Question about MSI K9MM-V Motherboard

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Fan move but, no display, every mosfet of vrm section are ok,input coil give 12vlt but output coil does'nt give any volt

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Not sure what you mean exactly, but try changing the PSU if there is not voltage from the power rails

Posted on Dec 29, 2010

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Posted on Jan 02, 2017

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How to fix sony 29'' wega, using irf 614 mosfet. mosfet is short


Check all the other component on board, associated with this MOSFET cirlcuit. Especially shorted zener diode, capacitor/s etc: Never replace an other FET, without check all the related component. It too will fail. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.

Nov 17, 2015 | Sony Televison & Video

1 Answer

Processor not heating


Check 12 Volt Motherboard VRM Section, Next Checek VRM Upper Mosfet or lower Mosfet one of them may b short.

Mar 08, 2012 | ASUS P4P800-MX Motherboard

1 Answer

Power supply circuit boards,gives only 2.0 volts


OK, what is the input voltage? I will give you a ruff diagram here. (volt in) Vcc--sw's-on/off/IR-control board (microprocessor)---ccfl (cold cathode fluorescent lamp) inverter (changes DC voltage tow switching DC (such as on/off/on/off/on/off but at a much faster pace (20Khz)---toroidal coil (this coil will step the switch DC voltage up to about 1000 to 1500 switch DC volt, then this coil will change the orientation of the voltage to current relationship by shifting the current by 90 degree's where it lag the voltage---this process has some changes on circuit and how it works)----OK, from the ccfl inverter------voltage multiplier (all this some HV capacitors and HV diodes hook up an configuration where each stage will double the voltage that go into... EXAMPLE: 4 stage voltage multiplier for each stage now it double the voltage 1500V input to 1st stage--output to 2nd stage 3000V output to 3rd stage 6000V out put to 4th stage 12000V switching DC, they will also refer to this voltage AC voltage because AC switch to from - negative voltage to + positive voltage.


Like in you case, the two volts from the controller to ccfl. Out put volt from ccfl with be around 2.4 to 2.6 due capacitance discharge, Now this voltage will be divided in the ccfl by two input windings (I am not going to explain this). Now the two input winding will induce voltage to the secondary winding (step up). The output from secondary of toroidal coil will be multi switching to the voltage multiplier. Probably in the neighborhood of 1500 switching volt. How many stages the voltage multiplier has I don't know. The ignitier voltage to the cathode from the multiplier would be around 12000 voltage to get image intensifier tube to fire. stewbison

Feb 09, 2011 | Quest ITT Night PVS-14 Gen 3 Night Vision...

3 Answers

Motherboard not powering up


hi this is parveen

solutiom for d845gvsr not poweringup only led flashing--

short pin 92 and 93 of smsc LPC47M172 with fine tip soldering iron .
pin 92 is nrsmrst signal that is 3.3v at time of working m/b when this signal is low than motherboard not powering up so we short pin 93 that is standby (3.3v) and motherboard powering up again and working properly this problem doesn,t come again in future. this solution is 98% working 2% chances to change the chip.

Aug 07, 2008 | Intel Motherboard

1 Answer

Your solution re motherboard


"voltage regulator module" thats have next to core voltage connector it's supply to cpu
cpu need 2 volt 45 amp and our power supply can produce voltage 12 volt 3 amp so motherboard can produce more amp for cpu . 6 mosfet using for this process it's near by cpu

Apr 11, 2008 | Intel Motherboard

7 Answers

Intel motherboard 845gvs


intel 845 gvsr motherboard have two most problem

vrm circuit fail IC ADP3168 {between the cpu and core volt connector}
f7338 mosfet ic fail {between the memory slot and ide connector}

Feb 26, 2008 | Intel Motherboard

1 Answer

Ga-7N400E powerup problem


VRM Circuit problem found there
disconnect only core voltage connetor and power on motherboard
if motherboard on so confirm that your vrm circuit is sort

replace vrm circuit mosfet

Feb 23, 2008 | Gigabyte GA-7N400E-L Motherboard

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