Samsung lnt4069f horizontal lines and screen flickers on all inputs resetting does not help

There are some ideas here, but you are likely to need a service centre. Also help in the videos.

Samsung TV Has Horizontal Lines On Screen

iFixit https://www.ifixit.com > Wiki > Samsung_TV_Horizo...
Your Samsung TV has lines running across the picture. They mess everything up. You don't need horizontal bars in your view. We will walk through some things ...

Lines on Samsung TV screen

Samsung https://www.samsung.com > ... > TV & AV
Apr 13, 2023 - Troubleshooting. 1 Check whether the lines on the screen are moving or permanent. 2 If the lines sway, check the input source (HDMI 1, Video, ...

If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

Need to check removing LCD ribbon cable in the monitor. but it is may be a damage of LCD screen ,need to replace the lcd.but in very first check and service the lcd.

EASY How to Fix Samsung LCD TV Flashing Flickering ...

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www.youtube.com/watch?v=i-jQZ-TQdgU
Jun 4, 2012 - Uploaded by Tampatec How to Fix Samsung TV Flickering Blinks Flashing Flat Screen ... Rating is available when the video has been rented. ... sorry to bother you tampatec but i have a RCA tv it works great when it's.... My Toshiba Full HD led tv model 32PT200ZE is having issues of screen blinking/flashing and horizontal lines.

Without a proper screen, you can't do a factory reset to this set. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

separate wiring. touching wires creates cross-talk of signals.

check connections on top of screen this is becoming a stockfault on samsung tvs

maybe there is something near on your screen like Magnet or any devices that can cause the black line.. try to remove any gadgets or any thing near your screen

Open up the TV and unplug and re-plug the connectors to the circuit boards. This is most often caused by a poor connection of the circuit board connectors.

The set is under a year old and is under warranty. The LVDS cable inside these sets have a history of coming loose. The problem could be the panel. Either way, the set is the problem and needs to be looked at. This set is worked on in the home and does not need to be taken to a shop, so, you can still use it. Contact Samsung at: 1-800-SAMSUNG Hope this helps.