Question about Alpine MRV-T707 Car Audio Amplifier

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LED Light green but no sound.

I had prior problems with my ampflier blowing fuses and after replacing the fuses, which again blew, I finally went into my sub-box and found what I think was one of my speaker wires loose and grounding out (?). Now after fixing the speaker wire problem I get no output sound but the LED light still comes on green. What can I do? Thanks in advance. Mary

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Re: LED Light green but no sound.

Disconnect all power cables first then short between G&P G&R try again with only one speaker at a time.

Posted on Aug 22, 2007

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The amplifier probably has shorted output transistors.

Disconnect the speakers and RCA cables. Replace the fuses with two 10 amp fuses or a single 20 amp fuse. If the amp blows the fuse when it powers up, the outputs are almost certainly the problem. Don't try it with the two 30 amp fuses. The smaller fuses will provide more protection for the power supply. If the amp powers up with the smaller fuses and they don't blow, check the speakers and the wiring (for shorts to ground or shorts between wires).

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disconnect all power (15min) try again with different speaker to see if sub is dammage.

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Check the main amp fuse under the hood, even if it looks good just change it. Often times that light on the amp can come on just from the power amp tunon wire. Try a friends subwoofer box just to make sure the connectors on your box are good, and if that doesn't work then give me some more details....year/make/model of car, what kind of sub, what types of things do you see on the side of the there a green light as well as a red light?

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Disconnect the speaker wires from the amplifier and see if it still goes into protection mode. If it still goes into protect with the speakers disconnected, there's a problem with the amp; if not, you may have a blown speaker or a shorted speaker wire.

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Sounds like you have shorted output transistors or IC'S There is one test is to disconnect all the speakers and see if they still blow. If they do then you need to have the amp fixed or replaced. If they dont blow try connecting up each speaker till the unit blows the fuse asjust maybe you blew out a crossover or a speaker or two?? If you have an active type crossover then I would check that device as well. Good Luck

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