Nokia 920C Service Manual page 16

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
Q632 Base driving voltage exists?
Yes
Done
5-2
No
Check IC201 Pin 39.
No
Check IC201 Pin 9.
No
Check IC201 Pin 10.
Check and replace Q632.
720C/920C