Kz12033a1 May 2026

(Revision 1.0) is a specific internal power supply and LED driver board primarily used in HQ-LED 19.5" monitors

Use a multimeter to ensure capacitors are discharged before touching the board. kz12033a1

Component Type: Switch Mode Power Supply (SMPS) / Internal Power Board (Revision 1

| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | No output, PG pin low | Short circuit at output, or EN pin not pulled high | Check load impedance; pull EN to VIN via 100kΩ resistor | | Excessive ripple voltage | Output capacitor too small or too high ESR | Increase ceramic capacitance; remove tantalum caps | | Thermal shutdown after 2 seconds | Insufficient thermal vias or excessive output current | Re-layout PCB for better airflow; reduce load to 12A | | Whistling / audible noise | Low load current (<100mA) in DCM mode | Add minimal load resistor (e.g., 100Ω to 150Ω) | Input Current: 1

Safety: The board uses passive heat dissipation and is typically mounted internally.

Input Voltage: AC 100-254V, 47-63Hz (Bivolt/Universal input). Input Current: 1.0A. Output Power: 30W. Output Voltage: Main Power: 12V - 3.0A. Backlight Power: 9V - 600mA x 2 (Double Backlight Output). Input Current: 1.0A. Board References: 94VD T=1.6 10Z. Key Features