Re: Sony STR-DN1030 Distorted audio when Volume adjusted
I didn't see the "vol" points... so you are probably right about that. To me, it is somewhat "different" for a selector to have volume control / gain in it. Perhaps, its just for muting / unmuting... maybe. Anyway, the suggested check may tell IF the signal is actually getting "inside" ic400 properly as those output pins, regardless of setting should see a "clean signal".
Further, since you know that only FL appears to be an issue, you can narrow some "poke testing" down to that in a few others area. As suggested earlier, in an unpowered/ disconnected unit state, you can do various checks with a meter... along with your eyes (ie. visual) looking for cracked joints / bad soldering. In the case of ic400, ensure that pins associated with FL are indeed connected "well". NOTE: in the page 32, that grounds for what appears to be ALL internals, seem to have seperate pins. Perhaps the ground for FL is not good (depending on the internals of the chip, it may have problems therein)... that can be checked by probe touching on the pin of the chip, not the solder point and referencing it back to some ground point elsewhere. This could tell you about the integrity of the pin contact point. Again, just an example.
Some other checks using a different "route". Input you test signal in the video audio input and look for the result in the rec output side of things (scope or otherwise).... is anything different?
I didn't see the "vol" points... so you are probably right about that. To me, it is somewhat "different" for a selector to have volume control / gain in it. Perhaps, its just for muting / unmuting... maybe. Anyway, the suggested check may tell IF the signal is actually getting "inside" ic400 properly as those output pins, regardless of setting should see a "clean signal".
Further, since you know that only FL appears to be an issue, you can narrow some "poke testing" down to that in a few others area. As suggested earlier, in an unpowered/ disconnected unit state, you can do various checks with a meter... along with your eyes (ie. visual) looking for cracked joints / bad soldering. In the case of ic400, ensure that pins associated with FL are indeed connected "well". NOTE: in the page 32, that grounds for what appears to be ALL internals, seem to have seperate pins. Perhaps the ground for FL is not good (depending on the internals of the chip, it may have problems therein)... that can be checked by probe touching on the pin of the chip, not the solder point and referencing it back to some ground point elsewhere. This could tell you about the integrity of the pin contact point. Again, just an example.
Some other checks using a different "route". Input you test signal in the video audio input and look for the result in the rec output side of things (scope or otherwise).... is anything different?
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