Technical description and composition of the LG 49UJ675V TV, panel type and modules used. The composition of the modules.LG LED
Model: 49UJ675V
Chassis / Version: EAX67133404
Panel: LC490DGG (FK) (M4)
LED backlight: 6916L-2862A, 6916L-2863A, 49 ART3 - 2863, 3V 3W
LED driver (backlight): integrated into PSU
PWM LED driver: MAP3516
MOSFET LED driver: MDD7N25
Power Supply (PSU): EAX67128101 (2.1) EAY64491201
PWM Power: SSC3S927
MainBoard: EAX67133404 (1.0) MGJ652669
IC MainBoard: Realtek K3Lp, FT24C256A, DTA2010M
Tuner: TDJN-G501D
Specifications 49UJ675V
LG 49UJ675V
General recommendations for TV LCD LED repair
Possible manifestations of defects
- LG 49UJ675V TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
Most likely, in this case, the main switching power supply (SMPS) EAX67128101 is faulty. It is then necessary to measure its output voltages and, if they are absent, the power switches and rectifier diodes of the converters should be checked for the probability of a short circuit.
In case of any breakdowns of semiconductors in the secondary circuits, the converter can usually operate normally in an emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and, less often, the current sensor in the source of the key.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) are usually checked by replacing them with new ones, or knowingly working.
- No picture, sound, all other TV functions are working. When turned on, the image may sometimes appear for a second.
In such cases, the most likely malfunction of the LED panel backlighting elements. Often the reason is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver turns out to be faulty.
To identify an open circuit in the LED lines without disassembling the panel, a current source is required. It is impossible to open the junctions connected in series with a simple multimeter; a voltage of several tens of volts is required.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the EAX67133404 motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Often the MB (SSB) board must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - Realtek K3Lp, FT24C256A, DTA2010M and replace the failed chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Usually such defects are detected by local heating of the chip.
If the LG 49UJ675V has no picture, but there is sound, often the LC490DGG-FKM4 display backlight simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image with a successful hit of external light on the screen.
Replacing the LEDs requires disassembling the LC490DGG-FKM4 LCD panel - a process that requires experience and qualifications from the master. We do not recommend doing such work on your own to the owners of TVs and craftsmen who do not have experience in repairing LCD panels
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV you can see the light through the holes in the panel case.
In this case, the panel may also be faulty - damage to the strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But the main board MainBoard EAX67133404 (1.0) often turns out to be faulty, a software failure is also possible.
Then, first of all, it is necessary to check the panel supply voltage, the 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 the normal range, it is necessary to trace the passage of LVDS signals from MainBoard EAX67133404 (1.0) with an oscilloscope, as well as synchronizing signals to loops with drivers.
Flooded or unsuccessfully washed screens of LED TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips.
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In cases where there is no tuning for terrestrial or cable TV channels, you should make sure that the software is correct, as well as in accordance with the nominal supply voltages at the TDJN-G501D tuner outputs. It is also necessary to check with an oscilloscope the presence of pulses of data exchange between the tuner and the processor via the I2C bus.
Attention to TV owners! Attempts to repair LG 49UJ675V by yourself are not recommended by the manufacturer and can lead to serious negative consequences!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> CHASSIS : UD74P for models 49UJ67*V, 49UJ67*V-ZD/ZC, 49UJ655V, 49UJ655V-ZC, 49UJ701V, 49UJ701V-ZC, 49UJ670V, 49UJ675V
Additional MainBoard RepairThe appearance of the MainBoard EAX67133404 is shown in the figure below:
EAX67133404
External view of the power supply
Main features of the LG 49UJ675V device:
Installed matrix (LED-panel) LC490DGG (FK) (M4).
A converter combined with a power supply is used to power the backlight LEDs, it is controlled by the MAP3516 PWM controller. The keys of the MDD7N25 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the LG 49UJ675V TV is carried out by the EAX67128101 power supply module, or its analogues using SSC3S927 microcircuits.
MainBoard - the main board (motherboard) is an EAX67133404 module, using Realtek K3Lp, FT24C256A, DTA2010M and others.
Tuner TDJN-G501D provides reception of television programs and tuning to channels.
There are files to download for model 49UJ675V from the manufacturer:Files with updates and instructions:
File Description File Name Type Date Size
SW File (Version 05.80.50). Update instructions TV_Software_Update_Guide_v3.pdf PDF 01/22/2020 2014K
SW File (Version 05.80.50). Firmware (USB) Software_File (Version_05.80.50) .zip ZIP 01/22/2020 831673K
Compatible with 43UJ620V-ZA, 43UJ6307-ZA, 43UJ6309-ZA, 43UJ630V-ZA, 43UJ631V-ZA, 43UJ634V-ZD, 43UJ635V-ZF, 43UJ639V-ZE, 43UJ6517-ZA, 43UJ6519-ZA, 43UJ651V-ZA, 43UJ655V-ZC, 43UJ670V-ZD, 43UJ675V-ZC, 43UJ701V-ZC, 49UJ620V-ZA, 49UJ6307-ZA, 49UJ6309-ZA, 49UJ630V-ZA, 49UJ631V-ZA, 49UJ634V-ZD, 49UJ635V-ZF, 49UJ639V-ZE, 49UJ6517-ZA, 49UJ6519-ZA, 49UJ651V-ZA, 49UJ655V-ZC, 49UJ670V-ZD, 49UJ675V-ZC, 49UJ701V-ZC, 55UJ620V-ZA, 55UJ6307-ZA, 55UJ6309-ZA, 55UJ630V-ZA, 55UJ634V-ZD, 55UJ635V-ZF, 55UJ6517-ZA, 55UJ6519-ZA, 55UJ651V-ZA, 55UJ655V-ZC, 55UJ670V-ZD, 55UJ675V-ZC, 55UJ701V-ZC, 55UK6100PLA, 55UK6100PLB, 60UJ6307-ZA, 60UJ6309-ZA, 60UJ630V-ZA, 60UJ634V-ZD, 60UJ6517-ZA, 60UJ6519-ZA, 60UJ651V-ZA, 65UJ620V-ZA, 65UJ6307-ZA, 65UJ6309-ZA, 65UJ630V-ZA, 65UJ634V-ZD, 65UJ6517-ZA, 65UJ6519-ZA, 65UJ651V-ZA, 65UJ655V-ZC, 65UJ670V-ZD, 65UJ675V-ZC, 65UJ701V-ZC, 65UK6100PLA, 65UK6100PLB, 70UJ675V-ZA, 75UJ651V-ZB, 75UJ675V-ZA.
User Manuals and Instructions:
File type File name Language Date Size
User manual 49UJ675V_ENG.pdf Russian 11/06/2017 7613K
Quick Start Guide w3.5_mr_e05_c.zip English, Estonian, Latvian, Lettish, Lithuanian, Russian 10/31/2019
Quick setup instruction Web_OS_3.5_Smart_QSG_RUS.pdf Russian 28.12.2017 4888K
The files can be downloaded from the manufacturer's website for the 49UJ675V model.
LG 49UJ675V TV with LCD display LC490DGG-FKM4, diagonal size 48.5 "(123 cm) 16: 9 format. The LCD-panel implements the principle of direct backlight display with rear-mounted LEDs - Direct LED.
The LC490DGG-FKM4 sensor and MainBoard EAX67133404 (1.0) software are capable of realizing images in the highest UHD quality at 3840x2160 resolution in 4K UHD, HDR. Image processing is performed using modern High Dynamic Range (HDR) technology with an extended range of brightness gradations.
The 49UJ675V TV model has built-in SMART software and webOS operating system installed. The connection to the network can be carried out via Wi-Fi wireless connection. Supported media file formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
Speaker sound system power 20 W (2x10 W) is provided by two speakers. The NICAM stereo audio processing system and the Sound Surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, component, HDMI x4, USB x2, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11ac, WiDi, Miracast. A headphone jack is provided.
The digital tuner can receive TV channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
The TV uses an EAX67128101 (2.1) power supply.
Dimensions: with stand 1107x705x259 mm, without stand 1107x645x80 mm.
TV weight: with stand: 12.7 kg, without stand: 11.3 kg.
Attention! The LC490DGG-FKM4 panel of the LG 49UJ675V LED TV is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.