Troubleshooting a dead Onkyo TX-SV727 Receiver - Pwr Supply

[electronic repair]

Hello,

I've tried searching this group and looking for relevant information
but nothing really related to the basic troubleshooting I'm doing for
my dead Onkyo TX-SV727 Receiver.

<i>BACKSTORY</i> The electricity in my house is pretty janky and my
stereo may have been shorted out because of that. Basically, my wife
was listening to music when something happend and she saw the words
"Protect" come on the display.

<b>TROUBLESHOOTING STEPS TAKEN</b>
I checked the speaker wires and they had no damage (so that didn't
short it out). I tried replacing the fuse with several different
ones.
The stereo came with a T 6,3A 125V Fuse, but I could not find that
specific one in any of the shops here in Portland. I've tried 6A at
125V and also 5A at 220V but they all blow within seconds.
I've also inspected the power supply and there are no obvious scorch
marks or soder marks that look shorted out.

Please help me figure out what to do next.

Thanks!

 

[Ken]

electronic repair wrote:

Hello,

I've tried searching this group and looking for relevant information
but nothing really related to the basic troubleshooting I'm doing for
my dead Onkyo TX-SV727 Receiver.

i&gt;BACKSTORY</i> The electricity in my house is pretty janky and my
stereo may have been shorted out because of that. Basically, my wife
was listening to music when something happend and she saw the words
"Protect" come on the display.

b&gt;TROUBLESHOOTING STEPS TAKEN&lt;/b
I checked the speaker wires and they had no damage (so that didn't
short it out). I tried replacing the fuse with several different
ones.
The stereo came with a T 6,3A 125V Fuse, but I could not find that
specific one in any of the shops here in Portland. I've tried 6A at
125V and also 5A at 220V but they all blow within seconds.
I've also inspected the power supply and there are no obvious scorch
marks or soder marks that look shorted out.

Please help me figure out what to do next.

Thanks!

Now that you have tried a few things to see if you can see something
wrong, I would suggest you take it to someone who understands something
about electronics. Based upon your text above, I get the feeling you
would not be able to replace the faulty component even if it were
identified for you. This is NOT meant to be a slam, but advice that
might save you some money in the long run.

 

[Arfa Daily]

"Ken" &lt;Ken@invalid.com&gt; wrote in message
news:i60oh6$p6u$1@news.eternal-september.org...

electronic repair wrote:
Hello,

I've tried searching this group and looking for relevant information
but nothing really related to the basic troubleshooting I'm doing for
my dead Onkyo TX-SV727 Receiver.

i&gt;BACKSTORY</i> The electricity in my house is pretty janky and my
stereo may have been shorted out because of that. Basically, my wife
was listening to music when something happend and she saw the words
"Protect" come on the display.

b&gt;TROUBLESHOOTING STEPS TAKEN&lt;/b
I checked the speaker wires and they had no damage (so that didn't
short it out). I tried replacing the fuse with several different
ones.
The stereo came with a T 6,3A 125V Fuse, but I could not find that
specific one in any of the shops here in Portland. I've tried 6A at
125V and also 5A at 220V but they all blow within seconds.
I've also inspected the power supply and there are no obvious scorch
marks or soder marks that look shorted out.

Please help me figure out what to do next.

Thanks!


Now that you have tried a few things to see if you can see something
wrong, I would suggest you take it to someone who understands something
about electronics. Based upon your text above, I get the feeling you
would not be able to replace the faulty component even if it were
identified for you. This is NOT meant to be a slam, but advice that might
save you some money in the long run.

Seconded. This is almost certainly an output stage failure, and in a DC
coupled amp such as this, may well be cascade in nature. These are
potentially tricky for the best of us, and a set of schematics, and the
ability to understand them in detail, is certainly required to even begin to
tackle this sort of problem. Depending on where exactly in the circuit the
fuse that's blowing is located, there is a slim possibility that it could
still be something simple in the power supply such as the bridge reccy, but
if you do not have experience of detailed fault location to component level,
I would agree with the good advice given by Ken, and consider taking it to a
reputable repair shop.

Arfa

 

[Meat Plow]

On Sun, 05 Sep 2010 11:10:36 -0700, electronic repair wrote:

Hello,

I've tried searching this group and looking for relevant information but
nothing really related to the basic troubleshooting I'm doing for my
dead Onkyo TX-SV727 Receiver.

i&gt;BACKSTORY</i> The electricity in my house is pretty janky and my
stereo may have been shorted out because of that. Basically, my wife
was listening to music when something happend and she saw the words
"Protect" come on the display.

b&gt;TROUBLESHOOTING STEPS TAKEN&lt;/b
I checked the speaker wires and they had no damage (so that didn't short
it out). I tried replacing the fuse with several different ones.
The stereo came with a T 6,3A 125V Fuse, but I could not find that
specific one in any of the shops here in Portland. I've tried 6A at
125V and also 5A at 220V but they all blow within seconds. I've also
inspected the power supply and there are no obvious scorch marks or
soder marks that look shorted out.

Please help me figure out what to do next.

Thanks!

Problem with the amplifier is usually suspect if no blown fuses and you
get a Protect warning. Unless you have explicit experience in repairing
consumer audio electronics I strongly recommend you take the unit to a
qualified repair facility.




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