I recently bought audio analyser kit (K8098 - code for the kit) at my local electronics store. When i assembled the unit i looked at the LCD screen and the only thing i could see was white backlight and nothing else. At first i though the PIC micro controller wasn’t programmed so i took my oscilloscope to see if the micro controller is working or not. Some pins were sending out signals. Then i took my home made elektrosluch and i pointed towards the PIC micro controller and at the lower part of the IC i could hear some activity and when i pressed the button a stream of buzzing sounds started to appear. Afterwards i pointed elektrosluch towards the other IC and i coulnd’t hear any sounds coming from it.
I also used my multimeter to check for shorts at pins that connect LCD to the main board and i got no shorts there. So i proceeded to check for shorts at the LCD panel and also got no shorts there.
I even used arduino touchscreen shield from velleman to connect it to the main board and i got the same result. Backlight is on but no text is displayed.
I made a youtube video to show that the unit isn’t working correctly.
Here is the link: https://www.youtube.com/watch?v=t_6TiDRChNw
In conclusion, there is nothing on the LCD screen and the only thing i see is white backlight. Also i forgot to mention that the voltage regulator gets a bit warm after some time.