Question about Sony STR-DE595 5-Channel Amplifier

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My sony str ksl5 is in protect mode. I have checked for bad soldering/burn marks etc, have cleaned up circuit boards but it is still same. There is a connection coming from my amp board LP801 soldered to the board but loose at other end. Could it be anything to do with this?

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You're the one with the eyeball on it. What do you think?

Does it self-protect with NO speakers attached?

Posted on Mar 15, 2011

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2 Answers

WHEN TO TURN SONY STR-DE635 ON AND NO AUDIO OUPUT


Maybe the Preamp driver IC, looks like a car audio ic on the main board.
Often with age the heat generated by the ic will destroy the solder.Makes it look like lava rock in bar-b-que grill. Which
causes an open circuit in the preamp driver to the audio power
stage.
Simply resolder them, most often restores audio. Should have
a bottom removalble cover.
If not, a fuse normally blows if ic or channel is shorted. Check if
display will say Power off, Protect, etc. That means there is a problem with a channel.
Most Sony receivers use darlington transistors, they short easily !!
I am an old school component level service tech, I think I do have a schematic for this model and many others.

Jan 12, 2012 | Sony STR-DE635 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

Sony STR-DE475 receiver ''protect'' problem


The relay or relays that click disconnect the receiver from the speaker terminals so that no dc voltage can burn out the speakers. More than likely the power output transistor(s) are faulty. Look at the relay(s), determine the input and output connections. The inputs come from the output power transistor and emitter resistors area, the output of the relay(s) connect to the speaker terminals. Check for dc voltage on the input contacts in the range of 30-60 volts possibly. If dc voltage is found there then you have bad outputs, caps or emitter resistors. A word of caution -troubleshooting at this level requires advance knowlege of electronics, do not attempt this with out onsite help from a experience tech.

Jul 01, 2010 | Audio Players & Recorders

1 Answer

Sony str-de935 protector flashing have to shake amp


Sounds like a bad solder connection. check around input jacks and tighten the screws that hold the circuit boards and the heat sink.

Jan 31, 2009 | Sony STR-DE935

1 Answer

Protect is on after a few seconds.


If the output are good, Check for a bad/loose ground. Check the solder near the input jacks, and tighten any and all ground screws that hold the circuit boards to the chassis. It could also be a bad transistor in the protection circuit.

Jan 22, 2009 | Sony STR-DE715 Receiver

2 Answers

SONY STR-DE535


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

Protect Mode


There are bad connections on the main board that are effected by heat. I would suspect that when the volume level is higher, the system shuts down sooner. This should be a simple repair that will not require parts. If you can solder, you should be able to repair this yourself. If not, the cost will be the local labor rate.

Dan

Jul 21, 2008 | Sony STR-DE345 Receiver

1 Answer

Sony STR DB-930 Receiver jumping into protector mode


I went through the amp/receiver and used small star washers on all the grounding screws I could find including the one securing the transformer, cleaned dust off all circuit boards, checked output transistors and fuses, all OK.

Re Assembled unit and it worked OK.

I will buy a fan and fan it to avoid sourcing heatsinks for the previusly suggested IC's.

Thanks for the technical help, sure solved my problem.

Regards

Darryl.

Mar 07, 2008 | Sony STR-DB930 Receiver

4 Answers

STR-DE945 stuck in auto protect mode?. I'm pretty sure it is the output capacitors but I do not Know where they are located to change them.


First of all my STR-DE845 started having the protector problem about 6 months ago and I bought this receiver back in 2001. This is what I found wrong with mine. After searching online I found a service manual for the receiver, this came in handy when diagnosing the problem. The first obvious thing was discoloration of the board around the IC 501, 601, and 701 Op-amps. When looking at the receiver from the front these are the three vertical NEC ICs to the right of the main amplifiers. Even with no load these amps get very warm. Sony failed to add any heat sink to these ICs so eventually they can de-solder themselves, specifically the 701 IC which is the one closest to the back of the unit. With mine I was able to slightly push the 701 more vertical, since it was leaning, and I believe it has helped it make a better contact. The protector circuit will kick in if it senses the Op-amps are shorted or not making contact. The best solution is to add some copper heat sink to these ICs, they already have screw slots for a heat sink. If they ever fail you will have to get new op-amps and re-solder them to the board. Hope this helps.

Jan 17, 2008 | Sony STR-DE845 Receiver

1 Answer

Sony "Protection" mode - STR-DE725


My sony used to do that to umm cant remember the model but yeh i could play it at low volume but as soon as i turned it up it would start clicking and telling me to turn of the power...

I resolved it by checking every cord connected to it, it turned out that because I connected two speaker cables together i didnt seal it properly and they were touching this was making it go into protetion mode.

Nov 25, 2007 | Sony STR-DE725

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