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Amp wont turn on, but i hear a pop when turning off

I checked with multiple cables, and different plugs, but the amp will not power on, but when i turn it off, i hear the same pop-ish sound you usually hear when turning off an amp.

I just got this amp brand new about a month ago.

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If you can, look at the PC board, usually this indicates a blown amplifier chip, transistor or FET. The poping sounds can be the transistor base feedback, because of the RC filtering and amplification. You can sometimes see brown, or lifted clad on the board, if not always lick your finger and touch the top of an amp chip. I say lick your finger because if it is shorted, it is going to be hot!!!!! When you lick you finger, you will hear the sizzle before you burn your finger, just be careful not to touch the high voltage.

Posted on Jan 14, 2013

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First off nothing should pop when turned off next it could be a grounding problem external or internal or worse an audio output problem take a volt meeter and turn key to on check the ground and positive on the amp should read 12 to 14 volts do same with ground and remote wire if these both read correct remove the back set your meeter to the diode setting the audio outputs are usually the larger ones but sometimes not take your leads and touch out side legs then to the outside to center try each one every way you can switching leads if at any time the buzzer stays on or goes to flat 0 then that output is bad if all check good i would go through the car making better connections and cleaning up any wires that might seem to be faulty maybe even replace your RCA cables
im running 18 speakers and 8 amplifiers in my car and i have done this several times :( but i don't pop unless something is wrong hope this helps

Posted on Jul 24, 2009

  • ex32006 Jul 24, 2009

    guess i been working on cars to long sorry the poping you are hearing is most commonly caused by a faulty saulder joint in the pots or in the input output plugs sorry 1:30 am lol you can check outputs same way though pull the board and give it a good look over if there apears to be a ring around a leg through the board re saulder it try moving things but be gentle watch legs on underside for movement or you could do it the hard way and just resaulder the whole board done that before you may need glasses after you finish lol

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However if the frequency is around 50hz (the G 2 1/2 octaves below middle C on a piano) it is most likely due mains electricity interference or an earth (grounding) issue.
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  8. Turn around or stand in a different position - it might simply be the pick-ups in your guitar causing interference in the magnetic field of the power supply.
  9. Does plugging in or unplugging a signal lead / guitar make any difference? This particular amp requires only mono jack plugs a stereo (trs) plug may be shorting across terminals
  10. Does it change when you touch the strings with your hand? If yes check internal wiring and screening within the guitar.

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Wonder no more, there are many others with many different brand of amps that do this. Obviously it needs repair unlless you have a problem with the cable or source you are using or have forgot to turn up the gain controls which I am sure you have checked. There are so many possibilities that there is no way we can say open it and replace this... If you get a small pop in the speaker when you turn it off, then the power portion of the amp is probably OK. A common probllem on amps that have a preamp out or power amp input jacks is a failure of the switch contacts on the crummy jacks that pass the audio through from teh preamp to the power amp...

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First, plug in a set of headphones into the preamp out jack. Note that due to the impedance mismatch what you hear will not be very loud. Now change the state of the clean OD. Did you hear a faint pop?

Next plug a LOW impedance device OR even an instrument cable into the power amp "input" jack. Do this with the power off then warm amp up.
Now, change the state of the clean OD. Did you hear a faint pop?

Now for the analysis. If you did hear one in the first test and NOT in the second, the pop you are hearing is the "NATURE OF THE BEAST".

I can tell you from the design that the pop you hear is from coupling within the clean and OD relays within the unit. There is no cure for this within the unit other than find another brand...

I would recommend that you use an EXTERNAL pedal for the effects you want rather than trying to use the clean OD in this amp. I suspect it was never intended to be shifted during playing as I can guarantee it will pop when you shift while having anything other than dead silence (not even a bit of hum from your guitar). There is also statistical noise in the preamp that the laws of physics will not let us get around that may be enough to create a bit of a pop.

You could also use a volume pedal between the preamp output and the power amp in to throttle the volume to zero before shifting to OD.

In general I think you will find that what you are hearing is the nature of this beast.

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