Technical description and composition of the LG 42LD420 TV, panel type and applicable modules. The composition of the modules.LG
Model: 42LD420 ZA
Chassis / Version: LD01B
Panel: LC420WUG (SC) (A1)
Inverter (backlight): integrated into PSU
PWM Inverter: BD9270F
Power Supply (PSU): EAX61124202 / 2 - 3PAGC10011B-R
PWM Power: STR-W6053N, HS01G (PFC)
MOSFET Power: 10NM60N
MainBoard: EAX61354204 (0)
IC MainBoard: CPU: LGE107DC-RP, DDR: H5TQ1G63BFR-H9C, Nand: HY27UF082G2B, SPI FLASH MX25L8005M2I
Tuner: TDTJ-S001D
Control: Remote: AKB72915207
Specifications 42LD420
LG 42LD420
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 42LD420 ZA TV, as well as the external elements of the housing. A visible physical change in some components can sometimes suggest a further troubleshooting direction. Electrolytic capacitors of filters with a swollen casing, as well as ring cracks formed in the soldered leads of heating elements, or a layer of coal on burnt resistors sometimes tell the repairman the causes of the malfunction and possible consequences.
If the EAX61124202 / 2 - 3PAGC10011B-R power supply module fails, the external manifestations may be different, for example, LG 42LD420 does not turn on at all and there is no indication of the indicator lights on the front panel. 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 cut off, then it is necessary to check the diodes of the rectifier bridge and the key transistor of the converter for a breakdown of the PN junctions, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
A breakdown of the power switch of the pulse converter is often triggered by other elements, for example, in the stabilization or control circuits of this switch, as well as by the damper elements in its drain and TPI winding.
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when turned on, but there are sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter feeding the inverter should be checked. It should be remembered that when protection is disabled in order to diagnose a malfunction, there is always a risk of failure of the power elements of the inverter. After repair, it is necessary to restore all standard converter protection circuits.
If the EAX61354204 (0) motherboard is faulty, first of all it is necessary to check all the linear stabilizers and power converters of its chips, and also, if necessary, update the software (software). Sometimes you can check the health of MB only by replacement. Often, the MB (SSB) card needs to be replaced in case of complex faults that are difficult to detect. When trying to repair, you should check its elements - CPU: LGE107DC-RP, DDR: H5TQ1G63BFR-H9C, Nand: HY27UF082G2B, SPI FLASH MX25L8005M2I and replace 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 is working properly from external devices, first of all you need to check the power supply of the TDTJ-S001D tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
MAIN Composition: EAX61354204 (0)
Processor: (sticker SAA34907916 V 3.5.4.), IC102: H27U1G8F2BTR (sticker SAA34420179 V 3.1.10), IC103: 24C08WI, IC501: NTP-7000 D0262AA, IC600: TP5 62110, IC601: MAX9668E, IC603: MAX172, IC603: MAX178 F0513A, IC1201, IC1202: H5TQ1G63BFR, IC104: 24HO1RP, IC401: MP8706EN, IC602: MAX17119E, IC801, IC1105: ATMLH004-02B 1, IC804: ATMLH004-02D 1, IC902: LCX244, IC141011001, IC902, IC324011, 1011, 1011 MX25L8005, IC1601: LM324DG
schematic diagram ------------> LG CHASSIS LD01B; MODEL: 42LD450, 42LD450-ZA, 42LD450N, 42LD450N-ZA, 42LD458, 42LD458-ZA
The appearance of the MainBoard EAX61354204 is shown in the figure below:EAX61354204
EAX61354204 can be used in TVs:
LG 32LD345 (Panel LC320WXE-SCA1), LG 37LD450 (Panel LC370WUG (SC)(A1)), LG 42LD455-ZA (Panel LC420WUG), LG 32LD550 (Panel LK315D3LA57), LG 42LD450 ZA (Panel LC420WUG (SC)(A1)), LG LG32LD350 32LD350 (Panel T315HW04 V.8), LG 42LD420 ZA (Panel LC420WUG (SC)(A1)), LG 37LD420 ZA (Panel T370HW03 V.B), LG 32LD420 ZA (Panel LC320WUG (SC)(A1)), LG 32LD555 ZC (Panel LC320WUG (SC)(A1)), LG 26LD355-ZA (Panel T260XW04 V.3), LG 37LD425 ZA (Panel T370HW03 V.B), LG 32LD425 (Panel LC320WUG (SC)(A1)), LG 32LD340 32LD340-ZA.BRUWLJU (Panel LC320WXE (SC)(A1)).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the EAX61124202 / 2-3PAGC10011B-R module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the HS01G 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 42LD420:
Installed matrix (LCD panel) LC420WUG (SC) (A1).
To power the backlight, a converter is used, combined with the power supply, controlled by the BD9270F PWM controller.
The necessary supply voltages for all nodes of the LG 42LD420 TV are generated by the EAX61124202 power module or its analogs using STR-W6053N, HS01G (PFC) microcircuits and 10NM60N type power switches.
MainBoard - the main board (motherboard) is an EAX61354204 module using CPU chips: LGE107DC-RP, DDR: H5TQ1G63BFR-H9C, Nand: HY27UF082G2B, SPI FLASH MX25L8005M2I and others.
The TDTJ-S001D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC420WUG-SCA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1450: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + FRC), CIE1931 72%
Response Time: 8/10 (Tr / Td)
Frequency: 60Hz
Lamp Type: 16 pcs EEFL Without Driver
Signal Interface: Mini LVDS, 60 pins
Voltage: 12.0V