VIORE PDP4210EA Service Manual page 103

4. Trouble shooting.
Vertical defect (bar)
Check each section with following method if there is problem, replace or repair that part.
If not go to the next section.
1. Connector
Check COF connector.
If not connected well,it will Make a bar defect .
2. Checking COF
Confirm whether COF was torn. And then check input of COF resistor and IC.
Tearing
Check here
Check here
COF 6 is torn partly
30 /40
Bar
Off