Technical description and composition of the LG 23MT75V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 23MT75V 23MT75V-PZ.ARUJLPU
Chassis / Version: LW40A / MT75D
Panel: LC230WF3 (SS) (E1)
LED backlight: 6916L-1615A 230WF3
T-CON: 6870S-1617A
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): LCAP16B-E
MainBoard: EAX65589705 (1.1)
Control: Remote: AKB73975786
Specifications 23MT75V
LG 23MT75V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 23MT75V 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.
With such manifestations, the LCAP16B-E power supply module usually fails. 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 the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits are usually checked by replacement with new ones, 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.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, you can sometimes detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX65589705 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).
It should be remembered! Attempts to self-repair the LG 23MT75V TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
The appearance of the MainBoard EAX65589705 is shown in the figure below:EAX65589705
The appearance of the power supply
Main features of the device LG 23MT75V:
The matrix control uses the Timing Controller (T-CON) 6870S-1617A.
To power the backlight LEDs, a converter is used, combined with the main board EAX65589705.
The formation of the necessary supply voltages for all nodes of the LG 23MT75V TV is carried out by the LCAP16B-E power supply module, or its analogues.
MainBoard - the main board (motherboard) is an EAX65589705 module.