I need to repair a sub of mine that suddenly developed issues. First started with a popping/crackling sound with no output. I took amp apart and testing all major components with no findings so I reinstalled. Amp worked but only tested at low volume for a minute or two. So I added the rest of the bolts to the amp and was going to do further testing. Turned amp back on and since then it only makes a VERY loud hum in the 60-120hz range as soon as power is applied.
I removed all 6 of the filter caps and they test at 950uf (rated at 820uf). I charged them with my diode tester and they hold a small charge, etc. The just seem good to me... I diode checked the bridge and it tests good but not sure if I should apply power to it for a proper test?
The circled component is what I found the other night that was certainly failed either from a poor solder or heat. The OEM identifies this issue as the popping I would hear but should not cause the hum. I am wondering if the resistor problem could have hurt something else? I am certainly missing something here.
I did remove a couple mosfets for bench testing and they are fine so far. I usually look for dead shorts on mosfets but being told this noise is likely in the PS and not the transistor side. Not really sure.
Any experienced help would be appreciated...
I removed all 6 of the filter caps and they test at 950uf (rated at 820uf). I charged them with my diode tester and they hold a small charge, etc. The just seem good to me... I diode checked the bridge and it tests good but not sure if I should apply power to it for a proper test?
The circled component is what I found the other night that was certainly failed either from a poor solder or heat. The OEM identifies this issue as the popping I would hear but should not cause the hum. I am wondering if the resistor problem could have hurt something else? I am certainly missing something here.
I did remove a couple mosfets for bench testing and they are fine so far. I usually look for dead shorts on mosfets but being told this noise is likely in the PS and not the transistor side. Not really sure.
Any experienced help would be appreciated...