Remote control key sequences.

I don't have service mode specifications but I do have a Samsung and looked around for how to get it in service mode some time ago because the HDMI cables somehow disconnected themselves a lot. Thought it was an electronic problem but it turned out to be a parenting problem instead SO I have never used this information and can not vouch for it. I cut and paste it from a note I copied from a forum entry to use at your discretion:
First post:
To enter "Service Mode" Press the remote - control keys in this sequence :
From Standby Info-Menu-Mute-Power On
- The buttons are active in the service mode.
Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left, Arrow Right, Menu, Enter, Number Key(0~9)
Careful though there are things you shouldn't touch in this menu.

avforums.com/forums/lcd-led-lc­d-tvs/601553-samsung-service-m­enu-research.html

Another post:
Method 1
Put TV on standby and then push in series these buttons on the remote: 'info, menu, mute, power' the TV will then turn itself on and display a menu.
Method 2
Turn the power off. On the remote, press Mute followed by 1, 8, 2, Power in sequence.
Method 3
With the TV in standby, press the {DISPLAY} {P.STD} {MUTE} {POWER} on the remote.
Method 4
With the TV in standby, press the {SLEEP} {P.STD} {MUTE} {POWER} on the remote.
Method 5
With the TV in standby, press the {DISPLAY} {MENU} {MUTE} {POWER} on the remote.
Method 6
With the TV in standby. On the remote, press Mute followed by 1, 1, 9, Enter in sequence.
Samsung LCD Monitor Service Menu Instructions

End quote.
Good luck. Just a basic suggestion you probably don't need: keep track of any changes made by writing them down so you can put it all back if you have to.

How to turn on PIP in Samsung TV SAMSUNG STEP 1. OPENING MENU SETTINGS


Click here to know about PIP in Samsung TV.
a). Press MENU key ( ) from TV remote.



b). Select Picture option and press ENTER key ( ) from TV remote.



c). Select PIP option and press ENTER key ( ) from TV remote control.

STEP 2. TURNING ON PIP SETTINGS

d). PIP window will open on TV screen. Select PIP and press ENTER key ( ) from TV remote control.



e). Select On option and press ENTER key ( ) from TV remote control.



f). Enjoy watching PIP screen.

The remote's volume keys are "punch-thru" keys, meaning they'll work for the TV for which the
remote is programmed no matter what mode the remote is in. It seems your remote is not
in "TV mode," but the punch-thru keys (volume UP/DOWN) are working.
The Solution: change the remote from "AUX mode" or "DVD Mode" back to "TV mode", by
pressing the "TV" button at the top of the remote.

Either that, or your remote keypad has failed with the exception of the Volume UP/DOWN keys....
Also, your batteries may be failing, since it takes a tiny amount of energy to light
the IR (infra-red) LEDs at the front of the remote to change the volume.
Is your remote a "multi-function" remote?
Could help more if you could post your Samsung remote model number, since
www.samsungparts.com lists 37 pages of TV remotes (at 10 models per page).

The remote control provided may not be the exact one for your Samsung TV.

The remote interface of the TV died on mine, it was intermittent then it stopped completely. Remote control is fine, it's the remote sensor in the TV itself.

in order to reset a locked out TV you must contact Samsung technical support, they are the only ones that give you a override code to reset the lock out. the number is listed in your owners manual.

Normally a samsung tv has a warranty until it's over two years old. So i'dd contact samsung about it and ask them.
With kind regards,

Jeffrey

The auto focus is not actually focusing the tv. When it is running it is adjusting the convergence. Most likely the repairman that replaced your tuner didn't plug the sensor wires back in. I would call him back out and have him hook it back up.

There should be a convergence menu in the tv. Use the samsung remote and go into the menu and look for convergence.

Unless you had the remote tested by Samsung, the test isn't comprehensive; it will only tell if the remote is putting out infra-red of some kind, that type of tester cannot determine if the codes are correct or complete. The only true test would be one in which you had a second TV or a second, known working remote. Even using an oscilloscope with an infra-red detector wouldn't help unless one had the specific code sequences available, it would only appear as a pulse train. 

I found an mdx file at
http://www.remotecentral.com/cgi-bin/files/rcfiles.cgi?area=mx700&db=devices&br=samsung&dv=television&md=hlr6178w&kw=&st=&ar=&dt=&so=author&pg=1&file=mx700/devices/tv/sam-tv-slr6178w.zip

hope this helps you