iMac Logicboard Replacement - Different Display Connection

[nmbgeek]

I am replacing the display on a 2015 iMac 21.5". I believe it had a 1.8ghz processor and the replacement/upgrade is also a 2015 iMac 21.5" but with a 2.8ghz. Anyways everything lines up and looks identical, installed great, and then when I went to reconnect the display I ran into what appears to be a major snag. The new connector for LCD is slightly larger (about 1/4 inch) than the old connector. I am guessing that the larger ribbon is for a retina display? Can someone let me know what the best solution to this is. Should I just order new logic board or order a new display? The glass on this model does have a slight chip in it.

The original is approximately 3/4" connection and new is approx 7/8"

 

[chscag]

There were 2 models for the 21.5" 2015 iMacs. One was Retina 4K, the other standard. You can not switch displays nor the logic board since the connector is different for the display. You need to decide which model you have; Retina or standard? And order the correct logic board. If the glass has a chip on it, the entire display will have to be changed out as the glass is glued to the display and can not be separated.

 

[nmbgeek]

Do you know which has the larger ribbon cable?

Edit: I confirmed by serial that this is the non-retina version. Thank you for your help.

 

[nmbgeek]

I cannot find a 4k or 5k 2015 imac with 2.8ghz. https://everymac.com/systems/by_year/macs-released-in-2015.html

The board I ordered is part number 820-00431-02. Apparently the part I need is 661-02884.

Is there any way to tell what processor is or should be in this 820-00431-02 without removing the heat sync? I want to make sure that this part was listed correctly. The listing was here: https://www.ebay.com/itm/Apple-iMac...te-2015-MOTHERBOARD-820-00431-02/292409108675

 

[chscag]

Some specs:

*************

OVERVIEW

Introduced October 2015
Discontinued June 2017
Model Identifier iMac16,1 (1.6 GHz) iMac16,2 (2.8 GHz)
Model Number A1418
EMC 2889
Order Number MK142LL/A (1.6 GHz), MK442LL/A (2.8 GHz)
Initial Price $1,099 (1.6 GHz) $1,299 (2.8 GHz)
Current Price Show Current Price
Support Status Supported
Colors Silver and Black
Weight and Dimensions 12.5 lbs., 17.7" H x 20.8" W x 6.9" D

PROCESSOR

Processor Intel Core i5 (5250U, 5575R) ("Broadwell")
Processor Speed 1.6 or 2.8 GHz
Maximum Processor Speed Up to 2.7 or 3.3 GHz
Architecture 64-bit
Number of Cores 2 (1.6 GHz) 4 (2.8 GHz)
Cache 3 MB (1.6 GHz) 4 MB (2.8 GHz) L3
System Bus Intel Direct Media Interface (DMI) at 5 GT/s

STORAGE AND MEDIA

Storage 1 TB (5400-rpm SATA), 1 or 2 TB Fusion Drive, or 256 flash storage
Media None

PERIPHERALS

Peripherals Apple Magic Keyboard, Magic Mouse 2 or Magic Trackpad 2

*****************

You can see that particular model could be ordered either with 1.6 GHZ or 2.8 GHZ CPU. BTW, I use MacTracker which is usually more accurate than "EveryMac.com".