Question about Panasonic Electronics - Others

1 Answer

Switching power supply still don't workafter changing the MOSFET

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 21 Answers

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

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

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.

Mar 16, 2014 | Chi Mei Corporation CMV-633A LCD Monitor

1 Answer

Will not turn on

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
4. Switching MOSFET transistor and its associated circuit.


Sep 20, 2013 | Insignia Televison & Video

1 Answer

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.

Oct 07, 2012 | Televison & Video

2 Answers

Eee pc x101 won't charge

You need a new AC charger the wires wear out very often with constant plugging in and out im on my fourth one.Buy the full charger and cable.Ebay less than a tenneerr

Aug 17, 2012 | Asus Notebooks Asus Eee PC X101CH-EU17-BK...

1 Answer

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

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.

May 26, 2011 | Samsung LN40C550 TV

2 Answers

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.

Mar 17, 2010 | Philips Magnavox MWR20V6 DVD Recorder/VCR

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

Not finding what you are looking for?
Electronics - Others Logo

Related Topics:

119 people viewed this question

Ask a Question

Usually answered in minutes!

Top Panasonic Electronics - Others Experts


Level 3 Expert

4943 Answers


Level 2 Expert

224 Answers

Rob Wheeler

Level 2 Expert

130 Answers

Are you a Panasonic Electronics - Other Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides