Technical description and composition of the LG 24MA53D TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 24MA53D -PZ
Chassis / Version: LD31Q
Panel: LM238WF1 (SL) (A1)
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS
MOSFET LED driver: AOD478
Power Supply (PSU): Adapter 19V
MainBoard: EAX65048803 (1.0)
IC MainBoard: CPU: LGE2121-MC, SPI FLASH: W25Q80, EEPROM: 24C256, Audio: NTP7513
Tuner: TDSS-G501D EBL61240203
Technical Specifications 24MA53D
LG 24MA53D
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 24MA53D TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
With such manifestations, the Adapter power module usually fails.
The owner of the TV can purchase an external power supply unit such as Adapter and repairing it is not always advisable. In any case, the simplest typical defects characteristic of most IIP schemes can be easily detected and eliminated after opening. 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 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 most often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and 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.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX65048803 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). Often, the MB (SSB) card needs to be replaced in case of complex faults that are difficult to detect. When trying to repair, you should check its elements - CPU: LGE2121-MC, SPI FLASH: W25Q80, EEPROM: 24C256, Audio: NTP7513 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
In cases where there is no tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the TDSS-G501D EBL61240203 tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
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 EAX65048803 is shown in the figure below:EAX65048803
EAX65048803 can be used in TVs:
LG 24MA53D-PZ (Panel LM238WF1 (SL) (A1)), LG 23MA73D (Panel LM230WF3 (SS) (A1)).
Main features of the device LG 24MA53D:
The matrix (LED panel) LM238WF1 (SL) (A1) is installed.
To power the backlight LEDs, a converter is used, combined with the main board EAX65048803, controlled by the DT1641AS PWM controller. As the power elements of the LED driver, keys of the AOD478 type are used.
To power all the internal components of the LG 24MA53D TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX65048803 module using CPU chips: LGE2121-MC, SPI FLASH: W25Q80, EEPROM: 24C256, Audio: NTP7513 and others.
The TDSS-G501D EBL61240203 tuner provides TV reception and channel tuning.