Technical description and composition of the LG 23MA73D TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 23MA73D
Chassis / Version: LD31Q / M73D
Panel: LM230WF3 (SS) (A1)
LED backlight: EDGE LED
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS
MOSFET LED driver: AOD478
Power Supply (PSU): Adapter 19V
MainBoard: EAX65048803
IC MainBoard: CPU: LGE2121-MC, SPI FLASH: W25Q80, EEPROM: 24C256, Audio: NTP7513
Tuner: TDSS-G501D EBL61240203
Specifications 23MA73D
LG 23MA73D
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 23MA73D TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or to the remote control.
With such manifestations, a malfunction is most likely to be detected in the Adapter power module.
This TV model is equipped with an external power adapter type Adapter 19V, which the owner can purchase independently, and repairing it may not always be advisable, however, sometimes there is a certain sense to open it and eliminate simple typical defects typical of IPS. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
In such cases, the most likely malfunction of the LED backlight elements. 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: LGE2121-MC, SPI FLASH: W25Q80, EEPROM: 24C256, Audio: NTP7513. BGA chip malfunctions are usually easy to detect by warming up.
Before changing the tuner TDSS-G501D EBL61240203, if it is not possible to tune to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
For 23MA73D TV owners, we recommend that you contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
service manual and schematic diagram --------------------> LG 23MA73D Chassis LD31Q
FIRMWARE SPI FLASH -----> LG 23MA73D LD31Q / M73D, Main: EAX65048803, Panel: LM230WF3 (SS)(A1).
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 23MA73D:
Installed matrix (LED-panel) LM230WF3 (SS) (A1).
To power the backlight LEDs, a converter is used, combined with the EAX65048803 main board, 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 23MA73D 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.
Additional technical information about the panel:
Brand: LG Display
Model: LM230WF3-SSA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.0 inch
Resolution: 1920x1080, FHD
Display Mode: AH-IPS, Normally Black, Transmissive
Active Area: 509.184x286.416 mm
Surface: Clear
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 14 (G to G)
Frequency: 60Hz
Lamp Type: 16S3P WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V