LDM

This video shows the teardown, the reverse engineering and the test of a servomotor used in the Iranian Shahed-136 kamikaze drone (also called Geranium-2) .
00:00 - Intro
01:46 - Teardown
02:36 - Electronic board
03:16 - Test
06:15 - Reverse-engineering - overview
06:47 - Reverse polarity protection
08:15 - Power supply
08:54 - Brushless motor power stage
10:03 - PWM input interface
10:27 - Feedback device
10:46 - Feedback output circuit

active parts used:

SED10070GG: N-channel MOSFET (x7)
https://www.lcsc.com/datasheet/lcsc_d...

SGM8591: Single-Supply, Single Rail-to-Rail I/O Precision Operational Amplifier
https://www.sg-micro.com/rect/assets/...

EG2134 芯片用户手册 三相独立半桥驱动芯片
https://www.lcsc.com/datasheet/lcsc_d...

TLP2361
https://eu.mouser.com/datasheet/2/408...

XL7005A - 0.4A 150KHz 80V Buck DC to DC Converter
https://www.lcsc.com/datasheet/lcsc_d...

Blog with schematic diagram in pdf:
https://mwblog.fr/ldm-367-shahed-136-...

Link to schematic diagram:
https://mwblog.fr/wp-content/uploads/...

The servo is similar to the giant scale servo from Hitec ref HS-1005SGT:
https://hitecrcd.com/products/servos/...