Wicks Posted November 6, 2011 Report Share Posted November 6, 2011 the yellow things are tantalum capacitors. Kind of looks to me either the MOSFET, resistor, or capacitor is cooked. so if i replace all 3 of those the amp should work again? and where would i even get ones to match? FETs would be the only component to produce the black residue when it fails. Resistors would show a burnt ring around it and the cap should be fine. It would be a great idea to replace all three. With one part failed, the others could be stressed. Looks like the FET shorted or blew. Look at the number on the other FETs around it and do a search on Digikey.com. Look up "resistor color code" to find out what value the resistor is. Or use a DMM and measure one of the other resistors. Look at the printed number on the cap and look that up as well although its probably fine. Quote This post sent with 100% recycled electrons. 2004 BMW M3Mechman 280A 2 - XS Power XP30001 - XS Power D375 500F of Maxwell SuperCaps (soon to be 1000F) iPadMini2Dash mounted O-scopeAudison bitOne (Remote DRC MP) Highs Amp - PPI Art A404 Hertz HSK130 (HSK165 waiting...) DC Audio DC9.0K 2- DC Audio XL12m2LEGAL - 147.3dB @ 41Hz OUTLAW - 150.2dB @ 45Hz OUTLAW - 145.7dB @ 30Hz JUNE 2014 SOTM WINNER 2014 COLORADO PEOPLE'S CHOICE WINNER SOTM BUILD:http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026 Link to comment Share on other sites More sharing options...
Wicks Posted November 6, 2011 Report Share Posted November 6, 2011 Not to rain on your parade, but the FETs should probably all be replaced... Different lots of FETs could have different series resistances. More current will flow through the least resistance, so if the new part has a mis-matched resistance from the others then it could blow again... Quote This post sent with 100% recycled electrons. 2004 BMW M3Mechman 280A 2 - XS Power XP30001 - XS Power D375 500F of Maxwell SuperCaps (soon to be 1000F) iPadMini2Dash mounted O-scopeAudison bitOne (Remote DRC MP) Highs Amp - PPI Art A404 Hertz HSK130 (HSK165 waiting...) DC Audio DC9.0K 2- DC Audio XL12m2LEGAL - 147.3dB @ 41Hz OUTLAW - 150.2dB @ 45Hz OUTLAW - 145.7dB @ 30Hz JUNE 2014 SOTM WINNER 2014 COLORADO PEOPLE'S CHOICE WINNER SOTM BUILD:http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026 Link to comment Share on other sites More sharing options...
meade916 Posted November 6, 2011 Report Share Posted November 6, 2011 call Rockford and see if they can fix it. You have no idea what you are doing and are going to mess it up worse then it already is. If RF cant do it, find a reputable company that can. Quote All SMD products + MORE available at my store here! https://wccaraudio.com/ Subscribe to My Youtube Channel! Over 1,000,000 subscribers strong! Turn on your notifications! http://www.youtube.com/meade916 Follow My Instagram! Daily live feeds from the shop, exclusive content way before it hits my Youtube channel...and little squares with photo's in them http://www.instagram.com/meade916 The Official SMD Facebook fan Page https://www.facebook.com/SteveMeadeDesigns/ Follow my Tweet (Twitter) http://www.Twitter.com/meade916 Link to comment Share on other sites More sharing options...
fox_racin4 Posted November 6, 2011 Report Share Posted November 6, 2011 call Rockford and see if they can fix it. You have no idea what you are doing and are going to mess it up worse then it already is. If RF cant do it, find a reputable company that can. X2 Just cause you can only see those 3 parts blown Doesnt mean thats all FETs should all be replaced in thst section Quote 1998 gmc extd cab 12 crossfire C710s 4 SAZ-4500s 3 Singer 400A altsbuncha mids/highs Team Asshole Link to comment Share on other sites More sharing options...
homiewes Posted November 6, 2011 Author Report Share Posted November 6, 2011 I was planning on calling rockford on monday. I just want to know why this happened to my amp.. what causes a MOSFET to get cooked? i never had a problem with this amp till i ran its first 1ohm load in my new car.. Quote My youtube channel, please subscribehttp://www.youtube.com/ballinblaza Link to comment Share on other sites More sharing options...
fox_racin4 Posted November 6, 2011 Report Share Posted November 6, 2011 Hard to say what caused it till you start "opening it up" and looking at other componets Quote 1998 gmc extd cab 12 crossfire C710s 4 SAZ-4500s 3 Singer 400A altsbuncha mids/highs Team Asshole Link to comment Share on other sites More sharing options...
corrie32 Posted November 6, 2011 Report Share Posted November 6, 2011 what does your electrical look like??? Quote i love this sh--t man 1966 Ford Fairlane Pioneer prs 80, the big three, with 2 big azz agm batts, dual 270/200 amp alts , two 8'' mids and tweets in the kick( PPI phantom 600.2). two 10''s and tweets in the doors, two 10'' mids and tweets in the rear decK ( Lanar opti 500x2). 2 C2 Audio Threatcon 4 12s on a Crunch GP3000d. No crossover . Link to comment Share on other sites More sharing options...
STEvil Posted November 7, 2011 Report Share Posted November 7, 2011 I was planning on calling rockford on monday. I just want to know why this happened to my amp.. what causes a MOSFET to get cooked? i never had a problem with this amp till i ran its first 1ohm load in my new car.. MOSFETs die from voltage drops and heat. Heat causes more resistance which means they use more power to put out the same amount of power as they were before. Voltage drop means they use more power to put out the same amount of power. Heat and/or voltage drop will rise as more power is used thus creating more heat/resistance/voltage drop and inducing a "cascading" effect until the parts burn out. One part can be weaker than the rest and go out first, but often if you have been seeing overly large voltage drops then more than one mosfet may be on the edge of blowing up or may have blown up. Quote MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..." Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through. Hammerdown... 1% no links to outside websites, business related FB/YT pages allowed. Link to comment Share on other sites More sharing options...
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