In this guide I will disassemble a Dell Precision 7720. I will remove the bottom case and battery cover in order to remove the battery, RAM, SSD, Wi-Fi card, keyboard, graphics card, cooling fan, heat sink and motherboard.
Processor: Intel Core i7-7920HQ (Quad Core 3.10 GHz, 4.10 GHz Turbo, 8MB 45W, w/Intel HD Graphics 630)
Operating System: Windows 10 Home
Display Type: 17.3″ UHD IPS Narrow Border (3840×2160) Wide View with Camera and Mic
Memory: Dual channel DDR4, 4*8GB=32GB, DDR4 2677MHz
Graphics Card: Radeon Pro WX 7100 w/8GB GDDR5
SSD: 1st M.2 PCIe 256GB SSD Class 40, 2nd Additional M.2 PCIe 256GB SSD Class 40, 3rd Additional M.2 PCIe 256GB SSD Class 40
Battery: 6-cell (91 Whr) Lithium Ion Polymer Battery with ExpressCharge
Wi-Fi: Intel Dual Band Wireless-AC 8265 2×2 802.11ac + BT4.0
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The bottom of the Precision 7720 is divided into two parts. Approximately one-third is the battery cover, and the upper part is the base cover. The base cover is mostly occupied occupied by four symmetrically distributed airflow panes. The left and right slightly smaller pane is the main intake window of the cooling fan, and the two larger panes near the center correspond to the memory slot position and the double M.2 slot position.
It is important to note that the four pads on the four corners of the bottom case, are consistent shape of the fillet long strip, its shape makes it very easy to clean up. Its material is relatively tough hardened rubber, pressed by hand without any deformation.
Carefully observe the top of the battery compartment inside the sticker, in addition to a variety of certification mark, you will find the following information: DELL Reg Model: P29E, Reg Type No: 29E002, DP/N: BY1X9 A00 DPC.
The above has been straight to said “2.5-inch hard drive”, but did not said 2.5-inch SATA hard drive, because this is not a pure SATA hard drive, but SATAe hard drive – that is an upgraded version of SATA 3: SATA express.
Intel originally tried to merge the two SATA 3.0 interface, theoretically get 6Gbps +6 Gbps = 12Gbps bandwidth, but found that there is a problem of backward compatibility, and the cost is high. So changed to use the PCI-E channel can theoretically be completely irrelevant to the original SATA. SATA express using the PCI-E 3.0X2, with the theoretical 16Gbps, which has greatly improved the 6Gbps of SATA 3.
In fact, in Precision 7720’s previous generation model, Precision 7710 has already used the SATA express hard disk in this 2.5 inch hard disk position. But this time, I’d like to know whether the SATA express used by Precision 7720 is PCI-E, 3.0X2 or PCI-E 3.0X4, and whether it supports NVMe completely.
Take a look at this M.2 to SATA express adapter board. The gold finger on the front SATA express interface is distinct from the ordinary SATA interface. It has more than 3+7 gold fingers, and the length is not uniform.
It is also possible to see the version Rev:1.0 (A00) marked on the circuit board, the manufacturing date of 2015-08-17, from this point of view, which should be the same version as the previous generation Precision 7710, which appeared on the market in 2015.
In the back of the adapter board, the number and arrangement of the 15+7 gold finger, and SATA exactly the same — this is why the SATA express compatible SATA, so why, Precision 7720 is also perfect to install and use 2.5-inch SATA hard drive.
The top right corner is the GPU cooling fan, the DC power jack cable is next to the GPU fan, if you need to remove the motherboard, you need to unplug the DC power jack cable from the motherboard. Below the GPU fan is the BIOS / COMS battery, It needs to be removed from the motherboard when you need to be completely disassembled.
The wireless network card Precision 7720 pre-installed an Intel 8265 wireless card, it is the 2230 M.2 card, support 802.11ac, and includes BT4.0. DELL more kind, Even if with 2X2 wireless card, but the laptop provides three antenna cables. Users can easily upgrade to 3X3 wireless network card.
If we want to continue to dismantle, we need to remove the keyboard. First of all we use plastic pick to unlock the keyboard frame, the keyboard frame edge has a lot of snaps, we need to slide the plastic pick, unlock all the snaps in order to remove Keyboard frame.
After removing the heat dissipation module can see the graphics card and CPU, and you can see the motherboard, each side has a small board, corresponding to left and right sides of the card slot and port.