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Re: unit wont stay powered up
Check for overheating. Place the unit in a large plastic bag and place it in the refrigerator for 1/2 hour. Don't allow condensation to appear on the unit before powering it up, the heat will evaporate any potential condensation. Put moisture absorber or rice in a paper bag in the plastic bag for safety to absorb any moisture. Then power up. If still inoperative check for DC or AC voltage on speaker connectors. If one side is different, or if DC appears on the outputs, audio output may be shorted. See if plugging in headphones stops the problem, some units disable the audio outputs with headphones plugged in.
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if you turned it on without speakers hooked to it you may have blown the speaker output amps or if the end of the amp remote wire touched a ground you may have burned a trace on the board did you here it play at the pawn shop? or did it just light up? sometimes the people at the pawn shop think if the unit lights up it is working and sometimes they check them is just hook power to them without speakers if so this can blow the speaker output I would take it back to the pawn shop
disconnect the speaker wires at the unit and tape them off one by one. Then re-power up the unit, if it still shuts down, it is an internal problem and needs service. If it stays on, re-connect one speaker at a time and test power again. When you find the speaker with the problem it will shut off. It's going into protection and keeping itself from damage. Once you find the bad wire or speaker, check the wire by disconnecting it "at the speaker" and turning the unit back on. if it still cuts out, replace the wire. If it stays on, meter the speaker by checking it for resistance, if your meter reads 1..... the speaker is blown and needs to be replaced. If your not handy with a meter, go to any car audio shop with the speaker and they can test it for you, usually for free. Hope this helps.
This looks like its displaying the Time format. Try disconnecting all speaker one a time and turning on the unit to see if it turns off. Disconnect one speaker at a time and turn the unit on. If it turns off with only one speaker conn then this speaker is your problem. Amps will shut down if a speaker goes bad. Another thing to try is disconnecting all inputs and speakers from the unit and see if it stays on. Then reconnect them one at a time while watching what the unit does during power up. Also you might want to open the device and check for blown fuses. Check for any speaker terminal wires touching each other if so it will shut down thinking there is a short.
the message you are getting is "amp guard". This is the mesage it will display when a short in a speaker wire or speaker with low impedence is hooked to the internal amp and sends it into protect mode, shutting down the amplifier section while the rest of the unit continues to work.
Check your Factory speaker locations for blown speakers or bare wires to metal.
Disconnect all your speakers from the receiver. Turn the power on, and see if it stays on. If the unit shuts off with all the speakers disconnected, then you most likely have a faulty unit, and it will need to be repaired or replaced.
If the unit stays on with all the speakers disconnected, then you most likely have a bad speaker or a bad connection with the speaker wire.
Starting with one speaker, hook it up, and turn the unit on, and again see if the unit stays on, or if it shuts off. Do this until the unit shuts off when you connect a speaker.
Then disconnect all the other speakers, and leave the suspect speaker attached. Again, try to power up the unit. If it fails with that speaker attached, but works when it is not attached, then that speaker is your problem.
That is a check the speaker wire error, caused by a short or perceived short. If you look at the back of the receiver you may see 1 strand of the wire loose, they are very hard to see sometimes. You may use banana plugs as it is painful to get everything hooked up without a few loose strands.
If there is still the issue check your speaker connections for the same issue. If they are in ceiling/wall speakers disconnect them all then plug them in one at a time to narrow it down.
If the issue persists perhaps one of your speaker wires has a short somewhere, could be a misplaced drywall screw from hanging a picture, or a carpet tack strip, or a pet deciding it was a nice chew toy.
If you are completely sure it is none of those then I would say it is a bad speaker or receiver. Try changing in and out known good speakers/receivers if you have access to them to see which one it is.
make sure the speaker grounds are connected to the speaker ground wires on the deck and not the "chassis" ground. also make sure both power wires are hooked up to a power source. the thinner power wire is supposed to be a switched source (like the ignition key or an accessory switch) that turns the unit on and the thicker one is a constant source which actually powers the deck once the switched source is turned on.
check your ground, it could be that your antenna is the only source of ground, in which case the deck does not have enough power to stay on when it draws too much power. I've seen exactly what you are saying many many times. Ground it really reallly good.