Technical description and composition of the LG 32LM340T TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LM340T
Chassis / Version: LD21C
Panel: LC320DXN (SE) (U3)
T-CON: LC320EXN 6870C-0370A
LED driver (backlight): 6917L-0094C PPW-LE32RG-O (C) REV0.8
PWM LED driver: BD9285F
MOSFET LED driver: FDD390N15A
Power Supply (PSU): LGP32F-12P - EAX64560501 (1.7) REV1.1
PWM Power: ICE3BR4765JZ (Standby DIP-7), SC1S311
MainBoard: EAX64317404 (1.0) EBR75149858
IC MainBoard: CPU: LGE2111A-T8, Nand: H27U1G8F2BTR, DDR: K4B1G1646G-BCK0, Spi: MX25L8006E
Tuner: TDSN-G301D
Control: IR: EBR74986702 LM35-55 Ver 2.2
Specifications 32LM340T
LG 32LM340T
General repair guidelines for TV LCD LED
If the TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when turned on, there is a certain chance that the LGP32F-12P power module is faulty - EAX64560501 (1.7) REV1.1 and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of standby power. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
A breakdown of the power switch of the pulse converter is often triggered by other elements, for example, in the stabilization or control circuits of this switch, as well as by the damper elements in its drain and TPI winding.
If the LG 32LM340T has no image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the LC320DXN (SE) (U3) panel, or their power converter - LED driver. Sometimes, when turned on, the image appears and immediately disappears. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the backlight unit.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can test each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
Diagnosis and repair of the EAX64317404 (1.0) EBR75149858 motherboard usually begins with a test of the performance of the stabilizers and power converters of the module chips. In some cases, a software update is required.
Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU elements: LGE2111A-T8, Nand: H27U1G8F2BTR, DDR: K4B1G1646G-BCK0, Spi: MX25L8006E requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can be diagnosed by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the TDSN-G301D tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
For owners of 32LM340T TVs, we recommend that you contact qualified personnel 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 32LM340T often occurs in the LG panel LC320DXN (SE) (U3).
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
LG_CHASSIS : LD21C, MODEL: 32LM3400/340S/340T, 32LM3400/340S/340T-ZA SERVICE MANUAL
SCHEMATIC OF PSU ----------------> LGP32F-12P EAY62770401 EAX64560501 Power supply
The appearance of the MainBoard EAX64317404 is shown in the figure below:EAX64317404
EAX64317404 can be used in TVs:
LG 32LS560T (Panel LC320EUN (SE)(M2)), LG 42LS5600 (Panel T420HVN01.1), LG 47LM580T (Panel LC470EUE (SE)(U1)), LG 42LM3400 (Panel LC420DUN (SE)(U2)), LG 37LS560T (Panel LC370EUN (SE)(M2)), LG 32LM340T (Panel LC320DXN (SE)(U3)), LG 47LM615S (Panel LC470EUE (SE)(U1)), LG 32LM3400 32LM3400-ZA (Panel LC320DXN (SE)(U2)).
The appearance of the power supply
Main features of the device LG 32LM340T:
Installed matrix (LED-panel) LC320DXN (SE) (U3).
The matrix control uses the Timing Controller (T-CON) LC320EXN.
To power the backlight LEDs, the 6917L-0094C LED driver is used, controlled by the BD9285F PWM controller. As power elements of the LED driver, keys of the FDD390N15A type are used.
The necessary supply voltages for all nodes of the LG 32LM340T TV are generated by the LGP32F-12P power module or its analogs using ICE3BR4765JZ (Standby DIP-7), SC1S311 microcircuits.
MainBoard - the main board (motherboard) is an EAX64317404 module using CPU chips: LGE2111A-T8, Nand: H27U1G8F2BTR, DDR: K4B1G1646G-BCK0, Spi: MX25L8006E and others.
The TDSN-G301D tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320DXN-SEU3
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 1%), Hard coating (2H)
Brightness: 300 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V