LG LED
Model: 50LB675V
Chassis / Version: LD42B
Panel: LC500DUH (PG) (F2)
LED driver (backlight): integrated into PSU
PWM LED driver: iW7025-00
Power Supply (PSU): EAX65424001 (2.4) LGP4750-14LPB
PWM Power: MAP8800 (PFC), CP1034DG, ICE3BR4765JZ
MOSFET Power: 13N60M2
MainBoard: EAX65384004 (1.4) EBT63301001
IC MainBoard: CPU: LG1311; DRAM: H5TQ4G63AFR-PBC; EEPROM: AT24C256C, EMMC: THGBMAG6A2JBAIR
Tuner: TDJM-G101D
Specifications 50LB675V
LG 50LB675V
General recommendations for TV LCD LED repair
Possible malfunctions
- The LG 50LB675V TV does not turn on, does not respond to the remote control and control panel buttons, the indicators do not light up or flash.
Usually with similar manifestations, the defect is caused by faulty elements in the main power supply module EAX65424001. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (13N60M2) and rectifier diodes in the converters for a short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and with a short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key is often cut off.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) MAP8800 (PFC), CP1034DG, ICE3BR4765JZ, in the absence of external damage and short circuit between the terminals, are checked by replacing them with known good ones.
- No picture, sound, all other TV functions are working. When turned on, the image may sometimes appear for a second.
As a rule, in such cases there is no display backlight. The reason may be in the breakage of the backlight LEDs, in the stabilization of their power supply, or in the violation of the contact connections of the strings connectors.
When diagnosing, it must be borne in mind that it is impossible to check for an open circuit in the LED strips circuit 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 when the probes are connected 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 the LED health. In the event of a malfunction of the LED, its zener diode will either be cut off or pierced in the K / Z.
If the LG 50LB675V does not have a picture, but there is sound, often the LCD backlight LC500DUH (PG) (F2) 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 LC500DUH 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, light is visible through the holes in the panel case.
In this case, the panel may also be faulty - damage to 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 EAX65384004 turns out to be faulty, a software failure is also possible.
Then, first of all, you need 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 EAX65384004 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.
- 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 EAX65384004 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). Complicated repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: LG1311; DRAM: H5TQ4G63AFR-PBC; EEPROM: AT24C256C, EMMC: THGBMAG6A2JBAIR. BGA chip faults are usually easy to detect by warm-up.
Before replacing the TDJM-G101D tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention! Users and owners of 50LB675V TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting to repair themselves in order to avoid negative consequences that may lead to complete non-repairability of the device.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> CHASSIS : LD42B FOR MODELS: 50LB670V, 50LB671V, 50LB675V, 50LB677V.
Additional MainBoard Repair
The appearance of the MainBoard EAX65384004 is shown in the figure below:
EAX65384004
EAX65384004 can be used in TVs:
LG 32LB650V ZE (Panel LC320DUH (FG)(P2)), LG 47LB650V ZE (Panel LC470DUH (FG) (P2)), LG 42LB650V (Panel LC420DUH (FG)(P2)), LG 42LB671V ZF (Panel LC420DUH (PG) (F1)), LG 47LB671V (Panel LC470DUH (PG)(F1)), LG 42LB653V ZK (Panel LC420DUH (FG)(P1)), LG 42LB720V (Panel LC420DUH (PG)(F1)), LG 42LB658V (Panel LC420DUH (FG)(P2)), LG 47LB677V (Panel LC470DUH (FG)(F1)), LG 42LB679V (Panel LC420DUH (PG)(F1)), LG 47LB653V (Panel LC470DUH (FG)(P1)), LG 32LB653V (Panel LC320DUH( FG)(P1)), LG 42LB690V (Panel LC420DUH (PG)(F1)), LG 55LB630V (Panel LC550DUH).
External view of the power supply
Main features of the LG 50LB675V device:
Installed matrix (LED-panel) LC500DUH (PG) (F2).
A converter combined with a power supply is used to power the backlight LEDs and is controlled by the iW7025-00 PWM controller.
The formation of the necessary supply voltages for all nodes of the LG 50LB675V TV is carried out by the EAX65424001 power supply module, or its analogs using MAP8800 (PFC), CP1034DG, ICE3BR4765JZ microcircuits and 13N60M2 power switches.
MainBoard - the main board (motherboard) is an EAX65384004 module, using CPU chips: LG1311; DRAM: H5TQ4G63AFR-PBC; EEPROM: AT24C256C, EMMC: THGBMAG6A2JBAIR and others.
Tuner TDJM-G101D provides reception of television programs and tuning to channels.
Instructions and updates
There are files to download for the 49LB870V model from the manufacturer:
Files with updates and instructions:
File Description File Name Type Date Size
SW File (Version 05.05.70). Update instructions TV_Software_Update_Guide_v3.pdf PDF 18.07.2019 2014K
SW File (Version 05.05.70). Firmware (USB) Software_File (Version_05.05.70) .zip ZIP 18.07.2019 674112K
Compatible with:
32LB650V-ZE, 32LB650V-ZN, 32LB652V-ZA, 32LB653V-ZK, 32LB656V-ZN, 39LB650V-ZE, 39LB650V-ZN, 42LB630V-ZA, 42LB631V-ZL, 42LB639V-ZU, 42LB650V-ZE, 42LB650V-ZN, 42LB652V-ZA, 42LB653V-ZK, 42LB656V-ZN, 42LB658V-ZE, 42LB670V-ZA, 42LB671V-ZB, 42LB671V-ZF, 42LB673V-ZB, 42LB674V-ZB, 42LB676V-ZA, 42LB677V-ZC, 42LB678V-ZF, 42LB679V-ZF, 42LB679V-ZH, 42LB680V-ZD, 42LB689V-ZF, 42LB690V-ZC, 42LB700V-ZG, 42LB720V-ZG, 42LB730V-ZD, 42LB731V-ZE, 47LB630V-ZA, 47LB631V-ZL, 47LB650V-ZE, 47LB650V-ZN, 47LB652V-ZA, 47LB653V-ZK, 47LB656V-ZN, 47LB670V-ZA, 47LB671V-ZB, 47LB671V-ZF, 47LB673V-ZB, 47LB674V-ZB, 47LB676V-ZA, 47LB677V-ZC, 47LB678V-ZF, 47LB679V-ZF, 47LB679V-ZH, 47LB680V-ZD, 47LB690V-ZC, 47LB700V-ZG, 47LB720V-ZG, 47LB730V-ZD, 47LB731V-ZE, 49JL9000-ZA, 49LB860V-ZB, 49LB870V-ZA, 50LB650V-ZE, 50LB650V-ZN, 50LB653V-ZK, 50LB670V-ZA, 50LB671V-ZB, 50LB674V-ZB, 50LB675V-ZA, 50LB676V-ZA, 50LB677V-ZC, 55JL9000-ZA, 55LB630V-ZA, 55LB631V-ZL, 55LB650V-ZN, 55LB652V-ZA, 55LB653V-ZK, 55LB656V-ZN, 55LB670V-ZA, 55LB671V-ZB, 55LB671V-ZF, 55LB673V-ZB, 55LB674V-ZB, 55LB675V-ZA, 55LB676V-ZA, 55LB678V-ZF, 55LB679V-ZF, 55LB680V-ZD, 55LB690V-ZC, 55LB700V-ZG, 55LB720V-ZG, 55LB730V-ZD, 55LB731V-ZE, 55LB860V-ZB, 55LB870V-ZA, 60JL9000-ZA, 60LB650V-ZN, 60LB680V-ZD, 60LB720V-ZG, 60LB730V-ZE, 60LB860V-ZB, 60LB870V-ZA, 65LB680V-ZD, 65LB730V-ZE, 70LB650V-ZA.
User Manuals and Instructions:
File type File name Language Date Size
User manual MFL68027016_05_RS.pdf English 01/20/2015 82,236K
Quick Start Guide WebOS_L_EU_13.zip English, Estonian, Latvian, Lettish, Lithuanian, Russian 03/10/2015 13,751K
Quick setup instructions MBM63817892_rev02_ENG.pdf English 09/11/2015 6,311K
Files can be downloaded from the manufacturer's website for the 49LB870V model.
TV LG 50LB675V with LCD display LC500DUH (PG) (F2), diagonal size 50 "(127 cm) 16: 9 format. The LCD-panel implements the principle of direct display backlighting with rear-mounted LEDs - Direct LED.
There is support for 3D images using passive polarization technology.
The LC500DUH sensor and MainBoard EAX65384004 software provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution at 1080p (Full HD).
TV model 50LB675V has built-in SMART software and webOS operating system installed. The connection to the network can be carried out via Wi-Fi wireless connection. The input analog video signal is decoded in PAL, SECAM, NTSC systems. Graphic processing of a digital signal is performed in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
Sound system power of 24 W is provided by 3 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, audio x2, component, SCART, RGB, HDMI x3, MHL, USB x3, Ethernet (RJ-45), Wi-Fi 802.11 n, WiDi, Miracast. A headphone jack is provided. A VGA (D-Sub 15) connector is provided to connect a computer or laptop to this TV model. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080. The digital tuner is capable of receiving TV channels in the DVB-T, DVB-T2, DVB-C, DVB-S2 standards.
The TV uses an EAX65424001 power supply.
Dimensions: With stand 1116x705x247 mm, Without stand 1116x653x55 mm.
Attention! Panel LC500DUH LED-TV LG 50LB675V 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.