Hi all,
I got this magic subwoofer with 6 x 8" elements inside it. It is equipped with 2 amplifiers inside both driving 3 elements each. I took a big risk and bought it defective but it was working at time of bying it. But hearing some noise when powering it up so decides to have a look inside. What i found was 70V dc coming from one of the amp at speaker output, so i measured all the elements coupled to this amp and luckily they looks ok (13.5ohm each).
There is some burnt components on the amp itself and a shorted output IRF4227 between S and D. It is 2 resistors and also a capacitor with signs on it. Should i also replace the driver IC IR2110s or could thisone be measured before putting a new pair of IRF4227 ?
I got this magic subwoofer with 6 x 8" elements inside it. It is equipped with 2 amplifiers inside both driving 3 elements each. I took a big risk and bought it defective but it was working at time of bying it. But hearing some noise when powering it up so decides to have a look inside. What i found was 70V dc coming from one of the amp at speaker output, so i measured all the elements coupled to this amp and luckily they looks ok (13.5ohm each).
There is some burnt components on the amp itself and a shorted output IRF4227 between S and D. It is 2 resistors and also a capacitor with signs on it. Should i also replace the driver IC IR2110s or could thisone be measured before putting a new pair of IRF4227 ?
Attachments
-
IMG_20231230_141954.jpg -
IMG_20231230_142004.jpg -
IMG_20231231_120915.jpg -
IMG_20231231_121227.jpg -
IMG_20231231_121232.jpg -
IMG_20231231_122610.jpg -
IMG_20231231_122622.jpg -
IMG_20231231_122630.jpg -
IMG_20231231_122636.jpg -
IMG_20231231_122642.jpg -
IMG_20231231_124321.jpg -
IMG_20231231_124333.jpg -
IMG_20231231_125102.jpg -
IMG_20231231_125435.jpg
I have a ML 1500X subwoofer that has the same amp board. Have you repaired yours? Mine has blown R65 and R66 resistors. I had a problem before with the same resistors I replaced them and now they have gone bad again. I don't know if it is a design problem or what because MOSFETs looked ok.
Hi Hacuelo,
I have not finishen repairing it Yet 🙂
What you must consider if there is only resistors to be replaced is all the small electrolytics inside it. Replace them with better type of quality caps.
I had to replace one of Mosfets an those Two resistors and Even the driver ic for mosfets.
I have not finishen repairing it Yet 🙂
What you must consider if there is only resistors to be replaced is all the small electrolytics inside it. Replace them with better type of quality caps.
I had to replace one of Mosfets an those Two resistors and Even the driver ic for mosfets.