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Diode identification and car radio repair

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!

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  • image

    I don't wish to rain on your repair parade but, I question the suggestion the component D402 (A) is a diode. Diodes typically have two leads and not three leads as D402 has. D401 (B) could be a diode and ZD402 (B) could be a zenor diode (guessing because of the prefix Z). This two component have two leads. D304 & D303 (C) are diodes according to the symbol. Component D305 (D) might be a diode. It is fairly large and just two leads.

     

    There are transistors, I suspect the components prefixed with a Q,  that typically have three leads. D402 having three leads causes me to question if in fact the components is a diode. Maybe someone with SMD experience can chime in on the call.

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  • image

    I don't wish to rain on your repair parade but, I question the suggestion the component D402 (A) is a diode. Diodes typically have two leads and not three leads as D402 has. D401 (B) could be a diode and ZD402 (B) could be a zenor diode (guessing because of the prefix Z). This two component have two leads. D304 & D303 (C) are diodes according to the symbol. Component D305 (D) might be a diode. It is fairly large and just two leads.

     

    There are transistors, I suspect the components prefixed with a Q,  that typically have three leads. D402 having three leads causes me to question if in fact the components is a diode. Maybe someone with SMD experience can chime in on the call.

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