Could be a bad TV or it could be loose TV connections feeding to the back of the TV. Any poor or loose connections in the cable leads causes a loss of signal strength to the TV.
Old cables and connection supplying TV Cable to the house or apartment can cause this problem also.
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If the picture is too wide, both in vertical and horizontal direction your TV needs power supply adjustments. It is now running at overvoltage, and this condition may poise to another problems soon. Get it repaired soon. Its internal regulated voltage needs to be adjusted. You cannot do it by yourself. Get it repaired by the help of a technician. Don't switch on the TV till its fault have got rectified.
Sounds like the power supply has a bad capacitor. This problem can inject excessive 60 hz from the AC line into the vertical stabilizing picture system. The hum also my come from the same reason, bad or leaking filter capacitors. Cheaper just to buy a new TV or borrow another TV and connected to your system to see if the problem still occurs.
I gave this advice before:
It sounds like you have a convergence amplifier problem. There are many articles on the Internet on how to do this type of repair yourself, but what these articles fail to mention is that if done wrong the chances are your TV will be damaged even more. So I would suggest that if you do not know electronics, for you to take the TV to a repair shop or have a TV technician come to your house to check and recommend a repair strategy for your TV set.
Make sure your remote is totally away from the set.
Make sure the buttons on the set are not sticky
If both of those are ok, it's your E-Prom in the set. RCA's are notorious for this, not a major repair, maybe $75-100. The 8 leg e-rom is only about $6.00
If you feel comfortable taking the cover off the back, check the fuse that should be soldered into the board, near the power cable/etc. If you do not feel comfortable doing that, then you should have a repair shop take a look at it. It might be a cheaper fix than you think.
Did you change the resistor by yourself? I am not sure if your TV has manual adjust on the back of the TV that you can adjust. Some times turning the TV Off and unplug it from the wall helps because it resets the TV. Check your Back ground color and see what is the dominating color. Blue, Green or Red. If this doesn't work please call a professional to look at it.