Dpms Failure - Samsung 551V Service Manual

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
Q602 Base
voltage exists?
Yes
Done
IC601 Pin 1 Output
2
voltage exists?
5-2
No
Check IC201 Pin 40.
No
Check IC201 Pin 5, Pin 6 and Q610,
Q602 operation condition.
No
Refer to 5-1-1 No Power Supply.
No
Check IC201 Pin 5.
Check and replace Q602 and IC201.
CONFIDENTIAL
WAVEFORMS
100 V (IC601, #1)
2
CH1 P-P = 100 V CH1 RMS = 325.8 V
AN15V*