Technical description and composition of the LG 32LF564U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LF564U
Chassis / Version: LC55M / LD55T / LB55T
Panel: LC320DXE (MG) (A3) // NC320XH VSBP5
LED driver (backlight): integrated into PSU; 119V 250mA
PWM LED driver: BD559
MOSFET LED driver: TK5P50D
Power Supply (PSU): LGP32D-15CH1
MainBoard: EAX66203803 (1.0) // EAX66203805 (1.2)
IC MainBoard: CPU: LGE2134; NAND Flash: TC58NVG0S3HTA00; SPI Flash: MX25L8035EM2I; EEPROM: 24C256;
Tuner: TDJM-G301D
Specifications 32LF564U
LG 32LF564U
General repair guidelines for TV LCD LED
It is advisable to start repairing the LG 32LF564U TV with a careful external examination of both internal and external elements. Based on visible external changes in the state of the components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before making the necessary measurements. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a significant clue in the assumptions about the causes and consequences of the malfunction.
If the LGP32D-15CH1 power supply module fails, the external manifestations may be different, for example, the LG 32LF564U does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
Sometimes the LG 32LF564U TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the LC320DXE (MG) (A3) panel backlight LED converter, or a break in the LED circuit is possible. In such cases, first of all, it is necessary to verify the serviceability of all the electrolytic capacitors of the filter by supplying the LED driver itself, including in the power supply unit (power supply unit).
To check the health of the LEDs, as well as contact connections in the ruler circuit, the panel must be disassembled.
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.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
Before replacing the TDJM-G301D tuner, if there is no tuning to the channels, first check the supply voltage at its terminals, including the varicap supply (30-33V).
It should be remembered! Attempts to repair the LG 32LF564U TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
One of the typical failures of the LG 32LF564U often occurs in the LG panel LC320DXE (MG) (A3).
LEDs must be replaced, and the maximum current from the driver should be limited to 10-20%.External manifestations: there is no image, the backlight does not work. In most such cases, the LEDs turn out to be malfunctioning, which during testing turn out to be either in a cliff or with broken internal zener diodes.
More details on this page
SCHEMATIC MANUAL --------> LG CHASSIS LB55T MODEL: 32LF56*D/56*T/56*Y/56*Z, 32LF56*D/56*T/56*Y/56*Z-T*.
32LF564V Panel: LC320DUE(MG)(A3); Main EAX66203803(1.0), T-con 6870C-0488A LC320DUE-VGM1, Power: EAX66171501(1.9) LGP32D-15CH1
The appearance of the MainBoard EAX66203803 is shown in the figure below:EAX66203803
The appearance of the power supply
Main features of the device LG 32LF564U:
Installed matrix (LED-panel) LC320DXE (MG) (A3) or NC320XH VSBP5.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by a BD559 PWM controller. As the power elements of the LED driver, keys of the TK5P50D type are used.
The formation of the necessary supply voltages for all nodes of the LG 32LF564U TV is carried out by the LGP32D-15CH1 power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX66203803 module, using CPU chips: LGE2134; NAND Flash: TC58NVG0S3HTA00; SPI Flash: MX25L8035EM2I; EEPROM: 24C256; and others.
The TDJM-G301D tuner provides TV reception and channel tuning.