Samsung LB15VS Service Manual page 21

5 Troubleshooting
5-1-2 DPMS Failure
Check signal source
H/V sync. video level.
Make no H/V Sync. (power off
mode)
LED blinks?
Yes
+12 V line off?
Yes
IC601 Pin 1 output
2
voltage exists?
Yes
Done
5-2
No
Check IC201 Pin 40.
No
Check IC201 Pin 5/Pin 6 and
Q624, Q625 operation.
No
Refer to 5-1-1 no power
supply.
WAVEFORMS
2
332Vpp (IC601, #1)
LB15VS/LB17LS/LB17KS/
LB17LT/LB17KT