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My name is mar i have sharp t.v model no. 21V-A300XB

The picture is out of focus, i already adjust the focus control in the flyback but it still the picture is out of focus. i already replaced the electrolytic capacitors in the horizontal circuit but still it has no effect. please help me...

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Re: my name is mar i have sharp t.v model no. 21V-A300XB

Replace the crt base socket, it is not a costly component but make sure you get the same type and verify the connections. Good luck.

Posted on Jan 25, 2008

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Picture goes dark but there is sound

There are many cause of dark picture symptom of standard television.First thing to do is try to adjust the screen control adjustment located at the flyback at the lower parts.There are two flyback adjustment the focus and screen adjustment.The upper level is focus and the lower is screen control. If check also the CRT socket board section.This CRT board is compose of high voltage terminal coming from the high voltage supply.Check if there's a cold solder in CRT socket terminal and other parts around the CRT socket.The heater supply,the RGB cathode supply,and the screen supply are the supply of picture tube to be lights up.So try to resolder those parts of the TV.Avoid short circuit in the PCB board.Hope it will help you.Thanks..

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Focus control is on the Flyback there is 2 adjustments one is screen drive other is focus turn it untill you have clear picture.

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There is Flyback Transformer in TV and it has 2 control knobs, one is for Focus and 2nd is for G2 or screen voltage control. Adjust voltage by 2nd knob.

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Its possiable you have a Bad flyback transfomer or could be that all the pinns on FBT needs to be resolder and focus control on Fly be adjusted.Call your local shops for CHK out fee.

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At the rear of the tv there may be two controls on the right hand side marked "screen" and "focus".If the set is newer,you will have to remove the cover and look to your right.You will see a dark object with a black or red wire coming out of it's top.That is your flyback transformer.On this you will find these two controls.Adjust your focus with the one so marked.Be careful to only adjust this control while you watch your picture clear.PROMPLY put the cover back.

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Please help me with my sharp t.v model no.21V-A300XB

The problem could be with the CRT base socket, why don't you try replacing that? It is not a costly component, and it is easy to replace. Make sure you buy the exact same thing and verify connections.

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If you feel good about opening your set then you can try this: Look for the flyback (high voltage) transformer, with the thick red wire which goes to the top of the picture tube. There are 2 controls on the flyback transformer, focus (top) and screen (bottom)Turn the brightness and contrast all the way down and then increase the screen control until you see retrace lines, and then back it down until those lines just vanish. Return the brightness and contrast to normal and adjust the focus control, if necessary, for a nice sharp picture. Let me know if that brings your brightness back.

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When you replaced the flyback the new flyback is shipped with the screen and focus controls set at minimum. These are the 2 controls on the flyback itself. Turn the set on and let it warm up a minute, then slowly turn up the screen (bottom) control with a small flat-head screwdriver. When the picture is around normal brightness, adjust the focus (top) control until the picture is nice and sharp. Then, turn the brightness and contrast all the way down and set the screen control until you can just see the picture, just above the point where the picture vanishes. Reset the brightness and contrast settings and your picture will be back to perfect.

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