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Sony Model No STR-DE475 blinks "PROTECT" even with no speakers

There is no sound from stereo speakers and it was blinking "Protect" manual says it is caused by a short. I disconnected all other units and the speakers and TV and it still blinks PROTECT. Is this a throw away that costs more to repair than to buy a new one. Is it likely the silicon grease washers on the output transistors? I understand that is a lot of labor and not worth fixing. What is your thoughts?

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With all speaker wires disconnected and still showing the protect message, the short is internal. This is a rather common failure for these units. The output transistors are shorted themselves. These are relatively simple to replace and run about $15 each. Any service shop that repairs audio can fix this easily. Usually, once the outputs are replaced, you can get many additional years of service from the unit. Yes, it is worth it (in my opinion).

Dan

Posted on Dec 02, 2008

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I have the same exact recover right now as we speak. Try unplugging it for 30 sec then plug it back in. If not either you have a pinched wire or wires are touching somewhere or you turned it up to loud and it went into protect to "protect" the speakers, check connections and go from there

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Check for shorts in the speaker lines.The easiest way to do this is to disconnect all the speaker lines from the amp. Now, turn it on and see if it goes into protect. If it does,that tells you that the problem is in the amp.
If it doesn't go into protect, reconnect the speaker lines one at a time until you find one(or more) that shuts the amp down. That would be your short.

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The SONY STR DE595 goes into "protect" mode upon turning it on.I recut all speaker wires & vacuumed the receiver ...unplugged,differenet outlets...etc.Any advice?


The protect thing is to do with an overload. It's more than likely that something in the main amp section has failed (perhaps a transistor on the big heat sink). The cause often speaker wiring touching together. You should look carefully at the this section for damage or burning. If you have a ohm meter you can test the transistors. If you place the probes on the terminals of each transistor and you get a responce like you had touch the probes together, you have located the source of the overload.

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Does the set work for the 10 secs. If not you have the protection due to a voltage/current drain in the circuit.The protect works to prevent any further damage to the amp and is a safety feature. To look into the fault it is important to have an idea to go about. Disconnect the speakers and check if the fault changes, if so check your speakers for short and replace them or the coils. If not the output of the amplifer can be faulty. check in the output stages with a multimeter for failure of any biasing resisitors that can also drain more current. If you are not familiar get help. The failed component can be replaced after disconnection and testing. Hope my advice helps. Good day

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  • The amplifier is showing the protect mainly due to a safety feature on the power circuit. The fault could be failure or short in the output stages, short in the speakers, fault in the power ciicuit or the error amplifier that triggers the relay.
  • To trace the fault it is impotant to make the test in the main board, disconnect the power to output to confirm if the output is faulty. similarily disconnect the powering circuit one by one to identify. replace or disconnect to confirm. Hope this helps. Good day

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1 Answer

I am facing a problem with a SONY amplifier, model STR-DE185. On its screen is written the word ''PROTECT''. I have checked the transistors MN 2488 and MP1620 and are OK. Could anyone tell me what else...


Hi and welcome to FixYa,

Initially, the displayed message "PROTECT" is as it implies, the STR-DE185 has gone into auto-protect mode. The built-in auto diagnostics has sensed a fault and kicked in to prevent further damage to the Sony unit. In most instances, this is brought about by a faulty speaker (should be 8~16 ohms), loose/disconnected speaker wiring, strands of speaker wires inadvertently touching its opposite, overheated, ventilation holes covered, played with the volume level high for an extended period of time or a localized fault in the internal electronics of the amp circuitry.

Offhand, since DIY (do-it-yourself) repair is being done and assuming that you are comfortable working with electronic components & circuitry, use of a DVM/VOM, a soldering iron/station and safe practices with electrically powered devices, access to a Service Manual or at the very least, a schematic diagram would be a necessity.
  1. consider doing a RESET. Turn off the STR-DE185, press and hold the POWER button for 5 seconds or more or till "INITIAL" message is displayed. This would force the Sony to revert to factory defaults removing any glitches, errors in settings & configurations, presets, memories and user preferences;
  2. check if relays RY781 - to 783 are engaging;
  3. check pin 8 of IC901 (should be 5.6V);
  4. check protect switch Q784 to 786;
  5. check overload detectors Q705 & Q706;
  6. check that the MN2488 and MP1620 are not leaky

Good luck and thank you for asking FixYa.

Apr 20, 2010 | Sony Audio Players & Recorders

1 Answer

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Does the receiver say anything on the front like "protect" ? also; check the speaker A/B select switch. There are no speaker fuses in the receiver. Hope this helps

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HI...
It will need tech service.
Check the Sony consumer site for who can do it.

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preamplifier or power amp internally but check your signal cables for shorts or breaks,if amp then is internal and needs to be serviced

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