Hello, I recently bought an harman/kardon AVR 255/230 second hand. I set it up, everything worked fine until I was setting up my Fire TV Cube to be able to control it. It tried to send some command where it switched sources (not exactly sure what it was trying to do, maybe it also had something to do with muting the source?) and since then there is no audio.
I have tried:
Anyone have experience with something like this? Any advice on what I should try / test? I have no problem disassembling it and sending photos of things / testing individual components.
In advance thank you for any help.
I have tried:
- using multiple sources (HDMI, digital audio, analong cinch; both back and front panel ones)
- factory resetting it with holding OK button (Tho there is a reset button in the back near the RS323 port, which I don't know how works)
- tested speakers - there is no short
- video out works fine
- there is no error message on the screen (both built in and hdmi out)
- while playing the test tone (speaker level setup) there is noise coming through the speaker at max volume
- noise coming through the phones port while trying to play music at max volume
- at first after the speakers stopped playing the phones port continued to work, however i disassembled it to look for burnt components / bad soldering points / overall loose things (found none)
- I tried testing resistors labeled 0.27ohmKx2 5W KW0807 but was getting weird readings - all were 0.0-0.1ohm across them so I figure I was measuring them wrong
- I tried testing transistors behind them (diode mode on multimeter) got readings: left to middle pin is 0.6v, left to right pin is 0.6v, middle to right pin is 1.2v - this is on the ones I could access (only two of them)
Anyone have experience with something like this? Any advice on what I should try / test? I have no problem disassembling it and sending photos of things / testing individual components.
In advance thank you for any help.