AUGIE Posted February 8, 2011 Share Posted February 8, 2011 My 8 year old KSW 12 finally died on me, I think. I'm not getting any sound out of it at all, and even the LED red light is not on. I pulled the fuse and it dosen't look fried, I checked the outlet and it is giving power. Even if it's the cable or the AVR shouldn't I still get the red LED light on? Any ideas? Thanks 1 Quote Link to comment Share on other sites More sharing options...
AUGIE Posted February 8, 2011 Author Share Posted February 8, 2011 Actually under closer inspection, the fuse does look like it may be damaged. 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted February 9, 2011 Share Posted February 9, 2011 If it's questionable, you can check it with an Ohm meter (DVOM). Quote Link to comment Share on other sites More sharing options...
AUGIE Posted February 9, 2011 Author Share Posted February 9, 2011 Thanks, I don't have one but I think i'll just buy a fuse and try it. When I tilt the fuse I can see little balls of metl rolling around. It's a werid fuse. 1 Quote Link to comment Share on other sites More sharing options...
AUGIE Posted February 9, 2011 Author Share Posted February 9, 2011 Anyone know a part number from Radio Shack or the like for the correct replacement fuse?? 1 Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted February 10, 2011 Share Posted February 10, 2011 If no one pops up with a number, you might call the parts dept. at Klipsch. Quote Link to comment Share on other sites More sharing options...
AUGIE Posted February 10, 2011 Author Share Posted February 10, 2011 I got the number and bought the fuses. Sadly as soon as I replace the fuse and plug the sub in it make a hum noise and blows the fuse within a second or two. Any ideas what could be wrong???Edit- I took the panel off to inspect everything, no burn marks everything looks brand new. All my research shows people with this issue but no one has posted solutions. I really don't want to send it off and pay 160 dollars to be repaired. 1 Quote Link to comment Share on other sites More sharing options...
05-Stage1 Posted March 3, 2011 Share Posted March 3, 2011 i have been having the same problem for a few days now. my sub worked for years flawlessly,i moved to my new house got everything hooked up and my sub did not come on. it only took about two fuses to realize there was a big problem. so as i always do i started googling solutions. it was kind of disapointing to realize that nobody that i had seen was able to fix the problem, they just replaced the whole amp. well in my case i believe the problem is the 470uf 200v capacitor. ive got a few ordered from electronicgoldmine .com. i didnt see the right ones at parts express. klipsch limits your space in that particular spot to replace this capacitor so it was somewhat hard to find the right size. when i get one soldered in i will def post results and let you know if that fixes it. im very confident though [] Quote Link to comment Share on other sites More sharing options...
roberthil5 Posted September 11, 2011 Share Posted September 11, 2011 Augie: Don't know if you still have your issue with your KSW 12, however I had the same problem with mine. I have some electronic knowledge and began isolating my problem. I found that my problem was the switching power supply. I had a shorted MOSFET on the board. There are 4 of them (all in line) on a black heat sink held in place with spring clips. I changed all 4 of them and was back in business. You need to know how to test a MOSFET, how to source the right replacements and have very good soldering skills so as not to damage the circuit board. Also, there are dangerous voltages on the board, so if you're not experience, leave it to a pro. But that is what cured my dead sub, now the wife is complaining again.... Quote Link to comment Share on other sites More sharing options...
ariansl Posted January 4, 2012 Share Posted January 4, 2012 I have the exact same problem with my KSW 12, can tell me where to purchase the MOSFETs so that I can make the same replacement on mine? Quote Link to comment Share on other sites More sharing options...
roberthil5 Posted January 5, 2012 Share Posted January 5, 2012 I do not remember the part number but I found them on eBay. I have been running the sub HARD since I replaced those power supply MOSFETS, with NO issues since. I did have to replace the power fuse (in the socket on the back panel) along with changing the transistors as the shorted MOSFET ate the fuse. There was no question the transistor was bad, when removed from the circuit it checked shorted, I replaced all 4 of them just to be sure/safe. Quote Link to comment Share on other sites More sharing options...
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