820-3332 A Not recognizing, doesn't see SSD, questionmark folder.

[mjanuchta]

Hello I have 820-3332 with problem with detected ssd, voltage and resistance in connector is normal, i replace U4510 but still the same, drive was seen when i connect with usb. SSD have HFS. About history of this computer i know that customer put in this bad adapter with this ssd (photos). After this operation, Macbook don't recognizing any SSD in J4501.

SSD_P3V3S0_EN - 3,34V
SSD_RESET_L - 3,34V
PP3V3 S0 SSD FLT - 3,34

This is my first topic, if I do something wrong, please correct me.

 

[mjanuchta]

After when I write this topic, i find solution. Problem is in L4500, this bad coil Have 500 Ohms. Customer do short PP3V3 S0 SSD FLT and Coil was burned in half.

 

[2informaticos]

Always check real ohm value of a coil in case like this.
You can get normal voltage without SSD, but voltage drops drastically once SSD is inserted.

BTW, welcome to the forum!