Technical description and composition of the LG 49UB850V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 49UB850V
Panel: LC490EQE (XG) (F2)
LED backlight: 6922L-0128A, 49 V14 ART5 TV REV0.31 R-Type / L-Type 6920L-0001C
T-CON: 6870C-0502B
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAX65613901 (1.6) - EAY63149401, LGP4955-14UL12
PWM Power: ICE3BR4765JZ (Standby DIP-7)
MainBoard: EAX65684604 (1.0) - ETB63174501 - GO44E10R8S
IC MainBoard: CPU: LG1154D; DRAM: H5TQ4G83AFR-PBC; EEPROM: AT24C256C; SPI: MX25L3206EM2I
Tuner: TDJM-G251D
Control: AKB73715679, IR: EBR78101302 UB8600, WiFi: 2703H-LGSBW41, BEJLGSBW41
Specifications 49UB850V
LG 49UB850V
General repair guidelines for TV LCD LED
Possible manifestations of defects
- LG 49UB850V TV does not turn on. There are no signs of operability. The indicators on the front panel do not shine and do not blink, and the remote control and control buttons do not respond.
Often in such cases, the EAX65613901 power module is faulty. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a possible short circuit.
During thermal and avalanche breakdowns of semiconductors in 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. PWM ICE3BR4765JZ (Standby DIP-7) may also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
The most likely in these cases is a malfunction of the LED backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX65684604 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). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - CPU: LG1154D; DRAM: H5TQ4G83AFR-PBC; EEPROM: AT24C256C; SPI: MX25L3206EM2I. Defective components should be replaced.
Before replacing the TDJM-G251D tuner, if there is no tuning for 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! For users and owners of 49UB850V TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
Service manual / schematic diagram --------------> LG 49UB850V Chassis .
CHASSIS : LD41V; MODEL : 49UB850V, 49UB850V-ZA
User Manual WiFi ---------------------------> LG Wi-Fi Module LGSBW41
The appearance of the MainBoard EAX65684604 is shown in the figure below:EAX65684604
EAX65684604 can be used in TVs:
LG 49UB850V (Panel LC490EQE (XG)(F2)), LG 55UB850V ZA (Panel LC550EQE (PG)(F2)).
The appearance of the power supply
Main features of the device LG 49UB850V:
Installed matrix (LED-panel) LC490EQE (XG) (F2).
The matrix control uses the Timing Controller (T-CON) 6870C-0502B.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 49UB850V TV are generated by the EAX65613901 power module, or its analogs using ICE3BR4765JZ (Standby DIP-7) microcircuits.
MainBoard - the main board (motherboard) is an EAX65684604 module, using CPU chips: LG1154D; DRAM: H5TQ4G83AFR-PBC; EEPROM: AT24C256C; SPI: MX25L3206EM2I and others.
The TDJM-G251D tuner provides TV reception and channel tuning.
