Finding diode and repairing nissan car radio

[Edumcg]

Hello,

I'm trying to repair my nissan car radio model: Clarion BTS33

The problem began when the fuel volumen line of my car shortcircuited with 12V.  As soon as that happened my radio turned off and never came back again. I sent the radio with some folks to repair it, they replaced some ICs that were burned out but they couldn't replace one specific diode.

Right now, when I plug the radio into my car only the screen shows up but it prints nothing. Just a blank orange screen. No audio output no matter what buttons I press.

I found the cable on Amazon: https://www.amazon.com/20-pin-Subaru-Headunit-Harness-Steering/dp/B01D9K3L44

I also found the user manual of the radio: https://fccid.io/2ABGYBTS33-CLARION/User-Manual/User-guide-2150158

The only component that looks burned out is the diode D402. The diode is the same as de diode D403 so I can see the marking is "C308" the 08 is fllipped to the right 90 degress.

My plan is to replace the diode but I haven't been able to find a datasheet.

I've attached images of the radio and the circuit board. Any help would be appreciated.

Thanks!

[coromonadalix]

first i would measure the d403 part in diode mode to see if you have only 2 pins used  : like cathode anode, test it forward and reverse  to see if you have a junction voltage and nothing in the reverse,  that way youll find anode and cathode on the 3 pins,   but if its an transisor you'll find a common point who'll give you 2 junctions voltages and nothing in reverse

normal or reverse mean changing the red and black tip when you measure things ...

you can google   transistor and diode checkup ...

Since its marked "dxxx"  it should be an diode like in4148  in sot-23 package

I see you posted here too
https://www.element14.com/community/thread/75454/l/diode-identification-and-car-radio-repair

[Manul]

My bet would be 1SS226.

[coromonadalix]

possible  only a diode test will tell  if the op is able to do so