Technical description and composition of the LG 42LF580V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LF580V
Chassis / Version: LE46B / LD46B / LD46H
Panel: LC420DUE (MG) (A3)
T-CON: 6870C-0480A TL2375EP SW5084A; TL2375EP, SW5084A
LED driver (backlight): with integrated PSU
PWM LED driver: BD9486F
Power Supply (PSU): EAX65423701 (2.0) LGP3942I-14PL1 EAY63071905
PWM Power: MAP8800 (PFC), FA6A01N, NR134S
MOSFET Power: TK7P60W
MainBoard: EAX65610906 (1.1)
IC MainBoard: 24C256, H5TQ4G63CFR-RDC
Tuner: TDJM-G101D EBL61400501
Specifications 42LF580V
LG 42LF580V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 42LF580V TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
With such manifestations, in some cases, the EAX65423701 power module is faulty. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches (TK7P60W) and rectifier diodes of the converters for possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
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 chips MAP8800 (PFC), FA6A01N, NR134S are usually checked by replacing with new ones, or obviously working.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
Often in such cases, there is no LED backlight. 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 EAX65610906 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). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - 24C256, H5TQ4G63CFR-RDC. Defective components should be replaced.
Before changing the tuner TDJM-G101D EBL61400501, if it is not possible to tune to television channels, make sure that there are supply voltages that need to 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
TV users and owners must remember that attempts to self-repair an LG 42LF580V TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
SCHEMATIC DIAGRAM ---------> LG 42LF580V Chassis LD46H. Model: 42LF580* 42LF580*-ZA; Chassis LD46H
Backlight Current Limit:
In televisions with power supplies LGP3942-14PL1 (EAX65423701), the backlight current sensor - the resistor block R811-R818 consists of four pairs of 4.3 Ohm each. You can reduce the backlight current by 25% by removing one pair of resistors.
The appearance of the MainBoard EAX65610906 is shown in the figure below:EAX65610906
The appearance of the power supply
Main features of the device LG 42LF580V:
Installed matrix (LED-panel) LC420DUE (MG) (A3).
The matrix control uses the Timing Controller (T-CON) 6870C-0480A.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the BD9486F PWM controller.
The necessary supply voltages for all nodes of the LG 42LF580V TV are generated by the EAX65423701 power supply module or its analogs using MAP8800 (PFC), FA6A01N, NR134S microchips and TK7P60W power switches.
MainBoard - the main board (motherboard) is an EAX65610906 module, using 24C256 chips, H5TQ4G63CFR-RDC and others.
Tuner TDJM-G101D EBL61400501 provides the reception of television programs and tuning to channels.