Purpose of fuse in televlision...

[micky]

I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire\'s insulation, and starting a fire?

Or the opposite, to protect the TV
from surges.

It will be hard to find another fuse. It\'s a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it\'s probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)

If the purpose of the fuse is only to protect the tv, I\'m willing to
take the risk, wrap the fuse in tinfoil and put it back together.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.

Right?

The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that\'s not so bad.
































We are 50 miles from nowhere down a rainy winding road.

 

[micky]

In alt.home.repair, on Sat, 12 Mar 2022 20:55:09 +0200, micky
<NONONOmisc07@fmguy.com> wrote:

I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire\'s insulation, and starting a fire?

Or the opposite, to protect the TV
from surges.

It will be hard to find another fuse. It\'s a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it\'s probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)

It seems to be 8 amps. I didn\'t think they used them that big, but
otoh it\'s 40amp led screen tv.

We are 50 miles from nowhere down a rainy winding road.

Tomorrow we can make some phone calls trying to find a place closer than
60 miles, but you know as well as I that even if the ad says
Electronicsm they probably won\'t have it, and real reapir stores are few
and far between. And I don\'t want to spend tomorrow night here. I want
to fix this and be done.

If the purpose of the fuse is only to protect the tv, I\'m willing to
take the risk, wrap the fuse in tinfoil and put it back together.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.

Right?

The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that\'s not so bad.

 

[danny burstein]

In <5esp2hpfn7o6snpjv8fr9tr1b01v6jvk0l@4ax.com> micky <NONONOmisc07@fmguy.com> writes:
[snip]

It will be hard to find another fuse. It\'s a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it\'s probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)

We are 50 miles from nowhere down a rainy winding road.

Tomorrow we can make some phone calls trying to find a place closer than
60 miles, but you know as well as I that even if the ad says
Electronicsm they probably won\'t have it, and real reapir stores are few
and far between. And I don\'t want to spend tomorrow night here. I want
to fix this and be done.

About 3 decades (obligatory where does the time go?) ago my
large (for the time) Sony tv just died. I took it apart
and yes, there was a fuse in the power supply that had blown.

It was a simple automotive type ACG glass fuse, so the next
time I was near a car supply place I picked up a set of them.

I figured there was enough of a chance this was a \"once off\"
fuse failure that (aside from my time...) it was worth
spending $2.50 or so to check it out.

(Alas, that second fuse blew, too).

Anyway, that might be an option for you. Depending on
how the wiring posts are, you might be able to
hook up a similar automotive fuse holder and, well,
fuse... and see what happens. Probably $10 or so
of parts nowadays.


--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]

 

[Bob F]

On 3/12/2022 10:55 AM, micky wrote:

I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire\'s insulation, and starting a fire?

Or the opposite, to protect the TV
from surges.

It will be hard to find another fuse. It\'s a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it\'s probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)

If the purpose of the fuse is only to protect the tv, I\'m willing to
take the risk, wrap the fuse in tinfoil and put it back together.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.

Right?

The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that\'s not so bad.

There could be a voltage limiter, like a MOV just past that fuse that
shorts out to blow the fuse, thus keeping surge voltage from frying the
TV. Such a device may need to be replaced also to retain that
protection, or, if shorted, it would have to be disconnected.

 

[Mike Coon]

In article <5esp2hpfn7o6snpjv8fr9tr1b01v6jvk0l@4ax.com>, NONONOmisc07
@fmguy.com says...

In alt.home.repair, on Sat, 12 Mar 2022 20:55:09 +0200, micky
NONONOmisc07@fmguy.com> wrote:

I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire\'s insulation, and starting a fire?

Or the opposite, to protect the TV
from surges.

It will be hard to find another fuse. It\'s a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it\'s probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)

It seems to be 8 amps. I didn\'t think they used them that big, but
otoh it\'s 40amp led screen tv.

We are 50 miles from nowhere down a rainy winding road.

Tomorrow we can make some phone calls trying to find a place closer than
60 miles, but you know as well as I that even if the ad says
Electronicsm they probably won\'t have it, and real reapir stores are few
and far between. And I don\'t want to spend tomorrow night here. I want
to fix this and be done.

If the purpose of the fuse is only to protect the tv, I\'m willing to
take the risk, wrap the fuse in tinfoil and put it back together.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.

Right?

The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that\'s not so bad.

You cannot mean 40 amps, surely? Even at only 110 volts that is still
quite a powerful heater! 40 inches, perhaps?

 

[Rod Speed]

micky <NONONOmisc07@fmguy.com> wrote

I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse:

To stop the power supply catching fire if the TV is plugged into 240V
and to protect the TV against a surge and to protect against some
fool who has chosen to use some fencing wire in the house fuse.

To keep a short circuit in the power supply (or other part of the tv)
from pulling too much current, melting the wire\'s insulation, and
starting a fire?

Starting a fire in the power supply.

> Or the opposite, to protect the TV from surges.

That too. It doesn\'t have just one purpose, like most fuses.

It will be hard to find another fuse. It\'s a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it\'s probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)

No, both types are available.

If the purpose of the fuse is only to protect the tv, I\'m willing to
take the risk, wrap the fuse in tinfoil and put it back together.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts.(It
gives the same wattage for both directions.) Surely even a coldshort
in the tv when the maxiumum supplied power is I guess about5 amps would
not be anywhere near enough to start a fire.

Right?

Wrong. It is what is catching fire that matters.

The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) andcome
back after I buy the right fuse in a city.

Or get real radical and order it on ebay or amazon.

> What are the odds it will fail in the next 3 week?

Impossible to say when a surge may happen.

That requires putting the tv back togehteran extra time, but that\'s not
so bad.

We are 50 miles from nowhere down a rainy winding road.

But presumably can still get ebay and amazon deliverys.

 

[Rod Speed]

micky <NONONOmisc07@fmguy.com> wrote

micky <NONONOmisc07@fmguy.com> wrote

I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire\'s insulation, and starting a fire?

Or the opposite, to protect the TV
from surges.

It will be hard to find another fuse. It\'s a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it\'s probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)

It seems to be 8 amps.

You sure it isnt 3 amps ?

> I didn\'t think they used them that big,

That is unusually high for a TV unless its a plasma

> but otoh it\'s 40amp led screen tv.

Presumably you mean 40 inch.

We are 50 miles from nowhere down a rainy winding road.

Tomorrow we can make some phone calls trying to find a place closer than
60 miles, but you know as well as I that even if the ad says
Electronicsm they probably won\'t have it, and real reapir stores are few
and far between. And I don\'t want to spend tomorrow night here. I want
to fix this and be done.

If the purpose of the fuse is only to protect the tv, I\'m willing to
take the risk, wrap the fuse in tinfoil and put it back together.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.

Right?

The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that\'s not so bad.

 

[Peeler]

On Sun, 13 Mar 2022 09:08:17 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

<FLUSH the abnormal trolling senile cretin\'s latest trollshit unread>

--
MrTurnip@down.the.farm about senile Rodent Speed:
\"This is like having a conversation with someone with brain damage.\"
MID: <ps10v9$uo2$1@gioia.aioe.org>

 

[Peeler]

On Sun, 13 Mar 2022 09:04:20 +1100, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

<FLUSH the abnormal trolling senile cretin\'s latest trollshit unread>

--
Pomegranate Bastard addressing the trolling senile cretin from Oz:
\"Surely you can find an Australian group to pollute rather than posting
your unwanted guff here.\"
MID: <c1pqvgte5ldlo1rn3fpl7igtg4h8i9mk7p@4ax.com>

 

[Phil Allison]

micky wrote:
==========

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage.

** The US, Canada and Japan use 100 or 120 VAC power at 60Hz.
So where are YOU ?

Can this 40 inch set happily use 50 Hz power and pick up the local broadcast format ?
Has it ever worked there?


..... Phil

 

[Clifford Heath]

On 13/3/22 5:55 am, micky wrote:

I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse:

To stop your house burning down.

> It will be hard to find another fuse. It\'s a small size ceramic fuse.

It won\'t be hard to find another fuse, but you might have to pay for
postage.

If the purpose of the fuse is only to protect the tv, I\'m willing to
take the risk, wrap the fuse in tinfoil and put it back together.

The fuse will usually blow after something else in the TV has failed. If
you bridge the fuse, it will fail harder.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.

The transformer has limited amperage because if you overload it, it will
burn out or catch fire.

Get a proper fuse. Buy two, because the first one will probably blow due
to the fault that blew the first one. Use the second after you\'ve fixed
that fault.

CH

 

[Phil Allison]

Clifford Heath is Blind wrote:

=====================

On 13/3/22 5:55 am, micky wrote:
I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse:
To stop your house burning down.

** Plenty of homes have burned down due to TV set fires that did not blow the fuse.

The fuse will usually blow after something else in the TV has failed. If
you bridge the fuse, it will fail harder.

** Huh ?

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,

The transformer has limited amperage because if you overload it, it will
burn out or catch fire.

** Most have a thermal fuse inside them.

Get a proper fuse. Buy two, because the first one will probably blow due
to the fault that blew the first one. Use the second after you\'ve fixed
that fault.

** You did see how the \"110V\" set had been somehow connected to \"220V\" ??

Massive over voltage on the PSU, electros become voltage clamps and MOSFETs go phufft.


....... Phil

 

[Clifford Heath]

On 13/3/22 1:16 pm, Phil Allison wrote:

On 13/3/22 5:55 am, micky wrote:
I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse:
To stop your house burning down.

** Plenty of homes have burned down due to TV set fires that did not blow the fuse.

The question is, how many have *not* burnt down due to a TV set fire
that didn\'t happen because the fuse blew? No protection is perfect.

A fuse in your TV isn\'t going to stop a meteorite hitting your house either.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,

The transformer has limited amperage because if you overload it, it will
burn out or catch fire.

** Most have a thermal fuse inside them.

Hopefully. Not a good idea to rely on it, as he seemed to suggest he would.

Get a proper fuse. Buy two, because the first one will probably blow due
to the fault that blew the first one. Use the second after you\'ve fixed
that fault.
** You did see how the \"110V\" set had been somehow connected to \"220V\" ??
Massive over voltage on the PSU, electros become voltage clamps and MOSFETs go phufft.

Yep, exactly why I told him not to hope a replacement fuse would fix it.
Told him to buy two fuses because he probably won\'t listen

 

[Phil Allison]

Clifford the Chirping Cricket wrote:
==============================

I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse:

To stop your house burning down.

** Plenty of homes have burned down due to TV set fires that did not blow the fuse.

The question is,

** No it isn\'t.

You reply was WRONG.

how many have *not* burnt down due to a TV set fire
that didn\'t happen because the fuse blew?

** Too many hypothetical negatives for me....

> A fuse in your TV isn\'t going to stop a meteorite hitting your house either.

** That POS takes the \"straw man\" fallacy to a whole new height.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,

Get a proper fuse. Buy two, because the first one will probably blow due
to the fault that blew the first one. Use the second after you\'ve fixed
that fault.

** You did see how the \"110V\" set had been somehow connected to \"220V\" ??

Massive over voltage on the PSU, electros become voltage clamps and MOSFETs go phufft.

Yep, exactly why I told him not to hope a replacement fuse would fix it.

** My god, you are one desperate fucking wanker.

Blowing the shit out of a SMPSU with double supply voltage not a FAULT.

Maybe you think crashing your car into a tree is a \"breakdown\" ??



....... Phil

 

[micky]

In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F
<bobnospam@gmail.com> wrote:

On 3/12/2022 10:55 AM, micky wrote:
I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire\'s insulation, and starting a fire?

Or the opposite, to protect the TV
from surges.

It will be hard to find another fuse. It\'s a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it\'s probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)

If the purpose of the fuse is only to protect the tv, I\'m willing to
take the risk, wrap the fuse in tinfoil and put it back together.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.

Right?

The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that\'s not so bad.

There could be a voltage limiter, like a MOV just past that fuse that
shorts out to blow the fuse, thus keeping surge voltage from frying the
TV. Such a device may need to be replaced also to retain that
protection, or, if shorted, it would have to be disconnected.

This seems very important. If there is one that\'s shorted, it will just
blow the fuse over and over, and if I\'ve bypassed the fuse....would that
allow enough current to start a fire?

The board has a fee parts that might be a MOV.
They are labeled CY101..., TH101..., UA101 and CP101. There is only
one of the last two.
Are any of these usual abbreviation for a MOV? I\'ve been looking
online for a list of abbreviations that includes these, no luck so far,
quicker to ask you, Bob (and others).

Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo :
https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]

I\'m the second or third person she\'s had look at it. It\'s too big and
heavy to take to a shop, so if I bypass the fuse and fail to note a
shorted MOV and it gets worse, I think she will just take her loss and
buy one.


References to previous thread. The TV has HDMI input (3 interfaces!),
but when she lived in Baltimore she was streaming from Amazon, and I
think that was her current plan. Although I don\'t understand how. The
manual says \"INPUT — Repeatedly press to change the source you are
viewing (ANT/CABLE, VIDEO 1, VIDEO 2, ColorStream
HD1, ColorStream HD2, HDMI 1, HDMI 2, HDMI 3, PC).\"

Colorstream is their name for separate red, blue, whatever color input.
Component! That\'s it. She can\'t use that.

Video1 AND 2 are composite, she can\'t use that.

PC IN — For use when connecting a personal computer. When she lived in
Baltimore her PC was in another room and I don\'t think there was a wire
connecting them. I\'ve written her son to try to find out what she is
talking about.

 

[Phil Allison]

micky mouse the moron wrote:

======================

This seems very important. If there is one that\'s shorted, it will just
blow the fuse over and over,

** Plus itself too - MOVs explode and shatter.

and if I\'ve bypassed the fuse....would that
allow enough current to start a fire?

** No. But would trip your breaker.



....... Phil

 

[Jeff Layman]

On 13/03/2022 05:52, micky wrote:

In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F
bobnospam@gmail.com> wrote:

On 3/12/2022 10:55 AM, micky wrote:

(snip)

This seems very important. If there is one that\'s shorted, it will just
blow the fuse over and over, and if I\'ve bypassed the fuse....would that
allow enough current to start a fire?

Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo :
https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]

(what url did you forget to insert?!)

Did you not read the warning above the fuse on that PCB?
\"CAUTION: For continued protection against risk of fire replace only
with same type and rating of fuse\". I don\'t think it could be any clearer.

Out of interest, is it usual in the US to spec a 240V fuse for use with
a 120V supply?

--

Jeff

 

[micky]

Ok, guys, I jumpered the fuse holder with a store-bought 10\" jumper wire
and got a big spark (even before I tried to turn the tv on. I guess I
should have anticipated that.)

I thought that was bad until I thought, Well, it uses almost 8 amps and
maybe the alligator clips didn\'t make a good connection.

So used all three jumper wires and this time no spark, just smoke.

From one of the diodes, based on the brown spot next to it and the
swollen diode.

Plus the alligator clips at one end of two of the jumper wires fell off!

So now it\'s on to a new board.

The board is discontinued of course, but there are lots for sale at
various places, all about 40 dollars. Whether they are new,
\"reconditioned\" or used, it\'s okay by me.

The part number is Toshiba PK101V0830I

But what would be great is to find the 220v version of this. So how
would I find what the part number is for the 220 volt version of this.

I wrote Toshiba to ask what the partnumber would be for 220v, but I
think I wrote Toshiba USA. I can call Toshiba in the US Monday at
8AM. Will they know or should I call some European repairman? I
haven\'t found a tech support page for anywhere in Europe yet. It looks
like I have but then the page is about all of Toshiba, not just tvs, not
just consumer goods,

Would Toshiba use the same tv model# 40RV525U for its 220volt model? I
doubt it, and I can\'t guess what it would be.

What should I do next? (Helpful answers only, please.)



In alt.home.repair, on Sat, 12 Mar 2022 20:55:09 +0200, micky
<NONONOmisc07@fmguy.com> wrote:

I took apart the television I\'ve posted about and there is a fuse on the
power supply board and it\'s blown. It was blown (and the home circuit
breaker was tripped at the same time it iseems) when a helpful neighbor
plugged the 110v tv straight into 220.

What is the purpose of the fuse: To keep a short circuit in the power
supply (or other part of the tv) from pulling too much current, melting
the wire\'s insulation, and starting a fire?

Or the opposite, to protect the TV
from surges.

It will be hard to find another fuse. It\'s a small size ceramic fuse.
I can post the size after I f ind a lamp and a magnifying glass, but
it\'s probably 2 or 3 amps, right? (Are all ceramic fuses slo-blo?)

If the purpose of the fuse is only to protect the tv, I\'m willing to
take the risk, wrap the fuse in tinfoil and put it back together.

If it\'s to avoid a fire, then this is a 110v tv in a 220 volt world,
supplied by a step-down transformer of limited amperage. 500 watts. (It
gives the same wattage for both directions.) Surely even a cold short
in the tv when the maxiumum supplied power is I guess about 5 amps would
not be anywhere near enough to start a fire.

Right?

The other possibility is to wrap the fuse in foil, decide if it works or
not, and leave here (where it is too cold for me and too rainy) and come
back after I buy the right fuse in a city. What are the odds it will
fail in the next 3 week? That requires putting the tv back togehter an
extra time, but that\'s not so bad.
































We are 50 miles from nowhere down a rainy winding road.

 

[Ralph Mowery]

In article <t0kdsg$r3u$1@dont-email.me>, jmlayman@invalid.invalid
says...

Did you not read the warning above the fuse on that PCB?
\"CAUTION: For continued protection against risk of fire replace only
with same type and rating of fuse\". I don\'t think it could be any clearer.

Out of interest, is it usual in the US to spec a 240V fuse for use with
a 120V supply?

--

In the US fuses for the plug in devices like lamps and TV sets are
usually rated for 250 volts. It is fine to use a fuse rated for 250
volts on the 120 volt devices. Most of the house wiring is for 120
volts for the common plug in wall sockets.

There are some fuses rated for around 25 volts (forget the exect
voltage) that are made to use in the older cars that operate on 12 volts
and maybe 24 volts DC.

The reason for a voltage rating on a fuse is that if a higher voltage
is used it may arc over and not actually cout off the power. A fuse
rated for 10 amps will open at around 10 amps no matter what the voltage
is as long as it is low enough not to arc over.

 

[micky]

In alt.home.repair, on Sun, 13 Mar 2022 09:35:12 +0000, Jeff Layman
<jmlayman@invalid.invalid> wrote:

On 13/03/2022 05:52, micky wrote:
In alt.home.repair, on Sat, 12 Mar 2022 11:54:18 -0800, Bob F
bobnospam@gmail.com> wrote:

On 3/12/2022 10:55 AM, micky wrote:

(snip)

This seems very important. If there is one that\'s shorted, it will just
blow the fuse over and over, and if I\'ve bypassed the fuse....would that
allow enough current to start a fire?

Retirednoguilt was kind enough to post
Power supply on ebay shows a fuse in the photo :
https://www.ebay.com/itm/Toshiba-40RV525U-Power-Supply-75013355-PK101V0830I-/263417775721?_trksid=p2349526.m4383.l4275.c3#viTabs_0
and that looks just like her power supply. --- Surprising since I had
found this video of someone repairing the PS on supposedly the same
model and the boards look entirely diffferen -- [Insert url here]

(what url did you forget to insert?!)

Who knows! With all the radiation I\'ve gotten ever since I used that
off-brand fuse, I can\'t tell my right hand from my right hand.

>Did you not read the warning above the fuse on that PCB?

No. Warnings are for grown-ups.

\"CAUTION: For continued protection against risk of fire replace only
with same type and rating of fuse\". I don\'t think it could be any clearer.

Out of interest, is it usual in the US to spec a 240V fuse for use with
a 120V supply?

Most fuses go up to 250, don\'t they?