Technical description and composition of the LG 49UH619V TV, panel type and modules used. The composition of the modules.LG LED
Model: 49UH619V
Chassis / Version: UD65S
Panel: HC430DGN-SLNX6-211X
T-CON: 6870-0647A 6871L-4293FFAAW4G9026
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAX66883501 (1.5)
MOSFET Power: 60R580
MainBoard: EAX66943504 (1.0)
IC MainBoard: CPU: LGE6551-DA, EMMC: THGBMBG5D1KBAIL, EEPROM: 24C256
Tuner: TDJM-G301D
Control: WI-FI: TWFM-B006D EAT61813903
Specifications 49UH619V
LG 49UH619V
General recommendations for TV LCD LED repair
Possible manifestations of defects
- LG 49UH619V 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 such cases, the power supply EAX66883501 usually fails. Its output voltages should be measured, and if they are absent, check the serviceability of the power switches (60R580) of the converters and rectifier diodes for the probability of a short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually operate in an emergency in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse often breaks.
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), in the absence of external damage and a short circuit between the terminals, are checked by replacing them with a known good one.
- 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. Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver is also faulty.
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. 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.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the EAX66943504 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - CPU: LGE6551-DA, EMMC: THGBMBG5D1KBAIL, EEPROM: 24C256 which may require replacement with new ones. If a BGA processor is installed, there is a possibility that the soldering of the contacts of its pins with the board is broken (detected by warming up).
If LG 49UH619V has no picture, but there is sound, often the HC430DGN-SLNX6-211X 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 HC430DGN-SLNX6-211X 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 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 EAX66943504 often 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 EAX66943504 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.
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 HC430DGN-SLNX6-211X 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 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 EAX66943504 often 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 EAX66943504 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.
A malfunction of the TDJM-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.
Remember! Attempts to self-repair the LG 49UH619V TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
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Additional MainBoard RepairThe appearance of the MainBoard EAX66943504 is shown in the figure below:
EAX66943504
EAX66943504 can be used in TVs:
LG 43UH619V (Panel HC430DGN-SLNXG-211X), LG 49UH603V (Panel LC490DGE (FJ)(M2)), LG 43UH603V (Panel LC430DGE (FJ)(M2)), LG 43UH610V (Panel HC430DGN-SLNX5-5112).
External view of the power supply
Main features of LG 49UH619V device:
Installed matrix (LED-panel) HC430DGN-SLNX6-211X.
Matrix control uses the Timing Controller (T-CON).
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 49UH619V TV is carried out by the EAX66883501 power supply module, or its analogs using power switches of the 60R580 type.
MainBoard - the main board (motherboard) is an EAX66943504 module using CPU chips: LGE6551-DA, EMMC: THGBMBG5D1KBAIL, EEPROM: 24C256 and others.
Tuner TDJM-G301D provides reception of television programs and tuning to channels.
TV LG 49UH619V with LCD HC430DGN-SLNX6-211X, diagonal 49 "(124 cm) 16: 9 format. The LCD-panel implements the principle of direct backlight display with rear LEDs - Direct LED.
The HC430DGN-SLNX6-211X sensor and MainBoard EAX66943504 software are capable of realizing images in the highest UHD quality at a resolution of 3840x2160 pixels in 4K UHD, HDR. Image processing is performed using modern High Dynamic Range (HDR) technology with an extended range of brightness gradations.
The 49UH619V 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, DivX, 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, component, HDMI x3, USB, Ethernet (RJ-45), Wi-Fi 802.11n, WiDi, Miracast.
The digital tuner can receive TV channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
The TV uses an EAX66883501 power supply.
Dimensions: With stand 1461x900x265 mm, Without stand 1461x845x62 mm.
Attention! The HC430DGN-SLNX6-211X panel of the LG 49UH619V 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.