Technical description and composition of the LG 32LB565U TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LB565U ZQ
Chassis / Version: LC43B
Panel: LC320DXE (FG) (A3)
LED driver (backlight): integrated into PSU; 117V, 250mA
PWM LED driver: SSC1S311, A27RAE (sot23-6)
MOSFET LED driver: STD11N65M5, MDHT4N20Y
Power Supply (PSU): LGP32-14PL1 - EAX65391401 EAY63071804
PWM Power: NCP1251, NR134S (Step-Down)
MOSFET Power: KP8N65
MainBoard: EAX65388005 EBU62356106
IC MainBoard: LGE2132, H27U1G8F2, MX25L8006E
Tuner: TDJM-G101D
Control: IR: EBR78925201
Specifications 32LB565U
LG 32LB565U
General repair guidelines for TV LCD LED
In the absence of any signs of operability, when the LG 32LB565U does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the power module LGP32-14PL1 - EAX65391404 (2.6) EAY63071804 of the TV. 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 diodes of the rectifier bridge 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. KP8N65 variants are possible.
If the power keys of the pulse converter are not equal, you should pay attention to other elements in their bundling, which may be the result or cause of their breakdown.
If the LG 32LB565U does not have an image, but there is sound, a malfunction of the backlight LEDs of the NC320DXN panel or their power converter - LED driver may occur.
To check the health of the LEDs and contact connections in their power circuit, the panel must be disassembled.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
Repair of the EAX65388005 (1.0) motherboard should begin with the diagnosis and verification of all linear stabilizers and power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its CPU chips: LGE2132; H27U1G8F2 and other possible malfunctioning components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before replacing the TDJM-G101D tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
For owners of the 32LB565U TV, 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 failures of the LG 32LB565U ZQ often occurs in the LG panel LC320DXE (FG) (A3).
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%.
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
Service manual and schematic diagram --------> CHASSIS : LD43B/LD44B MODEL : 42LB56** 42LB56**-Z*.
The appearance of the MainBoard EAX65388005 is shown in the figure below:EAX65388005
EAX65388005 can be used in TVs:
LG 32LB561U (Panel NC320DXN VSBP1), LG 42LB563V (Panel LC420DUE (FG)(A3)), LG 32LB565U ZQ (Panel LC320DXE (FG)(A3)), LG 42LB561V ZE (Panel LC420DUE (FG)(A3)), LG 49LB552V ZA (Panel LC490DUE (FG)(A6) ), LG 42LB565V (Panel LC420DUE (FG)(A3)), LG 32LB628U 32LB628U-ZB.BRUWLDU (Panel LC320DXE (FG)(P2)), LG 47LB561V-ZE 47LB561V (Panel LC470DUE( FG)(A3)).
The appearance of the power supply
Main features of the device LG 32LB565U:
Installed matrix (LED-panel) LC320DXE (FG) (A3).
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by a PWM controller SSC1S311, A27RAE (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 32LB565U TV are generated by the LGP32-14PL1 power supply module or its analogs using NCP1251, NR134S (Step-Down) microcircuits and KP8N65 type power switches.
MainBoard - the main board (motherboard) is an EAX65388005 module, using LGE2132, H27U1G8F2, MX25L8006E and other chips.
The TDJM-G101D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320DXE-FGA3
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 7 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V