Technical description and composition of LG 49LJ610V TV, type of panel and modules used. Module composition.
Composition
Specifications
LG 49LJ610V
Smart TV 49LJ610V | Year of manufacture: 2017
Screen diagonal: 49" (124 cm)
Aspect ratio: 16:9
Resolution: 1920x1080
Refresh rate: 50Hz
LCD panel type: LC490DUE-FKM3
LED backlight: Yes, Direct LED
Smart: Yes. Wi-Fi support: yes
Operating system: webOS
Support HD: 1080p Full HD
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C, DVB-S2
Teletext: There is
Multimedia: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG
Sound stereo: there is
Sound power: 20W (2x1W)
Acoustics: two speakers
Interface: AV, Component, HDMI x3, USB x2, Ethernet (RJ-45), Wi-Fi 802.11ac, WiDi, Miracast
Dimensions: With stand 1107x701x235mm
Without stand 1107x645x80mm
LG LED
Model: 49LJ610V
Chassis/Version: LD75M
Panel: LC490DUE (FK)(M3)
LED driver (backlight): integrated into PSU
PWM LED driver: LC5910 SO-8 Step-Down
MOSFET LED driver: KF9N25
Power Supply (PSU): EAX67108001 (1.5) LGP49D-17F1
PWM Power: SSC3S927
MOSFET Power: 60S650CE, 60R580Q
MainBoard: EAX67129603 (1.0)
IC MainBoard: SEC 725 8031 KLW4G1FEPD, FT24C256A, K4B4G164GE x2, R5F100GEAFB, DTA2010M
TDJA-G501D
General recommendations for LCD LED TV repair
Possible trouble spots
- LG 49LJ610V TV does not turn on and shows no signs of working at all. No reaction to remote control and control buttons from the front panel.
Usually with such manifestations, the defect is caused by faulty elements in the main power module EAX67108001. Then you should measure its output voltages, and in case of their full or partial absence you should check the serviceability of the power switches (60S650CE, 60R580Q) and the inverter rectifier diodes for possible short circuit.
If there is a breakdown in the secondary circuits, the inverter may be short-circuited, and if there is a short in the primary circuit elements, the mains fuse usually blows.
Breakdown of the Mos-Fet switches used in switching supplies is often caused by faults in other elements, such as the PWM power supply circuit, the frequency-retaining or damping circuits, and the Negative Feedback Stabilization circuitry. PWM chips SSC3S927 are usually checked by replacing them with new ones or with ones known to be in good working order.
- No picture, sound is present, remote responds, channels are switched. In some cases the picture appears when you switch the device on and immediately disappears.
As a rule, in this case the backlight of the LED panel is defective. The reason for this may be a break in the circuit of the LEDs, or a problem in stabilizing their power supply.
Without a special current source it is impossible to check the line of LEDs in series, and it is not safe for them to use any voltage sources over 12v for this purpose. The only thing you have to do is to open the panel and check each LED separately. Usually Chinese multimeters with 9V power supply will light up one 3 volt LED a bit if you connect the probes to it in forward direction, red probe to anode, black probe to cathode. For twin 6-volt LEDs the PN junction of its faulty regulator can be a good indicator. If the LED is faulty, it will either be open or shorted.
If the LG 49LJ610V has no picture, but there is sound, often the display backlight LC490DUE (FK)(M3) simply does not work. Moreover, in LED TVs usually fail LEDs inside the panel, less often the LED-driver.
In such cases you can see faintly visible image when external light hits the screen.
To replace the LEDs requires disassembly of the LCD-panel LC490DUE - the process requiring a master of experience and expertise. We do not recommend to perform such work by yourself to owners of TV sets and masters who have no experience in LCD-panel repair.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
If there is no image, but backlighting works - the screen becomes slightly lighter when the TV is turned on, and in the open TV you can see the light through the holes in the body of the panel.
In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the MainBoard EAX67129603 is defective, and software failure is also possible.
Then first it is necessary to check the panel power supply voltage, fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within normal limits, it is necessary to trace LVDS signals from MainBoard EAX67129603, as well as synchronizing signals to driver stubs with oscilloscope.
Filled or unsuccessfully washed LED TV screens can be restored in about half of the cases, usually if there is no significant damage to the panel's stubs and slats.
- The TV set does not enter the operating mode, the remote control is unresponsive. Front panel LED is either constantly on or is blinking.
Repair or diagnostic of the motherboard EAX67129603 should begin with checking the stabilizers and power converters necessary to power the chips and matrix. If necessary, software (software) should be updated or replaced. Often the MB board (SSB) has to be replaced if it has complex faults, which are hard to detect. If you try to repair it, you should check its elements - SEC 725 8031 KLW4G1FEPD, FT24C256A, K4B4G164GE x2, R5F100GEAFB, DTA2010M and replace faulty chips with new ones. Some faults may be related to the use of BGA soldering technology in modern Main Boards. Usually such defects are detected by local heating of the chip.
Before replacing the TDJA-G501D tuner if there is no tuning to the channels you must first check the software and power supply voltages on its pins. Also make sure that the tuner and the processor can communicate via I2C bus.
Once again we remind the TV users: do not try to repair the TV without proper knowledge, experience and necessary qualification! Trust the repair to professionals with sufficient experience in the field of electronic equipment repair.
After repair of backlight EAX67108001, LC5910. Information from the master.
Decreased backlight current from 640 mA to 370 mA - Increased R801 resistor rating from 0.91 Ohm to 1.2 Ohm on EAX67108001 (1.5) LGP49D-17F1 board.
More on MainBoard Repair
Ways to limit the current in LED backlight drivers:
There
is a lot of information on the Internet about ways to limit the current
in the LED backlighting for different TVs and LED drivers. A lot of it
is written plausibly but sometimes it is written by people far from
electronics in order to publish any popular content on hot topics to
boost web-sites ratings.
It's impossible to talk about each case
separately within one article, because even similar models may have
different panels and different boards with their own driver variants.
But there are basic principles that are clear to craftsmen with even minimal knowledge and skill.
Other popular, complex and controversial current limit cases will be published as information becomes available.
There are three basic ways to reduce the backlight current.
1. By increasing the resistance of the LED current sensor - a low-resistance measuring resistor in the cathode (LED-) circuit.
2. Increasing the ratings of the resistors on the ISET (current setting) input of the LED driver chip.
3. changing the resistor ratings in the divider on the ADIM (Dimming) control input.
The fundamental difference between input ISET and ADIM is that ISET - input inverted, as FB, and ADIM - direct.
The MainBoard EAX67129603 is shown in the figure below WITH VOLTAGE MEASURE TEST POINTS:
EAX67129603
MainBoard Appearance
The main features of the LG 49LJ610V:
The matrix (LED panel) LC490DUE (FK)(M3) is installed.
For the power supply of backlight LED used converter, combined with the power supply, controlled by LC5910 PWM controller SO-8 Step-Down. As the power elements of LED-driver KF9N25 type switches are used.
Required supply voltages for all LG 49LJ610V TV nodes are generated by the EAX67108001 power supply module, or its analogues using SSC3S927 chips and power switches of 60S650CE, 60R580Q type.
MainBoard - the main board (motherboard) represents EAX67129603 module, using SEC 725 8031 KLW4G1FEPD, FT24C256A, K4B4G164GE x2, R5F100GEAFB, DTA2010M and other chips.
The TDJA-G501D tuner provides TV program reception and channel tuning.
Instructions and updates
There are downloadable files for the 49LJ610V from the manufacturer:
Update and instruction files:
File Description File Name Type Date Size
SW File (Version 05.80.40) . TV_Software_Update_Guide_v3.pdf PDF 26.08.2020 2014K update instructions
SW File (Version 05.80.40) . Firmware (USB) Software_File(Version_05.80.40).zip zip 26.08.2020 805359K
Compatible with 32LJ590U-ZA, 32LJ594U-ZA, 32LJ610V-ZD, 32LJ622V-ZB, 43LJ594V-ZA, 43LJ595V-ZD, 43LJ610V-ZA, 43LJ614V-ZA, 43LJ622V-ZC, 43LJ624V-ZC, 49LJ540V-ZA, 49LJ594V-ZA, 49LJ595V-ZD, 49LJ610V-ZA, 49LJ614V-ZA, 49LJ622V-ZC, 49LJ624V-ZC, 55LJ540V-ZA, 55LJ615V-ZA, 55LJ622V-ZB, 55LJ625V-ZB.
Manuals and User Manuals:
Document Language Date Size
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 10.31.2019 55 631K
Quick Start Guide English - English,Estonian,Latvian,Lettish,Lithuanian,Russian 10.31.2019 No data
User manuals English 05.20.2017 14217K
You can download the files on the manufacturer's website ------------ > for the 49LJ610V model.
LG 49LJ610V TV with LCD LC490DUE (FK)(M3), size diagonal 49" (124 cm) in 16:9 aspect ratio. The LCD-panel implements the principle of direct display backlighting with a rear arrangement of LEDs - Direct LED.
LC490DUE matrix and MainBoard software EAX67129603 provide for viewing shows and movies in high quality HD with 1920x1080 pixels resolution in 1080p (Full HD).
Model 49LJ610V TV has built-in software (software) SMART and installed the operating system webOS. Connection to the network can be made via wireless Wi-Fi connection. Supported media formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
The speaker system sound power 20 W (2x1 W) provides two speakers. NICAM stereo sound processing system and Sound Surround surround function are used.
Communication with other devices via external interface is supported by standard inputs and outputs: antenna input (RF), AV, component, HDMI x3, USB x2, Ethernet (RJ-45), Wi-Fi 802.11ac, WiDi, Miracast. The digital tuner is capable of receiving TV channels in DVB-T, DVB-T2, DVB-C, DVB-S2 standards.
The TV uses the EAX67108001 power supply.
Dimensions: C stand 1107x701x235 mm, No stand 1107x645x80 mm.
Warning. Panel LC490DUE of LG 49LJ610V LED-TV is an expensive and unreliable element of the TV.
Do not allow any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.