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Power supply main and secondary fuses value and rate

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5A for primary and 3.75A for secondary; we've used 4A there as well and frankly even 5A as well won't make much difference.

Be advised that when those fuses are blown you have a bunch of other things to replace on the board as well and unless you do them all there is always risk of a repeat failure. I am reminded about it once or twice every month :-)

Unelss you are a seasoned professional my advice is that you do not try to replace a power failure that resulted in both fuses being burned and let others do it for you:

Posted on Jan 30, 2014

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How do i build a 12vac 2a adapter step by step.

Just get a transformer with a 12 volt 25 VoltAmp rating on the secondary and a primary suitable to your mains power in your part of the world. 120 VAC 60Hz for continental North America. for example.

Put a power cord on the primary with a suitable switch to shut it off, and the output of the transformer will provide you with the 12 Volts AC at 2 Amps output. Attatch the suitable adapter to the end of the secondary wires, and you are all set. AC does not have a polarity like DC.

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How do you change the fuse on lv-s3 cannon projector

The main fuse is on the power supply unit/section and so you need to remove the main panels to get access to the power supply. Normally if the fuse is blown the chances are that the SMPS- swittch mode power supply - has failed and so you might need to replace or repair if the components failed is within limit.
please check this link for tips:
Replace the fuse only with the rated value. Before the projector is opened, the lamp must be safely removed and kept aside, Take all precaution not to touch with bare hands and to replace back into the holder with care.

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1 Answer

Having trouble turning my Tv on,have to turn it on and off/plug and unplug for a while to get pic and sound.Can you help?

Good day!

The problem of your TV could be the power supply.

Please follow this steps on how to fix that problem

  1. Remove the back cover of your TV.
  2. Try to look at the power supply board (it usually directly connected to the power cord)
  3. Plug-in your TV and power it ON to perform a voltage data.
  4. Check the input voltage of the power supply.It should have 110vac or 220vac it depends the input voltage of your TV that comes on the outlet.Use multimeter tester (range in AC)
  5. If the input voltage of the power supply doesn't have a reading,the power cord is defective you need to replace it.
  6. If the input of the power supply have 110vac or 220vac.Please check the output voltage of the power supply using your multimeter tester (range in DC).Normally it should have 5vdc for the system board,12vdc for the audio system and 24vdc for the inverter board (back-light).Also look for the leak/bulged on the top capacitor.If any replace it with the same type,ratings and value.
  7. If the you have done all procedures above and you have found any defects and the output voltage are complete.The problem could be the the system board or main board of your TV.This is not for D.I.Y because the parts are surface mount and its very sensitive.If the problem is main board you have to replaced it,buy a new main board its available at the market.
  8. When the output voltage of the power supply doesn't have reading,please check the following
  • Fuse---look if it is busted
  • Power transistor----If it is shorted (range in diode test)
  • Resistor----If it is open or change value (range in ohms)
If you found any defective parts replaced it with the same type,ratings and value.

I hope this solution will be helpful.Thank you and good luck.
Don't forget to rate my answer thank you.

May 09, 2011 | Televison & Video

1 Answer

What are the volt fuses for RCA RS2620? I mean like 150 volts fuses or 200 0r 250?

That would depend on the mains supply of the unit in question. If it has a 250 volt mains supply use a 250 volt fuse. However the crucial one is the amp rating. If it was a 300ma fuse installed a fuse no greater than that should be used. If it was a 2amp fuse a 1.5 could be used, but not a 2.5. Many fuses are fitted with a 250 volt rating in areas where it would never go higher than say 50 volts, such as in the secondary winding of the transformer.

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1 Answer

I need a psu for a Cambridge Audio Azur 540P phono preamp

any stepdown transformer rated 12V secondary with at least 0.5A rating would do (12V, 500mAmp). I know they said to use only the supplied power unit but hey that's business! but make sure whether your mains supply is 110Vac or 220Vac.   

Mar 11, 2010 | Cambridge Audio Azur 540P Amplifier

1 Answer

Red light flashing, no picture/sound!!!!

HI, this unit has 3 main fuse links on the main board that may be blown. the fuse links should be check before you move further into the diagnosis stage. once you have checked the fuses and they are still in a working state, this will confirm a power supply board failure. this board provides and regulates the current flow and distribution of it throughout the entire unit. If the fuses are fine and the power supply board is damaged, the green light will come on briefly then, the main control will notice that the power supply is not functioning properly. Once the main control board senses an abnormal current, it will shut down the TV rendering the red light warning. The list of fuses to check are below. Remember, if they are fine and working, the issue will be the power supply board itself and, it will need to be replaced.


3A 12v- fuse----(242208600623)
SM 3A 125v-fuse----(242208600657)
500 MA-fuse-----(242208611092)



Please rate and god bless:)

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1 Answer

BenQ FP767 17" LCD Monitor Problem - Power LED Blinks

Look for small power transistors 2SC5707 near yellow invertor transformers which go to backlight connectors.
But if problem is blinking power LED powersupply capacitors maybe an issue,check visualy and/or replacement.
Also fuse that maybe blown is not glass fuse near mains socket,It is semiconductor black or yellow colour labeled PFxxx near heatsinks of power supply secondary.

Please rate the solution and provide feedback.


May 25, 2008 | BenQ FP767 17" LCD Monitor

1 Answer

Audiovox PVD80

The UK has a standard mains voltage supply of 220 to 240 v AC. So you need a 240 v in to 12v DC out regulated power supply, probably require a secondary current of 2.5 amps. Just be careful that the connector polarity is wired correctly. Farnel /cpc sell the adaptor linked below in the uk [phone to order- pay by credit card] which looks good value and will probably do the job:

Link to power supply

Please rate my assistance - I hope it has been useful.

Dave ...London UK

Mar 20, 2008 | Televison & Video

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