1 III LED TV LED TV 2 LED Repair Tips III.1 LED Basic Structure · · · · · · · · · · · · · · · · · · 69 ▣ Main Functions by Component · · · · · · · · ·...
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III LED TV
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LED TV LED Repair Tips III.1
III.2
III.3
III.4
LED Basic Structure · · · · · · · · · · · · · · · · · ·
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▣ Main Functions by Component · · · · · · · · · · ·
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No Power Troubleshooting · · · · · · · · · · · · · · ·
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▣ Main Board Test · · · · · · · · · · · · · · · · · ·
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▣ SMPS Board Test · · · · · · · · · · · · · · · · · ·
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▣ Jog Function Board Test · · · · · · · · · · · · · ·
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Image Distortion Troubleshooting · · · · · · · · · · ·
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▣ LVDS Test · · · · · · · · · · · · · · · · · · · · · ·
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▣ Picture Test · · · · · · · · · · · · · · · · · · · · ·
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▣ T-Con Board Test · · · · · · · · · · · · · · · · · ·
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▣ HDMI Ports Test · · · · · · · · · · · · · · · · · ·
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▣ EDID Re-Write · · · · · · · · · · · · · · · · · · · ·
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Audio Distortion Troubleshooting · · · · · · · · · · ·
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▣ Sound Test · · · · · · · · · · · · · · · · · · · · ·
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▣ Camera and Microphone Test · · · · · · · · · · ·
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LED F Series
o
LED Basic Structure
Camera & Microphone module (Available on F7500 and F8000)
Panel Label
Lead Conn. SMPS
Main BD LVDS
Function BD L E D
T-Con BD Speaker
Speaker
WIFI Module
P-Jog button
IR sensor
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LED F Series
Main Functions by component SMPS Board. This board provides the voltages for the backlight and the Main board. Main Board. The Main Board is where all the inputs for all the sources are located such as the HDMI, Component, and USB ports. The Main Board also controls the WIFI, Bluetooth, 3D, and Smart Hub functions, special applications, and all other functions. The Main board processes information through the microprocessor. For video information it encodes the data and sends it through the LVDS cable to the T-Con Board. The Main Board also processes audio information and sends it to the speakers. T-Con Board. The T-Con Board receives signal from the Main board via the LVDS cable and processes it in order to send related drive signals to the panel. The drive signals control the rows and columns of the LED panel and the operation of the sub pixels.
The T-Con board also includes the Frame Rate Control or FRC circuit for 120 Hz and 240 Hz models. The FRC creates extra frames by reading the original frames of video information, and then calculating and supplying additional data to the panel.
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LED Troubleshooting
III.1 No Power Troubleshooting
L E D
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LED Troubleshooting
Main Board Test
Main Board test 1.- Remove the rear cover.
2.- Connect the power cord.
3.- Check if the Stand By LED is on. If it’s not on, refer to the Function Board test (Page 75). If the Stand By LED is on, turn on the TV.
4.- If the TV does not power on or the LED backlights do not illuminate, disconnect the power cord, and then the cable between the Main Board and the SMPS.
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LED Troubleshooting
Main Board Test
5.- Reconnect the power cord. If the LED backlights illuminate, change the Main Board.
6.- If the LED backlights do not illuminate, check the SMPS as shown in the SMPS troubleshooting section. (Page 74 ).
Note: For F4000 up to F6100 models, it’s important to first disconnect the Function Board connector (Figure 1) before taking off the rear cover. Otherwise you can damage the connector, cable, or Main Board terminal.
Figure 1
Figure 2
Since the function cable is attached to the rear cover, you must disconnect the Jog controller assembly and then reconnect it to the Main Board for testing (Figure 2).
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L E D
LED Troubleshooting
SMPS Test
Power Board (SMPS) test 1.- Verify the fuse on the SMPS for continuity to make sure it’s not open.
* If the fuse is open, replace the SMPS. If the fuse is not open, continue troubleshooting.
2.- After disconnecting the cable between the Main Board and SMPS check the SMPS voltages. For this, first locate pins A5V or B5V and B13V using the pin guide on the board.
3.- Measure the voltages with a multi-meter. For pins A5V or B5V, 5.3 volts should be present. For B13V, the voltage measured should be 12.8 V. If these voltages are not present, replace the SMPS.
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LED Troubleshooting
Jog Function Board Test
Function Board test 1.- Check the voltage for the IR pin. It should measure 3.3 V.
2.- Press any button on the remote control. The voltage should fluctuate to 2.5 V. This indicates the IR is working properly.
3.- Locate the Key 1 pin on the Jog 4.- Voltage on Key 1 should change Function Board. Press the center of the from 3.3 V to 0 V. switch.
5.- Locate the Key 2 pin and push the Jog control to the left. Voltage should change from 3.3 V to 1.6 V.
6.- Push the Jog control to the right. Voltage should change fro 3.3 V to 2.5 V.
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L E D
LED Troubleshooting
Jog Function Board Test
Function Board test 7.- Push the Jog control up. Voltage should change from 3.3 V to 0 V.
8.- Push the Jog control down. Voltage should change from 3.3 V. to 0.8 V.
If any of these voltages is not present, replace the Function Board.
Note: For F4000 up to F6100 models, it’s important to first disconnect the Function Board connector (Figure 1) before taking off the rear cover. Otherwise, you can damage the connector, cable, or Main Board terminal.
Figure 1
Figure 2
Since the function cable is attached to the rear cover, it is necessary to disconnect the Jog controller assembly, and then reconnect it to the Main Board for testing (Figure 2).
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LED Troubleshooting
III. 3 Image Distortion Troubleshooting
L E D
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LED Troubleshooting
Image Distortion
Understanding the LED signal path is essential for troubleshooting. 2013 LED models include input ports to the Main board through which signals are decoded and then processed by the new FOX CPU (F7500 and F8000), X12 CPU (F6300 up to F7100), or X13 CPU (F4000 up to F5050). The Main Board also generates an initial power on Boot logo that appears for a short time but can be disable in the TV’s main menu. The On Screen Display (OSD) and the Customer picture test are available in standard menus. Also, the Service Menu includes pattern select test patterns which you can use to test the Main Board. For 120 Hz or 240 Hz models, the video data signal passes through the LVDS cable to the T-Con board, here the FRC IC (Frame Rate Control) and the T-Con processor has been combined. There are three sets of test patterns for testing the T-Con board. Test patterns from the FRC section are labeled “FRC Pres Test” and “FRC Post Test”. There is also the “SOC T-Con Test” which is generated from the TCon processor on the board. From there, the final video signal passes to the panel. Note: On the X13 platform (F4000 up to F5050), there is no FRC circuit. Therefore, there is no FRC related test patterns available. 12
LED Troubleshooting LVDS Test
LVDS Connection. 1.- Confirm that the LVDS cable connectors are assembled properly.
Correct LVDS Cable assembly
Wrong LVDS Cable insertion
LVDS Cable damaged
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L E D
LED Troubleshooting
Picture Test
Picture Test. 1.- Press the Menu button on the remote control. Then, select the Support option.
2.- Select the Self Diagnosis option.
3.- Go to Picture Test.
4.- TV will display a test picture for Main Board diagnosis (Pattern 1). Check the picture for any defects.
5.- If defects are found, select Yes.
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LED Troubleshooting
Picture Test
6.- The TV will display a test pattern for the T-Con Board diagnosis from the FRC section (Pattern 2).
8.- Another test pattern, now from the T- Con processor will display (Pattern 3).
7.- Again, if defects are found, select Yes.
9.- Again, if defects are found, select Yes. The result window will appear.
Diagnose the defect according to the results of the Test Picture: Main Board T-Con. Pre T-Con. Post [Pattern1] [Pattern2] [Pattern3]
Problem
Pass
Pass
Pass
Signal Source / Cable
Fail
Pass
Pass
Main Board
Fail
Fail
Pass
T-Con. Board / LVDS Cable
Fail
Fail
Fail
Panel
Note: On the X13 platform (F4000 up to F5050), Pattern 2 and 3 are not available. 15
L E D
LED Troubleshooting T-Con Board Test
T-Con Test. 1.- Check the LVDS connector and panel connectors for improper connections.
2.- Power on the TV and check for the three T-Con LEDs.
3.- Check for the LED all the way to the right (See the arrow in the picture below). it should measure 17 V. If it is off, the No Picture symptom will be present.
4.- The middle LED should measure 3.1V. If this LED is off, the Video Noise symptom will be present.
5. The left LED should measure 12 V. If it is off, the TV will present the No Picture symptom.
6. If one or more LEDs are off, replace T-Con Board. 16
LED Troubleshooting HDMI Ports Test
HDMI Test. 1.- Check all HDMI ports for physical damage.
2.- If none of the ports look damaged, but the TV still will not display a picture, suspect an IC604 defect and replace Main Board. 3.- If one of the HDMI ports works, but the others do not, this could be caused by overflow voltage from an external device. 4.- Plug an HDMI cable into an HDMI port and power on the TV. Select the source according to the HDMI port you are using.
5. Check the voltage for each port on the appropriate pin. Each port should measure 5 V. HDMI Port HDMI 1 HDMI 2 HDMI 3 HDMI 4
Pin Pin 3 Pin6 Pin 8 Pin 11
6. If the voltages are not present, check if the HDMI cable is connected properly and in good condition. If the cable is working, rewrite the EDID (See Page 84.) 17
L E D
LED Troubleshooting EDID Re-Write
EDID Re-Write. 1.- Open the Factory Menu (See page 114), and then check the EDID option.
2.- If the EDID option displays“ Failure”, disconnect all external devices connected to the TV’s HDMI connections, select the Control option, and then select EDID.
3.- This option should be “Off” by default to make sure settings don’t change. To perform an EDID Re- Write, press the right arrow button on the Factory remote to change this option to “On”.
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LED Troubleshooting
EDID Re-Write
EDID Re-Write.
4.- Press the “Return” key on the Factory Remote. EDID information is displayed on screen. Select EDID WRITE HDMI.
L E D
5.- After the Re-write is finished, turn the EDID option “Off” again to prevent other modifications by accident.
6.- Exit the Factory Menu. If the HDMI ports still do not work, replace the Main Board.
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LED Troubleshooting
III. 4 Audio Distortion Troubleshooting
Audio Distortion
Check all Ext. Devices & Connections.
Sound in Self Diagnosis good?
No
Speakers Cables are ok?
No Reinsert Speaker Cable.
Yes
Yes External source problem
Are the speakers in good condition?
Yes Exchange Main Board
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No Exchange Speakers
LED Troubleshooting
Sound Test
Sound Test.
1.- Press the Menu button on the remote control. Then, select the Support option.
2.- Select the Self Diagnosis option.
L E D
3.- Go to Sound Test.
4.- Listen to the sound in detail.
5.- If defects are not found, suspect an issue with an external source. If defects are found, check the speaker connections. To test if there is a problem with the connections, try reinserting them, If the issue continues, replace the speakers. If there is no problem with the connections, replace the Main board.
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LED Troubleshooting
Camera and Microphone Test
Camera and Microphone module test (F7500 and F8000). The F7500 and F8000 series come with a camera module for Face Recognition and Motion Control. 2013 Models have a retractable camera that can be pushed into the main frame of the TV. Before troubleshooting, make sure the camera assembly is working mechanically.
1.- Press Mute + 569 + Exit on the remote control. If the camera is working properly, a window will appear and display what the camera sees.
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LED Troubleshooting
Camera and Microphone Test
2.- Tap the left and right microphones at the top or rear part of the camera module. Listen for a response to confirm the microphones are working properly.
L E D
Camera Test 2. 2.- Check for the Voice Recognition and Motion Control options.
1.- Press the Menu button on the remote. Select the Smart Features option.
If either of them is grayed out or will not open, suspect a defective camera module.
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LED Troubleshooting
Camera and Microphone Test Camera Test 3.
1.- Press the Menu button on the remote. Select the Support option.
2.- Select the Contact Samsung option.
4.- Scroll down to look for the camera version
If no version appears suspect defective camera.
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LED Troubleshooting
Camera and Microphone Test Camera Test 4. 2.- Select the ER Count option.
1.- Open Service Menu. Select SVC option.
3.- Check the Camera ER Count option.
If there is any number other than 0 displayed, this could indicate a defective camera module.
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