Question about Sony HT-SL55 System

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Sony ht-sl5 switch on then after 10secounds shuts down and protect appears on the display .and cannot do anything with it but turn it off

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  • ribisal Apr 04, 2009

    I have the same problem with the HT-SL5, but then after approx 2 hours

    when the amplifier is warm, the middle speaker makes a loud noise and

    the display gives PROTECT. By switch of and on again the PROTECT

    indication is dissapeared. I have disconnected all speakers and inputs.

    The fan is running by power on and no burned components are located

    inside.I hope that someone has the electronic diagram off the sony HT-SL5, it can be help by fixing my problem.



    Richard



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If your problem is "switch on then after 10secounds shuts down and protect appears on the display .and cannot do anything with it but turn it off"

Then the unit is on protect mode, that is a special diagnostic mode that starts when the unit detects an internal fault.

To start unplug the unit from power for ten minutes, and see if this reset the protect mode, I guess you have done this already.

The first thing to do is to start the unit with nothing connected, if the unit does not go to protection, then the problem was one of the cables or a connected device.

If that does not fix it , there is a master reset , by pluggin the unit into main while at the same time you hold the power button.

If still no luck then the unit is defective and must be taken apart and tested with a multimeter.

You start checking for burnt areas on circuits, cold solder joints and leaking capacitors at sight, then there is need to grab the multimeter and do the real testing job.
When you find the problem you do the soldering.

Naturally this requires a certain experience in fixing electronics, to complete the job usually a precision soldering is needed.

Posted on Feb 17, 2009

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The protect mode indicates that a problem was detected in the final stage of the output amplifier. The unit is shutdown to prevent further damage to either the amp or the speakers. I don't kow the specifics fo your model, but if it has discrete transistors for outputs, the parts cost will be in the $15-$25 range. If it have an AMP pac, expect parts to run in the $60-$75 range.

Dan

Posted on Feb 17, 2009

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Posted on Jan 02, 2017

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Help


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Take every single cable out of the unit, now power on the unit.

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If it powers on ok, switch off and insert 1 speaker at a time and power on the unit until the protection mode comes on again, the last speaker you have put in has overloaded it for some reason, also as you are trying each speaker use the volume and bass controls to see if there is an internal overload.

Thats as much as I can offer you until you narrow the fault down to the unit or one of the speakers.

Cheers

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:D
/ lemurt

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