Technical description and composition of the LG 42LN570V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LN570V
Chassis / Version: LD33B / LC33B / LE33B
Panel: LC420DUE (SF) (R3)
LED backlight: Led 42 ROW2.1 Rev0.0 1 R2-Type 6916L-1385A / 86A / 87A / 88A / 6637L-0025A
T-CON: 6870C-0452A, LC500DUE-SFR1
LED driver (backlight): integrated into PSU; 157V 341mA
PWM LED driver: MAP3202
MOSFET LED driver: FDT86106, STF10NM60N
Power Supply (PSU): EAX64905301 (2.0) LGP42-13PL1
PWM Power: SSC1S311A (PWM flyback), NR891D (PWM Step-down 24/12)
MOSFET Power: MDF11N65B
MainBoard: EAX64797004
IC MainBoard: LGE2122 1402-BTAN, NAND: 3DAI8 JW857, H5TQ4G63AFR
Tuner: TDSQ-G601D (B)
Control: AKB73715601, IR: EBR77031901
Specifications 42LN570V
LG 42LN570V
General repair guidelines for TV LCD LED
If the LG 42LN570V does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the EAX64905301 (2.0) LGP42-13PL1 power module. In some cases, only the processor power regulator may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
The reasons for the breakdown of the power switch in switching power supplies (IIPS) can be different, for example, a malfunction of semiconductor elements or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller SC1S311, NR891D or broken resistors in its bundle.
If the LG 42LN570V TV does not have an image, but there is sound, a malfunction in the backlight circuits of the LED panel in the LED strips of the Led 42 ROW2.1 Rev0.0 1 R2-Type 6916L-1385A / 86A / 87A / 88A / 6637L-0025A is likely. More often this requires disassembling the panel.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check the 3-volt LEDs individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the LED will light up slightly. Dual LEDs 6V 2W are thus more difficult to check, but it is possible to indirectly judge its serviceability by the presence of a zener diode transition and the absence of a circuit.
Repair of the EAX64797004 motherboard must begin with the diagnosis and verification of all linear stabilizers and power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements LGE2122 1402-BTAN, NAND: 3DAI8 JW857, H5TQ4G63AFR. BGA chip malfunctions are usually easy to detect by warming up.
If a TDSQ-G601D (B) tuner is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels at the corresponding terminals of the tuner.
Owners and users of the LG 42LN570V TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC DIAGRAM ----------> LG MODEL 42LN57** -Z*; 42LN570S, 42LN570V, 42LN575S, 42LN575V, 42LN577S, 42LN577V, 42LN578V, 42LN5708, 42LN5758, 42LN5778.
SCHEMATIC DIAGRAM ----------> LG 37/39/42 Inch LGP3739-13PL1, LGP42-13PL1.
LG 42LN570N-ZE .BRUYLJU; Panel: LC420DUE (SF)(R1), Main: EAX64797004(1.1) EBR76823157
The appearance of the MainBoard EAX64797004 is shown in the figure below:EAX64797004
EAX64797004 can be used in TVs:
LG 42LA660S ZA 42LA660V (Panel LC420EUH (PF)(P1) 120 Hz), LG 32LA620V (Panel LC320DUE (SF)(U1)), LG 42LN570V (Panel LC420DUE (SF)(R3)), LG 50LA620V ZA (Panel LC500DUE (SF)(U1)), LG 32LN575S (Panel LC320DUE (SF)(R1)), LG 42LA669V 42LA669V-ZE.BRUZLJU (Panel LC420EUH (PF)(P1)).
The appearance of the power supply
Main features of the device LG 42LN570V:
Installed matrix (LED-panel) LC420DUE (SF) (R3).
The matrix control uses the Timing Controller (T-CON) 6870C-0452A.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the MAP3202 PWM controller. As the power elements of the LED driver, keys of the type FDT86106, STF10NM60N are used.
The necessary supply voltages for all nodes of the LG 42LN570V TV are generated by the EAX64905301 power module or its analogs using SSC1S311A (PWM flyback), NR891D (PWM Step-down 24/12) microcircuits and MDF11N65B type power switches.
MainBoard - the main board (motherboard) is an EAX64797004 module using LGE2122 1402-BTAN chips, NAND: 3DAI8 JW857, H5TQ4G63AFR and others.
The TDSQ-G601D (B) tuner allows you to receive television programs and tune to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420DUE-SFR3
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 927.94x521.96 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 370 cd / m²
Contrast Ratio: 1050: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V