Technical description and composition of the LG 42LA669V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LA669V 42LA669V-ZE.BRUZLJU
Chassis / Version: LD33B
Panel: LC420EUH (PF) (P1)
LED backlight: 6920L-0001C, 6916L1182B, 6916L1183B, 6922L-0072A
LED driver (backlight): integrated into PSU; 67.2V, 0.9A
PWM LED driver: R5F100BCAFP, IW7011
MOSFET LED driver: R5F100BCAFP, IW7011
Power Supply (PSU): EAX64905701 (2.6) LGP4247-13LPB EAY62810901
PWM Power: R2A20133D (PFC), ICE3BR4765JZ (Standby)
MOSFET Power: 13NM60N, 10NM60N
MainBoard: EAX64797004 (1.1)
IC MainBoard: LGE2122 1402-BTAN, NAND: 3DAI8 JW857, H5TQ4G63AFR
Tuner: TDSQ-G601D (B)
Control: AKB73715601 & Magic Motion, WIFI: TWFM-B006D
Specifications 42LA669V
LG 42LA669V
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 42LA669V 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, a malfunction is most likely to be detected in the EAX64905701 power module. It is necessary to measure its output voltages and, if they are absent, check the power switches (13NM60N, 10NM60N) and rectifier diodes for the probability of short circuit in the converters.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key 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 circuits (PWM) R2A20133D (PFC), ICE3BR4765JZ (Standby) are usually checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction 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 EAX64797004 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 cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - LGE2122 1402-BTAN, NAND: 3DAI8 JW857, H5TQ4G63AFR which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
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 power supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Attention TV owners! Attempts at self-repair of LG 42LA669V are not recommended by the manufacturer and can lead to serious negative consequences!
Schematic diagram ------------> LG MODEL: 42LA660, 42LA660S, 42LA660V, 42LA662V, 42LA667V 42LA669V (CHASSIS LD33B) SERVICE MANUAL.
Schematic diagram PSU ------------> LGP4247-13LPB
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 42LA669V:
Installed matrix (LED-panel) LC420EUH (PF) (P1).
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by a PWM controller R5F100BCAFP, IW7011. As the power elements of the LED driver, keys of the type R5F100BCAFP, IW7011 are used.
The necessary supply voltages for all nodes of the LG 42LA669V TV are generated by the EAX64905701 power supply module or its analogs using R2A20133D (PFC), ICE3BR4765JZ (Standby) microchips and power switches of the 13NM60N, 10NM60N type.
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: LC420EUH-PFP1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 927.94x521.96 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 400 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 68%
Response Time: 8/10 (Tr / Td)
Frequency: 120Hz
Lamp Type: WLED Without Driver
Signal Interface: EPI, 100 pins
Voltage: 12.0V