The new 21.5-inch iMac launched by Apple this week is a comprehensive upgrade compared with the previous generation. The display screen with 4K resolution and wider color gamut is equipped with faster and stronger processors and graphics cards. Two Thunderbolt 2 interfaces have also been added. According to foreign media, the iMac is still the best all-in-one machine at present. Now let's explore the black technology in the 2015 21.5-inch iMac. (Source: ifixit, translation: 91 disassembly)
The old rule, before dismantling, let's see the new changes of 2015 21.5-inch iMac:
Intel Core i5 Quad Core 3.1GHz
8 GB 1867 MHz LPDDR3 memory (4 × 2 GB)
Intel HD Graphics 6000/Intel Iris Pro Graphics 6200
1 TB (5400 rpm) hard disk, or up to 1 TB Fusion Drive or 256 GB flash memory
Support 802.11ac Wi Fi wireless+Bluetooth 4.0
The new iMac has a headphone jack, SD card slot, four USB 3.0 interfaces and network cable interfaces, and two Thunderbolt 2 interfaces.
Use the iMac disassembly special tool to gently scratch the edge seam of the screen panel
It is easy to open the screen panel, and it can be found that the edge seam between the screen panel and the rear panel is fixed with adhesive.
The new iMac, a display screen with a resolution of up to 4K, is manufactured by LG
Remove the metal baffle
Like the previous generation of iMac, the display screen has its own independent set of control motherboard:
Red: Texas Instruments BUF16821 programmable gamma voltage generator
Orange: Richtek RT8250 synchronous step-down converter
Yellow: ST Microelectronics 404RP K516
Green: Winbond W25X20CL 2 MB flash memory chip
Remove the speaker, hard disk and cooling fan from the rear panel, and you can find that the hard disk is smaller than the previous generation.
Remove two screws, remove the metal clip fixing the antenna, and pull out four antennas
Slowly take the mainboard out of the rear housing
Take a look at the front of this motherboard:
Red: Intel SR26C Core i5-5250U processor with main frequency of 2.70 GHz and Intel HD Graphics 6000 graphics card
Orange: Samsung K4E6E304EE-EGCF 16GB LPDDR3 1867 MHz memory
Yellow: Broadcom BCM5776 Gigabit Ethernet controller
Green: Texas Instruments LM4FS1EH SMC controller
Light blue: Adesto AT45DB021E 2 MB SPI serial flash memory
Dark blue: National Semiconductor 545AR6SU
Purple: Delta 8904C-F filter
On the back:
Red: Intel DSL5520Thunderbolt 2 controller
Orange: Cirrus Logic 4208-CRZ audio controller
Yellow: MacronixMX25L6473E 64 MB multi-function I/O flash memory
Green: Vimicro VC0359 camera processor
Light blue: Intersil ISL62383CHRTZ power controller
Dark blue: Intersil ISL95826
This is the Airport card on the new iMac
The disassembly of the entire 2015 21.5-inch iMac has ended. The maintenance difficulty given by ifixit is 1 point (10 points out of 10 is the easiest to repair). The display and rear panel can only be separated by using the iMac special disassembly tool. The memory and CPU are soldered to the motherboard, which is difficult to upgrade and replace. The integration of the display increases the maintenance cost.
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