Kenwood KDC 3051G Car Radio permanently stuck in Demo Mode please help

[Omron]

Hello Guys! I have trouble with my car radio Kenwood KDC 3051G I hope someone more knowledgeable can help me, I tried everything in my power that I stumbled upon online.

My radio is permanently in demo mode, it says Press Volume Knot Cancel Demo and when I press it nothing happens.

- Tried to unplug radio and plug it back in into power,

- Tried to reset radio by holding reset button key for 5,10,30 seconds while in power and without power, plugging it back in, it wouldn't work.

- Tried to hold 3,6 while turning it back on and then pressing 1,2 , nothing happened still in demo mode asking to press volume knot.

- I opened front radio panel and cleaned all contact with alcohol brush, still same. I sprayed WD Spray onto volume knot button while its opened still same.

- I retouched soldering points of volume knot button if it had cold connection to resolder it back on, still it doesn't work,

- Tried resoldering other buttons too, in case some was stuck or something it didn't improve at all.. Still asking me to press volume knot button.


Anyone has any idea what can I do? Tried other radio, it works perfectly so its not my installation. Thank you everyone for reading this and specially to those who are willing to help me out! 😊

[Omron]

Looked into buttons today, buttons on side have 4 pins each, two are parallel in continuity and two across should be only in continuity when button is pressed. They have around 1200mOhm resistance and when pressed 0 resistance.
Found out the power button was basically always pressed in permanently, thus nothing was working correctly. What I did was cut small rubber tube and put it onto button, then spray with WD and with small screwdriver started to click it so WD ingredients go inside button and lube it up and clean it up.
After doing this for 20-30 seconds I checked with Multimeter and it was working like charm, not even needed to de-solder - solder new one, saved me a lot of time and hustle especially since i didn't have spare button.

Below I will put links that helped me so people who have same trouble can help themselves as well
FM radio diagnosis and repair:
https://www.youtube.com/watch?v=LsM5qRLHH2Q

Button repair:
https://www.youtube.com/watch?v=Bb90lXgp3MI

[CapLeaker]

I think you have to press the function button first, before you press the volume

[R_J]

See Page 6

[Omron]

It doesn't respond to any buttons, Before it worked now not anymore

[Omron]

Additional info, not even power button is reponding when you want to turn it off

[Omron]

https://www.youtube.com/watch?v=LsM5qRLHH2Q I found this video basically person is looking if some button is not working and he finds one and takes it out and then it starts working, I need to check this out tomorrow on my unit

[Omron]

Looked into buttons today, buttons on side have 4 pins each, two are parallel in continuity and two across should be only in continuity when button is pressed. They have around 1200mOhm resistance and when pressed 0 resistance.
Found out the power button was basically always pressed in permanently, thus nothing was working correctly. What I did was cut small rubber tube and put it onto button, then spray with WD and with small screwdriver started to click it so WD ingredients go inside button and lube it up and clean it up.
After doing this for 20-30 seconds I checked with Multimeter and it was working like charm, not even needed to de-solder - solder new one, saved me a lot of time and hustle especially since i didn't have spare button.

Below I will put links that helped me so people who have same trouble can help themselves as well
FM radio diagnosis and repair:
https://www.youtube.com/watch?v=LsM5qRLHH2Q

Button repair:
https://www.youtube.com/watch?v=Bb90lXgp3MI