Samsung TXT3093WHX Service Manual page 79

Troubleshooting
6-3-4 No Raster
1. When the Power Board is normal
Screen
VR
Replace the
Regulator Board.
Check R424 and
R425→ 0.47ohm
6-10
Single Horizontal Line
Check the Regulator Board B+
Yes
Check the FBT output voltage
18V,-18V
Check the VD_P/VD_N port
of the System Board
No
Check SCL-M5/SDA-M5
of the System Board
Yes
Check DIC01 (CXA2165)
of the System Board.
Yes
Replace the
System Board.
Yes
Check the
CRT Ass'y
Check the
Heater Voltage
Check R529
Check if IC505
47
78R12 is 12V.
Yes
Check IC301 (STV9381)
No
No
Replace DIC01 (CXA2165)
of the System Board
Samsung Electronics