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I have a sony A/V Receiver STR-DE935. I was listening to it with surround sound, the protector screen lit up, receiver went out, no sound. I turned it back on, still no sound. protector still lit. I proceed to remove the cover I found two fuses blown. I replaced those fuses, and with the cover off. and no components plugged in, I observed the fuses blowing when power button was pushed. The Receiver still powers up with LCD displaying "protection" I think the capacitors could be damaged. what do you think could be wrong?

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Well, if you see any capacitors with their top bulging out, then they are bad, otherwise you may have a short, overheating issues or a variety of things. I would check the power supply to start for damage. It sounds like it is drawing too much power. Do you have the system on a surge protector? If not, then try hooking it onto one. Let me know how this turns out.



Benjamin

Posted on Jul 17, 2009

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Oct 23, 2008 I have the same "Protector" problem. There is mention of this on Sony's website:

Follow the steps below to troubleshoot if the word PROTECT or PROTECTOR is flashing on the A/V receivers display.
  1. Check the speaker wires and speakers for proper connections.
  2. Reduce the volume level. IMPORTANT: If the receiver is played back at maximum volume level it may enter the protect mode. Maximum volume listening will cause the receiver to run very hot and may drain the output capacitors.
  3. Disable the surround sound option if both the A and B speakers are being used simultaneously.
  4. Ensure the top of the receiver has proper ventilation to keep it from overheating.
  5. If the message only occurs when using a DVD player, the sampling frequency may be set too high. IMPORTANT: Some receivers provide compatibility with the higher sampling frequencies through alternate connections. Consult the owners manual for specific information.
  6. Unplug the AC power cord for about 1 to 2 hours to reset the output transformers.
If the issue is still unresolved, service may be required. The Sony® eService Web site at http://eservice.sony.com/ can assist you in obtaining service from a Sony Service Center or locating a Sony Authorized Servicer.
**********************************************
I followed their "advice" to troubleshoot...now my unit's been in the shop for a couple weeks.
I called for status today 10/24/08 and was told that there is a "backorder on a part". My repair
shop cannot estimate when the "part" will be available.

SO...I suspect a component failure and since Sony does not have the part, the questions are:
1. Is there a delay in Sony getting the needed part from the manufacturer (if it's not Sony)
2. Are there so many occurrences of this problem that Sony can't keep the the "fix part" in stock!!

Time will tell!

Dec 02, 2007 | Sony STR-DE935

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