Faults And Corrective Actions - Samsung PS43D490A1XZN Service Manual

4. Troubleshooting

4.1.3. Faults and Corrective Actions

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.
Either the main or sub picture
does not appear.
A vertical green line appears
on the screen.
4-8
Related Image Causes and Countermeasures
Address buffer defect
•
Replace the corresponding upper/lower buffers.
•
(E, F or G)
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.
•
Replace the Main board.
•
• The SMPS voltage is incorrect.
• Adjust the SMPS voltage according to the voltage
printed on the module label.
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