Technical description and composition of the LG 49SJ810V TV, panel type and modules used. The composition of the modules.LG LED
Model: 49SJ810V ZA
Chassis / Version: LJ7 Chassis
Panel: LC490EGH (FK) (M1)
LED backlight: 6922L-0221A EDGE LED
LED driver (backlight): integrated into PSU
MOSFET LED driver: 19NF20
Power Supply (PSU): EAX67187601 (1.7) EAY64528901 LGP4955-17UL6
PWM Power: PFC, PWM IDP2303
MOSFET Power: TO-252
MainBoard: EAX67107604 (1.0)
IC MainBoard: LG1313 1733 B1, BR24G256
Tuner: TDJN-G501D EBL61841001
Specifications 49SJ810V
LG 49SJ810V
General recommendations for TV LCD LED repair
Possible manifestations of defects
- The LG 49SJ810V TV does not turn on, does not respond to the remote control and control panel buttons, does not light or blink indicators.
Often in such cases the power supply module EAX67187601 is faulty. Its output voltages should be measured, and if they are absent, check the serviceability of the power switches (TO-252) of the converters and rectifier diodes for the probability of a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in short-circuit mode, and in case of short-circuit in the elements of the primary circuit, the mains fuse usually breaks off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers PFC, PWM IDP2303, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or known to be working properly.
- There is no picture, but there is sound and all other TV functions are working. The image sometimes appears for a second immediately after switching on and disappears.
Often in such cases, there is no backlighting of the LED panel. The reason can be found in the malfunction of the LEDs, in the violation of the contact connections of the LED strips, or in the provision of their power supply (LED driver).
When diagnosing, it must be borne in mind that it is impossible to check for an open in the circuit of the LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally a current source. By opening the panel, you can check each LED separately. Typically, Chinese multimeters will lightly light one 3-volt LED if you connect the probes to it in the forward direction. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the K / Z.
- The TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the EAX67107604 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). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - LG1313 1733 B1, BR24G256. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
If the LG 49SJ810V has no picture, but there is sound, the LCD backlight LC490EGH (FK) (M1) often 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 LC490EGH LCD panel, a process that requires experience and qualifications from the technician. 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 EAX67107604 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 normal limits, it is necessary to trace the passage of LVDS signals from the MainBoard EAX67107604 with an oscilloscope, as well as synchronizing signals to the 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.
If there is no reception of TV channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the TDJN-G501D EBL61841001 tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
Attention! Users and owners of 49SJ810V TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> CHASSIS : UD71H for models 49SJ810V 49SJ810V-ZA, 55SJ810V 55SJ810V-ZA
Additional MainBoard RepairThe appearance of the MainBoard EAX67107604 is shown in the figure below:
EAX67107604
External view of the power supply
Main features of the LG 49SJ810V device:
Installed matrix (LED panel) LC490EGH (FK) (M1).
A converter combined with a power supply is used to power the backlight LEDs. The keys of the 19NF20 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the LG 49SJ810V TV is carried out by the EAX67187601 power module, or its analogs using PFC, PWM IDP2303 microcircuits and TO-252 type power switches.
MainBoard - the main board (motherboard) is an EAX67107604 module, using LG1313 1733 B1, BR24G256 and others.
Tuner TDJN-G501D EBL61841001 provides reception of television programs and tuning to channels.
There are files to download for the 49SJ810V model from the manufacturer:Files with updates and instructions:
File Description File Name Type Date Size
SW File (Version 05.80.35). Update instructions TV_Software_Update_Guide_v3.pdf PDF 11.07.2019 2014K
SW File (Version 05.80.35). Firmware (USB) Software_File (Version_05.80.35) .zip ZIP 11.07.2019 838982K
Compatible with 43UJ740V-ZA, 43UJ7507-ZB, 43UJ750V-ZB, 49SJ800V-ZB, 49SJ8109-ZA, 49SJ810V-ZA, 49SK7900PLA, 49UJ740V-ZA, 49UJ7507-ZB, 49UJ7509-ZB, 49UJ750V-ZB, 55SJ800V-ZB, 55SJ8109-ZA, 55SJ810V-ZA, 55SJ8509-ZA, 55SJ850V-ZA, 55SJ930V-ZA, 55SJ950V-ZA, 55SK7900PLA, 55UJ740V-ZA, 55UJ7507-ZB, 55UJ7509-ZB, 55UJ750V-ZB, 60SJ810V-ZA, 60SJ8509-ZA, 60SJ850V-ZA, 60UJ7507-ZB, 60UJ750V-ZB, 65SJ800V-ZB, 65SJ8109-ZA, 65SJ810V-ZA, 65SJ8509-ZA, 65SJ850V-ZA, 65SJ930V-ZA, 65SJ9509-ZA, 65SJ950V-ZA, 65SK7900PLA, 65UJ7507-ZB, 65UJ7509-ZB, 65UJ750V-ZB, 75SJ955V-ZA, 86SJ957V-ZA
User Manuals and Instructions:
File type File name Language Date Size
User manual MFL69365752_01.pdf English, Estonian, Latvian, Lettish, Lithuanian 05/06/2017 52023K
Quick Start Guide w3.5_mr_e04.zip English, Estonian, Latvian, Lettish, Lithuanian, Russian 10/31/2019 56,571K
LG 49SJ810V TV with LCD display LC490EGH (FK) (M1), diagonal size 49.5 "(126 cm) 16: 9 format. This model uses a panel with edge LED backlighting - Edge LED.The files can be downloaded from the manufacturer's website for the 49SJ810V model.
The LC490EGH sensor and MainBoard EAX67107604 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 49SJ810V 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 x3, Ethernet (RJ-45), Bluetooth, Wi-Fi 802.11n, 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 EAX67187601 power supply.
Dimensions: With stand 1100x699x248 mm, Without stand 1100x641x62 mm.
Attention! The LC490EGH panel of the LG 49SJ810V 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.
