Won't turn on - relay clicks, power supply squeals, relay clicks, etc,
The boss just brought in his Zenith C34W37 television. When I plug it in, I hear it de-gausse (sp?), the relay clicks on, I hear the switching power supply squeal for a second or so, the relay clicks off, then on again, the power supply squeals again, and that repeats as long as the TV is plugged in.
I don't see any obvious bad caps, but I haven't really tested anything yet. To me, it sounds like something is shorted, but I don't know where to start.
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These flat panel Tv's, all of them, sometimes have cheap Capacitors in the power supply section. They'll keep tv off and tripping relay circuits. It's not a fault in the power supply ic's, it's a fault in the main Capacitors. The IC thinks there is a leak, so it shuts down tv. It monitors voltages through comparators, and compares them to reference voltages. So check main power Capacitors and replace as needed. A lot of Chinese made Capacitors are cheap. In the big sets, they break down a lot.
The clicks are coming from a mechanical relay in the standby supply for voltage---the standby power supply runs 7/24 if set is plugged into power.
What I would do if you are able is open set and on power board (power cord goes to it) look for and replace any filter caps that are puffed up there--the relay is possible but rarely bad in this way unless a solder connection under it is bad.
If caps are good you have a connection or bad part near the relay that likely is causing this problem.
Look closely at filter caps in power supply:
even one that is slightly puffed up can cause this, if find that and need to know what and how let me know.
reset the tv with the tv off, but plugged in hold down the soarce botton on the tv for 5 seconds it should click on and work. if not then there may be curcuit board issues. i found the same tv on the side of the road as somewone was throwing it out, it was leaning aganst their trash can. i brought it home. plugged it in and it went on and inediatly went to the orange vizio light. i rest it and it's been perfect ever since is my comoute monitor now...good luck i hope that fixes it for you..
Its a relay that cliking at the board.Theres a short circuit parts that may cause of relay on and off funtion thats why your Tv have no power.So Its better to repair and troubleshoot the power supply of your Television.
The television has a protection circuit. Sound like you know something about electronics so that is cool.
I suspect the HOT or High Voltage Transformer. If you want to operate on it, they typically will short externally from moisture or plastic high voltage breakdown. The TV starts, shorts as it cannot come to full high voltage, then shuts down. If your brave, you can unsolder the HOT which is the part that is on the main board or that comes from the top of the picture tube wire into a dark or spaceship type object.look underneath, sometimes they short underneath and you can scrap the carbon and get it to at least start up and work. Do not leave this as a fix as it can be a fire hazard.
The HOT is the most common. They are around 20-60 bucks. 34" TV. I am assuming this one without looking it up it is NOT a flat screen, as most do not squeal like that nor do they have to de-gausse like the old ones. I just looked it up and yes it is not a flat screen. Old school, so that is more thank likely the problem.
The power supply section is not working.
Common possibilities are:
- Convergences amps have failed overloading the supply
- High-voltage section (flyback transformer) has failed
(happens sooner or later, about 8 years typical))
- CRT tube has failed overloading the supply
- Power surge has popped the power input circuit.
(Fuse, rectifier diodes, turn-on relay etc)
- One of a hundred of electrolytic capacitors has failed
short overloading the supply. They dry
out with age, are cheap to replace, but hard to find which one it is.
- Or any of many other possibilities.
In short, you need a experianced tech to troubleshoot this.