Dpms Failure - Samsung CHB5707L/5237L Service Manual

7 Troubleshooting

7-1-2 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
Q622, Q621 Base driving
voltage exists?
Yes
IC601 Pin 1 output
2
voltage exists?
Yes
Done
7-2
No
Check IC201 Pin 20.
No
Check IC201 Pin 41.
No
Check IC201 Pin 40.
Check and replace Q622, Q621.
No
Refer to 7-1-1 No Power Supply.
WAVEFORMS
2 544 V (IC601, #1)
CH1 P-P = 544 V CH1 RMS = 332.4 V
CHB5**7L/6**7L/7**7L