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Introduction
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Last year, we took apart the Lenovo Legion 135W or C135 USB-C GaN charger. Today, we got its upgraded version, the 140W or C140.
Compared with the previous 135W charger, the compatibility has been greatly improved. It can support 28V5A PD3.1 protocol and 20V7A 140W Lenovo’s proprietary protocol.
Let's take it apart to see what it looks like inside.

Bill of materials (BOM)
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Model: LA140
Input Time-delay Fuse: CONQUER
Safety X2 Capacitor: Surong
Bridge Rectifier: Yangjie GBU2510
SMD Y Capacitor: Holy Stone
PFC Boost Controller: JoulWatt JW1572
GaN FET (PFC Boost): GaNext G1N65R150PB-N
PFC Boost Rectifier: ER1060S
Electrolytic Capacitor: Chengxing
AHB Controller: JoulWatt JW1556B
GaN FET (AHB Topology): GaNext G1N65R240PB
GaN FET Driver: ON Semiconductor NCP51530B
Power Supply Capacitor: Su’scon
SMD Y Capacitor: Holy Stone
Optocoupler: CT1018
Synchronous Rectification Controller: JoulWatt JW7726BL
Synchronous Rectifier: SP150N095
Solid Capacitor: PolyCap
Protocol Chip: Weltrend WT6676F
Output VBUS MOSFET: NCE Power NCEP40T15GU

Related Articles：
1. PD3.1 Support | Lenovo Launched Legion C140 GaN Adapter
2. Teardown of Lenovo Legion 135W/C135 USB-C GaN Charger
3. Teardown of Lenovo ThinkPad Stack Power Bank (Modular Design)