Technical description and composition of the LG 43LH541V TV, type of panel and applicable modules. The composition of the modules.LG LED
Model: 43LH541V 43LH541V-ZD
Chassis / Version: LD68T-LB67T
Panel: HC430EUN-SLES8-213X (5112)
LED backlight: MAK63207801
T-CON: 6870C-0532A
LED driver (backlight): integrated into PSU; 117V, 250mA
Power Supply (PSU): EAX66822701 (1.5) EAY64308601 LGP43BI-16CH1
MainBoard: EAX66748005 (1.0)
IC MainBoard: LGE6351, 24C256 (4G25), MX25L8035E, NAND: H27U1G8F2CTR
Tuner: TDJA-G301D
Control: Remote: AKB74475490
Specifications 43LH541V
LG 43LH541V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 43LH541V does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
With such manifestations, a malfunction is most likely to be detected in the EAX66822701 power supply module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in 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 at the source of the key.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the health in 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 individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black 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. A zener diode PN junction indirectly indicates a LED-a
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX66748005 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements LGE6351, 24C256 (4G25), MX25L8035E, NAND: H27U1G8F2CTR requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If the TV works normally from external devices, but does not tune into television channels, the TDJA-G301D may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
If LG 43LH541V has no picture, but there is sound, often the display backlight HC430EUN-SLES8-213X (5112) 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 HC430EUN-SLES8-213X 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 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 often the main board MainBoard EAX66748005 turns out to be faulty, a software failure is also possible.
Then, first of all, it is necessary to check the panel 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 the passage of LVDS signals from the MainBoard EAX66748005 with an oscilloscope, as well as synchronization 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.
Attention to users! Self-repair of the LG 43LH541V TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard EAX66748005 is shown in the figure below:EAX66748005
The appearance of the power supply
Main features of the device LG 43LH541V:
Installed matrix (LED panel) HC430EUN-SLES8-213X (5112).
The matrix control uses the Timing Controller (T-CON) 6870C-0532A.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the LG 43LH541V TV is carried out by the EAX66822701 power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX66748005 module, using chips LGE6351, 24C256 (4G25), MX25L8035E, NAND: H27U1G8F2CTR and others.
The TDJA-G301D tuner provides TV reception and channel tuning.
LG 43LH541V TV with HC430EUN-SLES8 LCD, 43 "(109 cm) 16: 9 format diagonal. This model uses a panel with edge LED backlighting - Edge LED.
The HC430EUN-SLES8 sensor and MainBoard EAX66748005 software provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution at 1080p (Full HD). The input analog video signal is decoded in PAL, SECAM, NTSC systems. The graphic processing of the digital signal is carried out in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
Speaker power 10 W (2x5 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), component, HDMI x2, USB. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is provided. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
The digital tuner can receive TV channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
The TV uses an EAX66822701 power supply.
Dimensions: With stand 1106x701x325 mm, Without stand 1106x647x37 mm.
Attention! Panel HC430EUN-SLES8 LED TV LG 43LH541V 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.