Vertical sweep repair

This is a problem related to vertical sweep section circuits inside. To know more about vertical sweep problems, and its repair, visit this site named "Electro-help".
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Hello
It may be due to an Integrated Circuit [IC] fault. Your TV has lost its vertical sweep, and the is why you see a norizontal bright line across the center of the screen. All TVs has bot Hotizontal and Vertical Sweep to spread picture on the screen. When Vertical sweep fails, you will see a horizontal line, and when horizontal sweep fails you will see a vertical line at the middle of the screen.
n your TV, most likley the vertical Ic is faulty. This is a common phenomena in almopst all telivisions. The said IC is diretly soldered into the circuit board inside your TV. To replace it you have to open your TV. Take all precautions before opening the back cover of your TV. You are going to work with an electrical equipment, and keep it in mind always. After opening the back cover, just locate where the Vertical Output Ic is. It will be normally screwed to a heatsink plate, inorder to radiate heat from it while working. You can locate it by the following method. Different TV circuits has different positions to this Ic. Just look on the Deflection Yoke [the coil fitted on the neck of picture tube]. From there four wires will go to the main printed circuit board. Out of which two of them will be thick, and other two will be thin. The two thin wires are the carriers of vertical sweep from main board to deflection yoke. Follow the the two thin wires. You will see it to be pluged into one point at the printed circuit board. Just upside down the printed circuit board, after pulling it outwards, not disturbing any of the wirings, and look through the circuit track, to which point the tracks goes to. Somewhere near to it you can locate the above said IC.
Just take the main input votage to that IC. It will be normally 18v to 35VDC. You must have multimeter to measure this voltage. If the voltage is there, look for any loose solderings over there to the legs of that IC. If there is any soldering loose, the IC will not work properly, and vertical sweep loss will be the result. If there is proper voltage check the voltage at the output pin of that Ic. It should be almost half the voltage of the supply voltage. If it is not there, make sure that the IC has damaged.
Resolder it out from the board, and go for a same type and number. Replacing it will solve the problem. Normally vertical output ICs are not very cosltly. Here in India, all types of vertical Ics will have a price rate between 80 to150 Indian rupees, that is upto four American Dollars. Ok.

take the back cover off there shoulde be one or more little knobs so you can adjust the tv

yes, its dry solder joint problem in Vertical Deflection Area. If you know how to repair TV, then open it and resold vertical output IC pins and surrounding parts with solder iron and solder wire.

Bad vertical output IC.

Already post other solution about this. On Sony TVs, the common problem is loose connections. Your TV have a ssb ( vertical position) unplug and re solder. Other thing, Tuner will be in loose connection too. Try and I hope this work for you.

It a problem in the vertical sweep circuit my freind. It could be the vertical IC, a capacitor thats bad the B+ sweep supply, or a bad connection on the board, but my moneys on the first, a bad vertical output IC. if you lug the thing into a repair shop it should not cost you over 125 to 150 bucks. if you have solid state serviceing as well as soldering experience you can get a service manual and find the vertical output IC and replace it. You stated you had no electronic experience on TV sets? Play it safe and let a pro assist you with this repair. Good Luck Please dont forget to rate this thread.

I believe the cable guy is correct and I will suggest you call for professional help now,if you try to use it like this the problem might become expensive.

I think what your asking is for an on screen service menu?? That wont fix your problem. It sounds like you have a vertical height problem where the screen doesnt fill the entire screen with the Picture. The adjustments wont go out like that for no reason and all by them selfs. The vertical sweep IC went bad and is going to have to be replaced. This is not a job for the end user. You should call an experienced tech to assist you with this repair. Good Luck

sounds like it could be a problem in the vertical sweep curcuit as if the vert sweep fails it blanks out the video and screen drive so the tubs dont get a line burnt into the face of the picture tube. Have this checked out by a pro as I doubt if you can do this repair unless your an electronic tech.. Good Luck