Lenovo Thinkpad Ultra Dock AJ40 Disassembly

ID: 145498

Description:

Steps:

  1. Docking via 3 pcs. connectors sliding sideways into the laptop.
  2. Power connector used is the square type.
  3. Keep track of where the screws are located, because there are many.
  4. Be careful on disassembly. The dock is partly mechanical, and it relies on springs and flexing of mechanical parts to function.
    5. Step image
  5. Check if the firmware is updated. In this case, the repair may not be needed. The dock needs to be powered and laptop docked when running the update tool.
  6. Firmware update tool : Firmware for ThinkPad Ultra/Pro/Basic Docking Station V3.3.1
  7. https://pcsupport.lenovo.com/dk/da/produ...
    8. Step image
  8. Remove the 8 bottom screws circled in red.
    9. Step image
  9. Remove the 5 screws circled in red from the side of the dock.
    10. Step image
  10. Use plastic picks or a metal spudger to pry off the top left corner of the shown cover. Remove the hidden screw.
  11. Lock engaged (LED on). The switch is located inside the button assembly.(when the slider is moved right).
  12. Laptop connected/detected: LED on.
  13. Screw for removing the key-lock. No need for removal if the whole button assembly is to be removed together.
    14. Step image Step image
  14. Hidden screw under the ThinkPad logo.
  15. I recommend peeling off only part of the logo as needed so reassembly of the logo is easy.
    16. Step image
  16. Pry off the bezel around the key-lock. Remove the screw that connects the button assembly and the bottom assembly.
    17. Step image
  17. Use plastic picks or a metal spudger to pry off the top covers of the two screws on the top side.
    18. Step image
  18. Button assembly separated. The docking connectors are visible.
    19. Step image
  19. PCB top side
  20. Red boxes : Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs. Texas instruments: TPS51225
  21. Left step down produce 5V
  22. Right step down: produce 3V3 and 5V
  23. There are three Eeprom on board : winbond: 25x10CLNIG , 8 pin, U4 and U10 (1M-bit SPI)
  24. VLI marked IC: Via labs Usb port controllers VL820. https://www.via-labs.com/product_show.ph...
  25. Synaptics VMM5322.Have features for HDMI and 2xDisplay port out.
    26. Step image
  26. PCB bottom side
  27. Red boxes : usb-c controller ICs. Via Labs inc, : VP225 - USB Type-C DFP CC Controller
  28. Blue box: 2 pcs. cypress CYP3123 USB type C port controller. https://www.cypress.com/part/cypd3123-40...
  29. Red arows: 20V path to the laptop usb-c charge power.
    30. Step image
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