Technical description and composition of the LG 32LH500D TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LH500D
Chassis / Version: WK: 1603
Panel: TPT315B5-WHBN0.K Rev: S8940L
LED backlight: GJ-2K16 GEMINI-315 D307-V1.1 (620-17mm)
T-CON: HV320WHB-N80 32HD Dual Gate_X-PCB-X0.0 47-6001317
LED driver (backlight): integrated into PSU
Power Supply (PSU): 715G7801-P02-W03-0H2M
MainBoard: 715G8003-M01-B00-0004K EBT64418101
IC MainBoard: Nand Flash: W29N01GVSIAA
Tuner: TDSY-G430D
Control: AKB74475480, IR: 715G7437-R01-000-0004M
Specifications 32LH500D
LG 32LH500D
General repair guidelines for TV LCD LED
Possible manifestations of defects
- LG 32LH500D TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
With such manifestations, a malfunction is most likely to be detected in the 715G7801-P02-W03-0H2M power supply module. It is necessary to measure its output voltages and, if they are absent, to check for short-circuit probabilities in the converters, power switches and rectifier diodes.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM), if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. 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.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- 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 715G8003-M01-B00-0004K 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 attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - Nand Flash: W29N01GVSIAA which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
The malfunction of the 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.
TV users and owners must remember that attempts to self-repair a LG 32LH500D TV without the appropriate qualifications and necessary experience can lead to serious negative consequences.................
The appearance of the MainBoard 715G8003-M01-B00-0004K is shown in the figure below:715G8003-M01-B00-0004K
Main features of the device LG 32LH500D:
Installed matrix (LED panel) TPT315B5-WHBN0.K Rev: S8940L.
The matrix control uses the Timing Controller (T-CON) HV320WHB-N80.
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 32LH500D TV is carried out by the 715G7801-P02-W03-0H2M power supply module, or its analogues.
MainBoard - the main board (motherboard) is a module 715G8003-M01-B00-0004K, using Nand Flash chips: W29N01GVSIAA and others.
The TDSY-G430D tuner provides TV reception and channel tuning.