SX-950 phono issues

[Islander21]

Today my SX-950 started making some serious static noise on both phono inputs, whether the TT was connected or not. It sounds fine in AUX and on AM/FM. On stereo mode the left channel is clean with good sound, the right channel is very staticky with no sound. In mono mode the left channel becomes staticky as well but not as bad as the right channel which behaves exactly as in stereo mode. I swapped in my SX-850 in and it works fine, so it's not the speakers, cables, the Kenwood KD-750 turntable or the equalizer. I cleaned all the switches thoroughly DeoxIT, did I screw something up or perhaps did my phono board just take a dump?

 

[mbz]

Don't know the unit

Symptoms read like faulty silicon in right channel phono stage.
Schematic shows 2SA725 and 2SC1313 used. Both of these are considered problematic (shoot on sight?)
If you have the skills then replace, maybe KSA992 and KSC1845?

 

[Islander21]

Thanks for the reply, MBZ. I do have are a very particular set of skills. Skills I acquired over a very short USAF career. Skills that make me a nightmare... er, never mind. Should I consider doing a full phono board recap/repair? The recap kit I'm looking at has at least 4 transistors in the phono stage baggy. I acquired this unit recently and the seller provided a repair invoice from 2024, I see that that the tech replaced 4 signal transistors and two electrolytic caps in the phono EQ circuit (no details, though). Might that be a hint?