Technical description and composition of the LG 32LC41 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LC41
Chassis / Version: LP78A
Panel: LC320WX4 (SL) (D2)
T-CON: 6870C-0114B (2L) LC320WX4-SLA1
Inverter (backlight): integrated into PSU
Power Supply (PSU): EAX32268501 -9 PLHL-T602A EAY34795001
MainBoard: EAX32572506 (0) EBR36475001005 EBR35513001022
IC MainBoard: ANX9021, TPA3107D2, STMAV340, VCT7993P, AMTEL7044C32AN, TEA6420, MP2355DN
Tuner: EBL35311207 TAFT-W005D
Control: IR: EAX32947801 (3), Remote: MKJ39170805
Specifications 32LC41
LG 32LC41
General recommendations for repairing TV LCD
Possible manifestations of defects
- LG 32LC41 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.
In some of these cases, a malfunction is detected in the EAX32268501 power module. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often 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 responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
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). In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips ANX9021, TPA3107D2, STMAV340, VCT7993P, AMTEL7044C32AN, TEA6420, MP2355DN and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before changing the tuner EBL35311207 TAFT-W005D, if it is not possible to tune to television channels, make sure that there are supply voltages that need to be measured on the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, remind users! Attempts to self-repair the LG 32LC41 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Service manual and schematic diagram --------> LG 32LC41-4R, 32LC42, 32LC43, 32LC44 SM Chassis LP78A
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 32LC41:
Installed matrix (LCD panel) LC320WX4 (SL) (D2).
The matrix control uses the Timing Controller (T-CON) 6870C-0114B.
To power the backlight, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the LG 32LC41 TV is carried out by the EAX32268501 power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX32572506 module, using ANX9021, TPA3107D2, STMAV340, VCT7993P, AMTEL7044C32AN, TEA6420, MP2355DN, and others microcircuits.
Tuner EBL35311207 TAFT-W005D provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320WX4-SLD2
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, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 8/10 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 18 pcs EEFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 34 pins
Voltage: 12.0V