Samsung DP14LS Service Manual page 29

6 Troubleshooting
6-2-4 S-correction Failure
Symptoms: Poor Horizontal linearity
– Corner: wide, Center: narrow or
– Corner: narrow, Center: wide
Are S1 and S2 OK at IC201's
Pins 9 and 10?
Yes
Are Q406 and Q408 OK?
Yes
Check and replace C431, C433, C434,
D412, D413, Q405, Q407.
Table 6-1.
31 ~ 35
S1 0 V
S2 0 V
* As CRT vendor and inch, there are differential items like C431, C433, C434, L401, R231, R441.
If you want to change a PCB board to another one that is for different CRT and inch, you have to change
differential items at schematic diagram.
6-2-5 H-Linearity Failure
Are code nomber and polarity
of L401 right?
Yes
Are C427, D409, R423 OK?
Yes
Refer to 6-2-4 S-correction Failure.
6-10
No
No
35 ~ 40 40 ~ 49 49 ~ 61
0 V 5 V
5 V 0 V
No
No
Are Q405 and Q407 OK?
Yes
Check and replace IC201.
Replace it.
5 V
5 V
Check and replace it.
Check and replace it.
No
Replace Q405, Q407.
DP14L*/DP15L*