Technical description and composition of the LG 32LC52 TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LC52
Chassis / Version: LP78A
Panel: LC320WX6 (SL) (A1)
Lamp backlight: 14 Lamp EEFL
T-CON: 6870C-0320A LC320W01-SLB1; R8A01028FP
Inverter (backlight): integrated into PSU
PWM Inverter: OZ9925GN
Power Supply (PSU): EAY38639701 LGLP32SLPV2
MOSFET Power: SD20N60
MainBoard: EAX32572506 (0) EBR36475001
IC MainBoard: ANX9021, TPA3107D2, STMAV340, VCT7993P, AMTEL7044C32AN, TEA6420, MP2355DN
Tuner: TAFT-W005D
Specifications 32LC52
LG 32LC52
General recommendations for repairing TV LCD
Possible manifestations of defects
- The LG 32LC52 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
In some of these cases, the main switching power supply, the EAY38639701 module, is faulty. 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 power switches (SD20N60) of converters and rectifier diodes for the presence of a possible 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits are usually checked by replacement 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.
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.
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 TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
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.
The malfunction of the TAFT-W005D tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
It should be remembered! Attempts to self-repair the LG 32LC52 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Service manual and schematic diagram -------------------> LG 32LC52 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 32LC52:
Installed matrix (LCD panel) LC320WX6 (SL) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0320A.
To power the backlight, a converter is used, combined with a power supply, controlled by the OZ9925GN PWM controller.
The necessary supply voltages for all nodes of the LG 32LC52 TV are generated 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-SLA1
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: 14 pcs EEFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V