HP ProBook 645 G4 Maintenance And Service Manual page 30

Item Component
Intel Dual Band Wireless-AC 8265 802.11ac 2x2 Wi-Fi + Bluetooth 4.2 Combo Adapter
(non-vPro)
Realtek RTL8822BE 802.11ac 2x2 Wi-Fi + Bluetooth 4.2 Combo Adapter
Realtek RTL8821CE 802.11ac 1x1 Wi-Fi + Bluetooth 4.2 Combo Adapter
(18) Fan
(19) Heat sink
(20) System board
NOTE:
All system boards use the following part numbers:
xxxxxx-001: Non-Windows operating systems
xxxxxx-601: Windows operating system
AMD Ryzen 7 PRO 2700U
AMD Ryzen 5 PRO 2500U
AMD Ryzen 3 PRO 2300U
(21) RTC battery (includes cable)
(22) Battery (3-cell, 48 WHr, 4.212 Ahr)
(23) Internal frame
(24) Bottom cover
20 Chapter 3 Illustrated parts catalog
All system board spare part kits include replacement thermal material.
Spare part number
851594-001
915623-001
915621-001
L09535-001
L09537-001
L12802-xx1
L12801-xx1
L12800-xx1
857798-001
931719-850
L09540-001
L23633-001