Hifonics amp wont turn on11/12/2023 ![]() ![]() I am quite a kindergardener when it comes to components. I watched them solder some things maybe 4-5 times and basically grabbed the knowledge that the solder gun is how the legos get glued into place. Then i seen the monitors being switched out, and i thought that was very crafty for someone to do that in a 'shop' themselves as a quality to mankind. I seen about a dozen arcade games disassembled and the pcb boards always excited me like legos. I grew up in an arcade room and there was electronic engineers that would work on the video games. I have a digital camera (2 megapixel webcam) If you have more the 500MVDC or 0.500 volts DC you might have the above issue of a shorted channel or internal power supply issues.īy the way could you shed some more light on which model Hifonics amp were talking about ? They had many different types and styles built for them through out the years and not knowing which one could be misleading to you real issues at hand.thx. Then I would measure the RCA DC voltage with respect to the DC supply ground, measuring both the shield and the tip one at a time. And I would use a 10 amp fuse inline if you lack a controllable power supply such as you PC power supply is. If so I would power the amp back up on a current limited supply with absolutely nothing hooked up but power and turn on. By chance do you have any electronic skills what so ever? Seen this a few dozen times in my life.Īs to what caused it and how badly damaged it is well that will take some teching to figure out. Now if this was opened up by burn out then yes you could melt your RCAs by sending DC voltage back out the amp along the RCA ground shield. Most car amps have a current limiting resistor inside that connects the RCA ground to the 12 volt supply ground. This might be plausible since the RCA ground is also the center tap of the secondary supply, and if you managed to let the smoke out of a channel its possible that it shorted to the internal ground, which also headed out to the nearest high current ground like your signal source. As it sounds like you sunk a power rail inside the amp to the RCA/internal ground. ![]() Well the fact your RCAs melted I would say the RCA ground is intact and doing its job very well. I dont have any money to have an electronics engineer work on this amp.Īnd rather than waiting the many months until i will have an extra lump of money, i thought i would see if anybody was willing to work with me. (didnt look for golden / browned resisters though) I've looked at the inside of the amp before and nothing was burnt badly enough to catch my eye. ![]() Someone on this forum already mentioned "perhaps a ground trace has melted,or the ground(s) on the RCA jacks are open." So i want to use my 12 inch woofer in its sealed box to play from 10hz through 40hzĬan somebody walk me through the process of diagnosing my amp to determine what is wrong? The little subwoofer is tuned at about 34/36hz and bottoms out sometimes with the wide range of music i listen to. The subwoofer pre-out on the receiver still works because i hooked up a computer 2.1 system up to the subwoofer output and i have normal functionality. Well once i got to unplugging the rca cords, i realized that they MELTED and there was nothing left but copper for more than one foot in length. Nothing worked and i started to scratch my head as i was taking the setup down. So i proceeded on the computer trying to get some audio from the amp. ![]() I paused for a second and waited for things to get worse, nothing happened. While i was messing around i thought i smelled something but it wasnt a typical electrical smell and it was faint. I know i tried to turn up the gain within the trueRTA program to compensate for the amplifier's low gain. i know i tried to turn up the receiver to compensate for the amplifier gain being low. I dont remember what i did exactly thereafter. I hooked the rca wires back up and left the gain all the way down. Thinking little of it i unplugged the rca cords from the amp to protect my receiver and reset the powersupply. So i began slowly turning the gain up and the subwoofer let out a noise and the pc powersupply shut off. While i was hooking everything up i turned the gain down all the way on the amp. I hooked up the rca wires to the receiver and played a low sine wave from trueRTA. Well i got the power supply turned on and had six positive and six negative cables screwed into the power terminals and the amp powered up fine. so i grabbed a spare power supply from an old dell XPS desktop and decided to hook up the amplifier in the house with my home theater receiver for some boost below 40hz I forgot that the amplifier was doing that and i remember i had some audio but ground noise in the car. I had this amp hooked up in the car and the amp would play audio at a low level but when i turned the gain up the subwoofer would start flapping in and out. ![]()
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