hi
I think your TV have a trouble inside lcd panel
the controller board contains driver IC. Deffective driver IC can cause of line display.
Three reasons why one vertical line accross screen can happen in LCD;
1.The missing signal from the controller IC to
LCD driver.
2. LCD driver IC itself defective
3. Dry contact in the tape carrier package.
Use masking or electrical tape to mark it where the line was located. press it if the line back to normal but when release your hand came back i think it was intermittent. Open the LCD panel
Use robber
Place the rubber on the top of TCP
Gently close back the top casing
Good luck...
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