S-protection LG CM4630 stereo unit will not start will start to load then displays "good-bye" and "s-protection ' no audio output detected

Hi there,

When the word PROTECT appears on this display, this means the unit has detected a critical fault which could potentially cause harm to your stereo system.

The most common cause is a short circuit somewhere - something even as simple as loose speaker wiring could cause a short, triggering the Protect message.

You will need to determine if there is a possible short somewhere, so I recommend you start by firstly turning power OFF, disconnecting all speaker wires, then turn unit back ON.

Operate the stereo (without speakers) and turn volume up:

• If Protect message appears when turning volume up, then stereo unit itself has an internal fault
• If no Protect message appears, then suspect the speakers may be causing the issue.
• Reduce volume and turn unit OFF

Re-connect speakers (ensure the connections are secure), turn unit ON:

• If turning volume up triggers the Protect message again, there is an issue with the speakers or connections

Hope this helps.....

This is an indicator of an output load problem, turn unit off! remove the speaker wires from the back of the stereo, now turn power on and turn the volume down. If the word protect stays off there is a short in the wire or one of the speakers, but! if the word protect comes on " with the speakers and wires dis-connected " it indicates a short in the audio output ic pack in the stereo.

The protect has come on because it senses an output load problem, Turn the unit off, unhook the speakers and wires from the stereo, now turn the unit on and turn the volume down as far as it will go, this should reset the processor ic, if the word protect stays off you have a short in the wiring or bad speaker. If the protect comes back on with everything unhooked the problem is in the audio output ic pack in the stereo and will require a technician to remedy.

Hello grammagrisbo, hi your Kenwood head units will show "protect" when there's a problem with the speaker outputs so check to see if the impedance load meets your radio, 8ohms or 4 ohms?. having parallel two speakers on a single channel may cause this dilemma. This might also mean a shorted speaker wire, a blown speaker, or an internal defect in the head unit. Once the condition that's causing the "protect" mode is fixed, the CD player should be back to normal, the next time you turn it on.
If it's staying in "protect", then you'll definitely have to remove the stereo and do something to fix it. Many car audio stores will do system troubleshooting, for a fee. If you want to do it yourself, here's what you need to do:

Pull the Kenwood unit from the dash and disconnect all the speaker wires. power it on and see if the "protect" message displays. If it does, the stereo has an internal defect and will need to be serviced. If it doesn't, then turn it off, and re-connect one speaker only. Turn it on again and see if it will displays "protect" message.

If the radio works with one speaker connected, connect the other speaker to the second channel, you may have now the idea where the problem begun, you will identify the speaker that's causing the problem. There may be a wiring problem or defective speaker in that channel.

If it displays "protect" with a single speaker connected, then disconnect that one and try the other one. If all the speakers cause a "protect" mode, then you're probably back to a defective head unit.

Hi.

Protect mode start when the internal control circuit detects a fault, like a wrong voltage or a short. When protect is on the unit will not operate.

Disconnect car battery ground cable and check the wiring at the back of the unit, a contact in the connectors or a short on speaker wiring is common cause for protect mode.

When you disconnect the battery ensure that you have the anti theft code if needed.

Regards.

Ginko.

This is an overload protection feature. Check for speaker wires shorted to ground or a blown component.

The protect message indicates that the output amp section has a problem. Normally this requires the replacement of the output transistors or the output amp pac. Expect the repair cost to be about $20-$60 for parts plus the local labor rate.
Dan

You cannot . This a feature that detects a short and shuts the stereo off before it can do further damage. If you can disconnect your speakers try that then turn on your stereo. If it displays protect mode your problem is internal. If it stays on try hooking up one speaker at a time to see if one of your speaker is bad. Make sure you turn off your stereo before attempting to reconnect your speakers . Good luck

disconnect everything from the unit and see if it still does it.
if it does i would check the output transistor (ic).