WAS working fine but seems lost part of listening frequency (IC Burnt??) Help
About a month ago had a small smell of burnt electronics and thought it was from the new TV I bought, but nothing was wrong. Yesterday heard my power regulator for the computer complaining (beeping) as if either I got a huge voltage spike in my electricity (or maybe something shorted somewhere) but the lights or circuit breaker of the house did not go out. Then at night went to listen to receiver and I notice the it was working partially. This is, everything works, sound through all channels, etc BUT it has lost VOLUME this is when volume at 35 out of 60, it sounds like 10 out of 60. Also it lost definition, the sub for example seems to have frequency missing. Could it be that some audio/output amplifier IC burnt? How many IC amplifier does this unit have? If one burnt would the symptom be as describe above? Am I in the right direction to what is my receiver problem? Any help would be appreciated. Thanks
Re: WAS working fine but seems lost part of listening...
I had a similar problem with popping and then no audio for an extended period of time. I found the solution on another site, http://dexsoft.com/blog/?p=15
Apparently the solder joints are weak, and just a the blog described when I opened up the receiver I saw the same scorch marks from overheating. Just as the blog described, I added solder to each of the joints in the photo and have had no problem ever since.
I am no solder expert, this is my 2nd time, but all I did is build up each of the joints and I have been listening to music, playing movies in surround sound with no problems for the last 2 weeks.
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Apart from the fuses what you have mentioned there could be small Relay to prevent both thermal as well power related problems apart from that the DSP and its support circuitry could have conked off . look for small PCB mount chip fuses near and around the DSP and a discrete Micro if it is present
well there may be a simple solution, it could quite possibly be a fuse... if you open it up, after the power converter box and before it hits electronics, ther should be a fuse, this may be burnt out... but check inside before you go to buy a bunch of fuses as there are normally a couple spares inside, and if not, its easier to find the right replacement with the burnt out one in your hand!
unplug everything that is pluged into the reciever. plug the power cord into an outlet with nothing else pluged into it and try it again. if your electronically experienced you could try to ground it and carefully try it again. give the unit a smell, does it smell a little burnt? if you have a screw driver and a little trust in yourself tale the cover off and look at the board for visual burn marks there should be fuses inside the unit, you could check those out. If you dont see anything visually wrong and it is still not powering it would be a good idea to bring it in to an electronics repair shop and they could diagnose the problem. With the use of a volt ohm meter it would not take long.
I know that a couple of you have had the same problem with the blowing 0.47 ohm resistors. I had responded quite a wile back, but forgot to make any updates. Kostiko is correct about the problem relating to these two 0.47 ohm resistors being blown. In my case on two different Haman Kardon models, this was true, but there could also be another issue. What i have found is even after replacing these resistors, the problem appeared to still be there. What was happening was that right after turning the receiver on, the resistors would blow again. What you need to do is replace the two small ceramic disc style capacitors on the same pcb as the fusible resistors, as they could be shorted as in my case. You could remove these capacitors completely, or replace them with a similar size of the same type, as they are really just there for filtering higher frequency noises from the power supply. You can check them with your multimeter first. They shouldn't shorted even in situe. I forget the size, but they are approximately 100 nano farads. Good luck. I have done this to my AVR135, and it has been running great for about 6 months now.
You have a bad power supply or the audio output circuit has a short in it. You are correct by saying its probably betterv off getting a new unit. Most likly cost you more then a brand new shiny unit would . Good Luck
PS Please do not forget to rate this thread