View Full Version : Missing Scan Line

05-06-2016, 11:03 AM
New to working on flat screens, but no stranger to repairing analog TVs (paid for all my college tuition).

I'm working on an Insignia 24" LCD with fluorescent backlight. It appears that I am missing one horizontal scan line about 1/2" from the top of the screen.

What are the possible causes?

1. Bad flat screen
2. Bad driver circuitry
3. Bad connection

Thanks for any advice or help.

Tom (I still miss tubes and high voltage)

05-06-2016, 11:34 AM
Oh there's high voltage if you get across the inverter for the CCFLs ;)

Sounds like you have a dead "pixel line". This is typically not fixable, especially in smaller sets. It's just a bad panel (bad ribbon bond to the panel, bad panel itself, etc). Not usually repairable by the average Joe.

Sometimes (maybe 10% of the time) vertical lines are just a bad TCON connection. But horizontal lines are almost always not fixable in LCDs.