I've been having problems with my t.v. picture shrinking and going out completely. I tried turning it off for long periods of time and it seemed to work fine for a couple of weeks after that. Then it started again so I tried the tap method around the shell and it would make the picture come back most of the time. Then it finally would just come on with blank screen and sometimes a reduced picture. I took the back off and dusted it out and then looked for loose connections and solders. Really didn't see any but did make sure everything was tight. Now I've got the t.v. on and it's been working for about an hour & 1/2 with no problems. Any suggestions as to what the problem may be? I thought originally it was a power supply but now I'm not sure at all. I'm sure it will go back to losing the picture again unless I repair it.
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Re: picture keeps shrinking and going out
Could'be a crack on the main chassis , or, bad capacitors with or around the vertical output ic . cost to repair around 80.00 to 125.00 this need to be rapaired as a component level
because the main chassis is no longer available and its better to be repaired by a trained technician . a person ith no experience onthis chassis culd damage another component very easly. if you need more to know let me know , thanks
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This is a common problem on certain models of Philips Magnavox TV sets. The most common symptom is the screen will shrink and expand over and over. After the TV heats up for a while the video will work like normal. After a few weeks or months your TV will eventually stop working and not have video. You can get complete parts and instructions from www.TvRepairKits.com
You will need a photo-editing software in order to shrink the image file. If you have a more high-end photo editing program such as photoshop, you can simply go to image > image size, and then input a lower resolution.
Otherwise, you can shrink it using microsoft paint. Open the image file in paint, then go to the image menu, and select the resize/skew item. Keep in mind that your phone only has a 400x240 resolution, so any photos larger than that will not show any better on your phone. If you took this photo from a handheld camera that is 4 or fewer years old, you'll probably want to shrink the photo to 20-30% of its size. Then, just save the photo as a new file, and make sure you save it as a JPEG in the drop-down save menu, or your phone may not recognize the format.
You are changing parts in the wrong circuit. The problem is in the vertical circuit. Look for the vertical IC and resolder the pins first. It should be an LA7837 or something similar. Also, check the 100ufd and 47ufd caps in the same circuit.
If you have no sound or video or if your screen keeps shrinking and expanding its typicaly the opto chip. You can get the chip and repair instructions from www.magnavoxhelp.com . This is a fairly common problem.
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.