Vertical problem

Have you checked the capacitors in the immediate vicinity of the vertical IC.
I would especially look for capacitors that are bulging on the top.
Also i would use the original output ic, NTE crosses are not 100 percent reliable when you have fold over issues.

Your correct and another thing it sounds like there was a audio /video plug that was plugged into the wrong outlet

You can get the complete service manual here.

the whole board needs to be checked .as its the problem of overheated or burned ic and not the leaky capacitors .

ic401 will be  shorted it takes la78041. But it also had two shorted diodes #30b,which crosses to a nte7188.
 ,which in your  case needed 2 caps c421 4.7/50v and c427 100/35v . change both at same time. also in my search of the board c402 4.6 /160v had been puffed up either from the i.c. shorting or another potential problem so change while you are in there as well as resoldering the whole vertical/ horizontal circuit board.

it could be because of any component getting overheated on the main board.as they gets faulty due to overheat so its needs comple checking by a professional as they have replacement spare parts ready at their work shop and the exact fault can be acquired.

check out the capacitor number C13013 JC on the main board and its near by components to locate the faulty.which would be bulgy or burned up.also check out with meter.

Hi

You can enter into service mode and from there you can adjust your picute . You can do this by :

TV turned on
2. Press 'Mute' button on the remote.
3. Press 'Mute' button on the remote again and hold.
4. Press the 'Menu' button at the TV.

You are now in adjustment mode:

5Use the 'Channel up'or"Channel dwn' to select the item.
6. Write down the old value of the item before changing.
7. Use Volume up and down adjust the value.
8. When you have made all the adjustments you want turn the set off to exit.

exactly there are some faulty capacitors on the board causing this.check and replace the capacotor also dry solder whole board.