Technical description and composition of the LG 47LH5000 TV, panel type and applicable modules. The composition of the modules.LG
Model: 47LH5000 ZB
Chassis / Version: LD91B
Panel: LC470WUF (SB) (M1)
Inverter (backlight): integrated into PSU; 1350V 78mA
Power Supply (PSU): EAY57681901 PLHC-T840A 2300KPG108A-F
PWM Power: PFC + STR + CCFL-Driver
MainBoard: EAX57644502 (5) EBU60674812
IC MainBoard: LGE7329A-LF, M24512, W25X32VSSIG, MAX3232C, HY5PS1G1631CFP, NTP-3100L
Tuner: EBL60658001 TDFW-G235D
Specifications 47LH5000
LG 47LH5000
General recommendations for repairing TV LCD
Repair of electronic equipment usually begins with its external inspection and diagnosis of the malfunction. In this case, you should examine all the internal components of the LG 47LH5000 ZB TV, as well as the external elements of the housing. 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. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a significant clue in the assumptions about the causes and consequences of the malfunction.
If the LG 47LH5000 does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the EAY57681901 PLHC-T840A 2300KPG108A-F power supply module. In some cases, only the processor power regulator may be faulty. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
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 PFC, STR, and CCFL-Driver PWM controller circuits are subject to verification, which can be checked by replacement.
If the LG 47LH5000 TV does not have an image, but there is sound, make sure that the backlight power converter (inverter) is working properly. It is also necessary to check the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for excessive ESR. All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
Repair or diagnostics of the EAX57644502 (5) EBU60674812 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - LGE7329A-LF, M24512, W25X32VSSIG, MAX3232C, HY5PS1G1631CFP, NTP-3100L and replace the failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If there is no reception of television channels, but the TV works properly from external devices, first of all you need to check the voltage of the tuner EBL60658001 TDFW-G235D and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention! Users and owners of 47LH5000 TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from 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: LD91B; MODEL: 55LH5000, 55LH5000-ZB
The appearance of the MainBoard EAX57644502 is shown in the figure below:
EAX57644502
EAX57644502 can be used in TVs:
LG 37LH5000 (Panel LC370WUD (SB)(M1)), LG 47LH5000 ZB (Panel LC470WUF (SB)(M1)), LG 42LH5000 42LH5000-ZB.BRUVLJU (Panel LC420WUF (SB)(M1)).
PSU Advanced
The 47LH5000 model uses an EAY57681901 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the PWM controller + STR + CCFL-Driver, which eliminates the charge current of the electrolytic capacitor of the rectifier filter 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 47LH5000:
Installed matrix (LCD panel) LC470WUF (SB) (M1).
To power the backlight, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 47LH5000 TV are generated by the EAY57681901 power module, or its analogs using PFC + STR + CCFL-Driver microcircuits.
MainBoard - the main board (motherboard) is an EAX57644502 module, using chips LGE7329A-LF, M24512, W25X32VSSIG, MAX3232C, HY5PS1G1631CFP, NTP-3100L and others.
The tuner EBL60658001 TDFW-G235D provides the reception of television programs and tuning to channels.