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I have found power card of Del In1930f defective, after further checking I have found mosfet A2764 burnt and 1NN801B ic of driving card burnt, please help how to fix this problem.

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It is considered unsafe to attempt a repair of a power supply of that design. It will probably cost less, than the parts and expertise, to replace it.

Posted on Dec 17, 2016

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Posted on Jan 02, 2017

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Behringer B1800D pro, I have an active bass which won't power up on the board. There is 77v, 0v, 77v on the output rail. The DC rail is fine and I can't see any marks or unusual component faults. Any...


I had similar problem on mine It would try to power up and then cycle off and on.. I found Mosfets shorted.. T11 and T7 irfb4227 on P0981 pcb. This is a blue color pcb, not the power pcb, at least in mine. Also The Gate Drive IC Was bad irs20955 IC11. Failure occured in steps.. At first the unit was working, but only putting about about Half power. ( Looking at the design of this power amp, it looks like they have 2 parrallel Class D amps that drive the one speaker, so my guess is one side was still working until the FETS on the other side shorted causeing the Protection to kick in) Then it failed completely. I assume the gate Drive IC went out first, on the one side. then that caused the FETS to be on all the time and burnt them up as well. Just a guess.

Aug 30, 2013 | Behringer EUROLIVE B1800D PRO Active 18 In...

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Sir I have a DELL desktop CRT monitor which model no is E772p.It is not working .I opened the monitor and checked. I found that switching mosfet was short in power supply.It was taken out from the...


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.

May 02, 2012 | Samsung SyncMaster 793MB 17" CRT Monitor

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Tally Printer the error is some times Hammer


In the T6215 Maintenance Manual the fault message: Hammer Voltage has been replaced, in the T6218, with:

Hammer Voltage 1
There is a new fault message for the T6218. It is:

Hammer Voltage 2
Explanation: A high resistance coil fault has likely occurred in one or more of the hammer coils
Note: This fault message will have been preceded by printing slow-down attempts associated with On-The-Fly thermal monitoring of hammer bank temperature.

Corrective Action:
Check the hammer bank for defective hammer coils.
Confirm that hammer drive board is functioning properly.

Apr 05, 2010 | Tally T6218 Matrix Printer

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My acer Aspire 5100 has power with No video display, how do i fix this problem?


kindly remove thr ram and clean it and install it again.
Hope this helps. Please rate my response.
Thanks.
Have a good day.

Mar 23, 2010 | Computers & Internet

1 Answer

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...

1 Answer

When you try to turn the tower on the fans start up but nothing happens it just has one long continous beep.


probably itz either minor case of improper ground..
or major case of faulty or defective main board/RAM/addon/daughter cards..

..plz do check the following as in order:..
the Hardware part:..
1) see if the ram(s) is loose/faulty..open clean/remove carbon & or oxide formed on the teeth with an eraser n resit it..or replace with a standby n see..

2) on main/mother board..see with a debug card for mb error..may b short..look for defective capacitors(espabove1000mfd)/mosfets..go through the mb's south bridge n the circuit lie around atx connector..the crystal clock generator (if cpu isn't heating up)..

3) remove/clean dust neatly..dust is non-uniform in nature n may cause jam/short circuitry/excess resistance n many more..resulting an increase in heat..

4) unplug mains supply..pick open/remove the cmos battery..check (above +3v)..resit..

5) [in case of desktop] the smps itself may b defective/faulty..check the outputs of smps viz. 0v (black~ground); +12v(yellow); +5v (red, green~ps-on, violet~pg& grey~sb); -12v (blue);-5v(white); +3.3v(orange)..the 'oscillator and error amplifier ic',or pwm switching regulator circuit..look for defective protector-transformer/resistance (esp 4.7k)/mosfet..
check the battery n adapter [main power], in case of laptops..

6) see if ur hdd is noisy or emitting any 'ticking' noise (like 'tuk tuk' or 'kirr kirr')..or ur hdd is likely to b replaced..

for any further assistance u may plz leave comment and or testimonials at any point of time, so that i/we can help or u think it to b helpful..

if u r not a professional, always better to seek advise from ur system admin/vendor....

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1 Answer

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

4 Answers

MA2 laptop, not charging battery, changed burnt 4407 chip, no LED now.


This unit had a RED CHARGE error. Replaced PQ38 solved the problem.

If you get an error on the charge circuit after replacing the PQ38 you should also replace PQ38 because it too may be blown. Make sure Pin 1 where the dots. Also check the MOSFET on the other side of the COIL too.


29cb90d.jpg

Oct 08, 2008 | Gateway MX6030 Notebook

1 Answer

Sony DVP SMPS unit fault


Hello,
You can get complete power supply as one part from Sony. You can't repair it on component level because components are not available.

Jul 18, 2008 | Sony DVP-NS575P DVD Player

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