Technical description and composition of the LG 32LF5800 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LF5800
Chassis / Version: LD46H
Panel: HC320DUN-ABKS3-5122
LED backlight: 6916L-2223A, 6916L-2224A
LED driver (backlight): integrated into PSU
PWM LED driver: SSC1S311
MOSFET LED driver: STD11N65M5, STN4NF20L
Power Supply (PSU): LGP32-14PL1 EAX65391401 (3.0)
PWM Power: NCP1251 (PWM SOT23-6 5A2R ..), NR134S
MOSFET Power: KP8N65, STD11N65M5
MainBoard: EAX65610905 (1.0)
IC MainBoard: 24C256, NTP7513, D9PXV, D9PTK, 100GEA, TPA6138
Tuner: TDJM-G101D
Specifications 32LF5800
LG 32LF5800
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 32LF5800 does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
In such cases, the LGP32-14PL1 power supply is usually faulty. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches (KP8N65, STD11N65M5) and the rectifier diodes of the converters for a short circuit probability.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse 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 (PWM SOT23-6 5A2R ..), NR134S are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. The reason can be both in the power of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To check the LED strips, to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED transitions in forward bias, you can sometimes detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
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). Board repair and replacement of 24C256, NTP7513, D9PXV, D9PTK, 100GEA, TPA6138 microcircuits are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
If the TV works normally from external devices, but does not tune into television channels, the TDJM-G101D may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Attention TV owners! Self-repair attempts by LG 32LF5800 are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual and schematic diagram -------------> LG 32LF5800 Chassis LD46H
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 32LF5800:
Installed matrix (LED panel) HC320DUN-ABKS3-5122.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the PWM controller SSC1S311. As power elements of the LED driver, keys of the type STD11N65M5, STN4NF20L are used.
The necessary supply voltages for all nodes of the LG 32LF5800 TV are generated by the LGP32-14PL1 power supply module or its analogs using NCP1251 microcircuits (PWM SOT23-6 5A2R ..), NR134S and power switches of the KP8N65, STD11N65M5 type.
MainBoard - the main board (motherboard) is an EAX65610905 module, using 24C256, NTP7513, D9PXV, D9PTK, 100GEA, TPA6138 chips, and others.
The TDJM-G101D tuner provides television reception and channel tuning.