Technical description and composition of the LG 32LJ510U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LJ510U
Chassis / Version: LD76H
Panel: SDL320H0 (BD0-B00)
LED backlight: JL.D32081235-001CS-M
T-CON: 47-6001681 B8 HV320WHB GOA HV320WHB H85
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3378E
MOSFET LED driver: AOD2922
Power Supply (PSU): DA-48G19
MainBoard: EAX67041506 (1.2) RS81N31E77
IC MainBoard: LGE6351, H27U1G8F
Tuner: TDJA-G501D
Control: IR: EBR83592701 UJ65_V1.0
Specifications 32LJ510U
LG 32LJ510U
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 32LJ510U TV does not turn on and does not show signs of being turned on, does not respond to the control buttons or to the remote control.
With such manifestations, a malfunction is most likely to be detected in the power supply. 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 any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
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.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX67041506 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). If it is not possible to replace the MB (SSB) board, you need to check the health of its elements - LGE6351, H27U1G8F. Defective components should be replaced.
The TDJA-G501D 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.
Attention TV owners! Self-repair attempts by LG 32LJ510U are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual and schematic diagram ----------------------------> LG 32LJ510U Chassis LD76H
To reduce the backlight current in LED drivers with the MP3378E PWM controller, it is necessary to proportionally increase the total resistance of the resistors from pin 3 (RISET) to the chassis. Calculation of current in milliamperes and resistance in kilo-ohms 977 / Rset for each channel. Parallel channels are summed. For example, for four parallel channels and a RISET 10 KOhm resistance, the total current will be 97.7 * 4 = 391 mA.
More details on this page
The appearance of the MainBoard EAX67041506 is shown in the figure below:EAX67041506
The appearance of the power supply
Main features of the device LG 32LJ510U:
Installed matrix (LED panel) SDL320H0 (BD0-B00).
The matrix control uses the Timing Controller (T-CON) 47-6001681.
To power the backlight LEDs, a converter is used, combined with the EAX67041506 main board, controlled by the MP3378E PWM controller. As power elements of the LED driver, keys of the AOD2922 type are used.
The formation of the necessary supply voltages for all nodes of the LG 32LJ510U TV is carried out by the DA-48G19 power supply module, or its analogs.
MainBoard - the main board (motherboard) is an EAX67041506 module, using LGE6351, H27U1G8F and other chips.
The TDJA-G501D tuner provides television reception and channel tuning.