Technical description and composition of the LG 32LJ519U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LJ519U
Chassis / Version: LD76H
Panel: HC320DXN-ABSL2-2143
LED backlight: SSC_32LJ61_HD_S
T-CON: 32AD Dual Gate_X-PCB-X0.0
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): DA-48G19 Adapter 19V
MainBoard: EAX67041505 (1.0) EBU64424120
IC MainBoard: CPU: LGE6351, Audio: NTP7515D, NAND FLASH: H27U1G8F2CTR
Tuner: DJA-G501D
Control: IR: EBR83592703 UJ65_V1.0
Specifications 32LJ519U
LG 32LJ519U
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 32LJ519U TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
With such manifestations, a malfunction is most likely to be detected in the Adapter power module.
The external adapter DA-48G19 19V power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
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 is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it 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). Often, the MB (SSB) card needs to be replaced in case of complex faults that are difficult to detect. When trying to repair, you should check its elements - CPU: LGE6351, Audio: NTP7515D, NAND FLASH: H27U1G8F2CTR and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Before replacing the tuner DJA-G501D, 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
Attention TV owners! Attempts at self-repair of LG 32LJ519U are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual and schematic diagram --------------------> LG 32LJ519U Chassis LD76H
The appearance of the MainBoard EAX67041505 is shown in the figure below:EAX67041505
The appearance of the power supply
Main features of the device LG 32LJ519U:
Installed matrix (LED panel) HC320DXN-ABSL2-2143.
The matrix control uses the Timing Controller (T-CON) 32AD.
To power the backlight LEDs, a converter is used, combined with the main board EAX67041505.
To power all the internal components of the LG 32LJ519U TV, an external source such as DA-48G19 Adapter 19V is used.
MainBoard - the main board (motherboard) is an EAX67041505 module, using CPU chips: LGE6351, Audio: NTP7515D, NAND FLASH: H27U1G8F2CTR and others.
The DJA-G501D tuner provides TV reception and channel tuning.