tv blows fuse
in [Repair]
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From: Steve45 on 28 Mar 2007 20:47 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! -- Steve45
From: powerampfreak on 29 Mar 2007 00:01 On 29 Mar, 02:47, Steve45 <Steve45.2o6...(a)diybanter.com> wrote: > 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! > > -- > Steve45 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
From: James Sweet on 29 Mar 2007 04:11 powerampfreak wrote: > On 29 Mar, 02:47, Steve45 <Steve45.2o6...(a)diybanter.com> wrote: > >>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! >> >>-- >>Steve45 > > > 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.
From: Arfa Daily on 29 Mar 2007 04:30 "powerampfreak" <powerampfreak(a)hotmail.com> wrote in message news:1175140904.756696.176110(a)y80g2000hsf.googlegroups.com... > On 29 Mar, 02:47, Steve45 <Steve45.2o6...(a)diybanter.com> wrote: >> 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! >> >> -- >> Steve45 > > 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
From: powerampfreak on 29 Mar 2007 07:17
On 29 Mar, 10:11, James Sweet <jamessw...(a)hotmail.com> wrote: > powerampfreak wrote: > > On 29 Mar, 02:47, Steve45 <Steve45.2o6...(a)diybanter.com> wrote: > > >>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! > > >>-- > >>Steve45 > > > 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.- Dölj citerad text - > > - Visa citerad text - I believe he means the internal fuse in the set, don't you think? |