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Topic: sony str-dg500 (Read 7498 times) previous topic - next topic
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sony str-dg500

Sony STR-DG500

I have the above named reciever and It has worked well but today while watching a movie the word "Protect" came up and the reciever shut off . I gather it means something has overloaded or overheated or whatever . I cannot find anything in the manuel or on a website to tell me what this means. I would like to know before I take it to a repair shop to give the tech guys a little heads up before tearing it apart. I would also like to know if this is a terminal thing then because it is a bottom of the line machine should I be buying another one or is there a better machine in the same category.
thanks for any help you can give me

sony str-dg500

Reply #1 –
Someone else had the same thing happen on his Sony receiver.  Here's what the response was:

http://en.allexperts.com/q/TV-VCR-Stereo-1...-SE501-says.htm

Quote
The protect indication means the amplifier is overloading and has gone into protect mode.  This is a power management circuit that has detected excessive current or power consumption in the output stages.  The could be caused by a short on the speaker line, a shorted woofer in one of the speakers or dried out silicon grease on the insulating washer of the output transistor (which happens frequently in old amplfiers).  You will burn out the output transistors if you keep pushing the amp. You really should get it fixed.

sony str-dg500

Reply #2 –
Quote from: gordie99 on
because it is a bottom of the line machine should I be buying another one or is there a better machine in the same category.

I have a Sony STR-DA50ES (Elevated Standard) receiver. This was a somewhat high-end receiver back in 1998/1999. I had exactly the same problem as you. When I listened to music, everything was fine, but when I watched a movie I would see the dreaded "Protect" when the Low Frequency Effects (LFE) -- i.e. the deep bass -- got really strong (as shown on the bar graph of my receiver).

At the time, I was just using okay Technics speakers and I didn't have a subwoofer. But later I got an Energy Take 5 sound system that had a separate 8-inch subwoofer. I told my Sony receiver that I now had "small speakers" (instead of "large speakers" with my Technics speakers) so that the Sony receiver would send the LFE to the subwoofer. Since then, I have never seen the "Protect" message again.

You can find the manual for your receiver here: Sony eSupport. In the Troubleshooting section it says on page 71:

Quote
PROTECT
Irregular current is output from the speakers. The receiver will automatically turn off after a few seconds. Check the speaker connection and turn on the power again.

sony str-dg500

Reply #3 –
I apologize for tacking this onto an old post but here goes...  I have a Sony STR DG500 that displays the "PROTECT" error and shuts off whenever I try to turn it on.  The thing is, I've tried the advice about disconnecting the speakers and it still has the same issue.  The speakers sound fine and I've even twisted and jiggled the wires to see if I could make it short out but it doesn't.  If I unplug the unit and let it sit overnight, however, the next day it seems to be fine.  I'm doubtful its an overheating issue because it can be fine while watching TV for hours at a time, but if left off for a couple of hours it gives the "PROTECT" error when you turn it back on.  Its an old model, but it's only been in actual use for about a year. (A friend shelved it after 3 months for a newer model.)  It replaced a higher quality model Sony I had for about 7 years which had a similar problem, but that actually WAS a definable problem  The center channel crapped out but the speaker was fine.  Is it possible my speaker is to blame?  It sat virtually untouched for those 7 years and when the receiver works it sounds fine.  I'd like to avoid spending money on a new receiver if my speaker is just going to kill it, but I'd also like to avoid having to spend even more money on new speakers if they're not the problem.  Any advice?

sony str-dg500

Reply #4 –
Quote from: Tom N. on
I apologize for tacking this onto an old post but here goes...  I have a Sony STR DG500 that displays the "PROTECT" error and shuts off whenever I try to turn it on.  The thing is, I've tried the advice about disconnecting the speakers and it still has the same issue.  The speakers sound fine and I've even twisted and jiggled the wires to see if I could make it short out but it doesn't.  If I unplug the unit and let it sit overnight, however, the next day it seems to be fine.  I'm doubtful its an overheating issue because it can be fine while watching TV for hours at a time, but if left off for a couple of hours it gives the "PROTECT" error when you turn it back on.  Its an old model, but it's only been in actual use for about a year. (A friend shelved it after 3 months for a newer model.)  It replaced a higher quality model Sony I had for about 7 years which had a similar problem, but that actually WAS a definable problem  The center channel crapped out but the speaker was fine.  Is it possible my speaker is to blame?  It sat virtually untouched for those 7 years and when the receiver works it sounds fine.  I'd like to avoid spending money on a new receiver if my speaker is just going to kill it, but I'd also like to avoid having to spend even more money on new speakers if they're not the problem.  Any advice?


I repaired a Sony theater amp for a lady at work last year. In that case one of the power amp modules (power amp ICs) had failed and was outputting 12V DC to one of the outputs causing a fault mode. Replacing the module cured it. The replacement came from MCM electronics for around $15.

G²