820-00480 not recognize ssd

yair37

Member
question mark folder , no water damage, i was try good know ssd but the same.. and do not show on disk utility.
before it was work but if i was shout it out with the charger connected and turn it on it wasn't work! other way it was work ok.
but now it wont work anymore.
 

piernov

Moderator
Staff member
First you should check if the machine is affected by https://support.apple.com/13-inch-macbook-pro-solid-state-drive-service

About compatibility between 2016/2017:
After extensive testing with every Gen. 5A drive we could get our hands on, it appears that 128GB SSDs with part numbers beginning with 656-0074 and 256GB SSDs with part numbers beginning with 656-0076 are only compatible with the model A1708 laptops from the Mid 2017 release.
820-00840 being the 2017 model, it shouldn't be a problem.
Note that the SSD_BOOT_L/SSD_PWR_EN_L circuit is different between 820-00875 (2016) and 820-00840 (2017). Only the schematics for 820-00875 is available, in this one U8640/R8645 are populated while R8641/R8642 are not. On the 820-00840 it's the opposite.
 

yair37

Member
thanks for that, i do have 820-00840 scheme and boardview, im also put good ssd from the same board number (2017) but it not recognized it to.
 

2informaticos

Administrator
Staff member
First check L8600/02.
Next check input and output levels for U8640.
Also need to know SSD_RESET_L and SSD_CLKREQ_L levels.
SSD_EN goes high?
 

yair37

Member
L8600:
1.PP3V3_SSD_FLT -0V
2.PP3V3_S5_SSD_SNS-3.3V

L8602:
1.PPBUS_SSD_FLT 0V
2. PPBUS_G3H_SSD - 13V


U8640:
pp1v8_s5g -1.8v stable
all the rest 1.8v-0v pulsing at the beginning and then 0v.

SSD_RESET_L - 3.3V
SSD_CLKREQ_L - 3.3V
SSD_EN 3.3V
 
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