Question about Rockford Fosgate Punch P4004 Car Audio Amplifier

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P4004 - Blown Components

Hi, I have P4004 amp (board number: PC-4712 Rev C). Resistor R41 and Capacitor C22 have clearly blown as they are scorched and the component values on them are unreadable. Does anyone have a schematic for this unit and be able to tell me these component values? Then I could fix it and be on my merry way. Cheers.

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If burned components are on output stage or amplifier section on board..Then look at the oposite side of amp..Both amplifier section should be a mirror image oof componentc from other..that way you can know the values of parts.If they are on power supply section ..Then you might need manual if available..

Posted on Dec 24, 2007


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I get a fuzzy sound out of the right speaker. New speakers and wires so that is not the problem

it sounds like a blown channel in the the amp and see if there are any fuses that might be might be a blown capacitor which a tech should be able to easily fix

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The capacitors are industry standard items that can be cross referenced from the component markings, values, or part numbers referenced on the components through several national component suppliers such as Digikey, Mouser Electronics, or Newark Electronics. If a single bulk capacitor has blown, both should be replaced as the other will have been stressed and should not be trusted to be functionally sound.

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Hi; my friends blew the power supply board on this desk; will I be able to change individual components or have to fork out 160 euros for a new board? I think I could cope with changing components if...

It is likely one of the amps have blown as well as the power supply. The pwoer supply wipes out about $30 of components when it goes. If the fuse had been replaced after initial failure this results in more damage. For the power supply, typically the two IGBT's are wiped out and the four transistors driving them as well as the regulator chip and one or more of the gate speedup diodes which are surface mounted. Sometimes the surge limit resistors which are ceramic pacakged are blown. The hardest part is removing the heatsinks with the IGBT's on them. You DO need a desoldering station to work on this.
Usually you will find damage to the rearmost amp in the amplifier module. An arc beween layers of the multilayer circuit board causes inital failure. Three MOSFET transistors are blown and a Zener plus the board is charred and this cancer has to be ground away and re-insulated and circuit traces replaced by jumpers. Sometime the .03 ohm metering resistor on the bottom is fried... when that happens, two small surface mounted transistors are blown as well. All in all $50 of components are damaged typically.

Oct 31, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

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My CDA microwave oven, model CM5 apparently has a faulty capacitor. It appears to have a black scorch mark on it and looks like a tiny part of it has blown out?

This indicates capacitor failure either due to it "blowing" out or due to arcing.

The capacitor can be replaced if you can find a like for like one and feel confident in doing the repair.

Exercise caution however handling the old capacitor as even if it is defective, it is still possible it could hold some charge so discharge it though a 1 meg wirewound resistor to the chassis before handling the terminals.

Mar 23, 2010 | Microwave Ovens

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Hi One of my surround channels drops out?


If it is only one channel which is dead, you might just be in luck.
If the amp is still in the warranty period, just send it in, if you open it up, you will loose your warranty.

If it is out of the warranty period open up the amp. You should see the circuit board now and it should look something like this.e1de0ce.jpg

Okay, now follow the path on the circuit board on the channel which is not working. On the path you should see the capacitors looking like this.


Now, it s usually a loose or blown capacitor, you should be able to see very clearly if the capacitor on that certain channel is blown. If you can solder a new one in, if you dont know how, just send it in for repairs, wont cost a lot.
If it is a loose capacitor you should be able to feel it, just have a look, if there is something blown you will notice it quickly. You should also be able to smell a sharp smell.

Kind regards

Nov 13, 2009 | Marantz SR-6300 Receiver

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Blown capacitor but....

Be sure you replaced the capacitor in the proper (+) (-) orientation. There is a half moon shape line on the board on one side of the capacitor legs, that is the negative terminal. If incorrectly installed it will not work.

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Power supply board component out

Hi goikem

I would replace the capacitor first and check the resistor with an ohms meter to see if it has changed in value(gone high). remounting the resistor (you may have to replace it also to do this with longer leads) to be clear the Pcb and also the capacitor to be as far away from the resistor as a heat source also may help. Darkening of the board is not uncommon where there are power components. Having said that, it should not generally happen in the first place... but it often does. Power supply failures in modern gear relates to heat stress so often. Capacitors failing from this overheating is the biggest problem of all. In the workshop, where we suspect that caps have failed, we generally replace them all, and always use good brand name 105deg rated devices(Rubycon or Nichicon brands i prefer) to help minimise the recurrence of failure. You can order them from Farnell in most countries of the world. If you cannot identify the values of the components, I am happy to try and help you here. Please feel free to ask any questions you may have. FixYa rating is the best way to thank me for helping you out. Cheers


Oct 17, 2008 | Audio Players & Recorders

1 Answer

Resistor on power supply board

Dear Biigjohn, First, first C613 means that it is a capacitor, not a resistor.And It seems to be a electrolytic Capacitor.If it has burst, then it's can will be inside. just search. the details of the Capacitor will be on it. most likely it will be a 10mfd 160V capacitor. Check and replace.

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