fuse question

[Undead]

When replacing fuses in monitor power supplies, should you use the slow-blow kind or the normal kind?

[Alup]

Re: fuse question

When replacing fuses in monitor power supplies, should you use the slow-blow kind or the normal kind?

what monitor and what fuse are you talking about? Alot of factors go into place.

If its SMD then most of the time i see them as fast blow. If its the main fuse right after the power input then most of those are slow-blow. It just depends on the application.

[selldoor]

Re: fuse question

It often tells you on the board - there is a message saying use ONLY the same type of fuse?

[Undead]

Re: fuse question

Yes it does say to use only the same type and rating of fuse but doesn't say what type it is (that I can see anyway).

The monitor is an Acer X193W.

The info right above the fuse (not visible in the picture) says

4A/250V and it's identified as F301.

[selldoor]

Re: fuse question

If you look on the metal shoulders on the fuse it might say more.
What I am thinking is that if it is a slow blow it is usually described as a T4A 250v T= Time delay. Otherwise its a normal fuse - you should replace glass with glass ceramic with ceramic. (Not that I always do)

[Undead]

Re: fuse question

Yes there is definitely a T before the 4A. Had to remove it to read it.

Ok so I will order several of the slow-blow ceramic 4A 250V fuses.

Thank you both for the help

[selldoor]

Re: fuse question

If you are working on a board that repeatedly blow fuses put a filament light bulb
across where the fuse would go. If this is a mains fuse use a 40 or 60 watt 240v bulb.
If there is a short the bulb will light bright if not it will light then dim as the board powers up saving fuses.

[Undead]

Re: fuse question

Well I'm hoping that it won't repeatedly blow. I just got the monitor (was turned in for recycling) and after replacing the caps since there were bad ones, it was still dead. I checked the fuse and it was bad so I figure it won't hurt to get a few extras "just in case" since I have to place an order anyway.

[aqibi2000]

Re: fuse question

If you are working on a board that repeatedly blow fuses put a filament light bulb
across where the fuse would go. If this is a mains fuse use a 40 or 60 watt 240v bulb.
If there is a short the bulb will light bright if not it will light then dim as the board powers up saving fuses.

I've always wanted to try this but not sure if the bulb would withstand the current, and blow itself. Can you recommend a wattage for a 250v 8amp slow blow fuse thats been constantly tripping doing my nut in

Thanks

[selldoor]

Re: fuse question

aqibi2000 - here is a link with more info.
8Amps is quite hefty what are you working on? - Perhaps you need to start a thread? and ask for help.

http://www.ea8ay.com/fairbanks_morse...ts/dimbulb.htm