Technical description and composition of the LG 42LS5600 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LS5600
Chassis / Version: LD21B
Panel: T420HVN01.1
LED backlight: 42INCH 7030PKG 64EA REV0.2 78312_20111125; cool: 74.42T23.001-2-DS
LED driver (backlight): 4H + V3416.001_A2
PWM LED driver: DF3421
MOSFET LED driver: PA610AD
Power Supply (PSU): EAX64427001 LGP42L-12P EAY62608801
PWM Power: FAN7930BMX (PFC), ICE3BR4765JZ (Standby), L6599AD
MOSFET Power: STD10NM60N (PFC), STD7NM60N
MainBoard: EAX64317404 (1.0)
IC MainBoard: CPU: LGE2111A-T8, Nand: H27U1G8F2BTR, DDR: K4B1G1646G-BCK0, Spi: MX25L8006E
Tuner: TDSN-G301D
Control: AKB73655802, IR: EBR74986702 LM35-55
Specifications 42LS5600
LG 42LS5600
General repair guidelines for TV LCD LED
LG 42LS5600, like other televisions, it is advisable to start repairing with a careful inspection of external and internal elements and modules. 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. 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 LGP42L-12P power supply module fails, the external manifestations may be different, for example, the LG 42LS5600 does not turn on at all and there is no indication of the indicator lights on the front panel. With the same symptoms, the stabilizer (converter) of the power supply to the control processor may be faulty. 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 transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
In cases where the LG 42LS5600 TV has lost its image, and the sound is there and all other functions are operational, there is a possibility of a malfunction of the LED driver (a converter for powering the T420HVN01.1 backlight LEDs). When you turn on the TV, the image may appear briefly and disappear immediately. It must be borne in mind that with such manifestations the LEDs themselves also fail.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the rations of their terminals, as well as the reliability of the connections in the connectors and rations of the terminals.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes.
Repair of the EAX64317404 (1.0) motherboard should begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU elements: LGE2111A-T8, Nand: H27U1G8F2BTR, DDR: K4B1G1646G-BCK0, Spi: MX25L8006E requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can be diagnosed by warming up.
Before changing the TDSN-G301D tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured on the corresponding tuner pins.
Attention to users! Self-repair of the LG 42LS5600 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC DIAGRAM ----------> LG CHASSIS: LD21B MODEL: 42LS5600, 47LS5600 SERVICE MANUAL.
PSU SCHEMATIC DIAGRAM ----------> LGP42L-12P EAX64427001 EAY62608801
The appearance of the MainBoard EAX64317404 is shown in the figure below:EAX64317404
EAX64317404 can be used in TVs:
LG 32LS560T (Panel LC320EUN (SE)(M2)), LG 42LS5600 (Panel T420HVN01.1), LG 47LM580T (Panel LC470EUE (SE)(U1)), LG 42LM3400 (Panel LC420DUN (SE)(U2)), LG 37LS560T (Panel LC370EUN (SE)(M2)), LG 32LM340T (Panel LC320DXN (SE)(U3)), LG 47LM615S (Panel LC470EUE (SE)(U1)), LG 32LM3400 32LM3400-ZA (Panel LC320DXN (SE)(U2)).
PSU Advanced
On the 42LS5600 TV, the EAX64427001 power module is installed using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The boost converter based on the FAN7930BMX PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes when the charge current determines its reactance (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the device LG 42LS5600:
The matrix (LED panel) T420HVN01.1 is installed.
The LED driver 4H + V3416.001_A2 is used to power the backlight LEDs, it is controlled by the PFM controller DF3421. As the power elements of the LED driver, keys of the type PA610AD are used.
The necessary supply voltages for all nodes of the LG 42LS5600 TV are generated by the EAX64427001 power module or its analogs using FAN7930BMX (PFC), ICE3BR4765JZ (Standby), L6599AD microcircuits and power switches of the STD10NM60N (PFC), STD7NM60N type.
MainBoard - the main board (motherboard) is an EAX64317404 module using CPU chips: LGE2111A-T8, Nand: H27U1G8F2BTR, DDR: K4B1G1646G-BCK0, Spi: MX25L8006E and others.
The TDSN-G301D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T420HVN01.1 CELL
Type: a-Si TFT-LCD, CELL
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.7% (with Polarizer)
Contrast Ratio: 3000
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V