Hello, in August 2016 I bought Adjustable Buck Voltage Converter Stabilizer 6-32V to 1.25-32V with LCD.

The output voltage the LCD reports is incorrect. Output voltage always reads 15.4V (+/- 0.2V). I used my volt meter and the “ADJ-V” adjustment to change the real output voltage from 1.5V-5.5V. Volt meter confirms the voltage is adjusted as expected. But the LCD reading never changes from 15V!

The input voltage it reads is correct (in this case 12.4V), I have confirmed with my volt meter.

It seems that calibration only works for INPUT voltage and not OUTPUT voltage. How can I fix this to read the correct output voltage?