Technical description and composition of the LG 24MS53V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 24MS53V 24MS53V-PZ
Chassis / Version: LA33A
Panel: LM238WF1 (SL) (A1)
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS
MOSFET LED driver: AOD478
Power Supply (PSU): Adapter 19V
MainBoard: EAX65029603 (1.0)
IC MainBoard: CPU: LGE2122, DRAM: H5TQ4G63AFR, EEPROM: AT24C256C, AUDIO: NTP7513
Tuner: TDSQ-G601D (B)
Specifications 24MS53V
LG 24MS53V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 24MS53V TV does not turn on and does not show any signs of turning on, does not respond to the control buttons or to the remote control.
In such cases, the adapter power supply is usually faulty.
The external adapter 19V power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often 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 circuits (OOS) of stabilization. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
The most likely in these cases is a malfunction of the LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The indicator blinks or glows constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX65029603 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 must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: LGE2122, DRAM: H5TQ4G63AFR, EEPROM: AT24C256C, 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.
The failure of the TDSQ-G601D (B) 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.
Owners and users of the LG 24MS53V TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual and schematic diagram LG Chassis LA33A.
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 EAX65029603 is shown in the figure below:EAX65029603
Main features of the device LG 24MS53V:
The matrix (LED panel) LM238WF1 (SL) (A1) is installed.
To power the backlight LEDs, a converter is used, combined with the main board EAX65029603, 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 24MS53V TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX65029603 module using CPU chips: LGE2122, DRAM: H5TQ4G63AFR, EEPROM: AT24C256C, AUDIO: NTP7513 and others.
The TDSQ-G601D (B) tuner allows you to receive television programs and tune to channels.