Technical description and composition of the LG 32LB561V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LB561V
Chassis / Version: LC43B
Panel: LC320DUE (FG) (A3)
LED backlight: 6916L-1703A & 6916L-1704A
T-CON: 6870C-0488A
LED driver (backlight): integrated into PSU; 117V, 250mA
PWM LED driver: SSC1S311, A27RAY (sot23-6)
MOSFET LED driver: STD11N65M5, MDHT4N20Y
Power Supply (PSU): LGP32-14PL1 EAX65391401 (2.7)
PWM Power: NCP1251 (PWM SOT23-6 5A2R ..), NR134S (Step-Down)
MOSFET Power: KP8N65
MainBoard: EAX65388006 (1.0)
IC MainBoard: CPU: LGE2132; SPI Flash: MX25L8005; SOUND: TAS5733
Tuner: TDJM-G101D
Control: Remote: AKB73715679, IR: EBR78925201
Specifications 32LB561V
LG 32LB561V
General repair guidelines for TV LCD LED
TV LG 32LB561V, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. It often happens that visible damage to elements or connections helps determine the direction of the troubleshooting. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a significant clue in the assumptions about the causes and consequences of the malfunction.
If the LG 32LB561V does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the EAX65391401 (2.7) LGP32-14PL1 power supply module. In some cases, only the processor power regulator may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
Power switches in pulsed power supplies (SMPS) fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the SC1S311, 5A2RAD PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
In cases where the LG 32LB561V TV has lost an image, but the sound is there and all other functions are operational, there is a possibility of a malfunction of the LED driver (converter for powering the backlight LEDs of the LC320DUE panel). 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.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the health of the transitions of the LEDs, as well as the reliability of the contact connections in the lines and connectors.
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.
The motherboard EAX65388006 (1.0) must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
When repairing an MB board, you need to check its CPU components: LGE2132; SPI Flash: MX25L8005; SOUND: TAS5733. Defective items should be replaced. If BGA chips are installed, their malfunction is usually localized by heating.
Before changing the tuner TDJM-G101D, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured on the corresponding terminals of the tuner.
For owners of 32LB561V TVs, we recommend that you contact qualified professionals with experience to repair! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
One of the typical malfunctions of the LG 32LB561V often occurs in LG's LED panel LC320DUE.
External manifestations: there is no image, the backlight does not work. In most such cases, the LEDs turn out to be malfunctioning, which during testing turn out to be either in a cliff or with broken internal zener diodes.
LEDs must be replaced, and the maximum current from the driver should be limited to 10-20%.
More details on this page
Service manual and schematic diagram LG Chassis LC43B
Service manual and schematic diagram LG CHASSIS LB43T MODEL: 32LB561D/561T/563D/563TA typical defect is a malfunction of the backlight LEDs of the LC320DUE panel (matrix). A breakdown of the built-in zener diodes does not stop the inverter, therefore, when opening the panel, sometimes you can find more than a dozen LEDs in a breakdown state.
All LEDs are connected in series and the backlight works until the first break of the protective zener diode. Read more on replacing diodes and finalizing the inverter More details on this page
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.
The appearance of the MainBoard EAX65388006 is shown in the figure below:EAX65388006
EAX65388006 can be used in TVs:
LG 32LB561V (Panel LC320DUE), LG 32LB561U (Panel NC320DXN VSBP1), LG 42LB629V ZM (Panel LC420DUE (FG)(P2) ), LG 32LB563U (Panel NC320DXN VSBP1), LG 42LB552V ZA (Panel LC420DUE (FG)(A6)), LG 32LB552U (Panel NC320DXN-VSBP4), LG 32LB563V (Panel LC320DUE (FG)(A3)), LG 42LB561V ZE (Panel LC420DUE (FG)(A3)), LG 42LB569V 42LB569V-ZX.BRUWLDU (Panel LC420DUE (FG)(A3)).
The appearance of the power supply
Main features of the device LG 32LB561V:
Installed matrix (LED-panel) LC320DUE (FG) (A3).
The matrix control uses the Timing Controller (T-CON) 6870C-0488A.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by a PWM controller SSC1S311, A27RAY (sot23-6). 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 32LB561V 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 EAX65388006 module, using CPU chips: LGE2132; SPI Flash: MX25L8005; SOUND: TAS5733 and others.
The TDJM-G101D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320DUE-FGA3
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 698.4x392.85 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 65%
Response Time: 7 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V