I had an issue with my car radio not playing any music whether CD or FM/AM was selected. I was able to narrow it down to the stock amplifier not working. (I disconnected amp and attached a tiny speaker to the pre-amp feeds and was able to hear music from each channel). I replaced the defective amp with its equivalent from the junk yard, courtesy of E-Bay.
I decided to crack the housing open and see if I could figure out what went wrong - purely academic, right?! I mean we all enjoy a good sleuth around here, no?
I found oxidation on what I assume is the power amplifier board by a 14 pin quad comparator LM2901N - the corrosion was found underneath and what seems to be a burnt out diode?
Should I attempt to replace the diode and IC?
This pict. is directly under the IC - the 'burnt' diode is top right. It looks like it was a red glass barrel type smt diode, similar to the lower one.
Here is a complete shot of the 'power' board
Here is the board that is attached by those thin wire ribbons - I assume it is the audio processing board, as there are 5 IC's and there are 5 channels to this system.
A close up of the above IC is marked Bose.
I decided to crack the housing open and see if I could figure out what went wrong - purely academic, right?! I mean we all enjoy a good sleuth around here, no?
I found oxidation on what I assume is the power amplifier board by a 14 pin quad comparator LM2901N - the corrosion was found underneath and what seems to be a burnt out diode?
Should I attempt to replace the diode and IC?
This pict. is directly under the IC - the 'burnt' diode is top right. It looks like it was a red glass barrel type smt diode, similar to the lower one.
Here is a complete shot of the 'power' board
Here is the board that is attached by those thin wire ribbons - I assume it is the audio processing board, as there are 5 IC's and there are 5 channels to this system.
A close up of the above IC is marked Bose.
