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• The Lenovo ThinkPad 45 W AC-adapter ADLX45NLC3A uses Lenovo’s proprietary yellow Slim-Tip (rectangular) plug, not USB-C.
• The plug has three electrical nodes:
– Upper‐inner wide blade = +20 V (red/white wire)
– Lower‐inner wide blade + outer metal shell = GND (black wire + shield)
– Central pin = ID/SENSE (thin blue/green wire, ≈260 Ω to GND)
Mechanical & electrical layout
Front view – charger plug (male)
┌─────────────────────────┐
+20 V → │ Wide blade (top) │
│ │
ID → │ • centre pin │
│ │
GND → │ Wide blade (bottom) │
└─────────────────────────┘
Outer metal shroud = GND• Nominal output: 20 V DC ±5 %, 2.25 A (45 W)
• Cable: 3 conductors inside overall braid.
– 18–20 AWG power core (+20 V)
– 18–20 AWG braid/drain (GND)
– 28–30 AWG ID lead in inner jacket
ID/SENSE resistor logic
• Inside the over-moulded plug an SMD resistor bridges ID → GND.
• Value identifies the adapter’s power class:
| Adapter rating | R(ID-GND) typical | Tolerance band |
|---|---|---|
| 45 W (ADLX45NLC3A) | ≈260 Ω | 250–275 Ω |
| 65 W | ≈550 Ω | 520–580 Ω |
| 90 W | ≈1 kΩ | 0.9–1.1 kΩ |
• Laptop EC measures resistance (at ~3.3 V pull-up).
• Open-circuit or wrong value = battery not charged or CPU throttled.
Verifying the adapter
Test-points (multimeter):
a) Voltage (live): black probe on shell, red probe on top blade → 19–20.5 V DC.
b) Resistance (mains unplugged): probes between centre pin and shell → 250–275 Ω.
Abnormal readings indicate broken conductor or burnt resistor, often at cable strain-relief.
Common failure modes
• Fractured ID wire → “Plugged in, not charging / 45 W adapter not detected”.
• Intermittent +20 V due to internal break in power core.
• Melted solder joint on resistor after over-current event.
• Since ~2019 Lenovo has been phasing-in USB-C PD (20 V at 45 W) on new ThinkPads; legacy Slim-Tip persists on T-series made before that date.
• Third-party “combo” adapters now ship with USB-C plus a Slim-Tip dongle that reproduces the 260 Ω ID resistor.
• USB-C PD rev-3.1 (EPR up to 240 W) will ultimately replace Slim-Tip in future models.
• Analogy: The ID resistor acts as a “barcode”; laptop looks at its value to decide how many “amps” it may safely draw.
• For bench supplies: set 20 V, wire + to top blade, – to shell, add 270 Ω resistor between centre pin and shell.
• Shield continuity is required for EMI compliance; keep braid soldered to plug shell.
• Use safety-certified replacement adapters (IEC/UL 62368-1). Sub-standard bricks are a fire hazard.
• Slim-Tip mechanical design is covered by Lenovo trademarks; clone production for sale may infringe IP.
• Dispose of damaged Li-ion chargers in accordance with local e-waste regulations.
• Re-cabling: maintain original conductor cross-section; crimp or solder then epoxy-pot the joint for strain relief.
• After repair, always run both multimeter tests under load (connect a 10 Ω / 50 W resistor or the laptop).
• Keep ferrite bead near adapter end to preserve EMI performance.
• Some 11e/Edge units shipped with identical-looking 65 W adapters—verify FRU/FRN before ordering spares.
• A few counterfeit bricks omit the ID resistor and instead short ID to +20 V; these can damage the motherboard.
• Consult Lenovo HW Maintenance Manual for your exact ThinkPad to see the Slim-Tip jack schematic.
• Study USB-C PD-EPR as the natural migration path (>100 W) for future workstation-class ThinkPads.
• Review IEEE-802.11bz EMC couplings; adapter ground integrity affects RF performance.
The ADLX45NLC3A is a 20 V/2.25 A 45 W adapter that terminates in Lenovo’s yellow Slim-Tip plug. Inside the plug: top plate = +20 V, bottom plate + shell = GND, centre pin = ID (≈260 Ω to GND). Integrity of the ID path is essential; losing it stops battery charging even if 20 V is present. Testing involves checking for 20 V output and ≈260 Ω between ID and GND. When re-cabling replicate the three-wire scheme and the resistor precisely.