Technical description and composition of the LG 47LM660T TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 47LM660T
Chassis / Version: LD22E
Panel: LC470EUG (PE) (F1)
LED backlight: 6920L-0001C (6916L0890A)
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 - EAY62608902, LGP4247L-12LPB-3P
PWM Power: L6599AD (PWM Resonant), FAN7930BG (PFC), STR-A6059H (Standby)
MOSFET Power: STF13NM60N * 2, STF10NM60N * 2
MainBoard: EAX64307906 (1.0)
IC MainBoard: LCE2112 ic701-ic704 -H5TQ2G63DFR ic8100 - KLM2G1HE3F ic3000 - MICOM R5F100GEA ic7700 - TPS65178 ic5800 - STA3808WE ic100-24c16
Tuner: TDSN-G351D
Control: AKB73615303; Wi-Fi Module TWFM-B003D, EAT61613401, BEJTWFMB003D; Bluetooth BM-LDS302, EBR74561201
Specifications 47LM660T
LG 47LM660T
General repair guidelines for TV LCD LED
Repair of electronic devices, including the LG 47LM660T TV, it is advisable to start with an external examination of its external and internal elements. In some cases, visible external damage to the elements can suggest the direction of troubleshooting and localization of the defect even before the start of the necessary measurements at the control points of the nodes of electronic circuits. In most cases, the repairman can guess the causes of the defect and possible consequences from the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of the element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
In the case when the 47LM660T does not turn on, does not respond to the remote control and buttons on the front panel, does not blink lights and does not show any signs of operability, the power supply module is probably defective in this case. If it is serviceable with such manifestations, it is necessary to check the stabilizer (converter) of the processor power supply on the motherboard. Diagnostics and repair of the general power supply unit should always begin by checking the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
Mos-Fet keys used in switching power supplies (SMPS) rarely fail for no reason to look for when checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
If the LG 47LM660T has no image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the LC470EUG panel, or their power converter - LED driver. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the LED driver itself, including in the secondary rectifier of the main PSU.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the rations of their terminals, as well as the reliability of the connections in the connectors and rations of the terminals.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source.
Diagnosis and repair of the motherboard EAX64307906 (1.0) is carried out by checking the performance of the stabilizers or power converters of the module chips. In some cases, a software update is required.
Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements LCE2112 ic701-ic704 -H5TQ2G63DFR ic8100 - KLM2G1HE3F ic3000 - MICOM R5F100GEA ic7700 - TPS65178 ic5800 - STA3808WE ic100-24c16. BGA chip malfunctions are usually easy to detect by warming up.
Before replacing the TDSN-G351D tuner, if there is no tuning to the channels, you must first check the supply voltage at its terminals.
Owners of the 47LM660T TV are recommended to contact qualified professionals with experience for repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
Service manual / schematic diagram ----------------> LG CHASSIS: LD22E; 47LM660S/660T/669S/669T, 47LM660S/660T-ZA, 47LM669S/669T-ZC SERVICE MANUAL
Panel backlight - Led cool: 6922L-0021A;
Led left: 1226 47 APTTV Rev0.6 2 L-Type 6920L-0001C, 6916L0890A;
Led right: 1226 47 APTTV Rev0.6 2 R-Type 6920L-0001C, 6916L0891A.
psu schematic diagram ----------------> LGP4247L-12LPB-3P - EAY62608902 - PLDF-L103B - EAX64744201 (1.3 - 1.5).
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
The 47LM660T model uses the EAX64744201 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, this is a boost converter based on the FAN7930BG PWM controller, which eliminates the charge current of the rectifier filter's electrolytic capacitor 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 47LM660T:
Installed matrix (LED-panel) LC470EUG (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 47LM660T TV are generated by the EAX64744201 power supply module or its analogs using L6599AD (PWM Resonant), FAN7930BG (PFC), STR-A6059H (Standby) microchips 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 tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC470EUG-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: 360 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 1.06B (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
