Technical description and composition of the LG 32LJ500V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LJ500V ZB
Chassis / Version: NT72461
Panel: TPT315B5-HVN05.A
LED backlight: LB-PF3030-GJD2P53153X7AHV2-D / B
T-CON: 32T42-C0K CTRL BD
LED driver (backlight): integrated into PSU; 23.5V 1A
Power Supply (PSU): 715G7801-P01-W10-0H2H
MainBoard: 715G8524-M01-B00-004T
IC MainBoard: NAND: W29N01GVSIAA
Tuner: TDQS-A751F (L) & TDSY-G430D
Specifications 32LJ500V
LG 32LJ500V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 32LJ500V TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Often in such cases, the 715G7801-P01-W10-0H2H power module is faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a short circuit.
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.
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.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the 715G8524-M01-B00-004T 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 cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its NAND chips: W29N01GVSIAA and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
The malfunction of the TDQS-A751F (L) & TDSY-G430D tuner 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! For users and owners of 32LJ500V TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis: NT72461 for models 32LJ500V-ZB（EU/CIS）
Service manual and schematic diagram and files -------------------------> LG 32LJ500V Chassis: NT72461
The appearance of the MainBoard 715G8524-M01-B00-004T is shown in the figure below:715G8524-M01-B00-004T
The appearance of the power supply
Main features of the device LG 32LJ500V:
Installed matrix (LED panel) TPT315B5-HVN05.A.
The matrix control uses the Timing Controller (T-CON) 32T42-C0K.
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 32LJ500V TV is carried out by the power supply module 715G7801-P01-W10-0H2H, or its analogues.
MainBoard - the main board (motherboard) is a module 715G8524-M01-B00-004T, using NAND chips: W29N01GVSIAA and others.
The TDQS-A751F (L) & TDSY-G430D tuner provides TV reception and channel tuning.
LG 32LJ500V TV with LCD TPT315B5-HVN05.A, 32 "(81 cm) 16: 9 format diagonal. The LCD panel implements the principle of direct display backlighting with rear-mounted LEDs - Direct LED.
TPT315B5-HVN05.A matrix and MainBoard 715G8524-M01-B00-004T software provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution at 1080p (Full HD). Supported media file formats: MP3, WMA, MPEG4, HEVC (H.265), DivX, MKV, JPEG.
Speaker power of 10 W (2x5 W) is provided by two speakers. The NICAM stereo audio processing system and the Sound Surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, component, HDMI x2, USB.
The digital tuner can receive TV channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
The TV uses a 715G7801-P01-W10-0H2H power supply.
Dimensions: with stand 728x475x183 mm, without stand 728x436x78 mm.
TV weight: with stand: 5 kg, without stand: 4.9 kg.
Attention! Panel TPT315B5-HVN05.A LED TV LG 32LJ500V is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.
The LED screen of the LG 32LJ500V TV requires respect from users. The glass can crack even if it is lightly hit by a child's plastic toy.
Excessive pressure on the screen surface over any part of the area is equally dangerous.
If the screen is damaged, the LED panel TPT315B5-HVN05.A must be replaced.