Technical description and composition of the LG 43LJ515V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 43LJ515V
Chassis / Version: LD76H
Panel: LC430DUE-FJA1
LED backlight: 6916L-2743B 43 V16.5 ART3 2743 Rev0.02
T-CON: 6870C-0532C
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): Adapter 19V
MainBoard: EAX67041505 (1.0)
IC MainBoard: CPU: LGE6351, Audio: NTP7515D, NAND FLASH: H27U1G8F2CTR
Tuner: TDJA-G501D
Control: IR: EBR83592901 LJ51_Ver1.0
Specifications 43LJ515V
LG 43LJ515V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 43LJ515V TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
With such manifestations, the Adapter power module usually fails.
This TV model is equipped with an external power adapter type Adapter 19V, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes there is a certain sense to open it and eliminate simple typical defects typical of IPS. 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 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 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 an excess of the maximum current or voltage. 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, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
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 of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. 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 EAX67041505 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). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - CPU: LGE6351, Audio: NTP7515D, NAND FLASH: H27U1G8F2CTR with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Before replacing the TDJA-G501D tuner, if there is no tuning to 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
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
The appearance of the MainBoard EAX67041505 is shown in the figure below:EAX67041505
Main features of the device LG 43LJ515V:
Installed matrix (LED-panel) LC430DUE-FJA1.
The matrix control uses the Timing Controller (T-CON) 6870C-0532C.
To power the backlight LEDs, a converter is used, combined with the main board EAX67041505.
To power all the internal components of the LG 43LJ515V TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX67041505 module, using CPU chips: LGE6351, Audio: NTP7515D, NAND FLASH: H27U1G8F2CTR and others.
The TDJA-G501D tuner provides television reception and channel tuning.