Category: LCD Television Repair and Service
Contents of this article
- How to Access service mode
- Troubleshooting
- No power fault finding
SAMSUNG LA40B550K1R
Factory Mode Adjustments
Entering Factory Mode
To enter ‘Service Mode’ Press the remote -control keys in this sequence :
- If you do not have Factory remote - control
INFO > MENU > MUTE > Power on
- If you have Factory remote - control
PICTURE ON > DISPLAY > FACTORY
Entering Factory Mode
To enter ‘Service Mode’ Press the remote -control keys in this sequence :
- If you do not have Factory remote - control
INFO > MENU > MUTE > Power on
- If you have Factory remote - control
PICTURE ON > DISPLAY > FACTORY
- The buttons are active in the service mode.
1. Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left
Arrow Right, Menu, Enter, Number Key(0~9)
2. Function - Control Key : Power, CH +, CH -, VOL +, VOL -, Menu, TV/VIDEO(Enter)
1. Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left
Arrow Right, Menu, Enter, Number Key(0~9)
2. Function - Control Key : Power, CH +, CH -, VOL +, VOL -, Menu, TV/VIDEO(Enter)
Troubleshooting
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.
Check the power input to the Main Board.
check internal pattern FBE3 if there is some picture noise.
FBE3 : Factory mode(Info - MENU - MUTE - power on) -> Advanced Menu -> Option Block -> FBE -> Pattern Select
Press right button of Remocon. If FBE3 NG, change the main Board
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.
Check the power input to the Main Board.
check internal pattern FBE3 if there is some picture noise.
FBE3 : Factory mode(Info - MENU - MUTE - power on) -> Advanced Menu -> Option Block -> FBE -> Pattern Select
Press right button of Remocon. If FBE3 NG, change the main Board
No Power
Symptom
The LEDs on the front panel do not work when connecting the power cord.
The IP BOARD relay does not work when connecting the power cord.
The units appears to be dead.Major checkpoints
The IP 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 IP BOARD 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 IP BOARD.
Replace the Main Board.
No Video (Analog PC signal)
Symptom
The LEDs on the front panel do not work when connecting the power cord.
The IP BOARD relay does not work when connecting the power cord.
The units appears to be dead.Major checkpoints
The IP 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 IP BOARD 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 IP BOARD.
Replace the Main Board.
No Video (Analog PC signal)
Symptom
Audio is
normal but no picture is displayed on the screen.
Major checkpoints
Check the PC source
Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Major checkpoints
Check the PC source
Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
No Video (HDMI 1, 2, 3, 4 -
Digital Signal)
Symptom
Symptom
Audio is
normal but no picture is displayed on the screen.
Major checkpoints
Check the HDMI source.
Check the HDMI switch, Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
No Video (Tuner_CVBS)
Symptom
Major checkpoints
Check the HDMI source.
Check the HDMI switch, Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
No Video (Tuner_CVBS)
Symptom
Audio is
normal but no picture is displayed on the screen.
Major checkpoints
Check the Tuner CVBS source.
Check the Tuner, Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Major checkpoints
Check the Tuner CVBS source.
Check the Tuner, Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
No Video (Video CVBS 1, 2)
Symptom
Symptom
Audio is
normal but no picture is displayed on the screen.
Major checkpoints
Check the Video CVBS source
Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Major checkpoints
Check the Video CVBS source
Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
No Video (Component 1, 2)
Symptom
Symptom
Audio is
normal but no picture is displayed on the screen.
Major checkpoints
Check the Component source
Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Major checkpoints
Check the Component source
Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
No Sound
Symptom
Symptom
Video is
normal but there is no sound..
Major checkpoints
When the speaker connectors are disconnected or damaged.
When the sound processing part of the Main Board is not functioning. Speaker defect..
Major checkpoints
When the speaker connectors are disconnected or damaged.
When the sound processing part of the Main Board is not functioning. Speaker defect..
General Alignment Instuction
1. Usually, a color LCD-TV needs only slight touch-up adjustment upon installation.
2. Check the basic characteristics such as height, horizontal and vertical sync.
3. Use the specified test equipment or its equivalent.
4. Correct impedance matching is essential.
5. Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generator to distort test result.
6. Connect the TV only to an AC power source with voltage and frequency as specified on the backcover nameplate.
7. Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts.
8. To protect against shock hazard, use an isolation transformer.
1. Usually, a color LCD-TV needs only slight touch-up adjustment upon installation.
2. Check the basic characteristics such as height, horizontal and vertical sync.
3. Use the specified test equipment or its equivalent.
4. Correct impedance matching is essential.
5. Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generator to distort test result.
6. Connect the TV only to an AC power source with voltage and frequency as specified on the backcover nameplate.
7. Do not attempt to connect or disconnect any wire while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts.
8. To protect against shock hazard, use an isolation transformer.
Panel Check
You have to check Panel Maker Because of different adjustments as follows. First of all, Check the label rating!
1) Label Rating File
- LCD PANEL MARK
A:ACER(AUO) S : SEC C : CMO
* If not printed you could consider S(sec) panel mark.
You have to check Panel Maker Because of different adjustments as follows. First of all, Check the label rating!
1) Label Rating File
- LCD PANEL MARK
A:ACER(AUO) S : SEC C : CMO
* If not printed you could consider S(sec) panel mark.
Method of Color Calibration
(AV)
1) Apply the PAL Lattice (NO. 2) pattern signal to the AV IN 1 port
2) Press the Source key to switch to “AV1” mode
3) Enter Service mode
4) Select the “ADC” menu
5) Select the “AV Calibration” menu.
6) In “AV Calibration Off” status, press the “ > ” key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “AV Calibration” status from Failure to Success.
Method of Color Calibration (Component)
1) Apply the 720p Lattice (N0. 6) pattern signal to the Component IN 1 port
2) Press the Source key to switch to “Component1” mode
3) Enter Service mode
4) Select the “ADC” menu
5) Select the “Comp Calibration” menu.
6) In “Comp Calibration Off” status, press the “ > ” key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “Comp Calibration” status from Failure to Success.
Method of Color Calibration (PC)
1) Apply the VESA XGA Lattice (N0. 21) pattern signal to the PC IN port
2) Press the Source key to switch to “PC” mode
3) Enter Service mode
4) Select the “ADC” menu
5) Select the “PC Calibration” menu.
6) In “PC Calibration Off” status, press the “ > ” key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “PC Calibration” status from Failure to Success.
Method of Color Calibration (HDMI)
1) Apply the 720p Lattice (N0. 6) pattern signal to the HDMI1/DVI IN port
2) Press the Source key to switch to “HDMI1” mode
3) Enter Service mode
4) Select the “ADC” menu
5) Select the “HDMI Calibration” menu.
6) In “HDMI Calibration Off” status, press the “ > ” key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “HDMI Calibration” status from Failure to Success.
1) Apply the PAL Lattice (NO. 2) pattern signal to the AV IN 1 port
2) Press the Source key to switch to “AV1” mode
3) Enter Service mode
4) Select the “ADC” menu
5) Select the “AV Calibration” menu.
6) In “AV Calibration Off” status, press the “ > ” key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “AV Calibration” status from Failure to Success.
Method of Color Calibration (Component)
1) Apply the 720p Lattice (N0. 6) pattern signal to the Component IN 1 port
2) Press the Source key to switch to “Component1” mode
3) Enter Service mode
4) Select the “ADC” menu
5) Select the “Comp Calibration” menu.
6) In “Comp Calibration Off” status, press the “ > ” key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “Comp Calibration” status from Failure to Success.
Method of Color Calibration (PC)
1) Apply the VESA XGA Lattice (N0. 21) pattern signal to the PC IN port
2) Press the Source key to switch to “PC” mode
3) Enter Service mode
4) Select the “ADC” menu
5) Select the “PC Calibration” menu.
6) In “PC Calibration Off” status, press the “ > ” key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “PC Calibration” status from Failure to Success.
Method of Color Calibration (HDMI)
1) Apply the 720p Lattice (N0. 6) pattern signal to the HDMI1/DVI IN port
2) Press the Source key to switch to “HDMI1” mode
3) Enter Service mode
4) Select the “ADC” menu
5) Select the “HDMI Calibration” menu.
6) In “HDMI Calibration Off” status, press the “ > ” key to perform Calibration.
7) When Calibration is complete, it returns to the high-level menu.
8) You can see the change of the “HDMI Calibration” status from Failure to Success.
