Help identifying fuse

[[email protected]]

Help! My 4-year old Sony monitor has just died. It's a 17-incher, model
HMD-A200. Nice monitor with USB hub.

It didn't make any sounds, just went off. No power. Disconnected from
the computer didn't help. Tried different wall outlet. Didn't help.

Figured it's the fuse. Opened case and removed fuse. No Amperage rating
on fuse. It says "T4H250V" on one end, followed by some icons I can't
identify (an "S" in a circle, what looks like a large arrow with a
smaller arrow inside, and then--I swear I'm not kidding--what looks like
an upside-down peace symbol from the sixties).

I thought this may mean its a 4-amp, but I really don't want to replace
it without knowing.

<minor rant> How come they didn't use a breaker instead of the fuse and
put a reset button outside on the case?

Anyway, any advice would be greatly appreciated. I don't have much
testing gear, nor much experience, but I DO have a philips screwdriver
<bseg>!

Anyone who knows the amperage of these fuses could respond here or email
me at <[email protected]>. Thanks in advance.

 

[[email protected]]

Help! My 4-year old Sony monitor has just died. It's a 17-incher, model
HMD-A200. Nice monitor with USB hub.

It didn't make any sounds, just went off. No power. Disconnected from
the computer didn't help. Tried different wall outlet. Didn't help.

Figured it's the fuse. Opened case and removed fuse. No Amperage rating
on fuse. It says "T4H250V" on one end, followed by some icons I can't
identify (an "S" in a circle, what looks like a large arrow with a
smaller arrow inside, and then--I swear I'm not kidding--what looks like
an upside-down peace symbol from the sixties).

I thought this may mean its a 4-amp, but I really don't want to replace
it without knowing.

<minor rant> How come they didn't use a breaker instead of the fuse and
put a reset button outside on the case?

Anyway, any advice would be greatly appreciated. I don't have much
testing gear, nor much experience, but I DO have a philips screwdriver
<bseg>!

Anyone who knows the amperage of these fuses could respond here or email
me at <[email protected]>. Thanks in advance.

Okay, never mind. I just spent all day googling to try to figure out the
amperage of that fuse. I failed to find anything specific. I tried
calling Sony's tech support number (talked to a human being, but he said
he couldn't give me the info I needed); googled my monitor model number,
tried searching with the terms "fuse" "rating" "amps" and so on, all
fruitlessly.

Just as I decided to use a 4A fuse, I tried what to most people would
have been obvious: googling the numbers on the fuse itself: T4H250V.

I got three hits. One was an expired link to a German page. The next was
to a temperature controller. That (.pdf) link was a tech manual that
noted a fuse like mine, but didn't note the amperage.

Finally, the last page:

<http://google/search?q=cache:LHPwOrDm7igJ:www.hicontrol.co.kr/landis/n74
19e-LGD1...pdf+T4H250V&hl=en&ie=UTF-8>

Another .pdf link to a gas burner control which also uses the same fuse,
but which gave the amperage: 0.5 amps.

Yowee! I almost stuck a 4A fuse in there. Heck, I could've just used a
penny

Anyhow, thanks for any efforts made on my behalf.

 

[Boris Mohar]

Anyhow, thanks for any efforts made on my behalf.

The questions is, is the fuse blown?

 

[[email protected]]

The questions is, is the fuse blown?

No, I replaced it (don't have a VOM to test for continuity) and the
monitor still won't power up. Oh, well.

I actually found a terrific site for electronic repair (in this case
monitors) here:

<http://www.repairfaq.org/REPAIR/F_monfaq.html>

but I have neither the tools nor the expertise (and would probably wind
up electrocuting myself).

Luckily, CRT monitors are pretty cheap these days because everyone wants
LCD, although I doubt any of the new ones I can afford will be as nice
as this Sony, which also serves as a 4-port USB hub. Of course, I'll
still have to unload the Sony somewhere.

At least I won't have to try to cope with this tiny little 14 inch
screen anymore

 

[Ed Price]

Help! My 4-year old Sony monitor has just died. It's a 17-incher, model
HMD-A200. Nice monitor with USB hub.

It didn't make any sounds, just went off. No power. Disconnected from
the computer didn't help. Tried different wall outlet. Didn't help.

Figured it's the fuse. Opened case and removed fuse. No Amperage rating
on fuse. It says "T4H250V" on one end, followed by some icons I can't
identify (an "S" in a circle, what looks like a large arrow with a
smaller arrow inside, and then--I swear I'm not kidding--what looks like
an upside-down peace symbol from the sixties).

I thought this may mean its a 4-amp, but I really don't want to replace
it without knowing.

<minor rant> How come they didn't use a breaker instead of the fuse and
put a reset button outside on the case?

Anyway, any advice would be greatly appreciated. I don't have much
testing gear, nor much experience, but I DO have a philips screwdriver
<bseg>!

Anyone who knows the amperage of these fuses could respond here or email
me at <[email protected]>. Thanks in advance.

Consider that a "blown" fuse is NOT a failed fuse. The fuse has properly
performed its safety function by destroying itself. A good technician's
response to finding a blown fuse is to question why the fuse was forced to
operate. If you persist in simply replacing fuses, then you move into the
diagnostic phase called "fuse testing."

Ed

 

[[email protected]]

Consider that a "blown" fuse is NOT a failed fuse.

Yah, I read that on the repairFAQ site. They mentioned that sometimes a
fuse just wears out, but also talked about why fuses in monitors blow.
Unfortunately, that wasn't the problem. And even if it had been, I don't
have the equipment to effectively diagnose.

 

[JeffM]

googling the numbers on the fuse...an expired link

bearclaw

Click on the "Cached" link next time.
Google can pull up a copy of a dead page
and sometimes their cache of the page can take you back in time.

That the search term is highlighted in color when you call the cached page,
often makes the cached page more useful than the original.

 

[CWatters]

Anyone who knows the amperage of these fuses could respond here or email
me at <[email protected]>. Thanks in advance.

Sometimes it's marked on the PCB.

 

[Michael]

At least I won't have to try to cope with this tiny little 14 inch
screen anymore

You'd better look again. _I_ was the last person on this planet to
replace his 14" monitor, and that was over a year ago.
;-)

 

[kurmud]

it is a 4 amp 250V fuse. I have a CRT and this is marked directly on the PCB just by this fuse.