Samsung LB15VS Service Manual page 27

5 Troubleshooting
5-1-15 Dynamic Focus Failure ( Only 17" Function)
IC401 Pin 32 output is
12
right?
Yes
Some parts around Q551
are right?
Yes
T561 Pin 6 input is
13
right?
Yes
T561 Pin 1 output is
14
right?
Yes
Check the connection between
FBT focus pin and CRT socket
PCB.
No
Replace the IC401.
No
Replace failed part.
No
Check and replace C443.
No
Replace the T561.
WAVEFORMS
12
0.58 Vpp (IC401, #32)
13
50.0 V (T561, #6)
14
380 Vpp (T561, #1)