Technical description and composition of the LG 32LD340 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LD340 32LD340-ZA.BRUWLJU
Chassis / Version: LD01B
Panel: LC320WXE (SC) (A1)
T-CON: 6870C-0313B
LED driver (backlight): integrated into PSU
PWM LED driver: BD9270F
Power Supply (PSU): EAX61124201 / 15 LGP32-10LH 3PAGC10011A-R
PWM Power: STR-W6053N, HS01G (PFC)
MOSFET Power: 13NM60N, 2SK3868
MainBoard: EAX61354204 (0) EBR65979099
IC MainBoard: SAA34907920 Ver.3.5.7, K4B1G1646E-HCH9, SAA35408803 Ver.3.03.12, 24C16WP, NTP-7100, MAX3232C
Tuner: TDTJ-S001D
Specifications 32LD340
LG 32LD340
General repair guidelines for TV LCD LED
Possible malfunctions
- LG 32LD340 does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Often in such cases, the EAX61124201 power module is faulty. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches (13NM60N, 2SK3868) and rectifier diodes of converters for possible short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
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 STR-W6053N, HS01G (PFC), 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, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the EAX61354204 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). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - SAA34907920 Ver.3.5.7, K4B1G1646E-HCH9, SAA35408803 Ver.3.03.12, 24C16WP, NTP-7100, MAX3232C with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If a TDTJ-S001D tuner is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and data exchange pulses with the processor via the I2C bus at the corresponding tuner pins.
Owners and users of the LG 32LD340 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual and schematic diagram ----------------> LG CHASSIS LD01B; MODEL: 32LD340, 32LD350, 32LD350C, 32LD350N, 32LD358 -ZA, 32LD341, 32LD351, 32LD359 -ZB.
FIRMWARE SPI FLASH, EEPROM -------------> LG 32LD340 32LD340-ZA LD01B, Main: EAX61354204, Panel: LC320WXE
The appearance of the MainBoard EAX61354204 is shown in the figure below:EAX61354204
EAX61354204 can be used in TVs:
LG 32LD345 (Panel LC320WXE-SCA1), LG 37LD450 (Panel LC370WUG (SC)(A1)), LG 42LD455-ZA (Panel LC420WUG), LG 32LD550 (Panel LK315D3LA57), LG 42LD450 ZA (Panel LC420WUG (SC)(A1)), LG LG32LD350 32LD350 (Panel T315HW04 V.8), LG 42LD420 ZA (Panel LC420WUG (SC)(A1)), LG 37LD420 ZA (Panel T370HW03 V.B), LG 32LD420 ZA (Panel LC320WUG (SC)(A1)), LG 32LD555 ZC (Panel LC320WUG (SC)(A1)), LG 26LD355-ZA (Panel T260XW04 V.3), LG 37LD425 ZA (Panel T370HW03 V.B), LG 32LD425 (Panel LC320WUG (SC)(A1)), LG 32LD340 32LD340-ZA.BRUWLJU (Panel LC320WXE (SC)(A1)).
The appearance of the power supply
Main features of the device LG 32LD340:
Installed matrix (LED-panel) LC320WXE (SC) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0313B.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the BD9270F PWM controller.
The necessary supply voltages for all nodes of the LG 32LD340 TV are generated by the EAX61124201 power supply module or its analogs using STR-W6053N, HS01G (PFC) microcircuits and power switches of the 13NM60N, 2SK3868 type.
MainBoard - the main board (motherboard) is an EAX61354204 module, using microchips SAA34907920 Ver.3.5.7, K4B1G1646E-HCH9, SAA35408803 Ver.3.03.12, 24C16WP, NTP-7100, MAX3232C and others.
The TDTJ-S001D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC320WXE-SCA1
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 10%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.0 (G to G)
Frequency: 60Hz
Lamp Type: 10 pcs EEFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
