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Switching power supply still don't workafter changing the MOSFET

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Switchers can be funky to troubleshoot. can you hear or detect if it is oscillatiing? Check primary w/ a dvm set on ac The primary side of the circuit (oscillator) is probably shot if you don't get any readings If you are check the 2ndary side. Could be anything. These types of power supplies are very efficient, very stable but a pain to trouble shoot. Atny component in the oscillator circuit can shut it down cold. Good luck. Gary

Posted on Mar 14, 2009

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No power. I will open it to see if they have bad capacitor, but all capacitor is good


See the fuses and the input stage where there is a filter and a varistor. Check the rectifiers and the power supply. This is a switching power supply. You might want to secure a schematic before you do the troubleshooting.

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Will not turn on


Hi
This problem has two versions: no light at all or the standby light is on. Assuming the former, the fault may be one of the following:
1. Open fuse. Can be replaced.
2. Blown and blackened fuse. There is a short in the power supply or in its load mainly in the supply line.
3. Switching controller IC
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Sully

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Damaged fuses to turn it the TV is of little use sylvania 22' Lc220ss1


have you tried to replace the fuse? Most likely there is a short circuit on the front side of the power supply. If you have any electronics repair experience, I would check for a shorted diode, bridge rectifier, or switching mosfet. You may be better off replacing the power supply.

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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.

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1 Answer

It wont power on. sometimes it will and then just shut off right away. any advice?


Your problem is in the power supply section it could be an overheating component or defective switching MOSFET transistor or a leaky capacitor. Please don't over do, it may damage other components. An electronic service technician should handle the problem.

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Power supply HP-A3108F3P Line rectified voltage is good, 310 V. No output voltages, no voltage on UC3843, no oscillation. Switching Mosfet is ok. Need help, thanks.


That could be a problem on secondary side. Shorted rectifier diode.

Please do check start up resistor of uc3843, I think its on pin 7 with 110Kohms or 56Kohms value for 220VAC or 110VAC supply input respectively. Open or change value, it is a fusible resistor. If open do check other components for defects. Don't substitute a common resistor on this one. Datasheet could help you alot.

A word of warning, the voltage may bite and enough to kill. So take necessary precaution, if in doubt let the tech handle it. Or buy a new one.

Oct 18, 2010 | IBM HPA3108F3P 310Watt Power Supply

1 Answer

We've had ours for 3 years and when it no longer turned on we found the inside fuse blown. We put a new fuse in of the same rating, it goes right out too. What usually goes in the power supply to have the...


Hi, Sounds very much like the capacitors in the power supply have failed and stressed the switching regulator/mosfet/transistor and caused it to go short.Unless you are conversant with switching power supplies, be prepared to spend some money.

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1 Answer

HI I have a FSP200-61GT SPI switching power supply with a burned out Mosfet on the high voltage side. There is a (I think)a .5 or 1 watt resistor on both sides of the mosfet. But they test good, my problem...


Please give motr of the devices fixed on same heat sink. Search for SMPS IC like FPS or similar, search their application notes and the datasheet of the nMOS. then you can get idea. without those data Solution is impossible.

Jan 27, 2010 | HP and Compaq Pavilion Replacement 200w...

1 Answer

HI I have a FSP200-61GT SPI switching power supply with a burned out Mosfet on the high voltage side. There is a (I think)a .5 or 1 watt resistor on both sides of the mosfet. But they test good, my problem...


I think it's usually about 820 - 1K Ohms... It;s the emitter resistor.In saying that we generally don't repair these SMPSU's anymore as they are so inexpensive these days like NZ$45.00 for a 350 Watter. Also 80% of the time the repaired supplies fail again shortly after due to the stress put on the other components, by the initial problem.Good luck.

Jan 27, 2010 | Computers & Internet

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