Need the mosfet number for the power acoustik a3000db

I guess your power supply got fried, Mosfet power supply that should has a Mosfet part number IRFZ44, or HFP50N06 type, also you will have to check power output devices for shorted outputs, hope it helps...

You will need a service manual to get the correct part number, I tried to cross with my NTE data base no luck, went into ebay site punched in the original numbers came up empty.

Possible that when the MOSFET'S were changed the Switch mode oscillations were not proper and so the drivers were driven too much to fail.
It will be best to replace the whole power supply if the mosfets are heating up more than required.
Also replace all the electrolytics and check the SM transformer after the mosfets are replaced and before switch on. Check also the load on the output , if there is any short or leakage on the drive output .

hi,
your monitors horizontal deflection side have some problem. you have to check the horizontal width cotrolling transistor mounded on the aluminum heatsik near the lot( line output transistor). also check the three mosfets which adjust the width for different resolutions. there are three such mosfets in the horizontal section.

fist of all replace the width controlling transistor in the heat sink. photo of mosfet and transistor is added for reference. not the exact number.
ok

no, check your speaker wire inside sub box check your ground wire and you might need to wire your subs in series

you have more than likely damaged some transistors.
the resistors have burned because of excessive current.
there are 2 typesof transistors,bipolar and mosfet
a bipolar transistor has 3 pins.1) base 2)emitter 3)collector.
an NPN is tested with the + meter lead on the base , and a PNP transistor with the - lead on the base.
TESTING
base to collector should read .5 to .6 v drop in one direction and open in the other with a digital meter on the diode check function.
base to emitter about the same,but slightly higher than the collector.
if base to collector is .5v then base to emitter is .52 or so.it is always higher than the base collector number.
between emitter and collector will read open in both directions.
if there is a short on any lead combination,the transistor is blown.
npn transistors operate on the positive rail power supply,and pnp on the negative rail.
typically a 150 watt amp will run + - 65vdc.
the transistors running on the plus side are npn and on the negative pnp.
most pnp output transistors are green.,but some are black,
so we must go by the numbers on the transistors, eg.A1076 is a pnp,B755 is a pnp and all transistors that have a C or D eg. D424 are NPN transistors. all A and B numbers are PNP and all C and D numbers are NPN.
MOSFET transistors have 3 pins 1)gate 2)drain 3)source
the source goes to power like the collector does. the drain is like the emitter,and the gate switches it on like the base does.
testing a mosfet is a different procedure.
a mosfet with k then a number e.g. k135 is a positive device like npn.
a mosfet with j and a number e.g. J50 is a negative device like pnp.
a mosfet reads open source to drain both directions.
for a positive (k number device) the plus meter lead goes on the source.,the black meter lead on the drain. on the diode test function.
jump a wire from the source to the gate for 1/2 second and remove the jumper while leaving the other two meter leads connected to the source and drain.The mosfet should switch on and the meter should show a short.that means the mosfet switched on.About 5 seconds later,the resistance from drain to source should go open.
for a p channel mosfet,it checks the same,except that the black meter lead goes on the source and gate .
a mosfet will stay switched on longer than the voltage applied to the gate,if it is driving a high impedance device such as a meter.
a bipolar transistor will not stay on when voltage is removed from the base lead.
i hope this has been of some help.

Could not get a manual for you but did get the follwing specs. Hope they help.

Power Acoustik Ov2-800 2-Channel Class A/B Gothic Series Amplifier (800-Watt)
POWER ACOUSTIK OV2-800 2-CHANNEL CLASS A/B GOTHIC SERIES AMPLIFIER

800-WATT 2-CHANNEL
4 ohm RMS: 150W X 2
2 ohm RMS: 180W X 2
Bridged mode MONO RMS: 360W
BRIDGED MAX: 800W
FULL MOSFET POWER SUPPLY
PWM CIRCUITRY
FULL SELECTABLE CROSSOVER
3-WAY PROTECTION CIRCUIT
TRI-MODE CAPABLE
VARIABLE LOW PASS 40 HZ - 120 HZ
VARIABLE HIGH PASS 150 HZ - 1.5 KHZ
VARIABLE 18 DB BASS BOOST @ 40 HZ
FREQ RESP: 10 HZ TO 30 KHZ
S/N RATIO: 98 DB
THD: 0.02%
2 ohm STABLE STEREO
SYSTEM DISTRESS INDICATOR
HIGH/LOW LEVEL INPUTS WITH FLOATING GROUND
4-GAUGE POWER/GROUND CONNECTION
PLATINUM RCA CONNECTORS
LINE OUTPUT WITH FLOATING GROUND

BLUE LED
CHROME TOP PLATE PANEL 2-CHANNEL CLASS A/B GOTHIC SERIES AMPLIFIER (800-WATT)

Hello luistecnico2,

Those cross-reference OK. Go to www.mouser.com and do a search on both numbers. You'll find that one of them was manufactured by STMicroelectronics and is currently obsolete. The other is manufactured by Fairchild Semiconductor and is available at a cheaper price than the original.

Hope this helps.

hafler use international rectifier hexfets. there is alot of confusion what constitutes a mosfet amplifier.
if the outputs are mosfets instead of bipolar transistors, it is a mosfet amp.
some designs are using mosfets to drive the switch mode power supply,but use bipolar output transistors.that is not a true mosfet amp.
you need to go to an electronic supplier for the repair industry.
or the manufacturers warranty depot,who will be able to order them.mosfets are very high current devices,you have to ask ...why did they fail. if they are the switch mode drivers,there is bad capacitors in that circuit

Broken legs on the rectifiers or an intermittently shorted common mode inductor would be the likely suspects. The common-mode inductor is just to the right of the capacitors in the photo. Install a single 15 amp fuse in ONE of the 4 fuse holders (other 3 fuse holders empty) and power up the amp. Twist the inductor to see if the amp draws excessive current (which would blow the fuse) or to see if it sparks.

Let me know if you have any other questions.