Technical description and composition of the LG 32LB5610 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LB5610
Chassis / Version: LD44B / LC43B
Panel: LC320DUE (VG) (M1) VD5
LED backlight: A-TYPE 6920L-0443A, B-TYPE 6920L-0444A
LED driver (backlight): integrated into PSU
PWM LED driver: SSC1S311, A27RAW (sot-26)
MOSFET LED driver: STD11N65M5, MDHT4N20Y
Power Supply (PSU): LGP32-14PL1 EAX65391401 (2.8)
PWM Power: NCP1251 (PWM SOT23-6 5A2R ..), NR134S (Step-Down)
MOSFET Power: KP8N65
MainBoard: EAX65361503 (1.0)
IC MainBoard: LGE2132, MX25L8006E, 24C256
Tuner: TDJH-G101D
Specifications 32LB5610
LG 32LB5610
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 32LB5610 does not turn on, does not respond to buttons and remote control, indicators on the front panel do not light up and do not blink.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module LGP32-14PL1. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of the power switches (KP8N65) and rectifier diodes for possible breakdown (short circuit).
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.
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) NCP1251 (PWM SOT23-6 5A2R ..), NR134S (Step-Down), if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
The faulty usually in these cases is the backlight matrix (LED-panel). Often the cause is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver is malfunctioning.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. 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 EAX65361503 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 LGE2132, MX25L8006E, 24C256 microcircuits are carried out in the presence of 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 TDJH-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.
TV users and owners need to remember that attempts to self-repair an LG 32LB5610 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Service manual and schematic diagram -------------------------> LG 32LB5610 Chassis LC43B.
You can reduce the backlight current in LG TVs with LGP32-14PL1 power supplies (EAX65391401) as follows. The current sensor consists of six resistors R816-R821 connected in parallel - 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 EAX65361503 is shown in the figure below:EAX65361503
The appearance of the power supply
Main features of the device LG 32LB5610:
Installed matrix (LED-panel) LC320DUE (VG) (M1) VD5.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by a PWM controller SSC1S311, A27RAW (sot-26). As the power elements of the LED driver, keys of the type STD11N65M5, MDHT4N20Y are used.
The necessary supply voltages for all nodes of the LG 32LB5610 TV are generated by the LGP32-14PL1 power supply module or its analogs using NCP1251 (PWM SOT23-6 5A2R ..), NR134S (Step-Down) microcircuits and KP8N65 type power switches.
MainBoard - the main board (motherboard) is an EAX65361503 module, using LGE2132, MX25L8006E, 24C256 chips, and others.
The TDJH-G101D tuner provides TV reception and channel tuning.