Technical description and composition of the LG 32LC7RC TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LC7RC TA
Chassis / Version: LP78A
Panel: LC320WX6 (SL) (A3)
T-CON: LC320W01-SLB1-C31 P / N: 6970C-0320A; R8A01028FP
Inverter (backlight): with integrated PSU
Power Supply (PSU): EAX37617601 LGLIPS32V2
PWM Power: FA5501A (PFC), ICE3B1565J, U3037M, FAN7382, MSC1601AI, A393F
MOSFET Power: SD20N60
MainBoard: EAX32572506 (0)
IC MainBoard: ANX9021, TPA3107D2, STMAV340, VCT7993P, AMTEL7044C32AN, TEA6420, MP2355DN
Tuner: TAFT-Z003D
Control: MKJ32022830
Appearance
LG 32LC7RC
General recommendations for repairing TV LCD
Repair of the TV LG 32LC7RC TA should begin with the diagnosis of a malfunction, which involves a careful inspection of the external and internal elements of the device. Based on visible external changes in the state of the components, it is often possible to determine the direction of the troubleshooting before making the necessary measurements. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
Sometimes the LG 32LC7RC TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the EAX37617601 LGLIPS32V2 common power supply module. If it is working properly, you must check the standby batteries on the Main Board. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the power key (s) SD20N60 is detected, which can be integrated with a PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If the LG 32LC7RC TV does not have an image, but there is sound, make sure that the backlight power converter (inverter) is working properly. It is also necessary to check the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for excessive ESR. When disabling protection in order to enable the diagnosis of a malfunction, special care should be taken, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
On the EAX32572506 (0) motherboard, in case of a malfunction, you should first check the performance of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - ANX9021, TPA3107D2, STMAV340, VCT7993P, AMTEL7044C32AN, TEA6420, MP2355DN and replace the failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Before changing the TAFT-Z003D 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 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 32LC7RC TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual and schematic diagram LG 32LC7R, 32LC7R-TA 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).
Main features of the device LG 32LC7RC:
Installed matrix (LCD panel) LC320WX6 (SL) (A3).
The matrix control uses the Timing Controller (T-CON) LC320W01-SLB1-C31.
To power the backlight, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 32LC7RC TV are generated by the EAX37617601 power supply module or its analogs using the FA5501A (PFC), ICE3B1565J, U3037M, FAN7382, MSC1601AI, A393F microchips and 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-Z003D tuner provides television 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
