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Messages - starfighter

#1
Guess what folks? I replaced the TDA2050 today and my amplifier is working again! It's a huge win for me. It's almost magical. You replace a piece of silicon and everything is working again.

Thank you all for guiding me through this. You are all awesome.
#2
I took a look around the PCB and everything looks normal (to my untrained eyes). There is a brownish layer on the guitar input plug metal and orange/brown color on the LM317T(see attachment). I am not sure if that is an issues.

I have ordered a few TDA2050 from ebay and am hoping to replace it soon. Hope what will fix my amp.
#3
There is a reference point in the PCB after a LM317T IC that lists 3.3v as the reference voltage. I checked there and I see correct voltage.

I am not sure how to check if TDA2050 is malfunctioning. I want to make sure replacing that's where the problem is at. Do you guys know what I can do to test it?

Also, is LM1875 is a an equivalent replacement for TDA2050. From my limited knowledge, LM1875 seems to output less power? I am fine with that though. What I am interested is in if I replace TDA2050 with LM1875, do I need to change any other parts. Like the resistors or anything else?
#4
Thanks for your response. I will check as soon as I get home.

Do you think I can easily get new ICs? I will try replacing them if I can find them.
#5
I have a Line 6 Spider III amp that makes a very loud humming/buzzing noise when I turn it on. It also does not amplify any input. The amp was working fine until I tried connecting an iPad in the aux-in port.

I want to repair the amp myself but have very little knowledge on how to do so. I am looking for some pointers from you kind people on what to look at first.

So far I have checked the output going into the speakers and it's about 20v (probably DC). I am not sure what to look for next. Please help.