Question about Zenith C27A24T 27" TV

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High pitch buzzing.

Nice TV from 2000. Has worked like a charm until recently. While watching tv, the screen fades and turns into a white line and makes a high pitch buzzing noise. Unplugged, and plugged back in, and right at that moment, it does the buzzing without even turning on the power. Cracked it apart, found a resistor burst and burnt the spot on the board it was on. ohmed it out and replaced it with an equivilent with higher wattage, but still makes noise with no imrovment. I have been looking for a schematic of this model with no luck, finding every other zenith model but this one. Can anyone help me solve the problem or at least help me get a schematic, preferably free?

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  • sprawly241 Nov 12, 2008

    On the circuit board it has the label RX3214. and yes, its a really high pitch buzzing that occurs as soon as it is plugged in. when its unplugged, it slows and ramps down in pitch, probably due to caps discharging but nonetheless, it does it. I actually managed to find a schematic from a similar model and after some detailed searching, I found the resister in the Horizontal/Vertical Deflection Circuit, and that its value is 22k. I can easily replace it, but I'm not sure if there was any damage to other components, and that buzzing is mysterious to me because I do not know of any single or combination of components that could do that.

  • sprawly241 Nov 12, 2008

    Alright, update.... I replaced the resistor, still buzzing. Doesn't turn on. Also, i forgot this in the last comment, but it was a horizontal line. Also, the sound is almost like clicking.

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I think rx3214 might be 2.2 ohms
now there is a 220 mfd capacitor that needs to be changed and also the vertical ic
please use the EXACT replacement

Posted on Dec 05, 2008

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Hi there
Let's make ur problem a bit clear. "white lines" how? where?
meaning retrace lines with full raster or a single vertical line?
buzzing sound? without even turning the power switch of the TV to "ON" or when u just plug the power cord?
I'll check for schema, mean while can u tell me where the resistor leads to? is it a fusible resistor? if so , to which area the resistor suppliers power?
Regards
Rifaa

Posted on Nov 12, 2008

  • Rifaa-ath Razei
    Rifaa-ath Razei Nov 17, 2008

    Hi there, Firstly make sure u turn down the screen voltage to a level so tht u see a very weak horizontal line when u work on the tv or else ur phosphor screen might burn and u will have a permanent visible line imprinted in the screen.

    A horizontal line means u have a dead vertical stage.

    But when u say it burned a 22k resistor, I am rather doubtful that u are not sue abt the value, because I don't see how a value of 22 k ohm cud get burned. it is impossible to burn a 22k with even the voltagees of a typical tv.

    I say ur vertical stage is dead.if is a old tv u cud have class B pushpull stage which a bit difficult to trouble shoot, new one's has IC's, for the vertical drive.

    First of all check for the correct value, see whether the resistor is supplying power to the vertical.

    check the where the leads of the resistor leads to, like one pin goes to the flyback and the other goes to a diode and then to a filter cap. so and so.

    then I'll tell u where to go from there.

    Don't worry U can fix it, just give me the right info

    Happy hunting

    Rifaa

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