Samsung TXM2796HFX/XAA, Service Manual, Page: 14 / 77

Alignment and Adjustments
4-2 Samsung Electronics
4-1-3 Screen Voltage Adjustment
1. Enter the Service Mode by pressing the remote control keys in the following sequence
: Power Off Mute 1 8 2 Power On
2. Initialize all set data.
3. Input a Toshiba pattern.
4. Use an oscilloscope to identify RK, BK, GK. And then adjust FBT Screen VR so that the voltage of
pedestal level doesn’t exceed 175V.
If a Toshiba pattern is not available, cancel the blue screen and input “No Signal” to AV IN so the voltage
of pedestal level doesn’t exceed 188V.
If an oscilloscope is not available, use a DC multi-meter in No Signal (black screen) to adjust RK, BK, GK
so that the highest voltage becomes 175Vp-p.
4-1-4 White Balance Adjustment
1. Warm up the TV set for at least 30 minutes.
2. Enter the Service Mode by pressing the remote control keys in the following sequence: Power Off ->
Mute 1 8 2 Power On
3. Initialize all set data.
4. Input a Toshiba pattern.
5. Using a probe (CA100), do the White Balance adjustments.
a) Adjust Low-Light.
- Adjust Sub Brightness to set Y.
- Adjust B Cutoff to set y.
- Adjust R Cutoff to set x.
b) Adjust High-Light.
- Adjust Sub Contrast to set Y.
- Adjust B Drive to set y.
- Adjust R Drive to set x.
c) Check the value of Low-Light. If necessary, readjust Low-Light.
d) Check the value of High-Light. If necessary, readjust High-Light.15