Technical description and composition of the LG 55UC970V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 55UC970V
Chassis / Version: LD41V
Panel: LC550CQN (FG) (F1)
LED backlight: LED 55 V15 SLIM DRT REV0.5
T-CON: 6870C-0524A
LED driver (backlight): integrated into PSU
Power Supply (PSU): LGP5565-14UC EAY63368701
MainBoard: EAX66104204 (1.0) EBT63455601 62904501
IC MainBoard: CPU: LG1154, SPI Flash: MX25L3206, Audio: NTP7514
Tuner: TDJM-G251D EBL61400503
Control: WIFI & BT: LGSBW1 EAT62093301
Technical Specifications 55UC970V
LG 55UC970V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 55UC970V TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Often in such cases, the LGP5565-14UC power module is faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke the excess of maximum current or voltage values. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. 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.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX66104204 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).
Before changing the tuner TDJM-G251D EBL61400503, if it is not possible to tune to television channels, make sure that there are supply voltages that need to be measured on the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Owners and users of the LG 55UC970V TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual / schematic diagram ------------> LG 55UC970V Chassis LD41V
The appearance of the MainBoard EAX66104204 is shown in the figure below:EAX66104204
Main features of the device LG 55UC970V:
Installed matrix (LED-panel) LC550CQN (FG) (F1).
The matrix control uses the Timing Controller (T-CON) 6870C-0524A.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the LG 55UC970V TV is carried out by the power module LGP5565-14UC, or its analogues.
MainBoard - the main board (motherboard) is an EAX66104204 module, using CPU chips: LG1154, SPI Flash: MX25L3206, Audio: NTP7514 and others.
Tuner TDJM-G251D EBL61400503 provides the reception of television programs and tuning to channels.
