Identify Fusible Resistor

[Neverest]

Hello all!

I need help with identifying the fuse in the picture below. Its placed in a 12v, 1.8A 22W TV. The color coding is green, black and red. Any suggestions to where I can get one or an alterative to replace it with?

[Agent24]

Re: Identify Fusible Resistor

Obviously, that colour code doesn't match any sensible resistor code (for a 3-band and hence 20% resistor, it would be at best 51k, which makes no sense)
It doesn't match fuse codes here: http://www.slimlab.net/mirror/fuseco...usecolours.htm either.

Maybe just replace it with a 2 - 2.5A fuse, if the normal operation current is 1.8A.

Do you have a model number? Schematic?

[redwire]

Re: Identify Fusible Resistor

red black green = 215 maybe 2.15A? The colour code website is for AGC glass fuses so might not match this part. It's a strange part but the PCB looks Asian.

Just look for a through-hole fuse like Belfuse RST, Littelfuse 392, Schurter FST etc. and bend the leads to fit. Picofuses are expensive.
I'm not sure what manufacturer is popular in Norway.
Or take an ordinary fuse and solder on pigtail leads, and put that in a piece of heatshrink tubing or PVC tubing.

[jiroy]

Re: Identify Fusible Resistor

It's not critical to put any fuses higher than 2A , but fusible resistors differ of ordinary fuses that they are fast responding to surge powers or lightening , so if this device isn't exposed to such risks , in a safe environment , then it's okay . If not , then better acquire the original one .

[Neverest]

Re: Identify Fusible Resistor

I'll try this then, if you think its an ok replacement.

Fuse 2 A super fast-blow 251 / Pico® II, 0251002.MAT1L, Littelfuse:

Rated current 2 A A
Breaking capacity 50 A@ 125 VAC, 300 A @ 125 VDC A
Rated voltage 125 VAC/DC
Characteristic (time/current) super fast-blow
Construction form Ceramic tube, leaded
Series 251 Pico® II



I was the one responsible for the surge, by accidentaly reversing poles on the 12v solar system during some error testing... I guess you can call that a hazardous environment!

The PCB is called CV209LT_A1 and the Internet isn't exactly flooding with info about it. I get two results on Google, where this is one of them, with some pictures: http://www.teleservice-depannage.com...-HTL2435HD.htm

[Agent24]

Re: Identify Fusible Resistor

If you reversed the power connector, there may be more blown than the fuse.

I don't know if the fuse is suitable, I would have thought a fusable resistor would act like a slow-blow fuse but I'm not certain, now that I have to think about it.

[stj]

Re: Identify Fusible Resistor

it would be nice if i could see the alleged picture.

[Agent24]

Re: Identify Fusible Resistor

it would be nice if i could see the alleged picture.

Here it is

[budm]

Re: Identify Fusible Resistor

Fusible resistor info.

[Neverest]

Re: Identify Fusible Resistor

If you reversed the power connector, there may be more blown than the fuse.

Since I had measured that the fuse was shorted, I tested with a copper wire, just to see if it was life (It was dead, so I figured I had nothing to loose). It seemed to turn on and light up the panels, but I turned it of again as fast as I saw light, because I was unsure of its function other than fusing. So if the TV would operate normaly with a new fuse, I am unsure.

When it happened, there was no sound and no smoke from the TV, unlike the brand new dab-radio that made nasty noice and produced an atomic mushroom cloud... So I figure the fuse blew pretty instant.

Could there be any negative effects of using the picofuse, other than the TV breaking again? Like fire hazard because of different function?

I am able to use a soldering iron and replace identified parts with correct replacement parts, but when I am unable to figure out the correct part and its function, I am at loss...

[redwire]

Re: Identify Fusible Resistor

The fuse protects the parts, PCB traces, DC jack etc. from burning up if there is a short circuit somewhere.
I do not see any danger with the fuse you have put in. If anything it would blow fast before smoke gets out
I would see if the TV runs.

UL/CSA/IEC and electrical codes I find fuses are rated 167% of the usual current, so a 3A fuse for the 1.8A TV as a rough guide.
Picofuse 251 is a very fast fuse, at 3A it blows in 0.5 second. The Picofuse 47x series is slow-blo and (2A) one at 3A blows in 1 minute.

budm maybe thinks it is a fusible resistor?

Maybe... a way to see what the part is, is to break it in half and see if the fine wire inside is soft and hollow tube like a fuse, or harder like nichrome wire in a fusible resistor with wrapped cylinder body. Or scrape off the paint.