Zenith 27 inch model #sm2787BT year 95 picture and sound comes ok,but after a minut high voltage shuts down,sound remains there,start tv again some times hv comes on some times not,also while tv works changing chanel tv h.v shuts down,if some one knows this problem,thank you./
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That's not a good sign. There are a number of parts in any TV that can put on quite a show when they fail. In many Zenith models, picture tube failure can cause this when high voltage gets back onto the circuit board. The glow you mentioned, if it was on the screen, is one symptom of such a failure.
Having this repaired is uneconomical. Labor alone may be $60 or more (I'm sure it will be...our shop charged that for a complex repair when I left the service business almost 10 years ago) and then you need parts. The repair bill could easily approach replacement cost, especially if it is the picture tube (and then it would cost more to repair than replace).
Use this as an excuse to treat yourself to a new TV. There's almost always a sale somewhere on small flat-screen models.
This sounds like a serious overload of the power supply circuitry - as the TV tries to start up, it is sensing an overload and therefore shuts itself down to protect itself (and you if it overheated).
Primary causes of such overloads in older TVs is a fault in the power supply circuitry itself, or a fault in the line output circuitry (the bit that generates the high voltages TV's use, and also the bit that scans the picture left to right).
Both types of fault require expertise and test equipment well beyond DIY level, to diagnose and repair.
Suggest you call a repair shop who should give you a free estimate as to likely cost of repair. Then you can decide if it worth it or not.
I sorry to say I think you have a component failing that is related to heat. 15 years is a long time and if the TV was used in hpot conditions over the years it may well be the proble, or it's just old.
Hello to all, I have a tv zenith model C27V36, and it has a problem I connect it in the series and it does not turn on and I connect it to the network(net) and immediately burns (damages) the horizontal exit that is a trasistor C5905 and it burns (damages) both resistances of the protection,I changed the trasistor C5905 for a trasistor C3997 that is 20 amps and nonetheless it burns it,there are no signs of short circuits. Could the problem be the high horizontal ocsilacion?? But since turning it on it burns(damages) the horizontal exit I do not have way of checking it, because it is automatically damaged . can someone please tell me what to do in this case??? Or where I can find an electronic diagram or a sketch??? Or can someone who has worked on this TV before h help me out?? It is a zenith model C27V36 of 27 ".. thank you for you help.
From the way you describe the problem, it seems you have a high voltage
leak. To check this, make the room dark and look into the back of the
TV while turning it on. If you see something like lighting jumping
around you have this high voltage problem. The TV will eventually
destroy itself under this condition. I would suggest not using it until
you get it repaired. The repair cost will be much lower if the TV is
still working when you take it in. The high voltage leak will destroy
more parts and cause the TV to stop working. Then it will blow a fuse.
First it's not just Philips, they all are making TV to only last a few years now, they are not made to last, thats how they make money by selling you something you will have to replace in just a few short years. As far as your problem, you may have a cold solder joint somewhere, do you have a 25/35 watt soldering iron? if so try soldering pins on the regulator IC the vertical IC the horz output transistor and drive transformer and the flyback, in fact solder just about as much as you can, spend some time in there soldering. Dont forget to ubplug the set and stay away from the high voltage anode connected to the picture tube, it can still hold a charge even if the set is unplugged, do not try to take it off. Hope this helps!
You have a problem is in your horizontal section which also is part of your power supply. The high pitched whine is from the Intergrated High voltage transformer (also called the flyback transformer). This sound occurs when the freuency of the transformer changes and or the voltage gets too high. The click occurs as a result of the drawing of excessive current by the HOT Horizontal output transistor. This is repairable, but requires the correct equipment and a schematic.
If the line goes across the screen you have a loose solder joint on the vertical output IC.
I've seen this happen many times in Zeniths and a lot of other sets. If the IC is not loose then there is a loose solder joint somewhere else in the vertical circuit. These IC's are 10 - 13 pin chips that operate the vertical deflection on your set. I feel like a drop of solder in the right place will fix it!
You apparently have a high voltage arc.
Possibly the anode lead to your picture tube.
Also the flyback transformer could be arcing.
If you're not experience with tv repair, you need to have a tech check it for you. The circuits operate at very high voltage and if you get into it you can get a possibly fatal electrical shock.
Be careful !!!