It is part of the Q6FN series
try
https://www.servicemanuals.net/en/samsun...6drafxza-4
($18)
There are lots of free ones here, but you'll have to hunt for it --
https://www.smarttvmanuals.net/samsung/s...chematics/
there are also several options for entering the service menu of the Samsung TV. For example, option number one is suitable for televisions manufactured in Europe, option number two is suitable for televisions manufactured in the USA, Canada, and Mexico. All manipulations to enter the menu must be done with the TV set turned off (in standby mode). To end the service menu call, always press the Power button (turn on the TV).
Method 1 calling the service menu
Put the TV into standby mode, turn off the TV with the remote control, then press the buttons on the remote control: “Info, Menu, Mute, Power”, then the TV turns on and displays the service menu.
Method 2 of entering the service menu
Turn off the power. On the remote control, press MUTE and then 1, 8, 2 and POWER
Method 3 of entering the service menu
When the TV is in standby mode, press DISPLAY, P.STD, MUTE, POWER on the remote control.
Method 4 of entering the service menu
When the TV is in standby mode, press SLEEP, P.STD, MUTE, POWER on the remote control.
Method 5 of entering the service menu
When the TV is in standby mode, press DISPLAY, MENU, MUTE, POWER on the remote control.
Method 6 of entering the service menu
On the remote control, press MUTE, then press 1, 1, 9 sequentially.