attempting to repair it I rubbed the pad off of the tl074 pin 2 inverted input on the second board. Where can I tap into to get the signal? Is it even used thanks
I don't have anything, specifically, on this amp but having terminals connected to resistors indicates that this section of the 074 is used.
ChipQuik is your friend if you're not good with SMD components. There is a bit of a learning curve with it but it has saved a lot of boards.
You may have to remove the IC to see where the trace goes.
If no audio and you bridge terminals 1 and 2, does that change anything?
ChipQuik is your friend if you're not good with SMD components. There is a bit of a learning curve with it but it has saved a lot of boards.
You may have to remove the IC to see where the trace goes.
If no audio and you bridge terminals 1 and 2, does that change anything?
I looked don’t see anything, looks like it was just a pad. And I’m getting audio. Not sure if it’s both amps or something wrong. Didn’t wanna turn it up and blow something.
Do you have an audio output from each board?
Is the other board so different in its layout that you cannot use it to determine the circuit connections?
Is the other board so different in its layout that you cannot use it to determine the circuit connections?
I just tested the one on the amp. Not sure where to get the signal just from the second amp. And on the main amp pin 2 goes through a capacitor a couple resistors and to pin 10 on the 074c. The second amp doesn’t have any of that
That's why I asked if you had audio from both boards. The amp would produce audio if you have only one with audio and other acting like a ground.
How would I test the second board alone for audio? Sine wave on the outputs? It doesn’t have its own speaker output
There are large red wires that go into the board near the output inductors. Probe that wire near the inductor. Do both have the same signal?
If you have the same audio on both of those wires at the same level on both and it produces audio into a speaker, it would appear the amplifier section is working in both boards.