A few days ago, we disassembled the 21.5-inch non 4k version of iMac 2015 (hereinafter referred to as the standard version). Today, iFixit brings us Retina 4K version. The two are very similar in overall structure. Except that the display circuit board and some chips on the motherboard are different, the cooling fan, hard disk and speaker are no different from the standard version. Now please follow the steps of Xiaobian to see the difference between the 4K version and the standard version.

• Intel Core i5-5675R Quad Core 3.1 GHz (Remax 3.6GHz) optional i7 Quad Core 3.3Ghz (Remax 3.8Ghz)

  [The standard version CPU is i5 dual core 1.6Ghz (Remax) or i5 quad core 2.8Ghz (Remax)]

• 8 GB 1867 MHz LPDDR3 memory (2 × 4GB)

• Intel Iris Pro Graphics 6200 Display Core

  [The standard version is HD Graphics 6200 (Core i5 1.6GHz dual core) or Iris Pro Graphics 6200 (Core i5 2.8GHz quad core)]

• 1 TB (5400 rpm) mechanical hard disk, optional configuration up to 2 TB Fusion Drive or 512 GB SSD.

  [1TB Fusion Drive and 256GB SSD for non 4K versions]

It is worth mentioning that the EMC code of the 4K version is 2833, and the EMC code of the ordinary version is 2889.

Let's compare the difference between the standard iMac 21.5 2015 and the 4K iMac 21.5 2015. The left side is a 4K screen, and the right side is a standard 1920 × 1080 screen. The difference in fineness between the two is very obvious.

In order to meet the bandwidth requirements of 4K resolution, the display cable is widened to 16.4mm, and the standard version is 12.4mm.

Like the standard version, the 4K version of the display is also provided by LG. The model is LM215UH1 (SD) (A1), and the standard version model is LM215WF3 (SD) (D5).  

• Red: Texas Instruments TPS65168 high resolution, programmable LCD Bias

• Orange: TI TPS54320 4.5 V to 17 V input, 3A synchronous step-down SWIFT converter

• Yellow: TI TPS54218 4.5 V to 17 V input, 3A synchronous step-down SWIFT converter

• Green: Purui DP665 LCD timing controller (the same model as the 5K iMac 27)

• Light blue: TI NH245 55K G4

• Dark blue: Texas Instruments BUF16821 programmable gamma voltage generator and VCOM calibrator

• Red: Intel SR2AJ Core i5-5675R 3.1 GHz quad core processor (4M cache, Remax up to 3.60 GHz) and Intel Iris Pro Graphics 6200 display core

• Orange: Samsung K4E6E304EE-EGCF 16Gbit LPDDR3 1867MHz SDRAM memory (4 memory chips, 8 GB capacity in total)

• Yellow: Broadcom BCM5776 Gigabit Ethernet controller

• Green: Texas Instruments LM4FS1EH SMC controller

• Light blue: TI HD3SS213 5.4Gbps DisplayPort 1.2a 2:1/1:2 differential switch

• Dark blue: Fairchild Semiconductor FDMF6808N ultra small size, high-performance, high-frequency DrMOS module

• Red: Intel DSL5520 Thunderbolt 2 controller

• Orange: Cirrus Logic 4208-CRZ audio controller

• Yellow: Delta 8904C-F filter

• Green: Vimicro VC0359 camera processor

• Light blue: Intersil ISL6372CRTZ power controller

• Dark blue: Huabang 25064FVIQ

• Purple: International Rectifier IRFH3702 30V Single N-Channel HEXFET Power MOSFET driver

Well, our disassembly is over here. The old rule is to have a family photo. The iFixit gave the iMac 21.5 2015 4K version a maintenance score of 1 point (10 points are the easiest to repair), which is consistent with the standard iMac 21.5. Both of them also adopt the design that the CPU and memory are welded to the motherboard, and cannot be replaced by themselves. They are only equipped with a hard disk bit, and users cannot add hard disks by themselves.

(Source: iFixit， Translation: 91 disassembly)

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