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To repair a tv set

TV comes on sound all ok accept picture verry bad,has all these lines across the screen .

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If it has white out with screen retrace lines it means that the 130-200 volt line is missing from the flyback transformer to the neck crt board. begin by checking if the .68ohm to 1ohm fusible resistor is open circuit.if it is then you either have a defective rgb drive chip, or in most sets a shorted drive transistor. a defective gun in the tube can also take out the fusible but unlikely.

Posted on Jul 09, 2008

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Posted on Jan 02, 2017

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White lines across tv screen


Without seeing the lines I can't be sure what your set has wrong, but here are a some possibilities:

If the lines are lines are confined to the top inch or two of the screen and the picture looks otherwise normal, the trouble is bad capacitors in the vertical output circuit. Fixable by replacing the bad parts.

If diagonal lines are across the entire face of the picture tube and the picture looks washed out, the trouble is often a bad capacitor on the 200-volt line to the picture tube. This may be on the main circuit board near the horizontal output transformer, or on the small circuit board plugged onto the end of the picture tube. Again, replacing the bad capacitor can fix this.

If your TV is actually an RCA, someone may have bumped a rear-panel adjustment. On the back of the TV near the bottom right are two small knobs. RCA left these adjustments exposed inside of putting them inside the set like other manufacturers. These sometimes get bumped if someone was behind the set cleaning, or if a pet got back there and hit them with a tail. The top knob adjusts focus, and the bottom knob adjusts something called G2 or screen voltage. If this gets turned up too high it can cause the faded picture and diagonal white lines. Turn the adjustment down until a black screen looks black instead of gray.

A bad picture tube or horizontal output transformer can also cause lines through the picture. If this is the case with your set, it's time for a new TV. The transformer is relatively inexpensive but labor costs aren't, and the repair bill may exceed $200. If the tube is bad, there's no point even considering repair. The tube cost alone exceeds the cost of new TV.

Hopefully your lines are easy and cheap to fix. Good luck, and thanks for using Fixya!

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1 Answer

SAmsung has two white lines across screen with no picture


If the 2 white lines are in the centre of the screen it sounds like you have a fault called 'field collapse' . The 'x' or horizontal circuit on the tv deflects the beam across the screen which in your case is ok because the line runs across the screen ok. The 'y' or field circuit on the tv deflects the beam down the screen. Without a circuit diagram for your tv i cannot point to individual components.

Aug 07, 2009 | Samsung Televison & Video

1 Answer

Horizontal lines across TV screen Panasonic CT-31SF13U


The problem sounds like a vertical deflection issue form what you describe.
On average they are usually in the simple repair categories. On average they would run in the $50 range if you take it to a reputable repair shop.
There are several possibilities
Bad capacitor (s)
Bad vertical IC
resistor in the power supply to the vertical circuit changing value

Jan 24, 2009 | Zenith B25A10Z 25" TV

1 Answer

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IO board has bad solder joints or is bad if you tap the outside firmly it will come on for a while

May 28, 2008 | Toshiba CF36G40 36" TV

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Its known as 'screen collapse' and yes it can be fixed but it may not be economical you should get some quotes from your local tv repairers.

Nov 14, 2007 | Televison & Video

1 Answer

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Hi. No this is a run of the mill fault not that complicated. Repair shop should be able to repair with out any problems.

Aug 28, 2007 | Toshiba 28N33 28" TV

2 Answers

Vertical fold over


if the set has a previous vertical line problem and a white horizental line only comes in the cross of the screen and you turned the tv on for a time while the problem is solved that mean you have make a burnt line to the screen , but if you are the tv owner and nothing of that happens so you have a problem in faulty dried capaciter in the vertical live part search for 33uf 160 v or 22u 160 v and alter regards please don't forget to rate thx

May 01, 2007 | Sony KV-32S45 32" TV

4 Answers

Jvc av-27730 27"


One thing you should not do with electronic devices which have a start up proceedure is to turn the power off, and then on again without a wait of about five minutes. Some equipment manuals warn you about this, and specify a longer period. The start-up has to have time to reset. It will be more likely to reset if you do not leave it on standby, and even unplug it. In your TVs case you need to describe the distorted picture as it may give a clue to a fault, or incorrect start-up. The horizontal line indicates the frame timebase had stopped working. No picture could be a fuse blown inside the set, or a timed cutout which may reset after a time. Try after several hours to see if it comes on. If it is just the frame timebase (vertical) it is worth repairing.

Oct 22, 2006 | JVC AV-27230 27" TV

7 Answers

No picture when TV is turned on, sound is OK


Lets try something ,turn the set on and put you forearm in the face of the picture tube if your hair stand to static it means you have high voltage and your set is missing possible the screen or filaments volts,if the hair in your arm does not stand your set is missing the high voltage and the problem is related to the flyback but it does not mean is bad ,it could have a loose conection in one of the legs or in the near area,next time it happens tap on the side of the set to see if it reacts if it does you know you have a loose conection.If you are familiar with tv service this will be a good place to start but if you are not too familiar be safe and call for assistance from a servicer.Let Us know if you need more information and how it goes.

Oct 13, 2006 | Samsung TXJ2554 TV

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