the original body of my post is copied below. To it i will add the following facts.....
- to clear up the issue, the picture converges only from the top and the bottom, and the picture remains at the full horizontal length of the screen
-The problem occurs after the TV has already been on for a variable length of time (+- 20 minits) and never occurs when you first turn it on (this may be explained by some type of expansion due to heating????)
-the model number is: CF32E50 (Toshiba)
-chassis number: TAC9516
-manufactured apr. '96
I am going to attempt to resolder the verticle IC. But first I have a couple questions I was hoping some of you would help me with.
-How do I know where on the inside of the computer the verticle IC is?
-Is it on a heat sink?
-Which of the pins on the IC should I resolder, or should I just resolder them all?
please advise, and thank you in advance for all of your help
---------------------------ORIGINAL POST------------------- I have a Tobisha TV. It is 32 inches. I do not know when it was made but I would have to say late 90's, maybe 98-99. It is your standard old TV, not one of the new fancy ones that everyone is buying.
Here is the problem.....
The image on the television constantly contracts. The sound is perfect. When you turn the TV on the picture is fine. After a certain amount of time, which is variable and (seemingly) random, the picture slowly condenses to the center of the screen. It would seem like someone is squeezing the picture from the top and the bottom simultaneously. The picture squuezes into a rectangular box in the center of the screen, about 6 inches on the side, while the rest of the tv remains black. There is no squeezing from the left or the right. Sometimes this picture will flutter between 3 inches wide to maybe 9 inches wide on the side. Sometimes while in this state the picture will spontaneously jump back to the full size and stay there for a couple of minutes, only to return inevitably to the condensed version.
Upon smacking the top of the TV with my fist the picture returns to the full screen every time. If i only lightly smack it it will grow larger on the top and the bottom. So smacking fixes the problem temporarily.
I would appreciate any and all input anybody has on this matter. I am determined to get to the bottom of the issue and would not mind attempting to fix the problem on my own. Please let me know if anyone can diagnose the problem and reccommend a possible solution.
Thank you very much,
Best Regards,
Andrew Kotheimer