Technical description and composition of the LG 47LA615V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 47LA615V
Panel: LC470DUE (SF) (U2)
LED backlight: 6916L-1261a (L1), 6916L-1262a (L2); 6916L-1260a (R2), 6916L-1259a (R1), 6637L-0024a
T-CON: 6870C-0444A, LC470DUE-SFR1
LED driver (backlight): integrated into PSU; 93.2 ~ 118.5V 0.4A
PWM LED driver: BD9483F
MOSFET LED driver: MDD7N25, FDT86106
Power Supply (PSU): EAX64905501 (2.2) - LGP4750-13PL2 EAY62810801
PWM Power: SSC9527S (PWM Resonant), R2A20133D (PFC), ICE3BR4765JZ (Standby)
MOSFET Power: 13NM60N
MainBoard: EAX64891306 - EBR76922721
IC MainBoard: CPU: LGE2121-MC, DRAM: H5TQ2G63DFR, Flash: MX25L8006E, AUDIO: STA380BWF
Tuner: EBL61240503 TDSQ-G601D
Control: IR EBR77031901, RSD7CG000P, MC28A, 1BF-3032A, LA6200 IR Ver1.2
Specifications 47LA615V
LG 47LA615V
General repair guidelines for TV LCD LED
Failures of the EAX64905501 (2.2) - LGP4750-13PL2 power supply module can be expressed in different ways, for example, LG 47LA615V does not turn on at all and the control lamps on its front panel do not light up and do not blink, and there are no signs of operability. 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.
If the power keys of the pulse converter are not equal, you should pay attention to other elements in their bundling, which may be the result or cause of their breakdown.
If the LG 47LA615V does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the backlight circuits of the LC470DUE (SF) (U2) panel is likely. LEDs or their power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the backlight assembly.
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.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
The motherboard EAX64891306 - EBR76922721 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
When repairing an MB board, you need to check its CPU components: LGE2121-MC, DRAM: H5TQ2G63DFR, Flash: MX25L8006E, AUDIO: STA380BWF. Defective items should be replaced. If BGA chips are installed, their malfunction is usually localized by heating.
Before replacing the tuner EBL61240503 TDSQ-G601D, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention! For users and owners of 47LA615V TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against self-repair attempts in order to avoid negative consequences that could lead to complete non-repairability of the device.
You can reduce the backlight current in TVs with LGP4750-13PL2 power supplies (EAX64905501) as follows. Current sensors in the R811-R818 LEDs - channel 1 and R829-R836 - channel 2. Resistors in the channels in pairs of 4.3 + 3.9 Ohm. You can reduce the backlight current by 25% by removing one pair of resistors in each channel.
schematic diagram --------------> LGP4750-13PL2 EAX64905501 EAY62810801 power supply.
The appearance of the MainBoard EAX64891306 is shown in the figure below:EAX64891306
EAX64891306 can be used in TVs:
LG 32LN540V (Panel LC320DUE (SF)(R1)), LG 42LN542V-ZD (Panel LC420DUE SFR3), LG 32LN541V (Panel LC320DUE (SF)(R1)), LG 42LA615V (Panel LC420DUE (SF)(U2) ), LG 32LA615V (Panel LC320DUE (SF)(U2)), LG 42LN540V (Panel LC420DUE (SF)(R1)), LG 42LN541V (Panel LC420DUE (SF)(R1)), LG 47LN540V (Panel LC470DUE (SF)(R1)), LG 32LB530U ZA (Panel LC320DXE (SG)(R1)), LG 39LN540V (Panel HC390DUN-VCFP1-11XX), LG 32LA643V (Panel LC320EUN (SF)(F1)), LG 32LN542V (Panel LC320DUE SF R1), LG 47LA615V (Panel LC470DUE (SF)(U2)), LG 47LA643V ZB (Panel LC470EUN (SF)(F2)), LG 32LN541U ZB (Panel HC320DXN-VHFP1 - 21XX / HC320DXN-VHFPA - 21XX), LG 32LN536U (Panel NC320DXN (SA)(P1)), LG 37LN541U (Panel LC370DXE (SF)(R1)).
PSU Advanced
The EAX64905501 power module is designed using a Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC node is a Step-Up Converter based on the R2A20133D PWM controller, which evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device LG 47LA615V:
Installed matrix (LED-panel) LC470DUE (SF) (U2).
The matrix control uses the Timing Controller (T-CON) 6870C-0444A.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the BD9483F PWM controller. As power elements of the LED driver, keys of the type MDD7N25, FDT86106 are used.
The necessary supply voltages for all nodes of the LG 47LA615V TV are generated by the EAX64905501 power supply module or its analogs using SSC9527S (PWM Resonant), R2A20133D (PFC), ICE3BR4765JZ (Standby) microcircuits, and 13NM60N power switches.
MainBoard - the main board (motherboard) is an EAX64891306 module using CPU chips: LGE2121-MC, DRAM: H5TQ2G63DFR, Flash: MX25L8006E, AUDIO: STA380BWF and others.
The tuner EBL61240503 TDSQ-G601D provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC470DUE-SFU2
Type: a-Si TFT-LCD, Panel
Diagonal size: 47 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 1039.68x584.82 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 300 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 9 (G to G) (B / W)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V