Technical description and composition of the LG 42LM669S TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LM669S
Chassis / Version: LD22E
Panel: LC420EUG (PE) (F1)
LED backlight: 6922L-0023A 401 (Cool); LED: 42 ART TV REV 0.3 2 L-Type 6920L-0001C 6916L0948A; 42 ART TV REV 0.3 2 R-Type 6920L-0001C 6916L0947A
LED driver (backlight): integrated into PSU; 67.2V, 0.78A
PWM LED driver: UC2843BD1 (Step-Up LED), AAT2430AISX, R5F100BCAFP
MOSFET LED driver: STF19NF20, PHT4NQ10LT * 6
Power Supply (PSU): EAX64744201 (1.3) - EAY62608902, LGP4247L-12LPB-3P
PWM Power: L6599AD (PWM Resonant), FAN7930BG (PFC), STR-A6059H (Standby)
MOSFET Power: STF13NM60N * 2, STF10NM60N * 2
MainBoard: EAX64307906 (1.0) - EBR75226821, SAA35926628, SAA35948924
IC MainBoard: LCE2112 ic701-ic704 -H5TQ2G63DFR ic8100 - KLM2G1HE3F ic3000 - MICOM R5F100GEA ic7700 - TPS65178 ic5800 - STA3808WE ic100-24c16
Tuner: TDSN-G351D EBL61080002
Control: radio remote control AN-MR3005; IR LM66_76_96 Ver1.6; Wi-Fi: TWFM-B003D, EAT61613401; Bluetooth: EBR74561201, IA5525-00, BM-LDS302, 011WWA110040
Specifications 42LM669S
LG 42LM669S
General repair guidelines for TV LCD LED
If the power supply module EAX64744201 (1.3) is malfunctioning - EAY62608902, LGP4247L-12LPB-3P, the external manifestations may be different, for example, LG 42LM669S does not turn on at all and there is no indication of indicator lights on the front panel. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken 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.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the PWM controller chip are subject to verification, which it is desirable to verify by replacement.
If the LG 42LM669S has no image, but there is sound, there may be a malfunction of the backlight LEDs of the LC420EUG (PE) (F1) panel or their power converter - LED driver.
Often there is a need for disassembling the panel to check the health of the LEDs, as well as contact connections in the connectors and soldering.
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 motherboard EAX64307906 (1.0) - EBR75226821, SAA35926628, SAA35948924 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.
Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements LCE2112 ic701-ic704 -H5TQ2G63DFR ic8100 - KLM2G1HE3F ic3000 - MICOM R5F100GEA ic7700 - TPS65178 ic5800 - STA3808WE ic100-24c16 requires the necessary training and professional skills for repairing modules at the component level. Problems associated with the use of BGA soldering technologies can be diagnosed by warming up.
If the TV works normally from external devices, but does not tune into television channels, the TDSN-G351D EBL61080002 tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
We recommend the owners of the 42LM669S TV for repair only to qualified specialists with experience! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
SCHEMATIC DIAGRAM ----------> LG CHASSIS LD22E; MODEL 42LM660S, 42LM660T, 42LM669S, 42LM669T, 42LM660S/660T-ZA 42LM669S/669T-ZC.
PSU SCHEMATIC DIAGRAM ----------> LGP4247L-12LPB-3P - EAY62608902 - PLDF-L103B - EAX64744201 (1.3 - 1.5).
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 EAX64744201 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the FAN7930BG 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 42LM669S:
Installed matrix (LED-panel) LC420EUG (PE) (F1).
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by a PWM controller UC2843BD1 (Step-Up LED), AAT2430AISX, R5F100BCAFP. As power elements of the LED driver, keys of the type STF19NF20, PHT4NQ10LT * 6 are used.
The necessary supply voltages for all nodes of the LG 42LM669S TV are generated by the EAX64744201 power supply module or its analogs using L6599AD (PWM Resonant), FAN7930BG (PFC), STR-A6059H (Standby) microcircuits and power switches of the STF13NM60N * 2, STF10NM60N * 2 type.
MainBoard - the main board (motherboard) is an EAX64307906 module, using LCE2112 ic701-ic704-H5TQ2G63DFR ic8100 - KLM2G1HE3F ic3000 - MICOM R5F100GEA ic7700 - TPS65178 ic5800 - STA3808W16- ic100 chips.
The TDSN-G351D EBL61080002 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC420EUG-PEF1
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 1%), Hard coating (2H)
Brightness: 360 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 8/10 (Tr / Td)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: EPI, 100 pins
Voltage: 12.0V