Technical description and composition of the LG 32LJ600U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LJ600U
Chassis / Version: LB75K / LD75K
Panel: HC320DXN-ABVSA-2141
LED backlight: SSC 32LJ57 5LED-REV00
T-CON: HV320WHB-N50 NV320WHBN55
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3378E
MOSFET LED driver: AOD2922
Power Supply (PSU): Adapter 19V
MainBoard: EAX67246903 (1.0)
IC MainBoard: EEPROM: 24C256. eMMC: 4GB, AUDIO: NTP7515D, Sub Micom: R5F100GEAFB
Tuner: TDJA-G501D
Control: IR: EBR83593001, RF: LGSWFAC71 EAT63435701
Specifications 32LJ600U
LG 32LJ600U
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 32LJ600U TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
In some of these cases, the main switching power supply, the Adapter module, is faulty.
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 operability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
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.
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.
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 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 EAX67246903 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) card, you need to check the health of its elements - EEPROM: 24C256. eMMC: 4GB, AUDIO: NTP7515D, Sub Micom: R5F100GEAFB. Defective components should be replaced.
If the TV works normally from external devices, but does not tune into television channels, the TDJA-G501D may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Owners and users of the LG 32LJ600U 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 ----------------------------> LG 32LJ600U Chassis LD75K
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 EAX67246903 is shown in the figure below:EAX67246903
Main features of the device LG 32LJ600U:
Installed matrix (LED-panel) HC320DXN-ABVSA-2141.
The matrix control uses the Timing Controller (T-CON) HV320WHB-N50.
To power the backlight LEDs, a converter is used, combined with the EAX67246903 main board, controlled by the MP3378E PWM controller. As power elements of the LED driver, keys of the AOD2922 type are used.
To power all the internal components of the LG 32LJ600U TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX67246903 module, using EEPROM chips: 24C256. eMMC: 4GB, AUDIO: NTP7515D, Sub Micom: R5F100GEAFB and others.
The TDJA-G501D tuner provides television reception and channel tuning.