Technical description and composition of the LG 32LS345T TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LS345T
Chassis / Version: LD21C / LC21B
Panel: 331537561 KENMOS 1365X768
LED backlight: LG lnnotek 32 NDE Rev 0.4
T-CON: LC320EXN-SEA1-K31 P / N: 6870C-0414A
LED driver (backlight): integrated into PSU
PWM LED driver: MAP3202SIRH
MOSFET LED driver: FDT86106
Power Supply (PSU): EAY62809401 LGP32P-12LPB
PWM Power: SSC1S311A, L4971
MOSFET Power: MDF10N65
MainBoard: EAX64910001 (1.0)
IC MainBoard: CPU .: LGE2111A-T8, AUDIO: STA380B, DDRAM: 2IGI2 x2, EEPROM: 4HA7 = 24C256, SPI FLASH: 25Q80B
Tuner: TDSN-G301D EBL61080001
Control: Remote: AKB73655861
Specifications 32LS345T
LG 32LS345T
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 32LS345T TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Most likely in this case, the main switching power supply (MPS) EAY62809401 is faulty. It is necessary to measure its output voltages and, if they are absent, check the serviceability of power switches (MDF10N65) and rectifier diodes in the converters for possible breakdown.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode, or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers SSC1S311A, L4971, in the absence of visible damage or frank fault between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
The most likely in these cases is a malfunction of the LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX64910001 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 CPU chips .: LGE2111A-T8, AUDIO: STA380B, DDRAM: 2IGI2 x2, EEPROM: 4HA7 = 24C256, SPI FLASH: 25Q80B are made 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 you suspect a malfunction of the TDSN-G301D EBL61080001 tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary power supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Attention TV owners! Self-repair attempts by LG 32LS345T are not recommended by the manufacturer and can lead to serious negative consequences!
LGP32P-12LPB EAY62809401 Power supply SCHEMATIC
The appearance of the MainBoard EAX64910001 is shown in the figure below:EAX64910001
EAX64910001 can be used in TVs:
LG 32LS340T (Panel LC320DXN), LG 32LS3510-ZB (Panel LC320EXN SEA2), LG 42CS460 (Panel LC420WUE (SC)(A3)), LG 32LS350T ZA (Panel T320XVN01.1), LG 42LS345T (Panel HC420DUN-SLCP1 11XX), LG 32CS465 ZA (Panel LC320WXN (SC)(A4)), LG 32LS345T (Panel 331537561 KENMOS 1365X768).
The appearance of the power supply
Main features of the device LG 32LS345T:
Installed matrix (LED-panel) 331537561 KENMOS 1365X768.
The matrix control uses the Timing Controller (T-CON) LC320EXN-SEA1-K31.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the MAP3202SIRH PWM controller. As the power elements of the LED driver, keys of the FDT86106 type are used.
The necessary supply voltages for all nodes of the LG 32LS345T TV are generated by the EAY62809401 power supply module or its analogs using SSC1S311A, L4971 microcircuits and MDF10N65 type power switches.
MainBoard - the main board (motherboard) is an EAX64910001 module, using CPU chips: LGE2111A-T8, AUDIO: STA380B, DDRAM: 2IGI2 x2, EEPROM: 4HA7 = 24C256, SPI FLASH: 25Q80B and others.
The TDSN-G301D EBL61080001 tuner provides TV reception and channel tuning.