Technical description and composition of the LG 32LS3400 TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 32LS3400 ZC
Chassis / Version: LD21C
Panel: LC320DXN (SE) (R2)
LED driver (backlight): PPW-LE32RG-0 REV0.8 - 6917L-0094C
PWM LED driver: BD9285F
MOSFET LED driver: SF5A600HD, FDD390N15A
Power Supply (PSU): LGP32F-12P - EAX64560501 - EAY62770401
PWM Power: ICE3BR4765JZ (Standby DIP-7), SC1S311
MainBoard: EAX64664903 - EBR75149851
IC MainBoard: LGE2111A-T8, K4B1G1646G-BCKO, STA3808 WE, AS324M, 25080 BVSIG, TJ3940, LCX244, Z105NP, AP7173
Tuner: TDSS-G101C EBL61060001
Control: IR: EBR74986702, Remote: AKB73655802
Specifications 32LS3400
LG 32LS3400
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 - EAX64560501 - EAY62770401 is faulty and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of standby power. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the rectifier bridge of the mains voltage and the power key (s) of the converter. The complete inoperability of the power supply unit can be caused by a short circuit in the power elements in the primary circuit, followed by an open fuse, or a short circuit in the loads.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself for no reason, which should be sought by checking other elements of the primary circuit - electrolytic capacitors, PWM controller ICE3BR4765JZ, SC1S311, which You can check only by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If the LG 32LS3400 does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the backlight circuits of the LC320DXN (SE) (R2) panel is likely. LEDs or their power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the backlight assembly.
The lack of backlight often occurs due to an open circuit in the LED circuit. There is a need for disassembling the panel and checking the LEDs themselves, as well as the same contact connections in the connectors and rations of the terminals.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V for them. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
Board repair and replacement of LGE2111A-T8, K4B1G1646G-BCKO, STA3808 WE, AS324M, 25080 BVSIG, TJ3940, LCX244, Z105NP, AP7173 microcircuits are carried out 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 the TV works normally from external devices, but does not tune into television channels, the TDSS-G101C EBL61060001 tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.One of the typical LG 32LS3400 ZC malfunctions often occurs in the LG panel LC320DXN (SE) (R2).
External manifestations: there is no image, the backlight does not work. In most such cases, the LEDs turn out to be malfunctioning, which, when tested, turn out to be either open 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
SCHEMATIC MANUAL --------------> LG CHASSIS: LD21C MODEL: 32LS3400/340S/340T/3450, 32LS3400/340S/340T/3450-ZC.
PSU SCHEMATIC --------------------> LGP32F-12P EAY62770401 EAX64560501 Power supply
EAX64664903
EAX64664903 can be used in TVs:
LG 32CS460T (Panel LC320WXN (SC)(A4)), LG 42LS3400 (Panel LC420DUN (SE)(R2)), LG 32LS3400 ZC (Panel LC320DXN (SE)(R2)), LG 32LS3500 (Panel LC320EXN (SE)(A2)), LG 32CS466 (Panel LC320WXN (SC)(A4)), LG 32LS3590 32LS3590-ZC.BRUDLJU (Panel T320XVN01.1), LG 32LS359T (Panel LC320EXN (SE)(A2)), LG 42CS460T 42CS460T-ZA (Panel LC420WUE (SC)(A3)).
The appearance of the power supply
Main features of the device LG 32LS3400:
Installed matrix (LED-panel) LC320DXN (SE) (R2).
To power the backlight LEDs, the PPW-LE32RG-0 LED driver is used, controlled by the BD9285F PWM controller. As the power elements of the LED driver, keys of the type SF5A600HD, FDD390N15A are used.
The necessary supply voltages for all nodes of the LG 32LS3400 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 EAX64664903 module using LGE2111A-T8, K4B1G1646G-BCKO, STA3808 WE, AS324M, 25080 BVSIG, TJ3940, LCX244, Z105NP, AP7173 and other chips.
Tuner TDSS-G101C EBL61060001 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC320DXN-SER2
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 (3H)
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
