Please help me with my sharp t.v model no.21V-A300XB
The picture is out of focus, i already adjust the focus control in the flyback but has no effect i already check if there is any cold solder and has replaced electrolytic capacitors around the horizontal circuit but has no effect..
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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..
Congrats on changing the fly and getting it to come on. If it is a sony as it looks at the top of this page (accurate model?) need only to adjust focus and/or the horizontal static control. can't tell you where the horizontal static control is exactly but there are large wire associated. If not a sony then adjust the focus on the flyback.....top control bottom control is screen or for brighter picture.
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.
your problem is in focus control ckt.please check
1 focus wire going to crt base from flyback transformer is loose or foreign material deposited in crt base near that wire.
2 focus control mistuned.
3 if tv is old than crt is weak.
hope this will help.
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.