The TV first began showing signs of trouble with the vertical hold, the picture would slowly squeeze together. Sometimes this was fixed just by unplugging the TV. I would also like to note that there was also a small sparking when the TV was plugged in, or unplugged from the outlet.
The vertical hold was no longer a problem, but then the green was not appearing on the screen. When adjusting the screen with the controls on the flyback, the green would appear when adjusted fully to one side, appearing with bright trace lines and blurring out the rest of the picture. The picture returns to normal when adjusted so the green retrace lines are gone, but there is no green in the picture.
I thought that with all the problems this TV has with the Flyback Transformer, that I would replace it, along with the Horizontal Output Transistor. After doing this, and adjusting the screen level on the flyback, the picture was back to normal again.
But that didn't last long, when I went to make another fine adjustment on the flyback, the picture once again lost the green and would only appear when fully adjusted to one side.
Could this be a problem with a solding joint elsewhere on the board, or another component that is going out?
As is appears, not many local repair shop will work on a large screen standard TV, and being this set belongs to my retired folks, and they can't afford the expense of the repair shops that are out of town. Any help, or suggestions would be greatly appreciated. Thank you.
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Re: Green is going, going, gone?
I would suggest check the the secondary side of the power supply for around 130VDC if that voltage is found to be lower than 120VDC I would suggest to replace CP80 with a 100 mfd@250 vdc. Part # 218374 Check Globalsemi.com for these parts.
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You will need a soldering gun that has a smaller point and rosin core solder (smaller solder is better for this job) cost about $20-$30
Best way to fund the vertical IC without a diagram is follow the Green and Yellow wires from the yoke( coild around picture tube neck)
the Green and Yellow wires are the vertical winding and will get you close to the vertical output IC which should be standing straight up with about 8-10 pins going through the circuit board, using a magnifying glass verify if the pins have circle cracks around them and just solder them each heating them for a few seconds flowing solder to the pin not the soldering gun. verify that non are shorted (soldered) together that aren't suppossed to be. Sometimes the end ones or a few are together (usually a ground spot).
hope this helps
this symptons is caused by a breakdown in the vertical deflection circuit. hence, the trouble may be in the vertical oscillator, amplifier or output circuit. in most modern tv the vertical ic is usually composed of these said circuit inside. the ic have many pins, standing on a heat sink and smaller in size. try to check also the capacitors surrounding it. sometimes leaky capacitor may cause this problem. good luck!
sounds like one of the tubes is gone. RGB stands for red green blue. These colours are mixed together to make all the other different colours on your tv's picture. when one goes then you end up with whats left working.If tv is fairly old chances are its cheaper to replace then to try getting fixed. tv's have came down drastically in price lately because of such high demand and competition to the market.
There is a sevice menu but it is something a repair man has to adjust. Even to get to that menu is a matter of procedure. If the picture is not always squeezed down then adjustment is not the problem. If it is intermitant it could be a bad solder connection on the main board.Sometimes a bad vertical ic and leakey capacitors can be the problem..
Bottom line is there is not much you can do to correct the problem. You are going to need a service man
You does not mean about picture clarity before this problem occurs. Former the picture clarity is well and good means picture is not problem. There is a problem in horizontal deflection area.May be flyback transformer failure shows these type of problem. This service should be done by technical persons only.
The vertical output IC has stopped working. The vertical output IC is the part that drives the coils in the yoke that spreads the picture up and down. This could be because it has cracked loose from the board (solder joints) or it simply burned out. Sometimes a bad pump-up cap will cause the vertical output IC to short out, and when the IC shorts out it often opens up a small value resistor next to the flyback. This is a relatively easy thing to repair. A qualified tech will be able to tell exactly why the vertical output has stopped working and repair it for you.
All symptoms indicate a problem in the vertical circuit,the first thing to look for will be loose conection on the vertical output IC,sometimes this IC goes bad completly and it needs to be replaced.If you are familiar with soldering electronics you can take care of it but if you are not too familiar you can play it safe and take it to a servicer ,it will be a lot less expensive than if they come to your house.Let Us know how it goes or if you need more information.