Technical description and composition of the LG 55UB850V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 55UB850V ZA
Chassis / Version: LD41V
Panel: LC550EQE (PG) (F2)
T-CON: 6870C-0502C Halogen Free V14 TM120 UHD Ver0.6
LED driver (backlight): integrated into PSU; 74.9V 1.2A (55 inch)
Power Supply (PSU): EAX65613901 (1.6) - EAY63149401 - LGP4955-14UL12
PWM Power: ICE3BR4765JZ (Standby DIP-7)
MainBoard: EAX65684604 (1.0)
IC MainBoard: CPU: LG1154D; DRAM: H5TQ4G83AFR-PBC; EEPROM: AT24C256C; SPI: MX25L3206EM2I
Tuner: TDJM-G251D
Control: WIFI :: LGSBW41 IC: 2703H-LGSBW41
Technical Specifications 55UB850V
LG 55UB850V
General repair guidelines for TV LCD LED
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain chance that the power supply module EAX65613901 (1.6) - EAY63149401 - LGP4955-14UL12 is faulty and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of standby power. After checking the mains fuse and power elements of the primary power supply circuit, it should also check the absence of a short circuit in the loads of the secondary rectifiers.
Power switches in switching power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the ICE3BR4765JZ PWM controller chip (Standby DIP-7), which can only be checked by replacing it with a new or obviously working one.
If the LG 55UB850V does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the backlight circuits of the LC550EQE (PG) panel (F2) is likely. LEDs or their power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the backlight assembly.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
Repair of the EAX65684604 motherboard (1.0 you need to start with the diagnosis and verification of all linear stabilizers and power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: LG1154D; DRAM: H5TQ4G83AFR-PBC; EEPROM: AT24C256C; SPI: MX25L3206EM2I. BGA chip malfunctions are usually easy to detect by warming up.
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
For owners of the 55UB850V TV, we recommend that you contact qualified professionals with experience to repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
Service manual / schematic diagram ------------> LG CHASSIS: LD41V; MODEL: 55UB850V, 55UB850V-ZA.
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 55UB850V:
Installed matrix (LED-panel) LC550EQE (PG) (F2).
The matrix control uses the Timing Controller (T-CON) 6870C-0502C.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 55UB850V TV are generated by the EAX65613901 power supply 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.
Additional technical information about the panel:
Brand: LG Display
Model: LC550EQE-PGF2
Type: a-Si TFT-LCD, Panel
Diagonal size: 55 inch
Resolution: 3840x2160, UHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 1209.6x680.4 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 400 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: V-by-One 8 lane, 51 pins
Voltage: 12.0V
