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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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1 Answer

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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

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Your fault it known as "frame collapse" because the pictures frame has collapsed. It may be caused by a bad solder joint or a failed component. Not a problem for a TV engineer.

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1 Answer

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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.

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The red picture tube is bad, you must replace before it cause damage to the boards.

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your power supply is getting weak

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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.

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I had this problem around the time my TV was 3 years old. I ended up having to get it repaired at a TV repair place, it cost me $375.

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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.

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