Technical description and composition of the LG 50LF653V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 50LF653V
Chassis / Version: LD51H
Panel: LC500DUH (MG) (P1)
LED backlight: DRT 3.0 50_A / B type Rev02 # 1_140218
LED driver (backlight): with integrated PSU
Power Supply (PSU): EAX66203101 (1.8) LGP4760R1-15CH2
MainBoard: EAX66207203 (1.0) RD63321E3X, 4.01.00
IC MainBoard: K4B4G1646D-BCK0, TPS65175B, NTP7515D
Tuner: TDJM-G301D
Control: WiFi: 2703H-LGSBW41 BEJLGSBW41 EAT62093301
Specifications 50LF653V
LG 50LF653V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 50LF653V does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
In some of these cases, a malfunction is detected in the EAX66203101 power module. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits are usually checked by replacement with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
In some of these cases, the malfunction is caused by the lack of a backlight 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 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.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX66207203 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).
The TDJM-G301D tuner malfunction 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 controlled by an oscilloscope.
We recommend the owners of the 50LF653V TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
Service manual / schematic diagram ------------> LG 50LF653V Chassis LD51H
50LF65** 50LF65*-Z*
manual / ------------> WiFi- LG Wi-Fi Module LGSBW41
The appearance of the MainBoard EAX66207203 is shown in the figure below:EAX66207203
EAX66207203 can be used in TVs:
LG 50LF653V (Panel LC500DUH (MG)(P1)), LG 40LF630V 40LF630V-ZA.BRUJLDU (Panel V400HJ6-PE2 HC400DUN-VCKN1-214X), LG 40LF634V (Panel V400HJ6-PE2 Rev.C1 HC400DUN-VCKN1-214X).
The appearance of the power supply
Main features of the device LG 50LF653V:
Installed matrix (LED-panel) LC500DUH (MG) (P1).
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 50LF653V TV is carried out by the EAX66203101 power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX66207203 module, using microcircuits K4B4G1646D-BCK0, TPS65175B, NTP7515D and others.
The TDJM-G301D tuner provides TV reception and channel tuning.
