Technical description and composition of the LG 32LC51 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LC51 ZA
Chassis / Version: LP78A
Panel: LC320WX6 (SL) (A3)
T-CON: ICE3B1565J (Stb), U3037M, 5501A
Inverter (backlight): integrated into PSU
PWM Inverter: OZ9925GN
Power Supply (PSU): EAY38639701 LGLP32SLPV2
MOSFET Power: SD20N60
MainBoard: EAX32572506 (0)
IC MainBoard: ANX9021, TPA3107D2, STMAV340, VCT7993P, AMTEL7044C32AN, TEA6420, MP2355DN
Tuner: TAFT-W005D
Specifications 32LC51
LG 32LC51
General recommendations for repairing TV LCD
Possible malfunctions
- LG 32LC51 does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Most likely in this case, the main switching power supply (IIP) LGLP32SLPV2 is faulty. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (SD20N60) and rectifier diodes for a probable short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the EAX32572506 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). When repairing an MB board, you need to check its components ANX9021, TPA3107D2, STMAV340, VCT7993P, AMTEL7044C32AN, TEA6420, MP2355DN. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
Before changing the TAFT-W005D tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Attention TV owners! Attempts at self-repair of LG 32LC51 are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual and schematic diagram LG 32LC51 Chassis LP78A
FOR MODELS 32LC7R, 32LC7R-ZA, 32LC51, 32LC51-ZA, 32LC52, 32LC52-ZC, 32LC54, 32LC54-ZD
The appearance of the MainBoard EAX32572506 is shown in the figure below:EAX32572506
EAX32572506 can be used in TVs:
LG 32LC43-ZE (Panel LC320WX6 SL A3), LG 32LC7RC TA (Panel LC320WX6 (SL)(A3)), LG 32LC41 (Panel LC320WX4 (SL)(D2)), LG 37LC41 ZA (Panel LC370WX4-SLA1).
The appearance of the power supply
Main features of the device LG 32LC51:
Installed matrix (LCD panel) LC320WX6 (SL) (A3).
The matrix control uses the Timing Controller (T-CON) ICE3B1565J.
To power the backlight, a converter is used, combined with a power supply, controlled by the OZ9925GN PWM controller.
The formation of the necessary supply voltages for all nodes of the LG 32LC51 TV is carried out by the EAY38639701 power module, or its analogs using power switches of the SD20N60 type.
MainBoard - the main board (motherboard) is an EAX32572506 module, using ANX9021, TPA3107D2, STMAV340, VCT7993P, AMTEL7044C32AN, TEA6420, MP2355DN, and others microcircuits.
The TAFT-W005D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320WX6-SLA3
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 8/10 (Tr / Td)
Frequency: 60Hz
Lamp Type: 14 pcs EEFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V