Question about Sharp 27C-240 27" TV

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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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  • Anonymous Mar 12, 2014

    Model 21v-fr95s



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Si tu change l'element blanc(CRT base socket) qui est sur le canon du tube cathodique et tu n' as pas de resultat favorable change le THT pour voir.

Posted on Feb 10, 2008

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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.

Posted on Jan 24, 2008


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Posted on Jan 02, 2017

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SOURCE: 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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Brightness Problem


Since focus adjustment using the flyback rear controls (EHT) has no effect, then it could possible mean two things:
  • the EHT is defective (most likely) at least the controls; or
  • the picture tube is already weak.
A workaround is to replace the filter capacitor of the ~70V leading to the collector voltage of the 3 color drive transistor. Normally used to replace with is 100uF/160V.

Of course best would be to have the EHT checked/replaced.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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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 control bottom control is screen or for brighter picture.

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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.

Jan 02, 2008 | Televison & Video

1 Answer

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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.

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1 Answer

I have sound but no opicture

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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