Technical description and composition of the LG 47LK950 TV, panel type and applicable modules. The composition of the modules.LG
Model: 47LK950 ZA
Chassis / Version: LD01U
Panel: LC470WUF (SD) (P1)
T-CON: 6870C-0312B
Inverter (backlight): integrated into PSU
PWM Inverter: BD9270F
MOSFET Inverter: 2SK3868
Trans Inverter: EBJ60711214 - LIF47-100L
Power Supply (PSU): EAX61289601 / 13 - LGP47-10LF
PWM Power: STR-W6053N, R2A20112 (PFC 16pin)
MOSFET Power: 13NM60N
MainBoard: EAX64290501 (0)
IC MainBoard: H27U1G8F2BTR (SAA35388621 Ver.4.60.24), H5TQ1G63DFR, 25Q80BVSIG, 25X20BVNIG, ATMLH122, 24C08WI, 24C16WP, 24H01RP, MAX3232C, F0514A, NTP7100
Tuner: TDTJ-S001D EBL60721201
Specifications 47LK950
LG 47LK950
General recommendations for repairing TV LCD
Repair of the LG 47LK950 ZA TV should begin with a careful external examination of all its components and modules. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. If charred resistors, swollen electrolytic or cermet capacitors, ring cracks in the soldered terminals of transformers or heating elements are detected, it is advisable to establish the causes and consequences of the malfunction that has arisen, as well as to check the connected elements and assemblies.
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain chance that the EAX61289601 / 13 power supply module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of standby power. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of the 13NM60N transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
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.
Sometimes the LG 47LK950 TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit). If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
The EAX64290501 (0) motherboard 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. In some cases, it is necessary to check or replace (if necessary) the elements of the MainBoard board - H27U1G8F2BTR (SAA35388621 Ver.4.60.24), H5TQ1G63DFR, 25Q80BVSIG, 25X20BVNIG, ATMLH122, 24C08WI, 24C16WP, 24H01RP, MAX3232, MAX3232. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Before changing the TDTJ-S001D EBL60721201 tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
For 47LK950 TV owners, we recommend that you contact qualified professionals with work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
Service manual and schematic diagram ---------------> LG 47LK950 Chassis LD01U.
CHASSIS : LD01U; MODEL : 47LK950, 47LK950A, 47LK950N, 47LK950U, 47LK950, 47LK950A, 47LK950N, 47LK950U-ZC
The appearance of the MainBoard EAX64290501 is shown in the figure below:EAX64290501
EAX64290501 can be used in TVs:
LG 32LV2500-ZA (Panel T315XW06 V.3), LG 37LV3500-ZA (Panel T370HW05 V.1), LG 42LV3400-ZA (Panel T420HW08 V.1), LG 32LK530 (Panel LC320WUD (SC)(A3)), LG 37LK430 (Panel LC370WUE), LG 32LK451 ZA (Panel T315HW04 V.9), LG 42LV3551 (Panel LC420EUN (SD) (V3)), LG 47LW4500 (Panel LC470EUF (SD)(F2)), LG 32LK551 ZB (Panel LC320WUD (SC)(A2)), LG 42LV3500 (Panel LC420EUN (SD)(V3)), LG 42LK551 ZB (Panel V420H2-LH5), LG 42LK451 42LK451-ZG.BRUYLJU (Panel T420HW09 V0), LG 42LK530 (Panel LC420WUF (SC)(A2)), LG 47LK950 ZA (Panel LC470WUF (SD)(P1)), LG 32LW4500 ZB (Panel LC320EUD (SD)(P1)), LG 42LW4500 ZB (Panel LC420EUF (SD)(PX)), LG 42LV4500 DA (Panel LC420EUF (SD)(A1)), LG 32LV4500 (Panel LC320EUD (SD)(A4)), LG 42LV369C (Panel T420HW08 V.9).
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 PWM controller elements. 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 47LK950:
Installed matrix (LCD panel) LC470WUF (SD) (P1).
The matrix control uses the Timing Controller (T-CON) 6870C-0312B.
To power the backlight, a converter is used, combined with a power supply, controlled by a BD9270F PWM controller. The transformer EBJ60711214 - LIF47-100L 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 47LK950 TV are generated by the EAX61289601 power supply module or its analogs using STR-W6053N, R2A20112 (PFC 16pin) microcircuits and 13NM60N power switches.
MainBoard - the main board (motherboard) is an EAX64290501 module, using the H27U1G8F2BTR chips (SAA35388621 Ver.4.60.24), H5TQ1G63DFR, 25Q80BVSIG, 25X20BVNIG, ATMLH122, 24C08WI, 24C16P14 MAX, 24C16P14 MAX, 24C16P14, MAX.
The TDTJ-S001D EBL60721201 tuner provides TV reception and channel tuning.