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I have brought a XD-7258 MOSFET 60wx4 all in one car entertainment system and there is power going through the iso lead to the unit but no power ... help please?

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Posted on Jan 02, 2017

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Yes, It does.

Posted on Feb 15, 2009


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How do you open the face of a Mosfet 60wx4 Pioneer Car Stereo without power to the system?? Can someone please help!!! Glen

if you could open the top cover look were the face gears are,you should find a motor which controls the movement of the face..give it direct 3 or 6volts should get the face to flip...

Jul 05, 2016 | Pioneer Car Audio & Video

1 Answer

I have dell inspiron n5030. The power adapter light turns off when connected to laptop and hence not charging the laptop.

Bad Power MOSFETs.

Using the HP Pavilion dv6000 and Pavilion dv9000 series Notebook PC's, for an example,

General example of the -> package type, of the Power MOSFET/s used,

The 'legs' (8) on the sides are Leads. This particular style is known as a J-lead.

Using the Fairchild Semiconductor International - Power MOSFET - FDS6679 as an example,

$1.01 USD

Another component that may go bad are the Ceramic Capacitors, and near the Power MOSFET/s.
Looking at the first link, Mayohardware, look down at the second photo. AO4407

To the right of the Yellow circled AO4407 Power MOSFET, is a Ceramic Capacitor. Small rectangular shape with a wide dark band in the middle.

They burn, bubble, and blister just like the Power MOSFET's do.


Oct 08, 2012 | Dell Inspiron N5030

2 Answers

Power up problem with alesis rs300 (ra300)

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.
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 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.

Sep 09, 2009 | Alesis RA-150 Amplifier

1 Answer

I have an XD-7258 The navigation doesn't start it goes strait to calibration screen. Can you help me??

Try looking in the menu, as there should be something there to decide which screen appears as the default screen, this is just an idea sir as I don't know too much about sat-navs

Jun 12, 2009 | Car Audio & Video

1 Answer

I realy need help, pleas!!!

Your problem may be in your input rca connections not getting proper contact or in the wrong way , if the input is not rca lead and is hi end input,as in wireing off the back of your head unit to the amp it may be a short in the wireing, you will need to check all your wiring if so, also make sure all your earth leads are clean and are big enough to take the amp size.

May 27, 2009 | Lanzar 2H 1000W MOSFET AMP Car Audio...

1 Answer


Yes, It does.

Feb 01, 2009 | Televison & Video

1 Answer

Need Instructions to use !!

Go to station you want and if it has numbers 1 thru 6 for example hold number you want to store at. Should blink then stop or mute sound for a second.

Aug 22, 2017 | Car Audio & Video

2 Answers

Sentrek car amplifier

The remote turn-on wire for an amplifier connects to a switched power source. If the head unit has a power antenna lead, or amp control lead, use it. If not, the remote lead can go to a power source that is switched with the ignition key. No matter the source, you need to fuse the wire with a 1 amp fuse at the point where you connect to the power source.

Oct 22, 2007 | Car Audio & Video

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