Technical description and composition of the LG 32LW575S TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LW575S
Chassis / Version: LD12C
Panel: LC320EUD (SD) (P1)
LED backlight: 3660L-0373A 32 V6 Edge FHD R-Type / L-Type
T-CON: 6870C-0358A VER 1.0
LED driver (backlight): 6917L-0047A
Power Supply (PSU): EAX62865601 / 8 LGP3237-11SP
PWM Power: FAN7930B (PFC), L6599AI (PWM Resonant), ICE3BR4765JZ (Standby)
MOSFET Power: K10A60D
MainBoard: EAX64405501
IC MainBoard: CPU: LGE35230, Nand: TC58DVG3S0ETA, DDR: K4B2G1646C
Tuner: TDTR-T056F
Control: AKB73275612
Specifications 32LW575S
LG 32LW575S
General repair guidelines for TV LCD LED
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 32LW575S TV, as well as the external elements of the housing. Based on visible external changes in the state of the components, it is usually possible to determine the further direction of troubleshooting and localization of the defect before making the necessary measurements. In most cases, the repairman can guess the causes of the defect and possible consequences by the characteristic signs of typical TV defects, for example, ring cracks formed in the soldering of element leads, swollen rectifier filter capacitors, charred resistors and other circuit elements.
If LG does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a power module malfunction. 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 cut off, then it is necessary to check the rectifier bridge diodes 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.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If LG does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the backlight circuits of the LC320EUD panel is likely. The LEDs or the power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the LED driver, and check the LEDs, connecting obviously known good diagnostics.
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
On the EAX64405501 motherboard, in case of a malfunction, you should first check the operation of all the stabilizers or power converters of the microcircuits and, if necessary, update the software (software).
Before replacing the TDTR-T056F tuner, if there is no tuning to the channels, first check the supply voltage at its terminals.
Once again, remind users! Attempts to repair the LG TV yourself without the appropriate qualifications and experience can lead to its complete non-repairability!
SCHEMATIC MANUAL -----------------------> LG CHASSIS : LD12C 32LW570G/570S/575S/579S, 32LW570G/570S-ZD, 32LW575S-ZC, 32LW579S-ZE SERVICE MANUAL
SCHEMATIC MANUAL -----------------------> EAX62865601 rev1 LGP3237-11SPC1 Power Supply schematic diagram
The appearance of the MainBoard EAX64405501 is shown in the figure below:EAX64405501
EAX64405501 can be used in TVs:
LG 42LW575S (Panel LC420EUF (SP)(PX) L), LG 32LW575S (Panel LC320EUD (SD)(P1)), LG 47LW575S (Panel LC470EUF (SD)(P1)), LG 47LW650S 47LW650S-ZC (Panel LC470EUF (SD)(F1) ).
PSU Advanced
The EAX62865601 / 8 LGP3237-11SP power supply module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC node is a Step-Up Converter based on the FAN7930B PWM controller that evenly distributes high-frequency pulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device LG 32LW575S:
Installed matrix (LED-panel) LC320EUD (SD) (P1).
The matrix control uses the Timing Controller (T-CON) 6870C-0358A.
The LED driver 6917L-0047A is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the LG 32LW575S TV are generated by the EAX62865601 power module or its analogs using FAN7930B (PFC), L6599AI (PWM Resonant), ICE3BR4765JZ (Standby) microcircuits and power switches of the K10A60D type.
MainBoard - the main board (motherboard) is an EAX64405501 module using CPU chips: LGE35230, Nand: TC58DVG3S0ETA, DDR: K4B2G1646C and others.
The TDTR-T056F tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320EUD-SDP1
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 10%), Hard coating (2H)
Brightness: 350 cd / m²
Contrast Ratio: 1600: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering)
Response Time: 5 (G to G); 8 (MPRT)
Frequency: 120Hz + 120Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (4 ch, 8/10-bit), 92 pins
Voltage: 12.0V