My 21 inches lg tv produces sound but a very dark

Yes it can be fixed . it is possible that you might have your TV's Y-sus malfunctioned so it needs to be changed If you tell me the model of you 60" tv i might be able to supply you with more informations

ok ur tv powersupply is ok but horizantal is not working chk ur fbt hot & micronass

I think you need TV tech to check for some busted parts, its internal problems .

It sounds like you have lost the vertical sweep circuits, it can be the Vertical out put IC is bad, Vertical yoke winding is bad, caps is bad. You will have to open it up, but you must be real careful since the picture tube can hold high voltage (24~30,000 Volts) for a long time after the monitor is unplugged, you will need to discharge the picture tube first before working on it. You may want to leave this to the pro.
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connect audio output (RCA Jack white n red color) from the video, to the audio input of your TV. Make sure you use same AV channel for the video and audio.
i.e AV1 or AV2 or AV3

If you have sound the problem is most likely the LCD panel but if you have no sound then it is going to be the main board.

sound is not very after 19

Most likely what happened is one of the capacitors went bad. When a capacitors goes bad it produces a popping sound. This could be an easy and cheap fix if you find the bad capacitor or capacitors. The bad capacitor will have a bulging top most likely on the power board but could be anywhere.

LG tv flatron no sound, picture everything else is fine but no sound what can be done to fix it