Technical description and composition of the LG 42LV4500 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LV4500 DA
Chassis / Version: LT01U
Panel: LC420EUF (SD) (A1)
T-CON: 6870C-0358A
LED driver (backlight): integrated into PSU
Power Supply (PSU): EAX62865401 / 8 LGP4247-11SLPB
PWM Power: FAN7930B (PFC), 3BR4765JZ (Standby), L6599AD (PWM Resonant)
MainBoard: EAX64290501 (0)
IC MainBoard: LGE107DC-R-T8, 25L8006E, 24C08WI
Tuner: TDTJ-S001D EBL60721201
Control: AKB73275612
Specifications 42LV4500
LG 42LV4500
General repair guidelines for TV LCD LED
In cases where the LG 42LV4500 TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel are lit or blinking, and there are no sounds and no signs of operability when turning on, the EAX62865401 / 8 LGP4247- power supply module is most likely to be faulty 11SLPB or no standby power. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is cut off in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If the LG 42LV4500 does not have an image, but there is sound, a malfunction of the backlight LEDs of the LC420EUF (SD) (A1) panel or their power converter, the LED driver, may occur.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
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.
Repair of the EAX64290501 (0) motherboard should 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.
In some cases, they require checking or replacing (if necessary) the elements of the MB board (SSB) - LGE107DC-R-T8, 25L8006E, 24C08WI. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner TDTJ-S001D EBL60721201 and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to repair the LG 42LV4500 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!
SCHEMATIC DIAGRAM ----------> LG CHASSIS LT01U; MODEL: 42LV4500, 42LV4500-DA
The appearance of the MainBoard EAX64290501 is shown in the figure below:EAX64290501
EAX64290501 can be used in TVs:
LG 32LV2500-ZA (Panel T315XW06 V.3), LG 37LV3500-ZA (Panel T370HW05 V.1), LG 42LV3400-ZA (Panel T420HW08 V.1), LG 32LK530 (Panel LC320WUD (SC)(A3)), LG 37LK430 (Panel LC370WUE), LG 32LK451 ZA (Panel T315HW04 V.9), LG 42LV3551 (Panel LC420EUN (SD) (V3)), LG 47LW4500 (Panel LC470EUF (SD)(F2)), LG 32LK551 ZB (Panel LC320WUD (SC)(A2)), LG 42LV3500 (Panel LC420EUN (SD)(V3)), LG 42LK551 ZB (Panel V420H2-LH5), LG 42LK451 42LK451-ZG.BRUYLJU (Panel T420HW09 V0), LG 42LK530 (Panel LC420WUF (SC)(A2)), LG 47LK950 ZA (Panel LC470WUF (SD)(P1)), LG 32LW4500 ZB (Panel LC320EUD (SD)(P1)), LG 42LW4500 ZB (Panel LC420EUF (SD)(PX)), LG 42LV4500 DA (Panel LC420EUF (SD)(A1)), LG 32LV4500 (Panel LC320EUD (SD)(A4)), LG 42LV369C (Panel T420HW08 V.9).
PSU Advanced
The 42LV4500 model uses the EAX62865401 / 8 LGP4247-11SLPB power supply unit using the PFC (Power Factor Correction) node - an active filter of higher harmonics of the current consumption. In fact, this is a boost converter based on the FAN7930B PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the device LG 42LV4500:
Installed matrix (LED-panel) LC420EUF (SD) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0358A.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 42LV4500 TV are generated by the EAX62865401 power module or its analogs using FAN7930B (PFC), 3BR4765JZ (Standby), L6599AD (PWM Resonant) microcircuits.
MainBoard - the main board (motherboard) is an EAX64290501 module, with the use of LGE107DC-R-T8, 25L8006E, 24C08WI chips and others.
Tuner TDTJ-S001D EBL60721201 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC420EUF-SDA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1600: 1
Display Colors: 1.06B (8-bit + FRC), CIE1931 72%
Response Time: 5 (G to G); 8 (MPRT)
Frequency: 120Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (4 ch, 10-bit), 92 pins
Voltage: 12.0V