Technical description and composition of the LG 55UB830V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 55UB830V -ZG
Chassis / Version: LD48V
Panel: LC550EQE
LED backlight: 6 strings Edge LED
T-CON: V14 TM120 UHD Ver 0.6
LED driver (backlight): integrated into PSU; 74.9V 1.2A (55 inch)
Power Supply (PSU): EAX65613901 (1.6)
PWM Power: ICE3BR4765JZ (Standby DIP-7), IW7025, 2843B
MainBoard: EAX66085703 (1.0)
IC MainBoard: LGE7411 / LGE4331B4, 25L320BE, AT24C256C, H5TQ4G63AFR, THGBMAG5A1JBAIR, NTP7514
Tuner: TDJM-G251D
Technical Specifications 55UB830V
LG 55UB830V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 55UB830V TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
In such cases, the malfunction should be sought first in the EAX65613901 power module. It is then necessary to measure its output voltages and, if they are absent, it is necessary to check the power switches and rectifier diodes of the converters for a short-circuit probability.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
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 ICE3BR4765JZ (Standby DIP-7), IW7025, 2843B, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- 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.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. 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 EAX66085703 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). Board repair and replacement of LGE7411 / LGE4331B4, 25L320BE, AT24C256C, H5TQ4G63AFR, THGBMAG5A1JBAIR, NTP7514 microcircuits are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
If there is no reception of television channels, but the TV works properly from external devices, first of all you need to check the power supply of the tuner TDJM-G251D and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Once again, remind users! Attempts to independently repair the LG 55UB830V TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Service manual / schematic diagram ------------> LG 55UB830V Chassis LD48V. На модели 55UB830V, 55UB830V-ZB, 55UB830V-ZG
The appearance of the MainBoard EAX66085703 is shown in the figure below:EAX66085703
EAX66085703 can be used in TVs:
LG 42UB820V 42UB820V-ZH.ARUWLJU (Panel LC420EQE (PG)(M1)), LG 49UB830V (Panel LC490EQE (XG)(F2)), LG 49UB820V 49UB820V-ZH (Panel LC490EQE (XG)(F2) ), LG 40UB800V 40UB800V-ZA (Panel V400DK1-KE1).
The appearance of the power supply
Main features of the device LG 55UB830V:
Installed matrix (LED-panel) LC550EQE.
The matrix control uses the Timing Controller (T-CON) V14.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 55UB830V TV are generated by the EAX65613901 power supply module or its analogs using ICE3BR4765JZ (Standby DIP-7), IW7025, 2843B microcircuits.
MainBoard - the main board (motherboard) is an EAX66085703 module using LGE7411 / LGE4331B4, 25L320BE, AT24C256C, H5TQ4G63AFR, THGBMAG5A1JBAIR, NTP7514 and others microcircuits.
The TDJM-G251D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC550EQE-FHP1
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: 8 (G to G)
Frequency: 60Hz
Lamp Type: 6 strings WLED Without Driver
Signal Interface: V-by-One 8 lane, 51 pins
Voltage: 12.0V
