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TS-450S AUDIO REPAIR

Kenwood TS-450S Dead Audio Repair. May 2022


Symptom: Complete and total loss of audio.

The radio was purchased after a quick power up test that produced healthy loud white noise and all displays lite up, however when the radio was powered up back at home the audio was dead. While all displays appeared to working well the S meter was showing full deflection.

 

While using a sniffer amplifier to probe the input pin 1 at IC5 (uPC2002v audio amplifier chip) it was noticed that there was goo around the base of electrolytic capacitor C104.    

 

C104 a 470uF electrolytic capacitor had catastrophically failed blowing the capacitorís electrolyte material out the bottom of the capacitor and onto the PC board. The C104 capacitor was replaced and all the electrolyte material was cleaned from the board which had reacted with green PCB mask causing the mask to be completely deteriorated from the area under the capacitor and leaving exposed copper after cleaning. 

 

There is reasonable concern that the electrolyte material would have ultimately corroded the copper PCB tracks.

With C104 replaced and all the electrolyte material cleaned, related electrolytic capacitors C99 and C101 were also replace as a mater of opportunistic preventive maintenance while the board was out..

 

Radio was powered up and worked perfectly.

 


Video of the Kenwood TS-450S Repair.

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Page last revised 24 June, 2022
 

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