Technical description and composition of the LG 42CS460T TV, panel type and applicable modules. The composition of the modules.LG
Model: 42CS460T 42CS460T-ZA
Chassis / Version: LC21C
Panel: LC420WUE (SC) (A3)
Inverter (backlight): integrated into PSU
PWM Inverter: BD9270F
Power Supply (PSU): EAX64648001 (1.6)
PWM Power: STRW6053N, HS01G (PFC)
MOSFET Power: 2SK3868, K10A60D
MainBoard: EAX64664903 (1.0) 12/11/12
IC MainBoard: CPU .: LGE2111A-T8, AUDIO: STA380B, DDRAM: 2IGI2, EEPROM: 24C256, SPI FLASH: 25Q80B
Tuner: TDSN-G301D EBL61080001
Specifications 42CS460T
LG 42CS460T
General recommendations for repairing TV LCD
Possible malfunctions
- LG 42CS460T does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
In some of these cases, the main switching power supply, the EAX64648001 module, is faulty. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches (2SK3868, K10A60D) and rectifier diodes of the converters for possible short circuit.
In case of breakdowns of semiconductors in secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) STRW6053N, HS01G (PFC), if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the EAX64910001 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace 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 CPU elements .: LGE2111A-T8, AUDIO: STA380B, DDRAM: 2IGI2 x2, EEPROM: 4HA7 = 24C256, SPI FLASH: 25Q80B. BGA chip malfunctions are usually easy to detect by warming up.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the TDSN-G301D EBL61080001 tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Owners and users of the LG 42CS460T TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Schematic diagram ------------> LG CHASSIS LD21C 42CS460/460S/460T, 42CS460/460S/460T-ZA SERVICE MANUAL.
MODS: 42CS460, 42CS460S, 42CS460T, 42CS460, 42CS460S, 42CS460T-ZA
The appearance of the MainBoard EAX64664903 is shown in the figure below:EAX64664903
EAX64664903 can be used in TVs:
LG 32CS460T (Panel LC320WXN (SC)(A4)), LG 42LS3400 (Panel LC420DUN (SE)(R2)), LG 32LS3400 ZC (Panel LC320DXN (SE)(R2)), LG 32LS3500 (Panel LC320EXN (SE)(A2)), LG 32CS466 (Panel LC320WXN (SC)(A4)), LG 32LS3590 32LS3590-ZC.BRUDLJU (Panel T320XVN01.1), LG 32LS359T (Panel LC320EXN (SE)(A2)), LG 42CS460T 42CS460T-ZA (Panel LC420WUE (SC)(A3)).
The appearance of the power supply
Main features of the device LG 42CS460T:
Installed matrix (LCD panel) LC420WUE (SC) (A3).
To power the backlight, a converter is used, combined with a power supply, controlled by a BD9270F PWM controller.
The necessary supply voltages for all nodes of the LG 42CS460T TV are generated by the EAX64648001 power supply module or its analogs using STRW6053N, HS01G (PFC) microchips and power switches of the 2SK3868, K10A60D type.
MainBoard - the main board (motherboard) is an EAX64664903 module using CPU chips: LGE2111A-T8, AUDIO: STA380B, DDRAM: 2IGI2, EEPROM: 24C256, SPI FLASH: 25Q80B and others.
The TDSN-G301D EBL61080001 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC420WUE-SCA3
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: 5 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs EEFL Embedded (Balance board)
Signal Interface: LVDS (2 ch, 8/10-bit), 51 pins
Voltage: 12.0V