Samsung PL-42Q91HDP Service Manual page 40

4-1-3 Troubleshooting
Symptom
A blank vertical cell (block)
appears on the screen.
A green screen appears when
the TV is turned on.
The OSD box appears but there
is no text.
A blank upper (or lower) block
appears on the screen.
Samsung Electronics
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Troubleshooting
Causes and Countermeasures
Address buffer defect
- Replace the corresponding upper/lower
buffers (E, F)
COF defect (burnt)
- Replace the module
The Scale is not reseting
- Replace the Main board
Incorrect program version
- Check the version of each program
- Replace the Main board
Upper/Lower Y Buffer defect
- Replace the corresponding upper/lower
buffers (E, F)
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