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 set is highly rated by users .. it first came out in early 2009 (i think) so you might check to see if any warranty remains ... the display is illuminated by several lamps .. each lamp has its own high voltage inverter .. all the innverters are powered by an output of the low voltage power supply (often 18 volts)... i would suspect a problem with that low voltage power supply.. either a bad capacitor or a thermal issue .. .. ..
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.
NEVER operate a set after it makes a loud pop. Only high voltage discharges can make such a sound. It is DANGEROUS to operate a set under those conditions. The chassis could be electrified or it could start a fire. Contact a qualified service technician.
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.
Rainman, can`t really be of any great help on this one, both techs can be right, the chirp is exactly as you thought, the set is trying to come on but there is a short in the set and it`s shutting down because of the short, could be convergence, low voltage power supply, high voltage power supply, until a tech gets in there and starts un-loading circuits it`s impossible to say where the short is, gonna have to call someone out for this one, good luck with it, BMW Rider
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!