Technical description and composition of the LG 43UH6507 TV, panel type and modules used. The composition of the modules.LG LED
Model: 43UH6507 -ZB
Chassis / Version: UD63J
Panel: LC430DGG (FJ) (M1)
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAX66793301 (1.6) EAY64269501 LGP43DIMU-16CH2
MainBoard: EAX66804605 (1.1), EBT64102509
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: TDJN-G301D
Specifications 43UH6507
LG 43UH6507
General recommendations for TV LCD LED repair
Possible manifestations of defects
- LG 43UH6507 TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
In some of these cases, the main switching power supply, the EAX66793301 module, is faulty. It is necessary to measure its output supply voltages, and if they are absent, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work in an emergency in the short-circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM), if they do not have visible damage to the case and an outright short circuit between the terminals, are usually checked by replacement.
- There is no picture, but there is sound and all other functions work. Sometimes when you turn it on, the image appears and disappears for a second.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlight. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
To check the health of the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED separately with a simple Chinese multimeter (powered by 9 volts) in the P-N transition test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black one to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. The serviceability of the PN junction of the Zener diode indirectly indicates the serviceability of the LED-a
If LG 43UH6507 has no picture, but there is sound, often the LCD backlight LC430DGG (FJ) (M1) 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 LC430DGG 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 EAX66804605 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 EAX66804605 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.
- 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 EAX66804605 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).
A malfunction of the TDJN-G301D tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be monitored with an oscilloscope.
Once again, we remind TV users: you should not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> LG 43UH6507 Chassis UD63J for models 43UH65**, 43UH65**-ZB/ZE, 43UH6507, 43UH650V, 43UH651V, 43UH656V
The appearance of the MainBoard EAX66804605 is shown in the figure below:EAX66804605
Main features of LG 43UH6507 device:
Installed matrix (LED panel) LC430DGG (FJ) (M1).
A converter combined with a power supply is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the LG 43UH6507 TV is carried out by the EAX66793301 power module, or its analogs.
MainBoard - the main board (motherboard) is an EAX66804605 module, using CPU, eMMC, DRAM, AUDIO, DC / DC and others.
Tuner TDJN-G301D provides reception of television programs and tuning to channels.
LG 43UH6507 TV with LCD LC430DGG (FJ) (M1), 43 "(109 cm) diagonal, 16: 9 format. The LCD panel implements the principle of direct backlight display with rear-mounted LEDs - Direct LED.
The LC430DGG sensor and MainBoard EAX66804605 software are capable of realizing the highest UHD image 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.
TV model 43UH6507 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), MKV, JPEG.
Speaker 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, HDMI x3, USB x2, Ethernet (RJ-45), Bluetooth, Wi-Fi, 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 EAX66793301 power supply.
Dimensions: With stand 733x483x170 mm, Without stand 973x572x77 mm.
TV weight: 9.7 kg.
Attention! The LC430DGG panel of the LG 43UH6507 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.