After a household power blips during bad weather, we have horizontal lines ....
Sometimes the horizontal lines aren't bad other times they are worse. They are dark lines that interfere with the picture, and sometimes portions of the picture associated with the horizontal lines are displaced . Please help... we really can't afford a new TV or a costly repair now...
Hi I have horizontal green lines (spaced evenly 1 inch apart) over the tv screen. Particularly noticable on dark areas of screen. It's a CRT Tv - about 4 years old.
It seemed to start after power blips a few days ago due to bad weather. Also child has been playing with a large magnetic near tv. ( I read somewhere that this can cause problems) Any ideas about what has caused this and is there any cure?
Re: After a household power blips during bad weather, we...
Unfortunately there isn't any way to repair your tv as the magnet has distorted the tube that is in the tv and with CRT becoming obsolete the repair is likely to be very costly so probably your chaepest option is to buy a new tv .
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I have not repaired this particular model. If you have a capacitor checker, I would start there. Chances are good you will find a couple of bad capacitors. Bad caps can lead you to an area of most concern. I think the problem is in the general power supply. Check with TVRepair Kits.com. They may have a power supply kit available. Sony TVs are know for wearing down power supplies. The other thing to check, may be the audio IC. Sometimes the audio IC will have a standby mode. This standby is exactly what it says. When you shut off your TV, the standby mode is awaiting a call for power on. These are the two areas to look in to. PS, the power supply is connected to the horizontal deflection, if the horizontal transistor is good, investigate that a bad cap near it is weak or bad. Then proceed to the power supply. Sounds complicated and may be so. As you learn, it is routine. And don't forget, some ofthese TVs are destined for the recycle center! Thanks for asking me. Sincerely, Matt of Matt Martin TV.
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!
This is usually a horizontal problem. The horizontal transformer may need resoldered. The Flyback may have a bad ground,A horizontal output transistor may be defective. A bad coil ground or even a vertical IC needs resodered at times. Different TVs have different problems and most are included above. The worse symptom would be a bad picture tube,and I find those very rare! So chances are very good this TV can be saved! Thanks for asking!
Your problem is due to failure of the vertical scanning circuits in your TV. This is quite common and is caused by aging components. Generally drying out capacitors
You got to be careful not to leave it on too long when the picture collapses, it will burn a permanent line across the screen.
If you are an electronics expert you can fix it if you get a schematic. If not please don't attempt to reapir it yourself since there is high voltage in side the TV.
The problem may get worse with time.
You are seeing retrace lines, Either you have a bad picture tube or your screens control ( on the flyback transformer) is set too high.
On some sets the focus and screens control is accessible without taking the cover off. If so there will be 2 small holes on the back of the set labelled "screen" and "focus"
insert a small screwdriver into the screen control and turn the control until the lines disappear.
If the set does not have the access holes you can stil perform the adjustement, but you should make sure not to touch anything else as there is high voltage present and it could be very dangerous/Lethal to touch the wrong thing
Failure in the vertical deflection amplifier section. This is usualy from failed components, and sometimes cold solder connections. Most of the time, I found bad capacitors, and sometimes the output IC or transistors (depending on the model type) that have failed.
Take the set to a service center for an estimate. You may find it more feasible to buy a new set depending on the parts that failed and the time involved to do the work.
the fault you are describing sounds like what we in the trade call dry joints, basically where components are soldered into the circuit boards in manufacturing, the joints become brittle and crack thus forming a poor connection which can vary with heat. well worth repair may need a couple of electrolytics aswell but i could do the job myself safely for under £100.