I know the line is horizontal but the problem is in the "Vertical" circuit of the set that deflects the picture from the middle of the screen to the top and bottom.
Only a few easy possible reasons for this.
1) set has developed bad solder connections in the vertical output circuit--it happens as a normal thing and most sets like this the picture will have opened and closed before going to just a line.
2) a part in the vertical output circuit is bad---most common is a IC chip for output. Not real hard to get at or replace and is inexpensive.
If it is as stated here a 27 inch set it may not be economical to fix and cheaper to just consider replacing it.
Answers & Comments
I know the line is horizontal but the problem is in the "Vertical" circuit of the set that deflects the picture from the middle of the screen to the top and bottom.
Only a few easy possible reasons for this.
1) set has developed bad solder connections in the vertical output circuit--it happens as a normal thing and most sets like this the picture will have opened and closed before going to just a line.
2) a part in the vertical output circuit is bad---most common is a IC chip for output. Not real hard to get at or replace and is inexpensive.
If it is as stated here a 27 inch set it may not be economical to fix and cheaper to just consider replacing it.
Let me know if you have questions.
SD TECH