Panasonic 32 inch TV has horizontal lines across screen

The t con board or LCD panel of the tv is faulty. Can confirm by replacing the t con board.
If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

Sound like your Y-Sustain board has one foot in the grave. The Y upper buffer and Y lower buffer boards go when the Y Sus Goes too...

Filter capacitors (more than 1) in the main power supply

Sounds like 'bad' or 'dry' capacitors in the vertical deflection circuit. Please note that leaving the white line on the screen too long can burn in the screen, which is permanent damage.

this is a frame fault
the fact that you can still see the line when the tv is off is because you have been watching with the line and it has burnt into the crt.

time to buy a new tv

No,Ur vertical/horizontal IC is shorted or cold soldiers.Could be the parts that support the IC is also.

you need some caps changed in that set in vertical circuit
i usually change about 5 caps to cure the problem
caps go bad over time

Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.

I have seen this problem before.

The problem turned out to be caused by a poor solder joint on R530. This is in the HV
sensing circuit and is associated with IC501/ comparator. The resistor was replaced for
good measure and proper operation restored.

this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!