Technical description and composition of the LG 43LH590V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 43LH590V
Chassis / Version: LD66L
Panel: HC430DUN-SLVX1-511X
LED backlight: LG lnnotek 15.5Y 43inch_FHD LED_ARRAY_Rev0.0_151013 = 43LH51_FHD_A
T-CON: 6870C-0532A
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAX66851301 (1.5) EAY64310501 G690RGLN REV-02 LGP43DS1-16CH1
MainBoard: EAX66873003 (1.0) RS71L51ENJ
Tuner: TDJA-G301D
Control: Remote: AKB74915330, IR: EBR80772102 LF5100 UF640, Wi-Fi: EAT61813903 TWFM-B006D BEJTWFMB006D
Specifications 43LH590V
LG 43LH590V
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 43LH590V TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
In some of these cases, the main switching power supply, the EAX66851301 module, is faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches and rectifier diodes in the converters for a 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.
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, the channels are switched. In some cases, the image appears when you turn 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 check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the EAX66873003 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).
In the absence of 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 voltages at the terminals of the TDJA-G301D 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.
It should be remembered! Attempts to independently repair the LG 43LH590V 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 EAX66873003 is shown in the figure below:EAX66873003
EAX66873003 can be used in TVs:
LG 43LH570V (Panel HC430DUN-SLVX1-511X), LG 43LH590V (Panel HC430DUN-SLVX1-511X).
The appearance of the power supply
Main features of the device LG 43LH590V:
Installed matrix (LED panel) HC430DUN-SLVX1-511X.
The matrix control uses the Timing Controller (T-CON) 6870C-0532A.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the LG 43LH590V TV is carried out by the EAX66851301 power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX66873003 module.
The TDJA-G301D tuner provides TV reception and channel tuning.