Samsung LB15VS Service Manual page 34

5-2-4 Visible Retrace
Check white balance
adjustment.
G2 voltage is right?
Yes
Blank pulse at Pin 3 of
IC401?
Yes
V_FLB pulse at
23
collector of Q511?
Yes
Valid the vertical pulse
24
on CRT socket G1?
Yes
Done
LB15VS/LB17LS/LB17KS/
LB17LT/LB17KT
No
Check T501.
No
Check IC401.
No
Check Q511.
No
Check CN102 and CN201.
5 Troubleshooting
WAVEFORMS
23
5.00V (Q511, Collector)
24
20.00V (CRT Socket, G1)
5-15