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Question about Zenith B25A74R 25" TV

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Zenith ss2504ew9 has no vertical picture

It has no vertical only a thin horizontal line in the middle

Posted by Billy osborne on

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Anonymous

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Either the vertical output is bad, or connections need resoldner at that point. Usually resoldnering takes care of it

Posted on Nov 20, 2007

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1helpful
1answer

Zenith tube tv has thin white lines but no picture and I can hear audio

Hello jreese, Hi, Most definitely its a horizontal output problem, your tv has no horizontal deflection to pull the screen vertically, the power transistor that produces the high voltage is bad, this needs to be replaced. definitely you always have sound, the audio section is a separate block from the high voltage block, go look for a technician to have this checked.
1helpful
1answer

Blank screen except for a single horizontal line through the middle of the screen.

Hello

Your TVs vertical swee sction has failed. All CRT based TVs have both vertical and horizontal sweep sections to sweep the picture both in vertical and horizontal direction to display it on the picture tube screen. This process is otherwise called as scanning. If vertical scan section fails, you will see a horizontal line at the middle of the screen and if horizontal scan fails, you will see a vertical line on the middle of the screen.
You have to open your TV to retify this fault, as the fault lies in the internal circuit board. Open it after disconnecting it from the mains wall socket, and locate the vertical output section inside. It is very easy to locate. On opening you can see a coil fitted on the neck of the picture tube, called deflection yoke, and there will be four wires from it goes to the main board. Out of which two of them will be thick, and the other twos will be thin. The thick wires are usually colour coded as red and blue. Just follow the two thin wires. You will reach to a plung in socket to which these four wires together connected. Turn upside down the circuit board, and follow the print track through the print side of the above said two thin wires connection goes. it will go to the vertical output section.
Before doing any thing, first look into the circut board for any loose or bad solderings are there. It is a common fault that this section have loose solderings on it, because most of the components will heat up while working. Repeated heating and cooling, make loose soderings to emerge.
Resolder all the suspected points, as loose solderings will be microscopic,a nd acnnot be detected very easly. We in the service field also will fist do this.
Usually vertical output section is composed of an IC related circuit. Solder all pins of that Ic first and feel the effect. If this does not help, desolder the IC out of the board, will be screwed on to a metal heatsink, go for the same type and number. Replacing the IC will solve your problem.
If you wants any more assistance, feel free to contact me through Fixya. OK.
0helpful
1answer

Picture has been reduced to a thin line in center of set sound and remote functions still work

Hello
Your TVs vertical output section has the trouble. All TVs have both vertical and horizontal scanning sections, which scans the picuture on the secreen both vertically and horizontally, to get a picture frame. If horizontal scan fails, you will see a vertical line at the middle of the screen, and if vertical scan fails, there will be a horizontal line across the middle of the screen. Your TV has the second stated trouble. To get it rectified, you have to open your Tv.
Unplug your TV from mains socket and open it. Locate the vertical output section. It is so easy to locate. Your TVs picture tube neck id fitted a coil alongwith it, which is called the deflection yoke, and it will have four wire connections. Out of these four wires, two of them will be thick, usually red and blue in colour, and the other twos will be thin. Just follow the two thin wires, you will reach to a point that these four wires are plughed onto a pin connection, on the main printed circuit board.
Upside down the board, and trace the track to which these two thin wires goes, through the print side, will reach to the vertical output section.
Normally this section consists of an IC for this purpose, and can be screwed onto a metal heatsink, as it will get heated when it works. Before unsodering it , just look at the soldering points of this IC pins for any loose soldering points. Loose soldering are very difficult to locate, as thay will be very minute up to microns, so resolder all the pins of this Ic, by applying a little more solder, and see the effect. Sometimes this will resolve the problem. If not go tho the main input voltage that goes to Ic pin. If it is not there, check out the reason. If it is there and still vertcal scanning does not occur, resolder out the IC from the circuit board, and go for a same type and number.
If you wants anymore asistance, feel free to contact me through Fixya. OK.
0helpful
1answer

Thin horizontal line of picture

that is a vertical deflection circuit problem. try to check a 470 UF capacitor connected to the vert. yoke coil if it is open or try resoldering the nconnecrtion at the board. if not, try to replace the B+ filter of the vertical amplifier. another is try to chexk if the vertical moscillator is qworking if you know elecrtonics.
0helpful
1answer

Picture appears only as a thin, horizontal line...

chk vertical amp /vertical drive i/p from oscillator/power to it/power to vertical amp/chk dry joints-hot area/look at vertcal amp capacitors-swelling etc
2helpful
2answers

Picture is squeezed down to middle with a bright green horizontal

Replace the vertical IC you will need to discharge the flyback and replace the IC it can be done if you know what your doing but there are a lot of youtube videos to show you how this is to be done.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

0helpful
1answer

No Picture

This is a problem with the vertical circuit. If you can solder, you should be able to fix this. With teh unit unplugged, open up the back and locate the vetical IC. This should be a small flat IC attached to a heatsink with about 9-11 pins. It may be marked LA7837 or something similar. Try resoldering hte pins. If that fails to resolve the problem, replace the IC. I will look up your specific model and try to get more details.

Dan
1helpful
1answer

Tv not working

this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!
2helpful
1answer

Picture goes to one thin horizontal line in middle of screen

There is a bad solder connection in the vertical sweep circuit. if you know how toi solder, go and find the vertical output IC and resolder that first.. but if you have no solid state electronic repair experience, please find a trained tech to assist you in this repair, as if you wait it may end up costing you double of what it would now, so haveit done ASAP. Good Luck Please do not forget to rate this one.
1helpful
3answers

I have a thin bright white line,horizontal,no picture

i have panasonic sophia tv 29" i have white horizontal line on middle of screen i know i have to solder ic but where is the ic located on main circuit board. thankx
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