Purity Failure - Samsung CHA4217L Service Manual

7-1-7 Poor Focus
Adjust Focus VR.
Improved Focus?
No
Check Focus lead from FBT to
CRT Socket.
Yes
Are the CRT Socket and
connection OK?
Yes
Check and replace CRT.

7-1-8 Purity Failure

Degaussing
Is purity OK?
No
IS degaussing circuit OK?
Yes
Check if there is strong
electric or magnetic fields near
user's circumstance?
No
Change CRT and readjust
misconvergence and color.
CHA42*7L/5**7L
Yes
Aging monitor and check focus
change for 1~2 hours.
No
Replace and connect it.
Yes
Done
No
Refer to 7-2-19 Degaussing Failure.
Yes
Recommend free electric or
magnetic field.
7 Troubleshooting
7-5