Hi all,
I wonder if i can ask for some advice please.
I purchased a Sony MEX-BT3900U radio,it was second hand from a friend but ive seen it working many times etc.
Last night i connected it to a small power supply that i have in the garage as i wanted to just see what it looked like in the dark,strange i know,i worked fine no problem.
This morning i pulled out the old radio from my car & using the same wiring it fitted as standard no problem.
I got a whir at start up,it then lit up blue & started to display logos etc etc like it should.
I put a cud in the drive & listened whilst i was fitting its new security cage.
then the unit stopped ?
Pressing on/off source button did nothing.
I wiggled the wires a little but no loose connection etc.
I removed the unit from the car.
I then check the following of which were all present.
12v constant supply
12v switched 12v supply
Earth.
10amp fuse was ok but replaced with new anyway.
I connected the radio again but nothing.
I noticed that if i press the cd eject button then it ejects fine.
If i push the cd then its taken back in but doesnt spin etc,still no display at this stage.
Removed this unit & plugged the original unit back in & working fine.
I then connected it back up to the power supply in the garage but nothing.
I also removed the front panel which doesnt go beep beep when ignition switched off and panel left on.
I pressed and held the reset button for say 3 seconds.
All this made no difference.
Is there an internal fuse etc ?
Any advice as i cant see how i was listening to the cd etc no problem then nothing.
Thanks very much.
I wonder if i can ask for some advice please.
I purchased a Sony MEX-BT3900U radio,it was second hand from a friend but ive seen it working many times etc.
Last night i connected it to a small power supply that i have in the garage as i wanted to just see what it looked like in the dark,strange i know,i worked fine no problem.
This morning i pulled out the old radio from my car & using the same wiring it fitted as standard no problem.
I got a whir at start up,it then lit up blue & started to display logos etc etc like it should.
I put a cud in the drive & listened whilst i was fitting its new security cage.
then the unit stopped ?
Pressing on/off source button did nothing.
I wiggled the wires a little but no loose connection etc.
I removed the unit from the car.
I then check the following of which were all present.
12v constant supply
12v switched 12v supply
Earth.
10amp fuse was ok but replaced with new anyway.
I connected the radio again but nothing.
I noticed that if i press the cd eject button then it ejects fine.
If i push the cd then its taken back in but doesnt spin etc,still no display at this stage.
Removed this unit & plugged the original unit back in & working fine.
I then connected it back up to the power supply in the garage but nothing.
I also removed the front panel which doesnt go beep beep when ignition switched off and panel left on.
I pressed and held the reset button for say 3 seconds.
All this made no difference.
Is there an internal fuse etc ?
Any advice as i cant see how i was listening to the cd etc no problem then nothing.
Thanks very much.
Sometimes the contacts on the face get dirty and the head unit thinks the face is off and won't power up.
Have you probed the wires inside the harness connector to make sure that you don't have a broken wire?
Have you probed the wires inside the harness connector to make sure that you don't have a broken wire?
Hi,
I have the same issue with using the wiring harness/plug on the car as i do inside with another harness that i have.
I have just done a reset but no joy.
I have pressed the reset but on/off and then for say 3 seconds but no joy.
There is no lights at all.
There is no beep beep to tell you that you need to take head unit off.
I can put a cd into it no problem but will not play,i can also eject it etc.
Can the firmware be rewritten up updated if thats the cause but im stumped as i was in the car with a cd playing at the time.
I switched it off to fit the cage but then nothing since.
I am 100% wiring on car is ok as the radio i put back in is running fine as we speak.
I have the same issue with using the wiring harness/plug on the car as i do inside with another harness that i have.
I have just done a reset but no joy.
I have pressed the reset but on/off and then for say 3 seconds but no joy.
There is no lights at all.
There is no beep beep to tell you that you need to take head unit off.
I can put a cd into it no problem but will not play,i can also eject it etc.
Can the firmware be rewritten up updated if thats the cause but im stumped as i was in the car with a cd playing at the time.
I switched it off to fit the cage but then nothing since.
I am 100% wiring on car is ok as the radio i put back in is running fine as we speak.
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