I have the same problem. I took it to a local repair shop and was told that the problem is one of the boards that come off of the main board. Hifonics does not sell those directly to people so you would have to send in for repair. For the prices that they sell for now, its just better to get another Hifonics amp. They are great when they do work.
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Re: Power good no green light no subs
Make sure you got a good ground. do not ground on painted surfaces! If
you got power from battery, check the remote wire running to cd player.
Hook up remote blue wire with the one for cd player. If you still have
a problem and the fuse is good, then the amp is fried
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Check all of your power connections, your speaker connections and battery connections. if all are good and clean (no shorts/wires touching) then try unhooking your speakers and see if the lights come back, if that helps then you have problems with your speakers, if not then amp is bad. I hope this helps ya.
Your amp could be in protection mode! Sometimes turning up to high or wires touching will put in protection mode! It will have to be unplugged for a day or two to drain all power out of the memory. Leave accessorie/ignition wire hooked up, just not power and ground wiring. It should reset itself.
this is caused by inproper wiring from the speakers/subs to the amplifier.. an amp will still put out power to subs and speakers when it's wired improperly but it won't last for very long doing it... 6 months is longer than usual....
Sounds like your amp has some power supply compents shorted out. Maybe some of the power mosfets are shorted and your only getting a little bit of power. That why only the H is lighting and as far as the green light, it don't take much for it to turn on. If it was major it would go into protect mode but it is'nt. I repair amps for a living and I'm the cheapest you'll find. But if you know about electronics and think you can take a crack at it, check it out. Becareful you could do more damage. Let me know if your interested. email@example.com
it is probably the rca inputs on the amp may have fried. was your cd decked turned up loudly before the power went out? did any wires accidently touch each other? If had worked fine and then suddenly stopped, than either a wire came loose or the inputs fried. try using different cables and I also suggest disconnecting power for 24 hours and then reconnect. If the green light is on then it is getting power and the problem is in the rca cables or the inputs
Grab yourself a test light and make sure that not only the 12v red power wire is putting out power but the thin blue or 12 volt turn on wire is also showing power. Then test the ground terminal and make sure u have a good ground. If that doesnt work try checking the amps fuses and check the fuse and connection on the battery. If everything checks out ok and the problem persists then put a small test speaker to the channel outputs and make sure that u are getting noise from those channels if you dont get any noise then u most likely have bad outputs and blown channels, you will need a new amp. Good luck, hope i was good help.
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 amp....is there a green light as well as a red light?