Technical description and composition of the LG 47LK460 TV, panel type and applicable modules. The composition of the modules.LG
Model: 47LK460 CC
Chassis / Version: LP91U
Panel: LC470WUE
T-CON: 32/47 V5 6870C-0318B Ver0.7; Tl2428MC, 01TLL-0048A
Inverter (backlight): integrated into PSU
PWM Inverter: BD9270F
MOSFET Inverter: 2SK3868
Trans Inverter: LIF47-100L NYB-003
Power Supply (PSU): EAX61289601 / 13 LGP47-10LF
PWM Power: STR-W6053N, R2A20112 (PFC 16pin)
MOSFET Power: 13NM60N
MainBoard: EAX64049202 (1)
IC MainBoard: LGE4767A-LF-SB, AN4K838D, X415116301-HCF7, NTP-7100, DI2502AE
Tuner: TAFJ-Z001D (P)
Control: AKB72915211
Appearance
LG 47LK460
General recommendations for repairing TV LCD
Diagnostics of malfunctions and repairs LG 47LK460 CC, as well as other electronic devices, it is recommended to start with an external examination of the external and internal elements. Often, based on certain external signs, it may be possible to draw certain conclusions about the reasons for the failure of certain elements of the circuit even before the necessary measurements are made, which will determine the further algorithm for troubleshooting and localizing the defect. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
In cases where the LG 47LK460 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 EAX61289601 / 13 power supply module is most likely malfunctioning or missing standby power. Diagnostics and repair of the common power supply should always begin with a check of 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 STR-W6053N, R2A20112 (PFC) can also cause a breakdown of the power switch of the converter.
If when you turn on the LG 47LK460 there is no image, or it appears for a second and disappears completely, but there is sound, most likely either the backlight or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit. When disabling protection in order to enable the diagnosis of a malfunction, special care should be taken, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements LGE4767A-LF-SB, AN4K838D, X415116301-HCF7, NTP-7100, DI2502AE. BGA chip malfunctions are usually easy to detect by warming up.
If the TV works normally from external devices, but does not tune into television channels, the TAFJ-Z001D (P) 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.
Attention! For users and owners of 47LK460 TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
Service manual and schematic diagram -----------> LG CHASSIS :LP91U; Model: 37LK460-CC, 42LK460-CC, 47LK460-CC, 19LD320N-ZA.
The appearance of the MainBoard EAX64049202 is shown in the figure below:EAX64049202
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the EAX61289601 / 13 LGP47-10LF module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the R2A20112 16pin 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 47LK460:
Installed matrix (LCD panel) LC470WUE.
The matrix control uses the Timing Controller (T-CON) 32.
To power the backlight, a converter is used, combined with the power supply, controlled by the BD9270F PWM controller. The transformer LIF47-100L NYB-003 is installed in the inverter converter. As power elements of the inverter, keys of the 2SK3868 type are used.
The necessary supply voltages for all nodes of the LG 47LK460 TV are generated by the EAX61289601 power module or its analogs using STR-W6053N, R2A20112 (PFC 16pin) microcircuits and 13NM60N power switches.
MainBoard - the main board (motherboard) is an EAX64049202 module, using LGE4767A-LF-SB, AN4K838D, X415116301-HCF7, NTP-7100, DI2502AE and other chips.
Tuner TAFJ-Z001D (P) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC470WUE-SAA1
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 13%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M / 1.07B (8-bit / 8-bit + Dithering)
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: 22 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8/10-bit), 51 pins
Voltage: 12.0V