Troubleshooting.pdf

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Troubleshooting
4. Troubleshooting
4-1 Troubleshooting
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. Check the voltage in and out between the SMPS ↔ Main Board, between the SMPS ↔ X, Y Main Board, and between the
Logic Boards.
Samsung Electronics
4-1
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Troubleshooting
4-1-2 Checkpoints by Error Mode
■ No Power
- The LEDs on the front panel do not work when connecting the power cord.
- The SMPS relay does not work when connecting the power cord.
- The units appears to be dead.
Symptom
The SMPS relay or the LEDs on the front panel does not work when connecting the power cord if the cables
are improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:
- Check the internal cable connection status inside the unit.
- Check the fuses of each part.
- Check the output voltage of SMPS.
- Replace the Main Board.
Major Checklist
Troubleshooting
Procedures
No
①
Is the AC IN socket connector and
the SMPS CN800 connected?
Insert the AC in connector and the
SMPS CN800 connector
Yes
Yes
①
Is the Fuse (F801S) of the SMPS
Power Input Part blown?
Replace Fuse (F801S)
No
SMPS CN801
Pin 3 : STB 5V
Pin 2 PS-ON : Check to see if it is 0V
No
②
Replace the SMPS
Yes
Replace the Main Board
4-2
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Troubleshooting
■ When the unit is repeatedly turned on and off
Symptom
- The SMPS relay is repeatedly turned on and off.
In general, the SMPS relay repeatedly turns on and off by the protection function due to a defect on a board
connected to the SMPS.
- Disconnect all cables from the SMPS, operate the SMPS alone and check if the SMPS works properly and if
each voltage output is correct.
- If the symptom continues even when SMPS is operated alone, replace the SMPS.
- If the symptom is not observed when operating the SMPS alone, find any defective assemblies by connecting
the cables one by one.
Major Checklist
Troubleshooting
Procedures
Does the symptom continue when
connecting the power after removing
CN810 from the SMPS?
No
Replace the Y Main Board
①
Yes
②
Does the symptom continue when
connecting the power after removing
CN809 from the SMPS?
No
Replace the X Main Board
Yes
Does the symptom continue when
connecting the power after removing
CN807 from the SMPS?
No
③
Replace the Logic Board
Yes
Replace the SMPS
WHEN SEPARATING AND CONNECTING THE CABLES SUCH AS CN810, CN809, CN808, CN807 OF THE
MAIN SMPS, CN4701 OF THE X MAIN BOARD, AND CN5707 OF THE Y MAIN BOARD, A SPARK MAY BE
GENERATED BY THE ELECTRIC CHARGE OF THE HIGH CAPACITY CAPACITOR. THEREFORE, WAIT
SOME TIME AFTER DISCONNECTING THE POWER CORD FROM THE UNIT.
Caution
Samsung Electronics
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Troubleshooting
■ No Picture (When audio is normal)
Symptom
- Audio is normal but no picture is displayed on the screen.
- This may happen when the Main Board is functioning but the X, Y Main Board, Logic Board, or Y Buffer
Boards are not.
- The output voltage of the Main SMPS.
- This may happen when the LVDS cable connecting the Main Board and the Logic Board is disconnected.
Major Checklist
CN810
CN809
CN808
CN807
Troubleshooting
Procedures
Are the Vs and Va voltages normal after
removing all cables from the SMPS?
(CN810, CN809, CN808, CN807)
No
Replace the SMPS
Yes
No
Did problem improve?
Replace the Y Main Board
Yes
No
Did problem improve?
Replace the X Main Board
Yes
No
Did problem improve?
Replace the Logic Board
Yes
No
Did problem improve?
Replace the Y Scan Board
WHEN SEPARATING AND CONNECTING THE CABLES SUCH AS CN810, CN809, CN808, CN807 OF THE
MAIN SMPS, CN4701 OF THE X MAIN BOARD, AND CN5707 OF THE Y MAIN BOARD, A SPARK MAY BE
GENERATED BY THE ELECTRIC CHARGE OF THE HIGH CAPACITY CAPACITOR. THEREFORE, WAIT
SOME TIME AFTER DISCONNECTING THE POWER CORD FROM THE UNIT.
Caution
4-4
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Troubleshooting
■ No Sound
Symptom
- Video is normal but there is no sound.
- When the speaker connectors are disconnected or damaged.
- When the sound processing part of the Main Board is not functioning.
- Speaker defect.
Major Checklist
Troubleshooting
Procedures
Is the cable connection between the
Main Board and the speaker
properly connected?
①
No
Connect the cable properly or
replace the cable, if necessary.
Yes
②
Is the output voltage of SMPS normal?
(CN801 #13)
No
Replace the SMPS
Yes
Is the speaker output terminal
of the Main Board normal?
No
Replace the Main Board
Yes
③
Replace the Speaker
Samsung Electronics
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