No gain but a high input SWR. Check Q1 for shorts between drain and source.
Between Q1 (drain) and Q2 (final gates):
In the world of multi-port USB charging stations, the has become a popular choice for users looking to consolidate their charging needs. Often branded under names like WLX or YUDU , this 8-port charger is known for its integrated LCD display that shows real-time voltage and current for each connected device.
Before diving into the circuit traces, it is important to note the device's operational parameters. The WLX-896B is designed for versatility and global use. Wlx-896b Schematic
Failed electrolytic capacitors on the secondary side can cause voltage ripples, leading to unstable charging or flickering displays.
The primary side relies on a high-voltage PWM controller/switcher IC alongside a rugged power MOSFET (mounted to a dedicated small heatsink). This transistor chops the high-voltage DC into ultra-high-frequency square waves running at tens of kilohertz, allowing a compact transformer to efficiently step down the power. 2. Isolation and Feedback Loop
The device is entirely unresponsive when plugged into AC power. No gain but a high input SWR
Integrated LED/LCD screen for independent real-time current and voltage monitoring per port. Circuit Overview and Internal Components
Since "WLX-896B" most commonly refers to a generic (often a clone or variant of the popular 936/908 style stations), the following review is drafted based on the technical architecture typically found in these devices.
Isolates a sub-circuit driven by an independent protocol IC. Multi-channel Sequential LCD Driven by MCU polling individual inline low-side shunts. Troubleshooting Common Faults Using the Schematic Often branded under names like WLX or YUDU
Most components match available datasheets, but [specific IC or transistor] pinout seems inconsistent with manufacturer documentation.
If you are using this information for repair, focus on these high-failure points: Likely Culprit Blown Fuse or Primary MOSFET Check input fuse and power transistor for shorts. Flickering / Cycling Dried-out Electrolytic Caps Look for bulging capacitors on the secondary side. One Port Not Working Physical USB Port Damage Inspect the internal pins of the USB-A female socket. Low Voltage Output Feedback Loop Failure Test the TL431 and Optocoupler . ⚠️ Safety Warning
: This chip drives a high-voltage MOSFET to pulse the primary winding of the flyback transformer at high frequencies (typically 65kHz–100kHz).