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What is a mosfet - Vizio P50HDTV10A 50 in. Plasma HDTV

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Alpine pdx-m12 blue light fiashing

If the blue light is flashing it means the output mosfets are taking more than what the power supply can deliver. Probably just one of the MOSFETs is bad. Take off the heavy aluminum bar that is the heatsink for the 8 MOSFETs. Turn it on for about 10 seconds. (And see that the blue light is flashing.) Find the (hopefully) one MOSFET that is hot. Replace it. And you're good.

Aug 10, 2012 | Alpine PDX-M12 Car Amp

1 Answer

Is there a device that I can connect to my inverter to keep it from shutting down due to voltage spikes from the vehicle?

Short of shutting the inverter off momentarily, there is not a simple answer. because you could slightly modify the inverter's over voltage reference IC, but that requires knowledge of the inverter that the manufacturer does not want you to know normally.

if you are running the inverter off a second battery, you could isolate that second battery from the system through any number of time delay relays, time delay circuits comparable to intermittent wiper circuits.

However, if you are capable with a soldering iron, MOSFETs can be utilized as a voltage variable resistor. They can be in a parallel array to increase current. You need to know what current draw is by the inverter with the normal load.

Once you know that current, you can select a MOSFET of sufficient "Constant Current" or pair of them and wire them as "Voltage variable resistor."

The circuit actually does work, the resistor is adjusted until you aproach the "pinch off zone" and tweak it to the point you want to operate with. The MOSFETs will need to be on a heat sink, any you can even wire a switch across them to short across them to remove them from the circuit. The image only shows one MOSFET, but they can be operated in parallel for more current capactiy. Which why the constant current rating of the MOSFET needs to be known. The type of MOSFET is not critical, it can be a trench fet, hexfet, etc. You should plan for double the current draw in your MOSFET selection for purposes of a design centered value. You can use up to about 5 MOSFETs from that one pot. For extra margin in the design you could add 0.1 ohm (2 Watt) resistor in series with each MOSFET to balance current through the MOSFETS, although MOSFETS will self equalize to a point. When they heat up their internal resistance goes up so thermal runaway is not normally an issue.


Jan 18, 2012 | Electronics - Others

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TV LOEWE 8784. Died SPP11N60S5 in the power supply. After replacement of the MOSFET the TV worked for a day then next morning it died again on a start. This way were killed 3 MOSFETs. What could be the...

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 .

Aug 04, 2011 | Televison & Video

1 Answer

SIR, I have a samsung lcd using mosfet

No,get the same mosfet IC.Mosfet dosen't function like a capacitor,capacitors up a litte voltage it no problems.

Mar 17, 2010 | Samsung SPN4235 42 in. Plasma HDTV

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A ups mosfet ckt one mosfet burnt out og 16 can i replace only one

Usually the mating one has been degraded or damaged as well. Replace as a pair, or all of them that are in the same function.

OFTEN driver transistors and drive diodes are also damaged. Carefully check all associated components to avoid burning out freshly replaced ones.

Mar 14, 2010 | Vector VEC 024 400-Watt Power Inverter...

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Mosfet check

1. Switch your multimeter to the Diode test position.
The following steps are for an N-Channel MOSFET.
Hold the Black lead to the MOSFET's source terminal.
2. Touch the GATE terminal momentarily with the Red lead.
3. Then touch the DRAIN terminal with the Red lead without touching the GATE terminal with your fingers.
The multimeter should show a low reading now. (The MOSFET is now ON)
4. With the RED and BLACK leads still connected to the DRAIN and Source terminals of the MOSFET, now touch the GATE terminal with your finger. The Multimeter should immediately show an open cct. (The MOSFET is now OFF)
This is a very simple way to test a MOSFET.

Jan 13, 2010 | Epson >>> IM800 DARK GRAY 733 MHZ CPU...

1 Answer

Blown ps3 mosfet

this should have all the specs you need. i have the same issue and have spent days searching and found this. hope this helps

Dec 17, 2009 | Sony Playstation 3 (PS3) Console

1 Answer

Trying to find the right FET to replace burnt up ones with

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

May 23, 2009 | MTX Thunder 5-Channel Amplifier 895 Car...

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Mosfet in my asus motherboard burnt out,

Better to have the motherboard replace, do not wait until some other components might be also damage. Commonly mosfet is use in power supplies regulator. It can kill your processor and memory.

And also check your power supply. It might also having problems.

May 02, 2009 | ASUS P4GE-MX Motherboard

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