Question about Sony STR-DE835 Receiver

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My Sony model STR-DE345 flashes (Protect) 4 to 5 seconds after the power is turned on. It's not the speakers cause there not hooked up. How can I trouble shoot to find which part needs too be replaced? Also if you have a fuse that's a higher amp than came with the unit. Could this cause the stereo to flash this prompt (protect)

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Sony receivers in this series do a series of tests on the integrity of the audio path before allowing voltage to be applied to the output transistors.
First make sure the speaker selector is set to "off". Test it again. If it still does the same thing then:
If you are comfortable removing the cover, take out the four side screws and the screws on the rear top of the cover. Look at the volume control and make sure the ribbon cable is firmly inserted in to the slot at the back of the control. The next part is a little more involved. There are two ribbon cables on the circuit board on the front of the face plate. One is close to the front, the other is not. You can remove the face plate and check thoes cables, but you must remove the screws from the bottom of the face plate and the one screw holding the volume control in place.
If this is all in place, I recommend sending it in to Sony for repair.

Posted on Aug 31, 2010

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1 Answer

No sound. It flashes protect.


Your device has went into protection mode, an internal malfunction causes it to shut down in order to protect itself.
Somtimes a physical reset will help.
Turn of and unplug device fro a couple of hours

Feb 15, 2012 | Sony STR-DE345 Receiver

2 Answers

My sony STR-DE345 amp says "protect" and there is


The manual says it thinks there is a short circuit on the amplifier output side. If it still says Protect after disconnncting all the speakers wires there is an internal problem. Take it to a hands-on tech.

If the problem disappears, you had a short. Attach speakers one at a time to isolate the cause.

http://www.retrevo.com/support/Sony-STR-DE345-Receivers-manual/id/387bh943/t/2/

Dec 24, 2010 | Sony STR-DE345 Receiver

1 Answer

The display say "PROTECT" whenever you turn it on.


your sony channels receiver it says protect bec ther is to much power on the speakers to fix it get les powered speakers then it will work

Jul 26, 2010 | Sony STR-DE345 Receiver

1 Answer

When i turn it on it works 4 a few mins then protect flashs


shorted outputs. it needs parts replaced in the main amplifier section. typically $ 120.00

Mar 05, 2010 | Sony STR-DE345 Receiver

1 Answer

Keeps flashing PROTECT when switched on


Check all of your connections very carefully. If all seems well, disconnect one wire at a time, then power on after each wire is disconnected. Alternate between power off (remove a wire) then power on. If the PROTECT comes back on, reconnect the one wire and then power off. Disconnect the next wire, power on, and see if the PROTECT comes back on. If so, reconnect that wire and continue until all of your wires are checked. If at some point after disconnecting a wire and powering back up, the PROTECT does not appear, that wire you just disconnected is the culprit and needs to be replaced. Even a single strand of speaker wire crossing to another opposite polarity (speaker wire) or input can cause a fault making the receiver "PROTECT" itself. Although it may be tedious, it is effective to trouble shoot this way for the first step. If you want disconnect all wires from the receiver and then power on to see if it does it independently of any other connections. I hope this helps and good luck. Please vote 568462d.jpg below if this is helpful.

Oct 30, 2009 | Sony STR-DE345 Receiver

2 Answers

Sony str de345 in protect mode


If PROTECT , PROTECTOR or a P is flashing in the display of the A/V receiver, there may be an incorrect connection or an improper setting. Try following these steps to resolve this issue:
IMPORTANT: If model-specific information is needed to complete any of these steps, refer to the instructions supplied with the product. Manuals are available online through the Manuals/Specs/Warranty link on this page.
NOTE: Because each of these steps represents a possible solution to this issue, check the A/V receiver status after completing each step.
  1. Check the speakers and speaker wires for proper connections.
  2. Reduce the volume level. IMPORTANT: If the A/V receiver is used at maximum volume level, it may enter the PROTECT mode. Maximum volume listening will cause the A/V receiver to run very hot and may drain the output capacitors.
  3. If applicable to your model, disable the surround sound option if both the A and B speakers are being used simultaneously.
  4. Ensure the top of the A/V 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 A/V 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 approximately 1 to 2 hours to reset the output transformers.

Oct 22, 2009 | Sony STR-DE345 Receiver

1 Answer

Protect flashing


es posible que un canal se ha dañado por lo que primero daño el fusible con la sobrecarga y posteriormente se daño el canal. es necesario se revisen las polarizaciones de los transistores para determinar el canal dañado,es seguro que el daño se encuentra en uno de los frontales.

Mar 21, 2009 | Sony STR-DE345 Receiver

1 Answer

PROTECT FLASHING


The protect circuit is doing it's job....probably the amplifier
output stage is shorted.....have a technician check it..make
sure any / all bad connects are soldered when chassis is out
for service......................T.

Jan 04, 2008 | Sony STR-DE345 Receiver

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