Samsung SyncMaster CSH7839L Service Manual page 30

7 Troubleshooting
7-1-4 S Correction Failure
Check S1 ~ S5 signal.
S1~S5 signals are right at each
frequency block?
Yes
Check and replace Q409~Q413,
C430, C431, C433, C434, C435,
C437 and C441.
7-1-5 H_Lin. Failure
IC201 Pin 4 voltage varies with
different H_Lin. DAC values?
Yes
IC402 Pin 4 voltage varies with
different H_Lin. DAC values?
Yes
Check L402.
7-1-6 Invariable H_Size
IC251 Pin 28 voltage varies with
different H_Size DAC values?
Yes
IC401 Pin 6 output duty varies with
different H_Size DAC values?
7-4
No
Check and replace IC201.
No
Replace IC201.
No
Check +12 V, –14 V line.
Check some parts around IC402.
No
Check and replace IC251.
No
Check some parts around IC401,
IC251 Pin 28.
CSH7839L/CSH9839L