Amp started smoking from Mosfet irfp064n transister when turned on, no power!
I just got this used Visonik V800XD and when I applied power the power light came on and then I saw smoke and of course power light went out.
I opened the amp up and saw that someone had replaced one of the Mosfet irfp064n transisters ad it looks like it was burn.
I applied power again with a different 12 power supply with a reset and I saw a slight flash of the power light and the reset tripped and I saw a little smoke from the transister.
What could be the problem, should I get another transister and solder it in? Is it worth getting fixed or ask for my money back?
Any help appreciated as I would love to get this amp up and running.
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First of all is the mosfet your talking about in the output section or in the power supply section? Most car amps use mosfets in the power supply section, some use them in the output section. To test the transistors in your amp, take a digital volt meter and set it to diode check. Then take the leads and put them accross the first and third legs of the transistors. Usally the red test lead on the first leg and black test lead on the third leg of transistor. If you get a reading of 000 then transistor is shorted. If you get a reading below 600 then transistor is on it's way out if not allready or it's next to a shorted transistor that is it's complimentry output transistor. comonly you will have 2 transistors working together, one NPN and one PNP per a channel, or 4 of them in a bridged type output circuit depending on the watts and how man channels your amp has. I was just looking at the specs of this amp and it's got me confused. It says it's a 2 channel but looking at all the info on different pages it says at 4ohm:200wattsx4 and at 2ohms:300wattsx4 and 1 channel mono 600watts into 4ohms. weird for a 2 channel. anyway that is how you test your transistors. Same way for the power supply section but, you will come accross a couple or more switching diodes that look like transistors and you will get a 000 reading when you test those like I specified. They rarely go out and most of the time there is only 2 of them. They will have a diagram like a diode on the front showing you which way the power flows. Let me know what you find out. Your amp should have went to protect mode if you smoked a mosfet.
Depending on which circuit the IRFP064N/mosfet was in then you either have a blown output section and you will need to look at the other mosfet's that work with the one you replaced or if it is in the power supply area then you will need to check the other mosfet's that work with it in the power supply. Of course you will have to test all the driving circuitry that is associated with either output or power supply, which ever is involved and be sure that the driving voltages are correct. Of course, in the power supply it would be a high frequency square wave of about 50% duty cycle. A schematic would probably be of great help. Good luck.
The IRFZ46N are n channel high speed switches . They basicly drive the Mosfets. Sounds like you have some problem there my friend, and unless you paid alot for this amp. Its going to need probobly all the n channel switches as well as every mosfet + the bias resistors repalced. Before plugging in the amp jump out the fuse with a 100 watt light bulb.. If the bulb glows brightly when you apply power there is still a short in the unit and could be in the switching power supply section of the amp. If it glows bright and dims, The shorts are most likly gone. The bulb will minimize the amount of current the unit can draw and most of the time wont let the new parts blow out. Check out this service number and see if they can help you. Good Luck Main support number 978-823-0300