Question about Sony STR-DE535 Receiver

1 Answer

Power On Displays Flashing "Protected"

I have a Sony STR-DE535 amplifier and sound system. Whenever it is powered on, in the display window is the legend "Protected." I turned all the speakers off position and when I powered on again, had still the same problem. The same "Protected" alert displays whatever program I request from the amplifier, be it radio stations or TV or whatever, and the system does not function. No sound at all, not even static. I checked the troubleshooting guide in the back of the Users Manual; no help. Any help in finding a solution to this "Protected" problem will be sincerely appreciated.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Sony Master
  • 1,550 Answers

The audio amplifier IC´s are on short circuit.

Posted on Sep 13, 2008

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Sound went off,says 'protect'

need replaced power output
transistor amplifier short

Nov 15, 2009 | Sony STR-DE475 Receiver

1 Answer

Blown Stereo Receiver

If the output transistors are shorted they cause burns on the resistors and even even blow the AC fuse and your receiver will not come ON. I used to enjoy fixing, these AMPs this was many years ago. Any how, repairing this unit will be more than a $100.00 my advice to you is BUY a NEW 1.

Good luck
N Sabre

Nov 08, 2009 | Sony STR-DE535 Receiver

1 Answer

What fuses does the sony str-de535 need

I beleive it is a 6.3amp gma. It will be printed on the circuit board next to the fuse holder and on the fuse itself. If it is open(blown) you probably will need to replace a set of the output transisters (mp1620 and mn2488). DO NOT use a slow-blow fuse this will cause more damage to your receiver.

Oct 21, 2009 | Sony STR-DE535 Receiver

1 Answer

Sony str db870 master reset

If the power of the Receiver is ON, press Power to turn OFF the power. Then, hold down the MODE + button and press the Power button together.
S.F Intialize appears in the display and all sound fields are reset at once.

Sep 22, 2009 | Sony STR-DB870 Receiver

2 Answers

Sony str-de525 system "protector" problem

You've blown it. It recognizes a potentally harmful situation and goes into protect mode.

Mar 15, 2009 | Sony STR-DE935

2 Answers


Change the audio amplifier IC´s are in short circuit that´s why your device go on to protection mode.

Sep 13, 2008 | Sony STR-DE535 Receiver

1 Answer


First for the volume you need to clean the potentiometer,and on the tray check the belt of the motor charge

Jun 11, 2008 | Sony STR-DE535 Receiver

3 Answers

Sony STR-DE310

Our Sony STR-DE310 displays the message "Protected" and will not operate. We have not used it for awhile, but it worked finte the last time.

Jan 27, 2008 | Sony STR-DE310

Not finding what you are looking for?
Sony STR-DE535 Receiver Logo

319 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sony Audio & Video Receivers Experts


Level 2 Expert

117 Answers

Cindy Wells

Level 3 Expert

4754 Answers

Pieter Vleeshouwers

Level 3 Expert

1410 Answers

Are you a Sony Audio and Video Receiver Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides