tv blows fuse

[Steve45]

hi folks i'm new to this forum and have a question . i have a sylvani
srt2127s that blows the fuse as soon as i plug it in. I just starte
messing with busted tv's as a hobby because i recently had surgery fo
a work related accident and needed something to keep my mind and m
hands busy. I just fixed an old sanyo that just needed a couple o
capacitors and now i'm trying my luck with the sylvania.please talk i
layman's terms as i am not tech educated. pictures or diagrams of part
to check or replace would be very helpful. thanks,wish me luck

 

[powerampfreak]

hi folks i'm new to this forum and have a question . i have a sylvania
srt2127s that blows the fuse as soon as i plug it in. I just started
messing with busted tv's as a hobby because i recently had surgery for
a work related accident and needed something to keep my mind and my
hands busy. I just fixed an old sanyo that just needed a couple of
capacitors and now i'm trying my luck with the sylvania.please talk in
layman's terms as i am not tech educated. pictures or diagrams of parts
to check or replace would be very helpful. thanks,wish me luck!

Hi,
Your description indicates a "primary-side" failure, in other words,
the side which is not
galvanically isolated from the mains and need great focus to not kill
yourself during repair.
A wild guess, would be a shorted input rectifier or a shorted
switching transistor in the TV's switchmode powersupply.
I've even seen damaged mainscords with internal shorts! Maybe a dog
chewed on it. This would of course lead to a fuse blow before pressing
mains switch on the set.
I'm not familiar with this specific set, but that's general TV tips.

Good luck!

--- Steve

 

[James Sweet]

Hi,
Your description indicates a "primary-side" failure, in other words,
the side which is not
galvanically isolated from the mains and need great focus to not kill
yourself during repair.
A wild guess, would be a shorted input rectifier or a shorted
switching transistor in the TV's switchmode powersupply.
I've even seen damaged mainscords with internal shorts! Maybe a dog
chewed on it. This would of course lead to a fuse blow before pressing
mains switch on the set.
I'm not familiar with this specific set, but that's general TV tips.

Good luck!

--- Steve

Well assuming he's in North America, the mains plug is not fused. The
only circuit protection we have here aside from the fuse in an
individual piece of electronics is the 20A breaker on the branch circuit.

 

[Arfa Daily]

Hi,
Your description indicates a "primary-side" failure, in other words,
the side which is not
galvanically isolated from the mains and need great focus to not kill
yourself during repair.
A wild guess, would be a shorted input rectifier or a shorted
switching transistor in the TV's switchmode powersupply.
I've even seen damaged mainscords with internal shorts! Maybe a dog
chewed on it. This would of course lead to a fuse blow before pressing
mains switch on the set.
I'm not familiar with this specific set, but that's general TV tips.

Good luck!

--- Steve

I would agree with this basic diagnosis, and would also seek to reinforce
the advice regarding safety. If you are new to this, you absolutely MUST
gain some understanding of the dangers of switch mode power supplies, and I
would strongly recommend that you do some internet research on this aspect
first. They honestly are potentially lethal in inexperienced hands, and can
still give you a VERY powerful shock, even hours after they have been
switched off, with some fault conditions. You might like to cover your eyes,
or turn your head away when you switch on, also. It is not at all uncommon
to have the chopper transistor explode its side off, or the wrong type
(glass) fuse shatter explosively. If you are intending getting to grips with
these, I would recommend at a minimum, fixing yourself up with a proper
bench isolation transformer, to offer yourself at least a degree of personal
safety.

Arfa

 

[powerampfreak]

Well assuming he's in North America, the mains plug is not fused. The
only circuit protection we have here aside from the fuse in an
individual piece of electronics is the 20A breaker on the branch circuit.- Dölj citerad text -

- Visa citerad text -

I believe he means the internal fuse in the set, don't you think?

 

[b]

hi folks i'm new to this forum and have a question . i have a sylvania
srt2127s that blows the fuse as soon as i plug it in. I just started
messing with busted tv's as a hobby because i recently had surgery for
a work related accident and needed something to keep my mind and my
hands busy. I just fixed an old sanyo that just needed a couple of
capacitors and now i'm trying my luck with the sylvania.please talk in
layman's terms as i am not tech educated. pictures or diagrams of parts
to check or replace would be very helpful. thanks,wish me luck!

I agree with the other posts in this thread. May I add that a quick
initial test might be to disconnect the degauss coils from where they
plug into the circuit board (they're the loop of plasticky wire going
round the back of the tube near its perimiter). power up and see. you
may need to replace the 3 legged (or sometimes 2) posistor.
incidentally, it is advisable to wire a 100w bulb in series with the
mains input - over the internal fuse maybe. if it shines you still
have a dead short; if not then you're probably OK, that way you save
fuses.
-B.

 

[Meat Plow]

hi folks i'm new to this forum and have a question . i have a sylvania
srt2127s that blows the fuse as soon as i plug it in. I just started
messing with busted tv's as a hobby because i recently had surgery for
a work related accident and needed something to keep my mind and my
hands busy. I just fixed an old sanyo that just needed a couple of
capacitors and now i'm trying my luck with the sylvania.please talk in
layman's terms as i am not tech educated. pictures or diagrams of parts
to check or replace would be very helpful. thanks,wish me luck!

Well I'll wish you luck with your recent surgery as I'm going through the
same thing myself but when it comes to repair, skill and knowledge usurp
luck. Look in the power supply (smps)for shorted diodes or switching
transistors. Be warned that to the novice like you, an smps can be
dangerous and possesses potentially fatal voltages.

--
#1 Offishul Ruiner of Usenet, March 2007
#1 Usenet Asshole, March 2007
#1 Bartlo Pset, March 13-24 2007
#10 Most hated Usenetizen of all time
Pierre Salinger Memorial Hook, Line & Sinker, June 2004
COOSN-266-06-25794

 

[James Sweet]

I believe he means the internal fuse in the set, don't you think?

Yes, I'm pretty sure he does. I was replying to another response to his
post.