MacBook Motherboard Diagnose Tool & Serial Number Tool EBC 820

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MacBook Motherboard Diagnose Tool & Serial Number Tool EBC 820


Instructions and Applicable Mac Models

The packing list of EBC-820 includes the main device (Mac Assistant), an EBC U disk, and two data cables)

EBC-820 is designed for Apple Mac repair (Applicable models are iMac, Mac mini, MacBook Air, and MacBook Pro). Mac Assistant is used for checking the working condition of the motherboard of Apple Macs and find the fault points of the motherboard by displaying the codes, which can save lots of time for Mac repair technicians and enthusiasts.

Mac Assistant

There are 2 different data cables for different mac models and years, both cables are designed for Mac Assistant.

Applicable Mac models and years:

MacBook Air: A1370 year 10-11, A1465 year 12-14, A1369 year 10-11, A1466 year 12-14,

MacBook Pro: A1425 year 12-13, A1398 year 12-14, A1502 year 13-14

Mac mini: A1347 year 12-14

Mac Assistant can accurately find out the fault points of the motherboard. By checking the working condition of the chips, the motherboard can be repaired quickly.

Mac Assistant can be connected directly to the SAM connectors through the data cables without powering the motherboard, easy and convenient.

EBC U DISK(Why do we need it: 

1, you need to add a new serial number if you want to replace the motherboard, 

2. you need to add a new serial number if you flash new BIOS data, 

3. you can use it to inquiry the original serial number of the motherboard after replacing a new bottom case)

 1. It can inquiry the serial number of the motherboard

 2. You can use it to add a new serial number for the motherboard

3. You can use it to add and inquiry the serial numbers in a very simple and fast way

Mac Assistant: The error codes and the way to diagnosis

 Let’s take MacBook Pro A1398 year 14(model 820-3787-A) as an example:

1. CPU with error codes 0-0C-0d, 0,

(1.1 If the codes changing from a series of other numbers to “0”, it means that the motherboard has tested itself and can work properly.

1.2 If the code “0” appears as soon as we power the motherboard, and it remains unchanged, that means the motherboard is not running)

Repair methods and ideas: firstly, check the working condition of CPU and PCH(circuit of CPU U0500:PPVCCIO_S0_CPU, =PP1V5R1V35_S0_CPU, =PPVCC_S0_CPU, and circuit of PCH U1100:  =PP1V05_S0_PCH_VCC,=PP3V3_S0_FET,=PP1V5_S0_REG)

1.3 If the CPU chip is damaged, then replace it with a new CPU chip

1.4 If the PCH chip is damaged, then replace it with a new PCH chip

1.5 The damage of each peripheral control chips causes the CPU not to working


2. Memory with error codes 0-0C-0d-32, 0-0C-0d-38, 0-0C-0d-RR, 0-0C-0d-Rb,0-0C-0d-RC, 0-0C-0d-23-28

 Repair method and idea: 

2.1 Firstly, check the working condition of the memory chips(=PPDDR_S3_REG,PPVREF_S3_MEM_VREFDQ_A,PPVREF_S3_MEM_VREFCA_A,=PP1V5R1V35_S3_MEM_A,=PPVTT_S0_MEM_A,MEM_RESET_L,MEM_A_CLK_P<0>,MEM_A_CLK_N<0>)

2.2 If the memory chips damaged, they replace with new chips

2.3 If the CPU chips damaged, they replace with new chips

Graphics chip with error codes: 0-0C-0d-38-46-55,0-0C-0d-28-12

Repair method and ideas:

3.1 Firstly, check the working condition of the graphic chip, (circuits of GPU U8400 are =PPVCORE_GPU,=PP1V35_GPU_FBVDDQ,=PP1V05_S0GPU_REG,=PP3V3_S0GPU_MISC_FET,=PP3V3_S0GPU_FET). Secondly, check the working condition of the video memory chip

3.2 If the graphic chip damaged, then replace it with a new one

3.3 If the video memory chip damaged, then replace it with a new one


4.  The normal displayed devices with codes 0-0C-0d-38-46-55-12-51,0-0C-0d-28-12-51-58-95-96-68, 0-0C-0d-23-28-12-58, 0-0C-0d-56-46-28-12-51-58

When the code ends with 51 or 58 after running, yet the screen still not displaying:

1. change a new screen, 2. check the screen cable, 3. check the screen connector on the motherboard)

Meaning of the indicators on Mac Assistant

CLK: it keeps lighting after powering on, otherwise the CLK is damaged

RST: it will light out 1 sec later after turning on the device, if not, then the reset circuit is broken.


EBC 820 Manual (EBC-820_Manual.pdf, 94 Kb) [Download]

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LCD Screen Grades

ConditionDescriptionLCDGlassFlex CableFrameAppearance Intactness
Aftermarket BasicChina LCDJKAftermarketAftermarketAftermarketNew
Aftermarket StandardFlex Cable ReplacedOriginalAftermarketOriginalAftermarketNew
Aftermarket SelectedGlass ReplacedOriginalAftermarketOriginalAftermarketNew
Original PullsPull From Used DevicesOriginalOriginalOriginalOriginalNew Alike
OriginalOriginal Equipment ManufacturerOriginalOriginalOriginalOriginalNew

In Union Repair store, we grade our iPhone screen into 5 different types of quality on the basis of different material assembled. The following is the full details of each condition.


After Market Basic

It is with widely accept major complaint replacements for original parts, which keeps a right balance between price and quality. It has sustainable supplying chain in China, and all the components of the screen are copy quality. Typically, the LCD screen is from several different factories, the most popular 4 on China market are JK,AUO, LongTeng, and ShenChao. By comparing the brightness and sharpness of the LCD, we found JK is the best quality among them and the second best is AUO. No doubt, the other components on the screen are all copy.


After Market Standard

It is better than After Market Basic cause it comes with original laminated flexes and the LCD panel. Other components like touch panel, frame(hot pressed), backlight, polarize lens, and OCA is all copy from different factories.


After Market Selected

The core components (like LCD and flexes) is 100% original pulled from used iPhone while the frame and touch panel is copy. The touch panel and frame come together with cold pressed glue and assembled together with the LCD by the capable third-party factory which keeps its excellent quality. 


Original Pulls

No doubt, it is tear down from used iPhone with all the parts 100% original and working perfectly just like an original new screen, it has whatever the original new screen has. The only complaint about this quality is that some of the displays are with 1 or 2 scratches but still be welcome by our critical customers who are requiring good quality.


Original New

It is 100% original from Apple-authorized factories like Toshiba, Sharp, and LG. We get this kind of screen from the first level dealer. The touch panel of the screen is oleophobic coated which prevents from fingerprints when using your iPhone. And starting with iPhone 7g, the backlight from different authorized factories comes with a different code. Backlight from Sharp has the code begins with DKH/CON, from Toshiba begins with C11/F7C/FZQ, from LG begins with DTP/C3F. 



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