Technical description and composition of the LG 32LF510B TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 32LF510B ZB
Chassis / Version: LD55B
Panel: HC320DXN-ABNS4 / 5112
LED backlight: String: HD.LF51
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS
Power Supply (PSU): Adapter 19V
MainBoard: EAX66453203 (1.0) - EBT64049804
IC MainBoard: CPU: LGE2136; EEPROM (IC104): AT24C256 SPI Flash (IC1300): MX25L8035E
Tuner: TDJS-G101D (A)
Appearance
LG 32LF510B
General repair guidelines for TV LCD LED
In cases where the LG 32LF510B TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light or flash, there are no sounds and signs of operability when turning on - most likely the adapter 19V power supply module is faulty or there is no standby power.
When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the rectifier bridge of the mains voltage and the power key (s) of the converter. The complete inoperability of the power supply unit can be caused by a short circuit in the power elements in the primary circuit, followed by an open fuse, or a short circuit in the loads. In difficult cases of malfunctions, the adapter type power module can sometimes be replaced with a new one.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but the sound is there and other functions work, there is a high probability of a malfunction of the LED backlight LED-String: HD.LF51.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It is necessary to disassemble the panel and check the LEDs themselves, the soldering of their conclusions, as well as the reliability of the connections in the connectors and the soldering of the conclusions of the connectors.
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.
The motherboard EAX66453203 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: LGE2136; EEPROM (IC104): AT24C256 SPI Flash (IC1300): MX25L8035E which may require replacement with new ones. Suspicions of a malfunction of the LGE2136 processor made using BGA technology can be triggered by a violation of the contact of its conclusions with the board (it is diagnosed by heating).
The malfunction of the TDJS-G101D (A) tuner is established after checking the software, as well as all the supply voltages at its terminals and the presence of data exchange with the processor.
Attention! Users and owners of 32LF510B televisions who do not have the appropriate qualifications, knowledge and experience are strongly advised against self-repair attempts in order to avoid negative consequences that could lead to complete non-repairability of the device.
SCHEMATIC MANUAL LG Chassis LD55A LD55B Model 32LF510U, 32LF510U-ZB, 32LF510B, 32LF510B-ZB.
To reduce the backlight current in LED drivers with the DT1641AS controller (DT1641S), you can increase the total resistance of the resistors from pin 7 (RISET) to the chassis. The exact proportional dependence may not be observed if there is additional control on this input, then the ratings should be selected empirically.
More details on this page
The appearance of the MainBoard EAX66453203 is shown in the figure below:
EAX66453203
Main features of the device LG 32LF510B:
Installed matrix (LED-panel) HC320DXN-ABNS4 / 5112.
To power the backlight LEDs, a converter is used, combined with the main board EAX66453203, controlled by the DT1641AS PWM controller.
To power all the internal components of the LG 32LF510B TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX66453203 module, using CPU chips: LGE2136; EEPROM (IC104): AT24C256 SPI Flash (IC1300): MX25L8035E and others.
Tuner TDJS-G101D (A) provides the reception of television programs and tuning to channels.