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Sumo Ulyesses transistor amp mosfet.

Amp hums loudly in use, checked visible connections and cant find problem. Would one or more components cause this problem?
thanks pw

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Stick headphone jack in and check psu for mains ripple. If so check capacitors.

Posted on Sep 08, 2008

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I have a Denon PMA 500V amplifier. all of the output fuses were blown so I replaced them but the unit still doesn't work. Any suggestions?


hi.
Did you checked balanced impedance?load speaker impedance vs PA output?or PA might over driven,causing a trouble on the pre-amp to power amp circuits and components damage,
need to recheck related components on the pre-driver up to main output section,

Note: That,blowing of fuses with the same rating is an indication of trouble/shorted in a circuits that driven on it,

Thanks and good luck

microhit

Jun 01, 2011 | Denon PMA-2000R 2-Channel Amplifier

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Hooking up the amp i had the ground wire connected and was going to hook up the power wire and it hit the case of the amp know the amp turns on but there is no sound from the speakers other amps work on...


sadly, your amps' output MOSFETS are more than likely toast.

your amp was grounded, and you touched the amp chassis with the power line.
electricity will follow any path available to find ground. in your case, the output mosfets became your main ground-path since they are directly connected to the amps chassis (heat sink) and internally you had grounded the amp so power would flow full force through the output transistors in the serach for a ground.

open up your amp and smell the row of MOSFET transistors. you'll probably even be able to see some burnt transistor legs.

repair or replace.

May 08, 2011 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

I have a ct312 inverter tig welder and the abnormal pilot light has come on and ive been through what it says in the maintenance book but has not fixed it. the book says there must be something wrong with...


i can't tell you what's wrong with your machine but i can tell you that a MOSFET is a 'metal oxide semi conductor field effect transistor'. So, it's a transistor, probably a biggish one that handles the power of your cutter/welder and maybe possible to replace without soldering.
i have heard that a lot of these chinese machines suffer from loose connections so it may even be a loose connection to a component rather than a faulty component.
by the way, is it any good when it's working? i am interested in buying one for myself.

good luck.

Feb 09, 2010 | Electronics - Others

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I have a beringer 5000 mixer and can not get no sound from it. it's like the speakers are not getting power


Oh, oh... got one on the bench now... There is a design defect that causes a short and destruction in the power amp portion.

Do a test: Plug headphones into the main 1/4 inch jacks. The sound won;t be very loud since these are line outputs, not for headphones.

IF you get sound out those, then one or both power amps are dead.

Worst case: if one amp is dead, several parts including three power MOSFET transistors are fried for any of the dead channels.
The failure of the amp can wipe out the main power supply. If you effect windows light up, then the small power supply is operating.
If the big supply is fried, there are two large MOSFET switching transistors that are gone. Often several smaller transistors and dides and resistors and one switching IC goes. MOST of these are surface mounted parts and would be beyond the scope of what you can repair.

I am trying to contact Behringer about the flaw but haven't heard back yet.

The nature of the flaw is this: The is insufficient clearance on an internal circuit layer from the edge that fits into a slot in the power amp heatsink. Any humidity that enters can cause the insulation to breakdown and arc to the heatsink causing a chain reaction.
I repaired one of these already before finding the cause, but this one had a smoking gun! I just yesterday milled out the slot deeper and wider and will put insulating tape to prevent further arcing. The arcing that had occured burned away the internal layer and the connections. I will replace thoose with hardwire.

Repair of this problem is time consuming to weed out all the blown parts and to safely bring the unit back to life.

The current unit I am working on took out ONLY the power amp. A 30 milliohm resistor went up in smoke making a real mess. All three power MOSFETS are gonzo and a zener as well... don't know what else I will find. The previous unit was worse as the power supply was wiped as well.

Feb 06, 2010 | Behringer Pmp3000 16 Channel Audio Mixer

1 Answer

Need mosfets for hifonics amp sfp50n06


That is a Semiwell part I believe. It is an N-Channel power mosfet. Go look on their website they may have an alternate part you can use.


Dec 18, 2009 | Hifonics Brutus BXi 1206D Car Audio...

1 Answer

Humming noise when amp is powered on.


check the heatsink, touch it with your finger feel it ,if you can hold it with in 15 sec, then your power amp. component might be working if not then probably you Power Amplifier IC or transistor is shorted.

May 31, 2009 | Infinity BASSLINK Car Subwoofer

1 Answer

Transistor number used in ARC classic 60 amp.


Try RS Components under transistors. they have a web site that is easily searched.

Mar 18, 2009 | Audio Players & Recorders

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T1500-1bd burnt mosfet


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.

Feb 08, 2009 | Audiofonics ADF-243 Car Audio Amplifier

5 Answers

Horizontal output transistor keeps failing


The horizontal output transitor is always connected to the primary winding of the flyback transformer (via collector) and also to the horizontal deflection coil via an electrolytic capacitor. The most likely suspect for damaging the transistor is the fylback transformer. In some countries there are electronic stores that test flyback transformer by winding a few turns on the ferrite core and applying a test voltage. This test will only test the secondary. The primary winding is difficult to test for turn to turn short because the resistance is quite low and you do not know the 'good' resistance.

May 15, 2007 | ViewSonic E70f 17" CRT Monitor

1 Answer

Protect LED on


this is a basic procedeur just look for any short between pins of each component.

Apr 11, 2007 | Legacy 600 WATT 2 Channel MOSFET LA470 Car...

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