Question about Sony Mhcec909ip Mhc-ec909ip Mini Hi-fi System Boomboxe

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"Protect" Blinking on Sony Stereo

I plug it in and has PROTECT blinking so i opened it up and find coins in it so i take them; i closed it and plugged it in but it still blinks PROTECT. help please!! I've had it for two years; bought it new.

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May i see a diagram showing where the ic goes?

Posted on Oct 28, 2013

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SOURCE: My boombox is displaying the word "Protect" in the display. ???

The protect message indicates that there is a problem with the final stage of the amplifier section. This unit will require repair as a reset will not clear this. There is an audio amp IC inside that needs to be replaced. Figure on about $15 or so for the part.

Dan

Posted on Dec 09, 2008

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2 Answers

Why is it blinking protect?


Try disconnecting all the speakers and turn it on if it still goes into protect you will need to get it serviced but if it turns on then you have a problem with the speaker or wire run (check for shorts )

Roger

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this is a V22 chassis circa 2003/2004
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Unplug, let it sit for a minute and plug back in. Ours does that when power is interrupted.

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Got in car this morning and radio was blinking protect


Hi.

Protect mode is a special condition that kicks in when an internal fault has been detected. In protect mode all the unit function are disabled to prevent the stereo getting more damage in consequence of the fault. The state is a forced standby condition that starts when a wrong voltage or a short is detected.

Try disconnecting the battery terminal, pulling the radio out of the dash and checking the wiring at the back of the stereo. Most of the time protect mode is triggered by a wiring contact. If possible check also speaker wiring. A contact in wiring to speakers will trigger protect.

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Protect mode will kicking whenever a fault is detected.

Causes that can start protect mode are:

Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.

Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.

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If the unit is less than one year old, or if you want to get service, call Sony at the phone number listed on the product documentation.

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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

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