Kole KX1-5500D in protect mode. Shorted diode? - diyAudio
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Old 10th February 2010, 12:37 AM   #1
diyAudio Member
Join Date: Feb 2010
Location: Minnetonka, Minnesota
Default Kole KX1-5500D in protect mode. Shorted diode?

This car audio amp was in my car before I got my 2 AP30001D's. I was shredding CD's with the port on my box. (If you dont know what I mean, youtube it..) Anyways, a piece of the CD film managed to make it's way to the circuit board and short out something on the amp. I heard it go pop and a little bit of smoke. The Amp instantly went into protect mode.

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I took the board out of the heatsink and desodered diodes D325 and D326. On diode check mode with the multimeter, they allow current to pass both ways... I believe the CD piece allowed a capacitor to short to the diodes.

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I was wondering if there are any other components you guys think I should remove and test that might have also been affected.

FR104 Datasheet

Thanks in advance for helping out! Im a noob at this.
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Old 13th February 2010, 03:14 AM   #2
diyAudio Member
Join Date: Feb 2010
Location: Minnetonka, Minnesota
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Old 13th February 2010, 01:41 PM   #3
baga is offline baga  Romania
diyAudio Member
Join Date: May 2005
I think that the burned components are rectifying the power supply for the driver of high side mosfets.Try to connect a power supply between vcc and vppd,12 to 15v,floating, - to vcc ,+ to vppd .Use a 100 ohm resistor for current limiting..If the amplifier is working,you can change the diodes.If the amplifier is not working you may have other damaged components,probably in the driving stage for mosfets.Please note that i am not 100% sure about what i 'm saying.
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