Technical description and composition of the LG M2232D TV, panel type and applicable modules. The composition of the modules.LG LED
Model: M2232D
Chassis / Version: LD02M
Panel: LM215WF-4
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641S
Power Supply (PSU): Adapter 19V
MainBoard: EAX64559005 (1.0)
IC MainBoard: LGE2111A-TB, H27U1G8F2, 25Q80, NTP-7500L
Tuner: TDSN-G301D
Control: AKB73655822
Technical Specifications M2232D
LG M2232D
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG M2232D TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
With such manifestations, in some cases, the Adapter power module is faulty.
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 supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
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 (OOS) stabilization circuits. PWM controllers (PWM), if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In such cases, the most likely malfunction of the LED backlight elements. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the EAX64559005 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). When repairing an MB board, you need to check its components LGE2111A-TB, H27U1G8F2, 25Q80, NTP-7500L. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
The malfunction of the TDSN-G301D tuner is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
For owners of the M2232D TV, 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!
FIRMWARE SPI FLASH ------------> LG M2232D LD02M, Main: EAX64559005 (1.0), Panel: LM215WF-4
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 EAX64559005 is shown in the figure below:EAX64559005
EAX64559005 can be used in TVs:
LG M2432D (Panel M236HGE-L20 Rev. C1), LG M2352T PZN (Panel LM230WF3 (SL) (E1)), LG M2232D (Panel LM215WF-4).
Main features of the device LG M2232D:
Installed matrix (LED-panel) LM215WF-4.
To power the backlight LEDs, a converter is used, combined with the EAX64559005 main board, controlled by the DT1641S PWM controller.
To power all the internal components of the LG M2232D TV, an external adapter 19V type source is used.
MainBoard - the main board (motherboard) is an EAX64559005 module, using LGE2111A-TB, H27U1G8F2, 25Q80, NTP-7500L and other chips.
The TDSN-G301D tuner provides television reception and channel tuning.
