Other Adjustments - Samsung SP43T7HPS Service Manual

4-4 Other Adjustments

4-4-1 Screen Adjustment
1. Warm up the TV for at least 30 minutes.
2. Select the "DYNAMIC" Video mode.
3. Trun to the Video Mode(No Signal) using a
remote-control.
4. Connect an oscilloscope to RK, GK, BK.
5. Adjust the VR (VR501, VR531, VR561) screen
so that RK, GK, BK pulse is 20Vp-p each.
(Turn the R,G,B VR screen fully
counterclockwise in the area of each flyback
line.)
4-4-2 White Balance Adjustment
1. Select the "DYNAMIC" video mode.
2. Input 100% white pattern.
3. In the stand-by mode, press the remote-control
keys in the following sequence:
Displsy → Menu → Mute → Power ON
4. Warm up the TV for at least 30 minutes.
5. Input a 10-step signal.
6. R-cut off, B-cut off, and G-cut off by pressing
the Volume +/- keys.
7. Adjust the low light with viewing the dark
side of the screen.
8. Select R-drive, G-drive and B-drive by
pressing the Volume +/- keys.
9. Adjust the high light with viewing the light
side of the screen.
10. If necessary, redo adjustments 6~9.
11. Press the Menu key to exit.
4-6-3 Sub-Brightness Adjustment
1. Input a sub-brightness adjustment signal.
(TOSHIBA PATTERN)
2. In the stand-by mode, press the remote-control
Samsung Electronics
keys in the following sequence :
Displsy → Menu → Mute → Power ON
3. Select Sub-Bright by pressing the Volume +/-
keys.
4. Adjust so that the 63 step on the right side of
the screen is not seen (Use the Volume +/-
keys).
5. Press the Menu key to exit.
4-4-4 High Voltage (30KV) Check
PRECAUTION
1. Input a lion head pattern.
2. Select "DYNAMIC" video mode.
3. Warm up the TV for at least 10 minutes.
4. Use a digital multimeter.
ADJUSTMENT
1. Connect the (+) terminal of the digital
multimeter to Q471 and the (-) terminal to
Q401 (located on the deflection board).
2. Adjust RR471S (located on the sub board) so
that the digital meter indicates
DC290V ± 0.1V.
4-4-5 F.S. (Fail Safe) Circuit Check
(GT430,GT431)
Note : The F.S. Circuit check must be performed
after servicing.
1. Turn on the TV.
2. Select the "DYNAMIC" video mode.
3. Short F/S Test point (located on the SUB PCB).
Then, both sound and picture disappear.
(Note: Even if the shorted terminals are
removed, both sound and
picture do not appear. This proves the F.S.
circuit is working. )
4. To restore both sound and picture, turn off the
TV and reset it after about 30 seconds.
Alignment and Adjustments
4-15