Samsung CHA4217L Service Manual page 34

7 Troubleshooting
7-2-4 S-correction Failure
Symptoms: Poor Horizontal linearity
– Corner: wide, Center: narrow or
– Corner: narrow, Center: wide
Are S1 and S2 OK at IC202's
Pins 14 and 15?
Yes
Are Q404 and Q405 OK?
Yes
Check and replace Q406, Q407,
D406, D407, C422, C423, C424.
Table 7-1.
31 ~ 36
S1 0 V
S2 0 V
* As CRT vendor and inch, there are differential items like L401, C422, C423, C424, R426, R212.
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.
7-2-5 H-Linearity Failure
Are code nomber and polarity
of L402 right?
Yes
Are D401, C410, R416 OK?
Yes
Refer to 7-2-4 S-correction Failure.
7-10
No
No
36 ~ 41 41 ~ 50 50 ~ 61
0 V 5 V
5 V 0 V
No
No
Are Q406 and Q407 OK?
Yes
Check and replace IC202.
Replace it.
5 V
5 V
Check and replace it.
Check and replace it.
No
Replace Q406, Q407.
CHA42*7L/5**7L