Technical description and composition of the LG 32LF580U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LF580U 32LF580U-ZA.ARUWLDU
Chassis / Version: LE46B / LD46B
Panel: NC320DXN VSBP5
T-CON: CPWBX5409TP ZD + K5387TP
LED driver (backlight): integrated into PSU; 110V
PWM LED driver: SSC1S311, A27RAW
MOSFET LED driver: STN4NF20L
Power Supply (PSU): LGP32-14PL1 EAX65391401 (3.0)
PWM Power: NCP1251, NR134S (Step-Down)
MOSFET Power: KP8N65, STD11N65M5
MainBoard: EAX65610905 (1.0)
IC MainBoard: EEPROM: 24C256, SOUND: Audio: NTP7513, D9PXV, D9PTK, 100GEA, TPA6138
Tuner: TDJM-G101D
Control: WIFI: TWFM-B006D EAT61813901
Specifications 32LF580U
LG 32LF580U
General repair guidelines for TV LCD LED
Possible malfunctions
- The LG 32LF580U TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
With such manifestations, in some cases, the LGP32-14PL1 power module is faulty. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches (KP8N65, STD11N65M5) and rectifier diodes for a possible partial or complete breakdown.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM chips NCP1251, NR134S (Step-Down) are usually checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
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. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX65610905 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). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard - EEPROM: 24C256, SOUND: Audio: NTP7513, D9PXV, D9PTK, 100GEA, TPA6138. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
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 voltages on the terminals of the TDJM-G101D 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.
Attention to users! Self-repair of the LG 32LF580U TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
FIRMWARE FOR EEPROM ----------------> LG 32LF580U 32LF580U-ZA.ARUWLDU LE46B / LD46B, Main: EAX65610905 (1.0), Panel: NC320DXN VSBP5
You can reduce the backlight current in LG TVs with LGP32-14PL1 power supplies (EAX65391401) as follows. The current sensor consists of six parallel-connected resistors R816-R821 - 1 Ohm, 1 Ohm, 1 Ohm, 1 Ohm, 2 Ohm, 8.2 Ohm. The total resistance in this case will be 0.22 Ohm. If you remove one resistor 1 Ohm, the total resistance increases to 0.28 Ohm, the current decreases proportionally from 250 mA to about 190 mA.
More details on this page
The appearance of the MainBoard EAX65610905 is shown in the figure below:EAX65610905
EAX65610905 can be used in TVs:
LG 47LB580V (Panel LC470DUE (FG)(A4)), LG 42LB572V (Panel LC420DUE (FG)(A4)), LG 32LF580U 32LF580U-ZA.ARUWLDU (Panel NC320DXN VSBP5), LG 32LB572U (Panel NC320DXN VSBP2).
The appearance of the power supply
Main features of the device LG 32LF580U:
Installed matrix (LED-panel) NC320DXN VSBP5.
The matrix control uses the Timing Controller (T-CON) CPWBX5409TP.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by a PWM controller SSC1S311, A27RAW. As power elements of the LED driver, keys of the STN4NF20L type are used.
The necessary supply voltages for all nodes of the LG 32LF580U TV are generated by the LGP32-14PL1 power module, or its analogs using NCP1251, NR134S (Step-Down) microcircuits and power switches of the KP8N65, STD11N65M5 type.
MainBoard - the main board (motherboard) is an EAX65610905 module, using EEPROM chips: 24C256, SOUND: Audio: NTP7513, D9PXV, D9PTK, 100GEA, TPA6138 and others.
The TDJM-G101D tuner provides television reception and channel tuning.