network connectivity wireless (WLAN) ........................................................................ 118
USB ................................................................................................................................ 119
Smart card reader ......................................................................................................... 120
Speaker, headphone - audio issues .............................................................................. 121
Thunderbolt (TB) ........................................................................................................... 122
Storage ............................................................................................................................................ 123
Hard drive/solid-state drive not recognized ................................................................ 124
No boot to operating system (no read/write error) ..................................................... 124
Read-write error ........................................................................................................... 125
Slow performance ......................................................................................................... 125
Blue screen (BSOD) error .............................................................................................. 125
Noisy hard drive ............................................................................................................ 126
Mechanical ....................................................................................................................................... 127
Fan error message - 90B .............................................................................................. 127
Noise (sound) ................................................................................................................ 128
Fan runs constantly ...................................................................................................... 129
Thermal shutdown (hot) ............................................................................................... 130
Stuck power button ...................................................................................................... 130
Additional information ...................................................................................................................................... 131
Acronyms ......................................................................................................................................... 131
Blinking lights and boot error codes ............................................................................................... 132
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