Technical description and composition of the LG 42LB582V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LB582V
Chassis / Version: LD46B
Panel: LC420DUE (FG) (A4)
LED backlight: 6916L-1957A, 6916L-1956A
T-CON: 6870C-0480A
LED driver (backlight): integrated into PSU
PWM LED driver: BD9486F
MOSFET LED driver: 4NF20, MDD3752
Power Supply (PSU): EAX65423701 2.0
PWM Power: MAP8800 (PFC), FA6A01N (PWM resonant), NR134S
MOSFET Power: TK7P60W, 60R360P
MainBoard: EAX65610905 1.0
IC MainBoard: EEPROM: 24C256, Audio: NTP7513, OVER: D9PXV, D9PTK, 100GEA, TPA6138
Tuner: TDJM-G101D
Specifications 42LB582V
LG 42LB582V
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The LG 42LB582V 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 EAX65423701 power supply module usually fails. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (TK7P60W, 60R360P) and rectifier diodes in the converters for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually 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 chips MAP8800 (PFC), FA6A01N (PWM resonant), NR134S are usually checked by replacing with new ones, or obviously working.
- 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.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its 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 EAX65610905 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 (SSB) card, you need to check the health of its elements - EEPROM: 24C256, Audio: NTP7513, OVER: D9PXV, D9PTK, 100GEA, TPA6138. Defective components should be replaced.
Before replacing the TDJM-G101D tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Owners and users of the LG 42LB582V TV should 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!
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.
schematic diagram ------------> LG 42LB582V Chassis LD46B
MODELS: 42LB5800, 42LB580V, 42LB5820, 42LB582V -Z*, 42LB588V -TA
The appearance of the MainBoard EAX65610905 is shown in the figure below:EAX65610905
EAX65610905 can be used in TVs:
LG 47LB580V (Panel LC470DUE (FG)(A4)), LG 42LB572V (Panel LC420DUE (FG)(A4)), LG 32LF580U 32LF580U-ZA.ARUWLDU (Panel NC320DXN VSBP5), LG 32LB572U (Panel NC320DXN VSBP2).
The appearance of the power supply
Main features of the device LG 42LB582V:
Installed matrix (LED-panel) LC420DUE (FG) (A4).
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. As power elements of the LED driver, keys of the type 4NF20, MDD3752 are used.
The necessary supply voltages for all nodes of the LG 42LB582V TV are generated by the EAX65423701 power supply module or its analogs using MAP8800 (PFC), FA6A01N (PWM resonant), NR134S microchips and TK7P60W, 60R360P type power switches.
MainBoard - the main board (motherboard) is an EAX65610905 module, using EEPROM chips: 24C256, Audio: NTP7513, OVER: D9PXV, D9PTK, 100GEA, TPA6138 and others.
The TDJM-G101D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC420DUE-FGA4
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
Contrast Ratio: 1200: 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