Troubleshooting; Checkpoints By Error Mode; First Checklist For Troubleshooting - Samsung PS43D490A1XZN Service Manual

4. Troubleshooting

4.1. Checkpoints by Error Mode

4.1.1. First Checklist for Troubleshooting

1) Check the various cable connections first.
• Check to see if there is a burnt or damaged cable.
• Check to see if there is a disconnected or loose cable connection.
• Check to see if the cables are connected according to the connection diagram.
2) Check the power input to the Main Board.
3) How to distinguish if the problem is caused by Main board or Logic Board.
• No Video : If the problem is No Video but Logic Board is on and Indication LED is blinking repeatedly and
faster than normal booting, replace the T-Con board.
• Distorted Picture : Check the inner patterns.
Inner pattern
OK
NG
• How to check inner pattern?
a. Factory mode (mute → 1 → 8 → 2 → Power on when TV is in 'stand - by mode' )
b. Move to SVC menu.
c. Move to Test Pattern.
d. Check inner patterns.
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Picture
NG
NG Main or LVDS cable or Logic Board or Panel.
4. Troubleshooting
Problem
Main board
4-1