Technical description and composition of the LG 47LM761T TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 47LM761T ZA
Chassis / Version: LD22E
Panel: LC470EUH (PE) (F1
LED backlight: 7030 6922L-0021A
T-CON: 6870C-0452A
LED driver (backlight): integrated into PSU; 58.5V 1.26A
PWM LED driver: R5F100BCAFP, AAT2430AISX
MOSFET LED driver: PHT4Q10LT x 8
Power Supply (PSU): EAX64744101 (EAY62512702) PLDF-L101B - LGP4247H-12LPB-3P
PWM Power: STR-A6059 (Standby), L6599D, HS01G (PFC)
MOSFET Power: K10A60D, 13NM60V
MainBoard: EAX64307906 EBR75226861
IC MainBoard: CPU: LGE2112 1215-BTAH, NAND: KLM2G1HE3F-B001, Sound: STA380BWE, EEPROM: AT24C256C
Tuner: TDSN-G351D EBL61080002
Specifications 47LM761T
LG 47LM761T
General repair guidelines for TV LCD LED
In cases where the LG 47LM761T TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the EAX64744101 EAY62512702 PLDF-L101B power supply module is most likely to be faulty 3PAGC10088A-R or standby power is missing. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes and K10A60D, 13NM60V transistors in the primary circuit.
The reasons for the breakdown of the power switch in switching power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip STR-A6059 (Standby), L6599D, HS01G ( PFC) or breakage of resistors in its harness.
In cases where the LG 47LM761T TV has lost its image and the sound is there and all other functions are operational, there is a possibility of a malfunction of the LED driver (converter for powering the backlight of the LC470EUH (PE) panel (F1). When the TV is turned on, the image may appear briefly and It must be borne in mind that with such manifestations the LEDs themselves also fail.
The lack of backlight often occurs due to an open circuit in the LED circuit. There is a need for disassembling the panel and checking the LEDs themselves, as well as the same contact connections in the connectors and rations of the terminals.
Without a special current source, it is impossible to check the line of series-connected LEDs, and for this purpose it is not safe to use any voltage sources above 12V. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
On the EAX64307906 EBR75226861 motherboard, in the event of a malfunction, you should first check the operation of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software).
In some cases, it is necessary to check or replace (if necessary) the elements of the MB board (SSB) - CPU: LGE2112 1215-BTAH, NAND: KLM2G1HE3F-B001, Sound: STA380BWE, EEPROM: AT24C256C. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the TDSN-G351D EBL61080002 tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Attention to users! Self-repair of the LG 47LM761T TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram ----------------> LG LD22E; Model: 47LM760S , 47LM760T , 47LM760S-ZB, 47LM760T-ZB, 47LM761S , 47LM761T , 47LM761S-ZA, 47LM7761T-ZA, 47LM765S, 47LM765T, 47LM765S-ZD, 47LM765T-ZD.
psu schematic diagram ----------------> LGP4247H-12LPB-3P EAY62512702 EAX64744101 PLDF-L101B
To reduce the backlight current in LED drivers with the AAT2430AISX controller, increase the resistance of the resistor from terminal 50 (ISET) to the housing, for example, from 3 KOhm to 4.7 KOhm. Currents will proportionally decrease in each of the 16 channels. With a parallel connection of channels, currents are summed.
The appearance of the MainBoard EAX64307906 is shown in the figure below:EAX64307906
EAX64307906 can be used in TVs:
LG 32LM640T ZA (Panel LC320EUA PE F2), LG 32LS570T (Panel LC320EUN (SE)(M2)), LG 47LM620S (Panel LC470EUE (SE)(F4)), LG 42LM670T (Panel LC420EUG(PE)(F2)), LG 42LM640T 42LM640S (Panel LC420EUG (PE)(F1)), LG 42LM620T (Panel LC420EUE (SE)(F1)), LG 47LM660T (Panel LC470EUG (PE)(F1)), LG 42LS570T (Panel T420HVN01.0), LG 42LS570S ZB (Panel LC420EUE (SE)(M1)), LG 42LM669T (Panel LC420EUG (PE)(F2)), LG 42LM669S (Panel LC420EUG (PE)(F1)), LG 37LM620T (Panel LC370EUN (SE)(F2)), LG 47LM669 (Panel LC470EUG (PE)(F2)), LG 32LS570S ZB (Panel LC320EUN (SE)(M2)), LG 47LM620T (Panel LC470EUE (SE)(F3)), LG 47LM761T ZA (Panel LC470EUH (PE)(F1), LG 32LM620S (Panel LC320EUN (SE)(F2) ), LG 47LM670T 47LM670T-ZA.BRUWLJU (Panel LC470EUG (PE)(F1)), LG 42LM660S 42LM660S-ZA.BRUWLJU (Panel LC420EUG (PE)(F1)), LG 42LM660T 42LM660T-ZA.BRUWLJU (Panel LC420EUG (PE)(F1) ), LG 32LM620T (Panel LC320EUN (SE)(F3)), LG 55LM620T 55LM620T-ZE (Panel LC550EUE (SE)(F1)).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the EAX64744101 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the HS01G PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device LG 47LM761T:
Installed matrix (LED-panel) LC470EUH (PE) (F1.
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 unit, controlled by a PWM controller R5F100BCAFP, AAT2430AISX. As the power elements of the LED driver, keys of the type PHT4Q10LT x 8 are used.
The necessary supply voltages for all nodes of the LG 47LM761T TV are generated by the EAX64744101 power module, or its analogs, using STR-A6059 (Standby), L6599D, HS01G (PFC) microcircuits and power switches of the K10A60D, 13NM60V type.
MainBoard - the main board (motherboard) is an EAX64307906 module using CPU chips: LGE2112 1215-BTAH, NAND: KLM2G1HE3F-B001, Sound: STA380BWE, EEPROM: AT24C256C and others.
The TDSN-G351D EBL61080002 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC470EUH-PEF1
Type: a-Si TFT-LCD, Panel
Diagonal size: 47 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 1039.68x584.82 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 400 cd / m²
Contrast Ratio: 1600: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8/10 (Tr / Td)
Frequency: 120Hz
Lamp Type: WLED Without Driver
Signal Interface: EPI, 100 pins
Voltage: 12.0V
